Abstract: A light-emitting element mount (4) is fixed onto a base (8), and a semiconductor laser element (1) is fixed onto the light-emitting element mount (4). An anchor member (5), which is in the shape of a roughly rectangular plate, is fixed onto the base (8). An optical fiber (2) is fixed onto the anchor member (5) by means of an anchoring material (6). The optical fiber (2) is aligned and optically coupled with the semiconductor laser element (1). A cut-out (9) is formed in the part of the base (8) corresponding to the anchoring material (6) (below the anchoring material (6)). Thus the anchor member (5) is fixed onto the base (8) so as to straddle the cut-out (9). Since the cut-out (9) is formed below the anchor member (5), a spot heater (10) or like can be used to heat the anchor member (5) from the bottom surface thereof. Thus, the anchoring material (6) on top of the anchor member (5) can be efficiently heated.

Abstract: A broadband light source configured to emit a stable broadband optical beam is provided. The broadband light source includes at least one optical pump source, an optical system including a polarization beam combiner, and a solid state laser medium. The optical system is configured to receive at least one optical pump beam from a respective one of the at least one optical pump source. The solid state laser medium receives a substantially unpolarized pump beam from a first output of the optical system. Stable broadband amplified spontaneous emission is output from a second output of the optical system.

Abstract: An adapted semiconductor laser package that may convert a first type of package pin-out arrangement to a desired pin-out arrangement. The laser package may include a laser package including a laser, an isolator, a lens, a fiber sleeve, and a pin-out arrangement. The isolator and the fiber sleeve may be jointly arranged away from the laser. The laser package may also include an adapter with a first section with a plurality of holes geometrically arranged and mated with the package pin-out arrangement, a second section with an adapter pin-out arrangement with two rows of pins extending along opposite sides of the package, and electrical connections between the plurality of holes and the pins.

Abstract: A wavelength tunable filter and a wavelength tunable laser module are a codirectional coupler type whose characteristics do not vary significantly with a process error. They are structured so as to include a semiconductor substrate which has a first optical waveguide and a second optical waveguide. The first and the second optical waveguides are extended from a first side of the semiconductor substrate to an opposing second side thereof. The first optical waveguide includes a first core layer, which has a planar layout having periodic convexes and concaves, and a pair of electrodes, which vertically sandwich the first core layer. The second optical waveguide includes a second core layer, which has a lower refractive index than the first core layer. Further, a layer having the same composition and film thickness as the second core layer is placed under the first core layer.

Abstract: A pulsed light generator of the invention includes: an excitation light source; a fiber grating into which excitation light from the excitation light source enters; a rare-earth doped optical fiber optically coupled with the fiber grating, in which a rare-earth element is doped into a core, serving as an optical transmitting section; an optical switch including a deflection element for causing a Q-switching operation; a first optical fiber that causes light from the rare-earth doped optical fiber to enter into the optical switch; and a second optical fiber for waveguiding pulsed light output from the optical switch. One surface side of the optical switch, into which light enters, is subjected to anti-reflection treatment with a reflectance with respect to a wavelength of the pulsed light output from the optical switch being 0.1% or less.

Abstract: A beam alignment chamber extending in a length direction comprising a base having a front edge, and two side edges, first and second opposed side walls connected to the base, and extending along the length of the base, a front wall located at the front edge of the base having an output opening. The beam alignment chamber further comprises a plurality of arrays of light sources disposed to direct light beams through the first or second side walls, and a plurality of reflectors mounted on the base, each having independent yaw and pitch adjustments, each reflector being paired with a corresponding array of light sources, the base-mounted reflectors being disposed to direct the light beams along the length of the beam alignment chamber through the output opening forming an aligned two-dimensional array of parallel light beams.

Abstract: A wavelength conversion laser device includes a laser light source which emits a laser beam, two reflective surfaces which reflect therefrom a laser beam, a wavelength converter provided between the two reflective surfaces, which converts a laser beam into a wavelength-converted laser beam, and condensing optics which condense the laser beams to be injected between the two reflective surfaces, wherein at least one of the two reflective surfaces has a curvature for reflecting a laser beam to be re-injected into the wavelength converter between the two reflective surfaces repeatedly while forming multi paths of laser beams injected into the wavelength converter at different incident angles, and the condensing optics are arranged to disperse beam waists of the laser beams in the wavelength converter, which reciprocate between the two reflective surfaces.

Abstract: Method for generating a laser pulse for the fine machining of workpieces using a fiber laser, the laser fiber of which is optically pumped by use of at least one diode laser which is operated by a current pulse whose slew rate, pulse height, and pulse length are adjusted in adaptation to the laser fiber in such a way that the laser pulse (22) is initially composed of a primary relaxation pulse (A), independently of the pulse length of the current pulse.

Abstract: A decohered laser light production system is provided. The decohered laser light system comprises a laser source. The system further comprises a multi-mode fiber having an input face, an output face and a body for propagating light from the input face to the output face, the input face arranged to accept laser light from the laser source, the body comprising a length such that laser light is generally decohered when exiting the output face.

Abstract: A means for optically coupling a semiconductor laser to an optical fiber is disclosed. In one embodiment, a volume phase holographic element is disposed on a light-emitting surface of a semiconductor laser. The volume phase holographic element acts as an aberration-corrector for a lens that is disposed between the semiconductor laser and the optical fiber. In this way, an inexpensive lens that is not aberration free can be used. In some embodiments, the volume phase holographic element converts a Gaussian light beam emitted by the semiconductor laser into an annular beam that is more suitable for long distance transmission in multimode fibers.

Abstract: A laser beam source device includes: a light source which emits light having fundamental wavelength; a wavelength conversion element which converts the light having fundamental wavelength into light having conversion wavelength; a resonance element which transmits first light converted into the conversion wavelength light and reflects light not converted; an optical path conversion element which releases second light contained in the light reflected by the resonance element and converted into the conversion wavelength light in the same direction as the direction of the first light, and releases the light not converted toward the light source; and a supporting member. The resonance element is disposed in such a position that one end surface of the resonance element on the second light side is shifted to the supporting member from one end surface of the wavelength conversion element on the second light side.

Abstract: A ring-cavity or linear-cavity all-fiber-based ultra short pulse laser system and method of operating the same are provided. The all-fiber-based ultra short pulse laser system includes a pulse pump light source, a gain fiber, a first fiber signal pump combining unit, a broadband optical isolator, a fiber saturable absorber, an assistant light source, a second fiber signal pump combining unit, and a light coupling output. The first fiber signal pump combining unit is respectively connected to the pulse pump light source and the gain fiber to emit broadband amplified spontaneous emission, then the broadband amplified spontaneous emission passes through the broadband optical isolator. The second fiber signal pump combining unit is respectively connected to the assistant light source and the fiber saturable absorber. An ASE signal actively provides passive mode locking of the cavity, and the light coupling output partially outputs the laser. A dispersion fiber controls the temporal width.

Abstract: A light source unit includes: a light source part that supplies light; an optical element that changes an optical path of the light from the light source part; and a wavelength conversion element that converts a wavelength of the light from the optical element. The optical element is movable, and the optical path of the light entering the wavelength conversion element from the light source part is shifted by moving the optical element.

Abstract: A weapon system includes a weapon system illuminator laser system and one or more optical fibers. The weapon system illuminator laser system can produce one or more illuminator laser beams to illuminate at least one object outside the weapon system without destroying the object. The weapon system illuminator laser system is located at a first location within the weapon system. The object, or a second object associated with the object, is to be destroyed or damaged by energy. The one or more optical fibers are configured to transport the one or more illuminator laser beams from the first location to a second location within the weapon system. The one or more optical fibers can provide beam containment and beamwalk maintenance in the presence of mechanical or thermal disturbances. The one or more optical fibers and the weapon system illuminator laser system can withstand mechanical or thermal disturbances.

Abstract: A laser includes a regenerative ring resonator that includes a discharge chamber having electrodes and a gain medium between the electrodes for producing a laser beam; a partially-reflective optical coupler, and a beam modification optical system in the path of the laser beam. The beam modification optical system transversely expands a profile of the laser beam such that the near field laser beam profile uniformly fills each aperture within the laser and such that the regenerative ring resonator remains either conditionally stable or marginally unstable when operating the laser at powers that induce thermal lenses in optical elements inside the regenerative ring resonator.

Abstract: A system and a method for coupling multiple pump light beams to an active fiber. The system including an inverted conical disk, concave lens or glass wedge, an active fiber placed in a center of the inverted conical disk (or concave lens) or at a bottom facet of the glass wedge and a plurality of pump light sources. The system further includes a plurality of lenses for focusing pump light beams from pump light sources towards a side of the inverted conical disk, concave lens or glass wedge, wherein the inverted conical disk, concave lens or glass wedge, couples the pump light beams into the active fiber. A method for coupling multiple pump light beams to an active fiber. The method includes providing an inverted conical disk, concave lens or glass wedge. The method further includes providing an active fiber in approximately the center of the inverted conical disk (or concave lens) or at a bottom facet of the glass wedge.

Abstract: Disclosed are a nitride semiconductor laser element including a light emitting portion made of a nitride semiconductor, and an external-cavity semiconductor laser device using it. In the nitride semiconductor laser element, a coat film made of silicon oxynitride is formed on the light emitting portion, and the reflectance of the coat film to feedback light of laser light emitted from the light emitting portion is 0.5% or less.

Abstract: An optical waveguide device comprises a plurality of mirrors, wherein at least one mirror comprises a first and second reflective end that reflect and transmit light. The plurality of mirrors comprises at least one first material having at least one first refractive index; an axis line; a first cladding comprising a second material having a second refractive index; a second cladding, formed above the first, comprising a third material having a third refractive index; a core comprising a fourth material; and a plurality of core parts formed within at least one of the first or second claddings. The fourth material has a fourth refractive index that is greater than the second and third refractive indices and the core parts have a plurality of core part ends coupled to one of the reflective ends where at least one core part end is approximately parallel to one of the reflective ends.

Abstract: A digital image projector includes a light assembly configured to project light along a light path from at least one laser array light source, the projected light having an overlapping far field illumination in a far field illumination portion of the light path; a temporally varying optical phase shifting device configured to be in the light path; an optical integrator configured to be in the light path; a spatial light modulator located downstream of the temporally varying optical phase shifting device and the optical integrator in the light path, the spatial light modulator configured to be located in the far field illumination portion of the light path; and projection optics located downstream of the spatial light modulator in the light path, the projection optics configured to direct substantially speckle free light from the spatial light modulator toward a display surface.

Abstract: A laser system has an output/input coupler unit (49) with a circulator (37). An output of the circulator (37) is operationally connected to a detector unit (43). The input/output (EA37) of the circulator is operationally connected to a transmitter and a receiver optics 41. Laser light is input to the circulator (E37). The input (E37), output (A37) and output/input (EA37) of the circulator are optical fibers. The pulsed diode (3) is not temperature stabilized. To reduce amplified spontaneous emission (ASE) generated in the optical fiber amplifier (9), a narrow band-pass filter unit (29) is used. Filter unit (29) has a central wavelength with a temperature dependence which is matched to the temperature dependent wavelength shift of the pulsed diode (3).

Abstract: In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror being constituted by two multilayer mirrors and a cavity layer sandwiched between the two multilayer mirrors, and causing a mirror dispersion of ?3000 fsec2 to ?600 fsec2 and realizes a reflectance of 97% to 99.5%.

Abstract: In a mode-locked laser-diode-excited laser apparatus: a solid-state laser medium is arranged at a distance of at most twice the Rayleigh range from a saturable absorbing mirror with a depth of absorbing modulation of at least 0.4%; the total intracavity dispersion is smaller than zero and makes oscillating light have such a pulse bandwidth that the saturable absorbing mirror can suppress a background pulses other than soliton pulses repeated with a fundamental repetition period, and the magnitude of the total intracavity dispersion has a predetermined relationship with a pulse width of the oscillating light; and an output mirror is a negative-dispersion mirror being constituted by three or more multilayer mirrors and cavity layers arranged at predetermined intervals between the three or more multilayer mirrors, and causing a mirror dispersion of ?3000 fsec2 to ?600 fsec2 and realizes a reflectance of 97% to 99.5%.

Abstract: When configuring a surface emitting laser by a semiconductor material not capable of largely extracting a refractive-index difference, the surface emitting laser using a photonic crystal capable of forming a waveguide is provided.

Abstract: A laser includes a regenerative ring resonator that includes a discharge chamber having electrodes and a gain medium between the electrodes for producing a laser beam; a partially-reflective optical coupler, and a beam modification optical system in the path of the laser beam. The beam modification optical system transversely expands a profile of the laser beam such that the near field laser beam profile uniformly fills each aperture within the laser and such that the regenerative ring resonator remains either conditionally stable or marginally unstable when operating the laser at powers that induce thermal lenses in optical elements inside the regenerative ring resonator.

Abstract: A laser module includes a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, a temperature detecting element that detects a temperature of the output optical system; and an output controller that calculates a drive current to set an optical output intensity of the laser module at a desired value on the basis of temperature information obtained by the temperature detecting element, and outputs the drive current to the semiconductor laser.

Abstract: A high-power narrow-linewidth fiber laser system includes a seed oscillator with multiple resonant cavities and an amplifier stage. The seed oscillator includes a gain fiber, a pump source to introduce pump light into the gain fiber, a single-mode output fiber arranged at the end of the active gain fiber, a first resonant cavity including the active gain fiber, and a second resonant cavity including the active gain fiber. The first and second resonant cavities cooperate to minimize the synchronization of longitudinal modes and thereby reduce modal beating. The amplifier preferably includes an active multimode gain fiber capable of supporting a single fundamental mode at the signal wavelength, wherein the single mode output fiber of the seed oscillator and the multimode gain fiber of the amplifier are mode-matched and coupled without a mode converter.

Abstract: An optical module 10 has a laser light source 20, optical branching means 24 for receiving laser light from the laser light source 20, making a part of the laser light pass through the optical branching means and branching a remaining part of the laser light; a photodetecting portion 30P receiving the remaining part of the laser light branched from the optical branching means 24 and a package 11 holding therein the laser light source 20, the optical branching means 24 and the photodetecting portion 30P, the package 11 having stray light reducing means 200, 201 and 202 provided therein to reduce stray light generated inside the package.

Abstract: A laser diode illuminator device and a method for optically conditioning the output beam radiated from such a device, so that highly-demanding illumination application requirements that call for high output powers within a specified field of illumination can be addressed. At the heart of the device is a two-dimensional stack of laser diode bars wherein the linear array of beamlets radiated by each laser diode bar is optically conditioned through its passage in a refractive-type micro-optics device followed by a cylindrical microlens. The micro-optics device performs collimation of the linear array of beamlets along the fast axis of the bars, and it also acts as a beam symmetrization device by interchanging the divergences of the laser beamlets along the fast and slow axes. The cylindrical microlens is for collimation of the beamlets along the slow axis.

Abstract: A surface emitting laser which oscillates at a wavelength ? of a blue band, including a photonic crystal layer including a photonic crystal structure, an active layer provided on one surface of the photonic crystal layer, and an electrode provided on the other surface of the photonic crystal layer for injecting electric current into the active layer. The photonic crystal structure has a thickness of 100 nm or more. A laser beam is emitted toward a direction opposite to a side of the photonic crystal layer on which the electrode is provided.

Abstract: An optical distributor for the distribution of light, in particular laser light, between at least one optical input and at least one of several optical outputs includes at least one movably disposed light guide and a positioning member for moving the at least one light guide, the movably disposed light guide being movable by the positioning member such that at least one of the optical inputs is connectable via the light guide to at least one of the optical outputs.

Abstract: A powerful fiber laser system is configured with at least one large-area multi-clad rare-earth doped fiber, which is configured with a MM core capable of propagating a single mode laser emission at a first wavelength, and with at least one pumping assembly capable of generating an optical pump output at a wavelength shorter than the first wavelength of the rare-earth doped fiber. The pumping assembly has a plurality SM fiber lasers coupled to a SM-MM combiner which is operative to lunch the pump output into the cladding of the rare-earth doped fiber so that the powerful fiber laser system is operative to deliver a power of up to 20 kW.

Abstract: A laser beam source device includes: a light source which emits light having fundamental wavelength; a wavelength conversion element which converts the light having fundamental wavelength into light having conversion wavelength; a resonance element which transmits first light converted into the conversion wavelength light and reflects light not converted; an optical path conversion element which releases second light contained in the light reflected by the resonance element and converted into the conversion wavelength light in the same direction as the direction of the first light, and releases the light not converted toward the light source; and a supporting member. The resonance element is disposed in such a position that one end surface of the resonance element on the second light side is shifted to the supporting member from one end surface of the wavelength conversion element on the second light side.

Abstract: This laser beam processing apparatus includes a fiber laser oscillator, a laser beam branching unit, a laser beam injecting unit, a fiber transmission system, a laser beam irradiating unit, and a processing table. Based on a fiber laser beam, which is oscillation-outputted from the fiber laser oscillator, the laser beam branching unit executes simultaneous multi-branching from the fiber laser beam into a plurality of branched laser beams. The laser beam injecting unit injects the branched laser beams respectively into optical fibers for transmission and the laser beam irradiating units condense and apply the branched laser beams from the optical fibers for transmission respectively to processing points.

Abstract: A method for operating an ignition device for an internal combustion engine, particularly of a motor vehicle, having a laser device which has a laser-active solid that has a passive Q-switch. The duration of a pumping light pulse that is applied to the laser device is selected as a function of a specifiable number of laser pulses that is to be generated using the laser device.

Abstract: A light source device includes: a laser light source emitting a laser beam of a prescribed wavelength; a nonlinear optical element, disposed facing a light emergence surface of the laser light sources which converts an emission wavelength of the laser beam emitted from the laser light source and causes the laser beam to emerge; a volume phase grating, disposed facing an emergence surface of the laser beam of the converted wavelength converted by the nonlinear optical element, which has formed in an interior thereof a Bragg grating structure which selectively reflects a laser beam of an emission wavelength; and a first dielectric multilayer, provided on a light emergence surface of the volume phase gratings which transmits the laser beam of the converted wavelength and reflects the laser beam of the emission wavelength.

Abstract: A beam coupler assembly for a fiber laser is disclosed. The assembly includes a housing having a sidewall with an interior surface, an exterior surface, a first end and a second end. A first seal extending from the interior surface of the tubular housing and dividing the housing into a first section and a second section is also provided. The first section and second section are environmentally isolated from one another. However, the first seal is substantially optically neutral. An input collimator unit received within the first end of the sidewall of the housing and into the first section and is releasably coupled thereto. An output collimator unit received within the second end of the sidewall of the housing and into the second section and is also releasably coupled thereto.

Abstract: An electrical-optical coupling and detecting device. An apparatus according to an embodiment of the present invention includes a reflective surface defined on semiconductor material. The reflective surface is to reflect an incident optical beam towards an optical destination. An optical detector is monolithically integrated in the reflective surface of the semiconductor material. The optical detector arranged in the reflective surface of the semiconductor material is to detect the incident optical beam.

Abstract: A color-mixing laser module is disclosed, which is comprised of a laser unit capable of emitting red, blue and green laser beams; a beam combiner, for receiving and converging the laser beams emitted from the laser unit and then directing the converged laser light to illuminate on a light pattern adjusting unit; and the light pattern adjusting unit, capable of receiving the converged laser light from the beam combiner for adjusting the pattern of the same.

Abstract: A laser system. The laser system includes a first laser device configured to emit a first laser beam, a second laser device configured to emit a second laser beam, and a third laser device configured to emit a third laser beam. The laser system also includes a laser combiner configured to receive the first, second, and third laser beams and output the first, second, and third laser beams with less separation downstream of the laser combiner than upstream of the laser combiner.

Abstract: A YAG/Nd:YAG block where an Nd:YAG block ends in a peak integrated inside a YAG block. The YAG block has reflective surfaces positioned at 45° to one another. The angled reflective surfaces serve as a “mirror” within the laser cavity to effectively increase the length of the cavity by a factor greater than 2. Fused to the output end of the laser cavity are a polarizer, an active/passive Q-switch, a one quarter waveplate and an output coupler. In operation, the laser cavity is pumped either from the side or the end of the cavity. The optical components of the present invention are bonded to form one optical ‘block’. All the components are prealigned during the crystal manufacturing process to form the optical laser cavity. The width of the cavity should be selected such that nearly all of the laser diode pump output is absorbed by the cavity.

Abstract: A semiconductor laser comprises two optical ring resonators, each comprising an optical waveguide electrically pumped to provide optical gain. The two ring resonators have different round-trip optical path lengths, and are coupled to each other through a half-wave optical coupler. The half-wave optical coupler has a predetermined cross-coupling coefficient and a 180-degree cross-coupling phase. The cross-coupling coefficient is substantially less than the self-coupling coefficients in order to achieve an optimal single-mode selectivity of the laser. The first ring resonator has an optical path length such that its resonant wavelengths correspond to a set of discrete operating channels. The second ring resonator has a slightly different length so that only one resonant wavelength coincides with one of the resonant wavelengths of the first ring resonator over the operating spectral window. The lasing action occurs at the common resonant wavelength.

Abstract: An improved resonator and optical cavity is adapted for use with a chemical laser that has a nozzle upstream of the resonator that emits a gain medium in a flow direction, and a pressure-recovery system downstream of the resonator. The optical resonator comprises first and second optical elements that are spaced apart from one another along an optical axis. Each of the optical elements has a selected geometry and a selected optical transmissivity to permit transmissive outcoupling of a beam of laser radiation from the resonator, the outcoupled beam being transmitted about the optical axis. The transmissivity and geometry of each optical element is selected to define an unstable region between the optical elements and around the optical axis, and a stable region in a region surrounding the unstable region and spaced apart from the optical axis.

Abstract: An optical resonator has a Y-branched waveguide including first, second, and third optical waveguides interconnected at a single point. The first optical waveguide leads toward a reflector. The second and third optical waveguides are optically interconnected by a curved extension of the second and third optical waveguides, or by an independent ring waveguide to which the second and third optical waveguides are directionally coupled. At least one wavelength selector such as a Mach-Zehnder interferometer is formed in one or both of the second and third optical waveguides. This optical resonator is small in size and can be tuned by means of a single parameter. A tunable laser can be formed by inserting an optical amplifier between the first optical waveguide and the reflector.

Abstract: A surface light emitting semiconductor laser element, comprises a substrate, a lower reflector including a semiconductor multi-layer disposed on the substrate, an active layer disposed on the lower reflector, an upper reflector including a semiconductor multi-layer disposed on the active layer, a compound semiconductor layer having a first opening for exposing the upper reflector and extending over the upper reflector, and a metal film having a second opening for exposing the upper reflector disposed inside of the first opening and extending over the compound semiconductor layer, wherein the metal film and the compound semiconductor layer constitute a complex refractive index distribution structure where a complex refractive index is changed from the center of the second opening towards the outside. A method of emitting laser light in a single-peak transverse mode is also provided.

Abstract: A laser source assembly comprises a laser diode for generating a laser beam and a focusing lens for focusing the light beam. A spacer is provided for keeping the diode and the lens at a predetermined distance, and is made of a material of low expansion coefficient. Preferably, the subassembly constituted of the diode, the spacer and the lens is housed in a case made of another material that may have a higher expansion coefficient. A resilient element is provided to continuously keep the diode and the lens abutting on the opposite ends of the spacer.

Abstract: A surface emitting laser (100) and a monitoring photodetector (MPD) 158 are mounted in a TO (transistor outline package) can (150) on the same plane as one another. Light from a rear facet (108) of the laser is directed to the MPD through a polymer light guide (164).

Abstract: An optical coupling device for coupling light with an optical waveguide comprises a mirror formed within an optical waveguide. The mirror comprises a first material, a first reflective end, and a second reflective end. The first material is light conducting and has a first refractive index. The first and second reflective ends reflect and transmit light. The mirror has an axis line. The optical coupling device is useful for extracting light from a waveguide and providing a backlight for a liquid crystal display.

Abstract: A first light feedback element is arranged at an optical distance L1 from a front facet of a semiconductor laser from which an output light is emitted on an optical path of the output light. An i-th light feedback element is arranged at an optical distance Li from the front facet on the optical path of the output light, where i=2 to n, n is a positive integer not less than 2, and Li>L1. L1 and Li satisfies ((M?1)+0.01)<(Li/L1)<(M?0.01), where M is a positive integer not less than 2, satisfying (M?1)<(Li/L1)?M.

Abstract: A portable laser head has a single-piece holder configured with a plurality of spaced-apart nests. The nests are arranged to receive at least a non-linear frequency converter, a V-shaped beam splitter and a dump collimator. Alternatively, the holder has multiple nests configured to receive an input collimator and output focusing optics unit in addition to the non-linear frequency converter, V-shaped beam splitter and dump collimator. The holder is characterized by small dimensions allowing for self-alignment of the above-referred components.

Abstract: Application of a modular coaxial package design, compatible with telecommunication passive component packaging, to microchip lasers, in particular to passively Q-switched microlasers, pumped with a fiber-coupled diode, is disclosed. The number of parts is thereby reduced while providing the adequate degrees of freedom for the active or passive alignment of the optical elements within the package.