Abstract: The present invention relates to an apparatus for generating an ultra-short ultra-high intensity pulse laser, comprising: a pulse laser providing unit which generates an ultra-short ultra-high intensity pulse laser, stretches pulse width, then selects and provides only a pulse laser having a predetermined polarizing angle; a polarization characteristic adjusting unit which divides the pulse laser provided by the pulse laser providing unit into S-polarizing component light and P-polarizing component light, varies the phase difference and amplitude difference between the S-polarizing component light and the P-polarizing component light, and combines the two types of light to generate a pulse laser with varied polarization characteristics; and a pulse compression unit which compresses the pulse width of the pulse laser, the polarization characteristics of which are varied by the polarization characteristic adjusting unit, and outputs the pulse laser.

Abstract: The present invention relates to a method and device for the detection or correction of defects in machines, whereby a defect is optically and/or acoustically displayed at its point of origin and/or correction by means of at least one reporting device (5). According to the invention, the reporting device (5) is arranged independently from the location and is preferably centrally arranged. Furthermore, the reporting device (5) marks the point of origin and/or correction of the defect remotely and both in an optical and/or acoustical manner.

Abstract: An optical apparatus comprises a waveguide substrate and an optical reference cavity. The optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 cm in length. The RMS resonance frequency fluctuation is less than or about equal to 100 Hz. The Q-factor can be greater than or about equal to 108. The optical waveguide can exhibit optical loss less than or about equal to 0.2 dB/m for propagation of an optical signal along the optical waveguide. The closed loop path can comprise two or more linked spirals greater than or about equal to 1 meter in length and can occupy an area on the waveguide substrate less than or about equal to 5 cm2.

Abstract: The present invention is directed to a laser system in which a current laser wavefront performance of the laser system may be monitored. Further, the laser system embodiments disclosed herein may be configured for correcting the laser wavefront internally via correction system(s) within the laser system. Still further, the correction system(s) disclosed herein may provide a long lifetime of performance and may be configured for having a minimal impact on photocontamination.

Abstract: A method of pulsed laser intrinsic marking can provide a unique identifier to detect tampering or counterfeiting.

Abstract: This image display apparatus includes a plurality of laser beam source portions outputting laser beams of a plurality of color components different from each other, a synthesized beam generation portion synthesizing the laser beams of the plurality of color components, a control portion controlling the outputs of the laser beam source portions, and a driving current correction portion estimating a variation in the threshold current of each of the laser beam source portions and correcting a driving current on the basis of the estimated variation in the threshold current.

Abstract: A laser system in this disclosure may include: a master oscillator configured to output pulsed laser light, a coherence reduction optical system configured to reduce coherence of the pulsed laser light from the master oscillator, and a controller configured to control the coherence reduction optical system so that a speckle of the pulsed laser light varies.

Abstract: Photonic crystal cavities and related devices and methods are described. The described cavities can be used as lasers, photovoltaic sources, and single photon sources. The cavities can be both optically and electrically pumped. A fabrication process of the cavities is also described.

Abstract: The present invention relates to a higher-order dispersion compensation device (210), the device being adapted to cooperate with a pair of optical components (P1, P2), e.g. a pair of prisms, being arranged to compensate first-order dispersion by separating different wavelengths spatially. The compensation device (210) has the form of a phase plate, wherein the phase change for each wavelength is adjusted by designing the height (h) at the corresponding position (x) of the plate so as to substantially compensate for higher-order dispersion. The invention is advantageous for obtaining a higher-order dispersion compensation device which is relatively simple to construct and use making it a quite cost-effective device. The invention also relates to a corresponding optical system and method for compensating dispersion where this is important, e.g. in a multiple-photon imaging system.

Abstract: A femtosecond laser based laser processing system having a femtosecond laser, frequency conversion optics, beam manipulation optics, target motion control, processing chamber, diagnostic systems and system control modules. The femtosecond laser based laser processing system allows for the utilization of the unique heat control in micromachining, and the system has greater output beam stability, continuously variable repetition rate and unique temporal beam shaping capabilities.

Abstract: A laser system is provided which selectively excites Raman active vibrations in molecules. In another aspect of the present invention, the system includes a laser, pulse shaper and detection device. A further aspect of the present invention employs a femtosecond laser and binary pulse shaping (BPS). Still another aspect of the present invention uses a laser beam pulse, a pulse shaper and remote sensing.

Abstract: A method for producing a laser device having a laser configured in order to emit a laser beam, a lens (31) which is positionally adjusted with respect to the laser, and a lens holder having at least two parts (2a, b, c) then following one another in a propagation direction (3) of the laser beam, of which at least two lens holder parts (2a, h, c) each have an end side oriented obliquely with respect to the propagation direction (3) and can be brought into a multiplicity of relative positions with respect to one another, respectively, with their end sides oriented obliquely with respect to the propagation direction (3) bearing on one another, wherein the length of the lens holder (1) in the propagation direction (3) is adjusted by selecting one of the relative positions.

Abstract: Optical gain of a nonpolar or semipolar Group-III nitride diode laser is controlled by orienting an axis of light propagation in relation to an optical polarization direction or crystallographic orientation of the diode laser. The axis of light propagation is substantially perpendicular to the mirror facets of the diode laser, and the optical polarization direction is determined by the crystallographic orientation of the diode laser. To maximize optical gain, the axis of light propagation is oriented substantially perpendicular to the optical polarization direction or crystallographic orientation.

Abstract: A composition of matter is provided having the general chemical formula K(H,D)2P(16Ox,18Oy)4, where x<0.998 or y>0.002, and x+y?1. Additionally, a method of fabricating an optical material by growth from solution is provided. The method includes providing a solution including a predetermined percentage of (H,D)216O and a predetermined percentage of (H,D)218O, providing a seed crystal, and supporting the seed crystal on a platform. The method also includes immersing the seed crystal in the solution and forming the optical material. The optical material has the general chemical formula K(H,D)2P(16Ox,18Oy)4, where x<0.998 or y>0.002, and x+y?1.

Abstract: An economical slab laser for high power applications. The laser is a lamp driven slab design with face-to-face beam propagation and an end reflection that redirects the amplified radiation back out the input surface. Also presented is a side-to-side larger amplifier configuration, permitting very high average and peak powers due to the electrical efficiency of converting and getting energy into the crystal, optical extraction efficiency, and scalability of device architecture. Cavity filters adjacent to pump lamps convert the unusable UV portion of the pump lamp spectrum into light in the absorption band of the slab laser thereby increasing the overall pump efficiency. The angle of the end reflecting surface is changed to cause the exit beam to be at a different angle than the inlet beam, thereby eliminating the need to separate the beams external to the laser with the subsequent loss of power.

Abstract: Various technologies pertaining to aligning and focusing mirrored facets of a heliostat are described herein. Updating alignment and/or focus of mirrored facets is undertaken through generation of a theoretical image, wherein the theoretical image is indicative of a reflection of the target via the mirrored facets when the mirrored facets are properly aligned. This theoretical image includes reference points that are overlaid on an image of the target as reflected by the mirrored facets of the heliostat. A technician adjusts alignment/focus of a mirrored facet by causing reflected reference markings to become aligned with the reference points in the theoretical image.

Abstract: Techniques and devices for generating laser light that use large mode area fiber amplifiers and curved fiber sections to achieve desired operations in a fundamental fiber mode with high pulse quality and optical beam quality while reducing presence of high order fiber modes in continuous wave and pulsed laser devices.

Abstract: A system and a method for controlling the quality of an industrial process, of the type that comprises the steps of: providing one or more reference signals for the industrial process; acquiring one or more real signals that are indicative of the quality of said industrial process; and comparing said one or more reference signals with said one or more real signals in order to identify defects in said industrial process.

Abstract: There are provided high power laser devices and systems for transmitting a high power laser beam across a rotating assembly, including optical slip rings and optical rotational coupling assemblies. These devices can transmit the laser beam through the rotation zone in free space or within a fiber.

Abstract: A tunable laser system having fine and coarse wavelength discrimination is provided. The tunable laser system includes a first filter having a first free spectral range (FSR) and a second filter having a second FSR different from the first FSR. The first filter provides a first series of pulses from a first portion of a laser output, and a second filter provides a second series of pulses from a second portion of the laser output. A processing system compares the first series of pulses and the second series of pulses to identify a series of markers, in which the markers are separated by a beat period of the first series of pulses and the second series of pulses. Advantageously, the series of markers may be used for mode-hop detection and/or for wavelength referencing.

Abstract: Techniques and devices for generating laser light that use large mode area fiber amplifiers and designed coiling fiber sections to achieve desired operations in a fundamental fiber mode with high pulse quality and optical beam quality while reducing presence of high order fiber modes in continuous wave (CW) and pulsed laser devices.

Abstract: Apparatus for combining laser radiation (1) 5 which apparatus comprises a seed laser (2), a splitter (3), a plurality of amplifier chains (4), a reference amplifier chain (7), detection means (5). demodulator means (6), and phase control means (12), wherein each of the amplifier chains (4) comprises at least one optical amplifier (11), optical radiation (17) emitted from the seed laser (2) is split into the plurality of amplifier chains (4) by the splitter (3).

Abstract: A device for amplifying a laser beam along an axis comprises: an amplifying bar structure of index nc, delimited by a surface connecting the input and output faces of the structure, having a dimension e along the axis and ? along a perpendicular direction, with e<?, and intended to be pumped to become a gain medium with a maximum along a face, and a liquid of index nA which surrounds the structure in relation to its surface and which is absorbent or scattering at the fluorescence wavelength of the amplifying bar structure. The surface comprises a first tooth in the form of a chamfer at its junction with the maximum gain face, to avoid causing parasitic transverse lasing and the liquid of index nA has a heat capacity of greater than 3000 Joules per kilogram per K° to dissipate the thermal power induced by the pumping.

Abstract: A laser beam processing machine comprising a laser beam application means for applying a laser beam to a workpiece held on a chuck table and a processing-feed means, wherein the laser beam application means comprises a first pulse laser beam application means and a second pulse laser beam application means; the first pulse laser beam application means comprises an acousto-optic deflection means for deflecting the optical axis of a pulse laser beam oscillated by a first pulse laser beam oscillation means in the processing-feed direction (X direction), and a first condenser lens for converging a pulse laser beam passing through the acousto-optic deflection means; the second pulse laser beam application means comprises a second condenser lens for converging a pulse laser beam oscillated by the second pulse laser beam oscillation means; and an NA value of the first condenser lens is set smaller than the NA value of the second condenser lens.

Abstract: The present invention relates to a solid dye resonator, and to a solid dye laser hand piece comprising same. The solid dye resonator comprises: solid dye; a high-reflection mirror; an output coupler; a first mounting plate on which the high-reflection mirror is mounted; a second mounting plate which is spaced apart from the first mounting plate and which has a surface on which the output coupler is mounted; a driving motor mounted on the first mounting plate, such that a motor shaft is directed toward the second mounting plate; and a rotary shaft interposed between the first mounting plate and the second mounting plate, and connected to the motor shaft of the driving motor such that the rotary shaft interlockingly rotates with the rotation of the driving motor.

Abstract: An exemplary brittle non-metallic workpiece (70) is made by the laser beam (31), a cutting surface (701 ) of the brittle non-metallic workpiece has no micro cracks. A method for making the brittle non-metallic workpiece includes: focusing a laser beam on the brittle non-metallic substrate to form an elliptic beam spot; driving the laser beam to move along a predetermined curved cutting path, making a center of a major axis of the elliptic beam spot intersecting along the predetermined curved cutting path and the major axis being tangent to the predetermined curved cutting path at the intersecting point; a coolant stream following the elliptic beam spot to move, thus producing a crack in the brittle non-metallic substrate corresponding to the predetermined curved cutting path; separating the brittle non-metallic substrate along the crack. A laser cutting device (40) for making the same is also provided.

Abstract: A laser marking apparatus is provided with a laser emission unit that emits laser beam and a laser radiation unit that is detachably connected to the laser emission unit. The laser radiation unit radiates the laser beam emitted from the laser emission unit toward an object to be processed. A projection, which projects rearward, is formed on a part of the laser radiation unit that is connected with the laser emission unit. A recess is provided in a part of the laser emission unit that is connected with the laser radiation unit. The projection can fit into the recess. The recess is opened forward, backward, to lateral sides, and downward.

Abstract: The present invention provides, in at least one embodiment, a system and method for power control of lasers. The system includes a device's control signal fed into a laser. The laser can be a master oscillator power amplifier (MOPA) fiber laser. The device includes an equivalent model circuit representing at least one parameter of the laser, such as the gain fiber inversion in the power amplifier. The device measures the power at the equivalent model circuit. Then, the device uses its feedback signal to control and/or adjust the output power control signal fed into the laser based on the measured power. By controlling the power fed into the laser, the laser can be operated at much lower frequencies while keeping the laser power within acceptable limits.

Abstract: A laser that emits light at all available frequencies distributed throughout the spectral bandwidth or emission bandwidth of the laser in a single pulse or pulse train is disclosed. The laser is pumped or seeded with photons having frequencies distributed throughout the superunitary gain bandwidth of the gain medium. The source of photons is a frequency modulated photon source, and the frequency modulation is controlled to occur in one or more cycles timed to occur within a time scale for pulsing the laser.

Abstract: In the case of a lens array type homogenizer optical system, the incident angle and intensity of a laser beam 1 entering a large-sized lens (long-axis condenser lens 22) of a long-axis condensing optical system, which is provided on the rear side, are changed for every shot by performing laser irradiation while long-axis lens arrays 20a and 20b are reciprocated in a direction corresponding to a long axial direction of a linear beam (X-direction). Therefore, vertical stripes are significantly reduced. Further, the incident angle and intensity of a laser beam 1 entering a large-sized lens (projection lens 30) of a short-axis condensing optical system, which is provided on the rear side, are changed for every shot by performing laser irradiation while short-axis lens arrays 26a and 26b are reciprocated in a direction corresponding to a short axial direction of a linear beam (Y-direction). Therefore, horizontal stripes are significantly reduced.

Abstract: This description relates to an apparatus, a method of manufacturing, and a method of tuning optical and/or electrical parameters of semiconductor devices and materials, thin film materials, or other devices. In one example, a laser is tuned to produce an adjustable output wavelength by coupling the laser to a tuning material or base such as, for example, a piezoelectric base using a suitable attachment method. The laser includes of a tunable material that is sensitive to stress and/or strain. Stress and/or strain applied to the laser from the tuning material results in an electronically variable output wavelength. As an example, applying a voltage to a piezoelectric base that serves as a tuning material can cause the base to expand or contract, and the expansions and contractions from the base are coupled to the tunable material of the laser, thus varying the wavelength of the output light from the laser.

Abstract: Techniques are disclosed for improving pump absorption and efficiency for fiber lasers and amplifiers, for instance. In some embodiments, the techniques are implemented by applying a partially reflective coating on a fiber end-face to double-pass any unabsorbed or otherwise excess pump light in the cladding of a fiber. While being reflective to pump wavelengths, the coating can be non-reflective at the lasing wavelength, so as to avoid unwanted feedback into the system. The benefits of this approach include that excess pump power can be effectively utilized to add more power to the laser output. In addition, the double-pass technique allows for the use of a shorter fiber length, which in turn allows for more compact system designs, saves on material costs, and facilitates manufacturability.

Abstract: A laser system employs a window integrated in the surface of a weapon platform. A high energy laser is mounted in the weapon platform to provide a laser beam which is received by a Coude' path for internal direction of the beam. A beam director receives the laser beam from the Coude' path and employs an outer steering assembly and an inner steering assembly to cooperatively provide pointing of a centerline of the laser beam at a substantially single location on the window for a full conical field of regard.

Abstract: The present invention relates to a MOPA light source capable of obtaining pulse output by wavelength-conversion of pulse light of fundamental light wave using a simple configuration, and suppressing optical output using a simple method when processing is not performed. The fundamental light wave outputted from a seed light source is amplified in an optical amplification fiber. The amplified fundamental light wave is inputted to one end of a passive optical fiber, and propagates in the passive optical fiber. In the passive optical fiber, stimulated Raman scattering occurs upon propagation of the fundamental light wave. The light of fundamental light wave and light of stimulated Raman-scattered components are outputted from the other end of the passive optical fiber. The light outputted from the passive optical fiber is collimated by a lens, and is then inputted to a branching filter.

Abstract: A technique is described for generating a Bessel beam. An input optical fiber is provided that supports propagation in the fundamental mode. The input fiber is connected to a fiber mode converting device that provides phase matching, at a predetermined excitation wavelength, between the fundamental mode and a selected azimuthally symmetric higher-order mode. As an input to the fiber mode converting device, a coherent light beam is fed through the input optical fiber to provide a fundamental mode input at the excitation wavelength. The fiber mode converting device resonantly excites the selected azimuthally symmetric mode. The azimuthally symmetric mode is provided as a beam output from an endface of the fiber mode converting device to approximate a Bessel beam.

Abstract: Disclosed is a laser device. The laser device includes a pulse generator which irradiates a laser beam between a high reflector mirror and an output coupler mirror to amplify and resonate the laser beam, a pulse output section which receives a laser beam pulse amplified and resonated through the output coupler mirror to output the laser beam pulse, and a Q switch which moves backward or forward in a direction perpendicular to a path of the laser beam formed between the pulse generator and the high reflector mirror. The output coupler mirror includes first and second mirrors provided on a base plate. Positions of the first and second mirrors are selectively changed as the Q switch moves backward or forward.

Abstract: A lasing wavelength of a laser diode is determined by applying a forward current to the p-n junction of the laser diode and measuring a voltage across the p-n junction. The lasing wavelength can be determined by performing a simple wavelength calibration of the laser diode. This allows one to stabilize the lasing wavelength, and also to use the laser diode as a reference wavelength source.

Abstract: A laser irradiation system includes a laser configured to irradiate light, a laser transfer unit configured to transfer the laser along a target irradiation area, the target irradiation area being divided into a plurality of sections, a laser transfer controller configured to control a speed of the laser in each of the plurality of sections of the target irradiation area, a laser output controller configured to control an output level of the laser in each of the plurality of sections of the target irradiation area, and a main controller configured to control the laser output controller and the laser transfer controller.

Abstract: A display system includes a substrate guided relay and a scanning projector. The scanning projector exhibits a brightness variation on a resonant scanning axis, and the substrate guided relay exhibits a brightness variation along a length of an output coupler. The scanning projector includes a brightness compensation circuit to compensate for both the brightness variation caused by the resonant scanning and the brightness variation along the length of the output coupler.

Abstract: An optical device includes a drive unit configured to drive a light source that outputs a laser beam; a detecting unit configured to detect the laser beam output from the light source; a converting unit configured to convert an output of the detecting unit into a value within a predetermined range; and a control unit configured to control the drive unit to switch a light quantity of the laser beam output from the light source from a first light quantity within an imaging light quantity range for forming an image to a second light quantity outside the imaging light quantity range, or vice versa. The converting unit converts an upper limit light quantity in the imaging light quantity range into a maximum value in the predetermined range, and converts a lower limit light quantity in the imaging light quantity range into a minimum value in the predetermined range.

Abstract: An optical device includes: a light source that emits laser beams; a detecting unit that detects the laser beams and converts light amounts of the detected laser beams into voltage values; a first storage unit that stores in advance a light amount to be output for each of the laser beams and the voltage value; a second storage unit that stores in advance a value indicating light use efficiency of an optical system that guides the laser beams to a surface to be scanned for scanning; a calculating unit that calculates a target voltage value for each of the laser beams based on the light amount and the voltage value and also on the value indicating the light use efficiency; and a control unit that controls emission power for each of the laser beams so that the voltage value output from the detecting unit approaches the target voltage value.

Abstract: Provided is a laser device comprising a substrate, an active layer, and a current confinement layer. The current confinement layer includes an oxide layer that is formed extending from a edge of the current confinement layer in a parallel plane parallel to a surface of the substrate, toward a center of the current confinement layer along the parallel plane, and that does not have an inflection point between the edge and a tip portion formed closer to the center or has a plurality of inflection points formed between the edge and the tip portion.

Abstract: A compact solid state laser that generates multiple wavelengths and multiple beams that are parallel, i.e., bore-sighted relative to each other, is disclosed. Each of the multiple laser beams can be at a different wavelength, pulse energy, pulse length, repetition rate and average power. Each of the laser beams can be turned on or off independently. The laser is comprised of an optically segmented gain section, common laser resonator with common surface segmented cavity mirrors, optically segmented pump laser, and different intra-cavity elements in each laser segment.

Abstract: Embodiments of the invention provide a laser light source comprising: a plurality of lasers connected in series; and a laser driver controllable to simultaneously drive a substantially same current through a combination of the lasers selectable from different combinations of lasers in the plurality of lasers and not through lasers in the plurality of lasers that are not in the combination.

Abstract: A composition of matter is provided having the general chemical formula K(H,D)2P(16Ox,18Oy)4, where x<0.998 or y>0.002, and x+y?1. Additionally, a method of fabricating an optical material by growth from solution is provided. The method includes providing a solution including a predetermined percentage of (H,D)216O and a predetermined percentage of (H,D)218O, providing a seed crystal, and supporting the seed crystal on a platform. The method also includes immersing the seed crystal in the solution and forming the optical material. The optical material has the general chemical formula K(H,D)2P(16Ox,18Oy)4, where x<0.998 or y>0.002, and x+y?1.

Abstract: A laser and monitoring system is provided. In another aspect of the present invention, the system includes a laser, pulse shaper and detection device. A further aspect of the present invention employs a femtosecond laser and binary pulse shaping (BPS). Still another aspect of the present invention uses a laser beam pulse, a pulse shaper and a SHG crystal. In yet another aspect of the present invention, a multiphoton intrapulse interference phase scan (hereinafter “MIIPS”) method is used to characterize the spectral phase of femtosecond laser pulses and to correct them. A further aspect of the system of the present invention is employed to monitor environmental chemicals and biological agents, including toxins, explosives, and diseases.

Abstract: A laser system using ultrashort laser pulses is provided. In another aspect of the present invention, the system includes a laser, pulse shaper and detection device. A further aspect of the present invention employs a femtosecond laser and a spectrometer. Still another aspect of the present invention uses a laser beam pulse, a pulse shaper and a SHG crystal. In yet another aspect of the present invention, a multiphoton intrapulse interference phase scan system and method characterize the spectral phase of femtosecond laser pulses. Fiber optic communication systems, photodynamic therapy and pulse characterization tests use the laser system with additional aspects of the present invention.

Abstract: Systems and methods reduce or prevent back-reflections in a laser processing system. A system includes a laser source to generate an incident laser beam, a laser beam output to direct the incident laser beam toward a work surface along a beam path, and a spatial filter. The system further includes a beam expander to expand a diameter of the incident laser beam received through the spatial filter, and a scan lens to focus the expanded incident laser beam at a target location on a work surface. A reflected laser beam from the work surface returns through the scan lens to the beam expander, which reduces a diameter of the reflected beam and increases a divergence angle of the reflected laser beam. The spatial filter blocks a portion of the diverging reflected laser beam from passing through the aperture and returning to the laser beam output.

Abstract: A tactical radiating device for directed energy includes at least two generators of high energy directed beams. At least one beam combining system combines high energy directed beams emitted by the generators into a combined high energy beam. A focusing device focuses the combined high energy beam.

Abstract: Populations of Salmonella in animals may be substantially reduced by treatment with a vaccine composition which has been produced by exposing whole, intact cells of a Salmonella species to irradiation with an electron beam under conditions effective to kill the cells. The electron beam irradiated cells of Salmonella are effective for stimulating protective immune responses in the animals against the Salmonella. Induction of these immune responses significantly reduces or eliminates the colonization of the animal by the Salmonella, and consequently reduces or eliminates the shedding of Salmonella in the feces of the animals.