Abstract: The invention relates to a laser device, comprising a radiation source (1) that emits radiation having a spectrum in the form of a frequency comb having a plurality of equidistant spectral lines, and a difference frequency generator (5) that converts the radiation in such a manner that the spectrum of the converted radiation once again has the form of a frequency comb, whereby the frequencies of the spectral lines in the spectrum of the converted radiation are harmonics of a base frequency. The invention proposes that a frequency multiplier (6) follows the difference frequency generator (5) in the course of the radiation.

Abstract: An improved solid-state laser for generating sub-200 nm light is described. This laser uses a fundamental wavelength between about 1030 nm and 1065 nm to generate the sub-200 nm light. The final frequency conversion stage of the laser creates the sub-200 nm light by mixing a wavelength of approximately 1109 nm with a wavelength of approximately 234 nm. By proper selection of non-linear media, such mixing can be achieved by nearly non-critical phase matching. This mixing results in high conversion efficiency, good stability, and high reliability.

Abstract: A compact, lightweight, laser target designator uses a TIR bounce geometry to place an end-pumped gain element functionally in the center of the resonator path, thereby allowing the resonator path to be terminated by a pair of crossed Porro prisms, so that the designator produces a high quality beam that is insensitive to alignment and temperature, and is low in manufacturing cost. Some embodiments fold the Porro legs of the resonator path back toward the gain element for compactness. Embodiments use a single gain element as both an oscillator gain element with TIR and as an output amplifier gain element without TIR. Various embodiments use block optical elements in a planar layout on a standard support medium such as aluminum to facilitate automated manufacturing.

Abstract: A light source device including a seed light generation device, a light amplification unit which optically amplifies seed light generated by the seed light generation device, and a wavelength conversion unit which converts the wavelength of the light optically amplified by the light amplification unit. The seed light generation device includes a pulsed light generation unit which generates pulsed light having a single wavelength, a pulse modulation unit which selectively passes and extracts a part of the pulsed light, and a timing adjustment unit which relatively adjusts the extracting timing of the pulsed light by the pulse modulation unit during the generation period of the pulsed light by the pulse generation unit, according to an operation.

Abstract: An apparatus and method that reduces laser speckle by using stimulated Raman scattering in an optical fiber. The fiber core diameter and length are selected to achieve a desired output color. An adjustable despeckler is formed by combining two optical fibers in parallel and adjusting the amount of light in each path.

Abstract: The invention relates to a laser resonator for generating frequency-converted laser radiation, comprising a laser-active solid-state medium and a wavelength conversion crystal. A transmissive optical element having a concavely curved surface for generating collimated laser radiation is arranged in the laser resonator.

Abstract: An ultraviolet laser device equips a laser beam output unit that includes first, second and third amplifiers that output first through third infrared laser beams, and first through third optical systems into which the first through third infrared laser beams through which the first through third infrared laser beams are propagated. A wavelength conversion unit includes a fourth optical system into which the combined first through third laser beams are incident through which they are propagated. The first optical system wavelength converts and generates the first infrared laser beam to a predetermined harmonic wave as the first laser beam, the fourth optical system includes a first wavelength conversion element that generates an earlier stage ultraviolet laser beam between the predetermined harmonic wave and the second laser beam, and the second wavelength conversion element generates an ultraviolet laser beam between the earlier stage ultraviolet laser beam and the third laser beam.

Abstract: An optical system includes a laser source operable to output a laser beam at a fundamental wavelength and a frequency conversion system. The frequency conversion system includes a frequency doubler module including a first plurality of nonlinear optical crystals and a frequency polarization tripler module including a second plurality of nonlinear optical crystals. The optical system also includes a control system coupled to the frequency conversion system and a diagnostics system coupled to the frequency conversion system.

Abstract: Laser master oscillator—power amplifier system for generating high pulse energy, high average power laser pulses in the ultraviolet 191.25-201.25 nm and 243-246.25 nm spectral ranges, and in the visible 450-537.5 nm spectral range with controllable pulse duration and pulse repetition rate employ a master oscillator seed laser operating in the infra-red spectral range, and a single series connected chain of hybrid fiber—bulk crystalline amplifiers coupled to a non-linear frequency conversion unit to convert the laser pulses to the ultraviolet and visible spectral ranges.

Abstract: As a spatial light modulator 35 is disposed between a wavelength conversion part 315 and an exit surface 311b in a ferroelectric crystal substrate 31, only zeroth-order light which is at a particular wavelength is guided to a substrate while laser light from the wavelength conversion part 315 is being modulated, whereby a pattern corresponding to LSI data is drawn. Further, the spatial light modulator 35 is disposed together with the wavelength conversion parts 314 and 315 inside the ferroelectric crystal substrate 31.

Abstract: The present invention relates to an apparatus for stabilizing second harmonic wave pulse output in a laser system operating by pulses. The apparatus of the present invention comprises: a pulse laser oscillating unit (110) which outputs a laser pulse; a nonlinear crystal (120) which converts the laser pulse of a first wavelength output by the pulse laser oscillation unit (110) into a second harmonic wave with a value that is half of the first wavelength, and outputs the converted second harmonic wave; and an optical absorption filter (130) which absorbs a portion of the energy of the converted second harmonic laser pulse from the nonlinear crystal (120) to output the second harmonic wave with a lower energy. The thus-configured apparatus of the present invention supplies a fundamental wave in a stable state and having a small PTP value and high level energy to the nonlinear crystal, in order to obtain the second harmonic wave which is in a more stable state and has a small PTP value and a variety of energies.

Abstract: A frequency-doubled OPS-laser having a desired output wavelength of 532 nm is tunable about that wavelength by a temperature tuned birefringent filter (BRF). The temperature of the BRF is varied while measuring transmission of a sample of the output through a Nd:YAG crystal having an absorption peak at a wavelength of about 532.4 nm. The peak is detected as a minimum of transmission and the temperature at which that minimum occurs is recorded. From wavelength-change-versus-temperature data for the BRF a temperature is calculated at which the output wavelength has the desired value and is maintained at that value to stabilize the output wavelength.

Abstract: A method for producing light energy, where fundamental frequency laser energy is produced at a wavelength of from about 1,160 nanometers to about 1,170 nanometers. Portions of the fundamental frequency laser energy are combined to produce a second harmonic frequency laser energy using non-critical phase-matching in a LBO crystal. A portion of the fundamental frequency laser energy is combined with a portion of the second harmonic frequency laser energy to produce a third harmonic frequency laser energy. A portion of the second harmonic frequency laser energy is combined with the third harmonic frequency laser energy to produce a fifth harmonic frequency laser energy using non-critical phase-matching in a CLBO crystal. A portion of the fundamental frequency laser energy is combined with the fifth harmonic frequency laser energy to produce a sixth harmonic frequency laser energy using a CLBO crystal. The sixth harmonic frequency laser energy has a wavelength that is less than about two hundred nanometers.

Abstract: A wavelength conversion laser light source, including a solid-state laser medium configured to generate fundamental light; a wavelength conversion element configured to convert the fundamental light into second harmonic light which has a higher frequency than the fundamental light; and a conductive material in contact with the wavelength conversion element, wherein the wavelength conversion element includes a polarization inverted structure formed with a polarization inversion region, and a first lateral surface which perpendicularly intersects with the polarization inversion region, and the conductive material is in contact with the first lateral surface.

Abstract: An apparatus for producing coherent, pulsed ultraviolet light with pulse durations that range between 1 ps and 1 ?s includes one or more source lasers in the visible or near-infrared frequency range. The apparatus also includes one or more FC stages, at least one of the one or more FC stages including a nonlinear FC device and one or more optical elements. The optical elements include a reflector, a focusing element, a polarization-controlling optic, a wavelength separator, or a fiber optic component. The FC device includes a huntite-type aluminum double borate nonlinear optical material configured to produce FC light having a wavelength between 190 and 350 nm and a composition given by RAl3B4O12, where R comprises one or a plurality of elements {Sc, La, Y, Lu}. The nonlinear optical material is characterized by an optical transmission greater than 70% over the wavelength range of 190 to 350 nm.

Abstract: A laser device is disclosed that provides at least an ultraviolet laser beam and preferably both an ultraviolet laser beam and a visible laser beam. The laser device includes a semiconductor laser device (e.g. a laser diode) to generate visible laser light which is coupled into a frequency doubling crystal taking the form of a single crystal thin film frequency-doubling waveguide structure. The single crystal thin film frequency-doubling waveguide converts a portion of the visible light emitted by the laser diode into ultraviolet light. Both visible and ultraviolet laser light is emitted from the waveguide. As an example, the single crystal thin film frequency-doubling frequency doubling waveguide includes a frequency doubling crystal region composed of ?-BaB2O4 (?-BBO), a cladding region composed of materials that are transparent or nearly transparent at the wavelength of the ultraviolet laser light beam and a supporting substrate composed of any material.

Abstract: A plane waveguide type laser includes: a plate-shaped laser medium; a semiconductor laser which causes excitation light to enter an end surface of the laser medium; first and second claddings which are bonded to lower and upper surfaces of the laser medium, respectively, to form a waveguide in a vertical direction; a comb heat sink bonded to a lower surface of the first cladding; and a thermal lens producing portion bonded to an upper surface of the second cladding. In this structure, laser oscillation in the vertical direction is performed in a waveguide mode of the laser medium, and the thermal lens producing portion forms a periodic lens effect in the laser medium to perform laser oscillation in a lateral direction in a plurality of resonant modes.

Abstract: The present invention relates to a super continuum light source comprising a pump source arranged to emit light having a center wavelength ?center arranged to provide pump pulse to a generator fiber, where the refractive index profile of the core is arranged to allow modal cleaning of the light is it propagates, such as via stimulated Raman scattering. An example of invention is the application of a relatively high power pump laser utilized to provide an optical super continuum with relatively high spectral density and/or good beam quality even though the pump laser may provide a beam with a high M2.

Abstract: A device for irradiating an electromagnetic wave irradiates an electromagnetic wave having a target frequency in a range of 0.1 THz to 30 THz to the outside of a non-linear optical crystal. The device includes a main body composed of a non-linear optical crystal and a sub wavelength grating structure formed on a surface of the main body. The sub wavelength grating structure includes column shaped bodies regularly arranged on a surface of the main body. Each of the column shaped bodies includes a constant width part having a constant width and a base part provided from the surface toward the constant width part. A surface of the base part has a shape of an arc having a center of curvature in the outside of the base part viewed in a cross section of the column shaped body cut along a direction in which the column shaped bodies are arranged.

Abstract: A High-power sum frequency generator system including a first electromagnetic source for generating a first fundamental field and a second fundamental field emitted along a propagation path, and a first nonlinear component and a second nonlinear component arranged in series along the propagation path. The first nonlinear component generates a first sum frequency field from the first fundamental field and the second fundamental field, the first sum frequency field having a first polarization. The second nonlinear component generates a second sum frequency field from the first and second fundamental fields, the second sum frequency field having a second polarization. The system has an output that includes the first sum frequency field and the second sum frequency field, and a direction of the first polarization forms a mutual angle with a direction of the second polarization such that the two polarizations are non-parallel.

Abstract: The invention relates to an optical wavelength conversion device adapted to receive at least one first pump beam (?1) as an input and emitting a different wavelength output beam (?S), which includes: an optical cavity (CE); an optically non-linear medium (CNL) placed inside the optical cavity; and a control system (BA1) for controlling said optical cavity having the wavelength of the first pump beam; said control system being adapted to receive, as an input, a first signal (S1) representing the power stored in the cavity having said first wavelength and a second signal (S2) representing the power of the output beam. The invention also relates to a coherent light source comprising such a device and one or two pump laser sources (L1, L2).

Abstract: A compact source of polarization-entangled photons includes a laser source, producing a laser beam, a pair of nonlinear crystals, in optical contact with each other, with one of the pair of nonlinear crystals having an input face, with the laser beam incident on the input face, and another of the pair of nonlinear crystals rotated 90°, along an axis perpendicular to the input face, with respect to each other and a fiber coupling point, configured to receive a pair of single-mode fibers. Pairs of polarization-entangled photons are produced through spontaneous parametric down conversion of the laser beam and provided to the fiber coupling point.

Abstract: The present invention includes a fundamental laser light source configured to generate fundamental wavelength laser light, a first nonlinear optical crystal configured to generate first alternate wavelength light; a second nonlinear optical crystal configured to generate second alternate wavelength light; a dual wavelength Brewster angle waveplate configured to rotate a polarization of the first alternate wavelength light relative to the second alternate wavelength light such that the first and second alternate wavelength light have the same polarization; a set of Brewster angle wavefront processing optics configured to condition the first and second alternate wavelengths of light; a harmonic separator configured to separate the first alternate wavelength light from the second alternate wavelength light; and a Brewster angle output window configured to transmit the first or second alternate wavelengths of light from the interior of a laser frequency conversion system to the exterior of the laser frequency con

Abstract: A method and device for improved minimally invasive vascular treatments. The method comprises introducing a catheter into a vein to be treated. The catheter is adapted to introduce an energy transmitting member and a fluid into the vein to be treated. The fluid introduced via the catheter can include, but is not limited to: saline solutions, cooled saline solutions, liquids for vapor generation, vasoconstricting agents, anesthetic agents and/or a formulation containing an ingredient which can be activated by the applied energy.

Abstract: Disclosed are methods and apparatus for generating a sub-208 nm laser. A laser apparatus includes one or more seed radiation sources for generating a first radiation beam having a first fundamental wavelength on a first optical path and a second radiation beam having a second fundamental wavelength on a second optical path, a first amplifier for amplifying the first radiation beam, a second amplifier for amplifying the second radiation beam, and a wavelength conversion module comprising a plurality of crystals for frequency multiplying and mixing the amplified first and second radiation beams to produce an output beam at a fifth harmonic that is less than about 208 nm.

Abstract: A method for making a polarization rotator includes the steps of forming a structure including a semiconductor substrate and a mesa part, forming a first semiconductor layer on a main surface of the semiconductor substrate and around the mesa part, forming a second semiconductor layer on the first semiconductor layer, forming a semiconductor laminate by forming a third semiconductor layer on the second semiconductor layer, forming a mask layer on the third semiconductor layer, forming a mesa including a first semiconductor core by etching the semiconductor laminate, and forming a first semiconductor cladding by forming a fourth semiconductor layer around the mesa. The first semiconductor core and the first semiconductor cladding form a polarization rotating unit. An inclined surface of a mesa-part-adjacent portion extends in a second direction forming an acute angle with the main surface. An inclined portion of the second semiconductor layer extends in the second direction.

Abstract: An optical wavelength conversion element includes: a wavelength conversion waveguide that has a periodic polarization reversal structure having alternately and cyclically formed domains of which polarization directions are inverted, that guides light as a fundamental wave corresponding to the periodic polarization reversal structure, and performs a wavelength conversion of the guided fundamental wave; a first clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with the domains; a second clad that is made of a dielectric having a refractive index lower than that of the wavelength conversion waveguide and is provided in contact with the domains such that the second clad is opposed to the first clad film; a first conducting unit that electrically connects the domains in parallel via the first clad; and a second conducting unit that electrically connects the domains in parallel via the second clad.

Abstract: A wavelength conversion laser light source 100 has: a laser light source configured to generate fundamental wave laser light; and a wavelength conversion element 101 provided with a periodic polarization reversal structure configured to convert the fundamental wave laser light which is incident onto the periodic polarization reversal structure into different laser light in wavelength wherein the wavelength conversion element includes different polarization reversal regions in period; and a polarization reversal axis 102 of at least one of the polarization reversal regions is inclined with respect to an incident optical path of the fundamental wave laser light on the wavelength conversion element.

Abstract: The invention relates to scanning pulsed laser systems for optical imaging. Coherent dual scanning laser systems (CDSL) are disclosed and some applications thereof. Various alternatives for implementation are illustrated, including highly integrated configurations. In at least one embodiment a coherent dual scanning laser system (CDSL) includes two passively modelocked fiber oscillators. The oscillators are configured to operate at slightly different repetition rates, such that a difference ?fr in repetition rates is small compared to the values fr1 and fr2 of the repetition rates of the oscillators. The CDSL system also includes a non-linear frequency conversion section optically connected to each oscillator. The section includes a non-linear optical element generating a frequency converted spectral output having a spectral bandwidth and a frequency comb comprising harmonics of the oscillator repetition rates.

Abstract: A gain clamped optical device includes a semiconductor stack and a resonant cavity configured to emit stimulated light. A window created in the optical device is configured to emit the stimulated light in an LED mode.

Abstract: A frequency-doubled OPS-laser having a desired output wavelength of 532 nm is tunable about that wavelength by a temperature tuned birefringent filter (BRF). The temperature of the BRF is varied while measuring transmission of a sample of the output through a Nd:YAG crystal having an absorption peak at a wavelength of about 532.4 nm. The peak is detected as a minimum of transmission and the temperature at which that minimum occurs is recorded. From wavelength-change-versus-temperature data for the BRF a temperature is calculated at which the output wavelength has the desired value and is maintained at that value to stabilize the output wavelength.

Abstract: The invention relates to a device for generating electromagnetic radiation, said device comprised of a light source (1) generating a first radiation (7) at a fundamental wavelength, an optical resonator (2) in which the first radiation (7) circulates, and a frequency multiplier (8) located in the optical resonator (2) which converts the first radiation (7) at least partly into a second radiation (9) at a second or higher harmonic wavelength, wherein the said frequency multiplier (8) comprises at least one non-linear crystal (10). The invention proposes that at least one beam splitter element (12) passed through by the first radiation (7) and the second radiation (9) is coupled to the non-linear crystal (10), wherein the first radiation (7) and the second radiation (9) leave the beam splitter element (12) each in a different spatial direction.

Abstract: A green laser is made by constructing a laser cavity that includes within it a laser diode, a non-linear crystal such as KTP, and a lens. The boundaries of the cavity are not defined by the ends of the diode itself, but are instead defined by the ends of an apparatus that includes the lens and the KTP or similar crystal.

Abstract: A hybrid CW MOPA includes an OPS-laser resonator delivering radiation in a plurality of longitudinal lasing-modes or wavelengths. The multiple longitudinal mode output is amplified in a fiber-amplifier. Amplified lasing-modes from the fiber-amplifier are frequency-converted by an optically nonlinear crystal in a ring-resonator having the same length as the laser resonator, such that the ring-resonator is resonant for all of the amplified lasing-modes.

Abstract: A laser device includes a partially reflective mirror for separating laser light into monitor light and output light, a light output monitor device for detecting the intensity of the monitor light from the partially reflective mirror, a controller for controlling the intensity of the output light from the partially reflective mirror by controlling the output of a laser light source on the basis of a detection value of the light output monitor device, and a power meter device for detecting the intensity of the output light from the partially reflective mirror during a predetermined calibration time period, wherein the controller calibrates the output of the light output monitor device on the basis of a detection value of the power meter device.

Abstract: A system is provided for providing high power, wavelength tunable, laser radiation, the system comprising: a plurality of seeder sources, each the source of the plurality having a different seeder wavelength; a Ytterbium doped amplifier chain, receiving radiation from the plurality of seeder sources and at least one pump source; a second harmonic generator communicating with the Ytterbium doped amplifier chain, the second harmonic generator comprising converting radiation of the seeder wavelength into radiation of a second harmonic wavelength; and wherein the second harmonic generator comprises a crystal having a plurality of grating segments, wherein each grating segment converts radiation of a different wavelength.

Abstract: In aspects of the invention, wavelength conversion element has a harmonic generation portion and a parametric oscillation portion. The harmonic generation portion generates a harmonic of laser light output from a laser light source. The parametric oscillation portion generates signal light and idler light from the harmonic generated by the harmonic generation portion. In some aspects of the invention, electrodes and a first voltage control portion control the intensity of the harmonic generated by the harmonic generation portion. A first FBG (Fiber Bragg Grating) and a second FBG cause resonance of signal light output from the parametric oscillation portion. A piezo tube and a second voltage control portion change the resonance frequency of the first FBG and the second FBG.

Abstract: A light emitting device includes a semiconductor laser, which oscillates in a single longitudinal mode, formed above a semiconductor substrate, a first heater, which controls a temperature of the semiconductor laser, provided near the semiconductor laser, a gain unit, which amplifies a beam outputted from the semiconductor laser and outputs an amplified beam, formed above the semiconductor substrate, a second heater, which controls a temperature of the gain unit, provided near the gain unit, and a second harmonic generation element, which converts the amplified beam outputted from the gain unit to a second harmonic light and outputs the second harmonic light.

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 radiation-emitting device includes a first active semiconductor layer embodied for the emission of electromagnetic radiation and for direct contact with connection electrodes, and a second active semiconductor layer embodied for the emission of electromagnetic radiation and for direct contact with connection electrodes. The first active semiconductor layer and the second active semiconductor layer are arranged in a manner stacked one above another.

Abstract: An apparatus and process using a high-power, short-pulsed thulium laser to output infrared laser pulses delivered through an optical fiber, for cutting and ablating biological tissue. In some embodiments, the pulse length is shortened sufficiently to keep inside the stress-confined ablation region of operation. In some embodiments, the pulse is shortened to near the stress-confined ablation region of operation, while being slightly in the thermal-constrained region of operation. In some embodiments, the laser is coupled to a small low-OH optical fiber (˜100 ?m diameter). In some embodiments, the device has a pulse duration of about 100 ns for efficient ablation; however in some embodiments, this parameter is adjustable.

Abstract: A two-chip OPS laser includes first and second OPS-chips each emitting the same fundamental wavelength in first and second resonators. The first and second resonators are interferometrically combined on a common path terminated by a common end-mirror. The interferometric combination provides for automatic wavelength-locking of the laser, which can eliminate the need for a separate wavelength selective device in the laser.

Abstract: A monolithic laser cavity 1 for use in a diode-pumped solid state laser comprises a pair of mirrors 4, 5, forming input and output ends of the cavity 1. Arranged between the mirrors 4, 5 is an amplifying element 6, a birefringent element 7, an optically isotropic element 8, and a birefringent nonlinear optical element 9. The birefringent element 7 is arranged at an angle to the optical axis of the cavity 1 such that parallel surfaces of the birefringent element 7 act as polarising elements, and such that the birefringent element 7 acts as a first Lyot filter within the laser cavity 1, and the angled birefringent element 7, the birefringent nonlinear optical element 9 and cavity mirror 5 following the birefringent nonlinear optical element 9 together act as a second Lyot filter within the laser cavity 1, thereby providing wavelength selection within the laser cavity 1.

Abstract: A device for generating or receiving electromagnetic radiation in a frequency range from 10 GHz to 100 THz is provided. The device includes a housing and a wave guide fiber leading into the housing. The wave guide fiber is adapted for guiding pulsed laser light with a first central wavelength. Within the housing, a terahertz converter is provided for generating or receiving the electromagnetic radiation in the terahertz range. The device also includes a frequency converter for converting the light exiting from the wave guide fiber to a second central wavelength being arranged between the end of the wave guide fiber and the terahertz converter in such a way that the terahertz converter is impinged by the frequency converted light.

Abstract: A tensegrity apparatus having multiple tensegrity units for the transmission of solitary waves with adjustable profiles into a material or structure, and the detection of such waves from a material or structure.

Abstract: A wavelength conversion laser light source, includes: a solid laser medium; a wavelength conversion element; a concave mirror on which a first reflecting surface reflecting a fundamental light wave and a second harmonic light wave is formed; and a wavelength plate on which a second reflecting surface reflecting the fundamental light wave and transmitting the second harmonic light wave is formed, wherein a laser resonator is constituted by the first reflecting surface and the second reflecting surface; the solid laser medium is arranged on a first reflecting surface side of the laser resonator, the wavelength plate is arranged on a second reflecting surface side of the laser resonator, and the wavelength conversion element is arranged between the solid laser medium and the wavelength plate; and the wavelength plate outputs the second harmonic wave, to the exterior of the laser resonator, via the second reflecting surface.

Abstract: The present application discloses a wavelength conversion device. The wavelength conversion device includes a light source for generating excitation light, a laser medium for generating fundamental light from the excitation light, a resonator mirror for forming a resonator for the fundamental light in cooperation with the laser medium, and a wavelength convertor for converting wavelength from the fundamental light into harmonic light. The wavelength convertor includes a first end surface inclined by an angle ? from a surface orthogonal to an optical axis of the resonator and a second end surface parallel to the first end surface.

Abstract: Pulsed light source comprising pulse generation means (1), such as an optical oscillator, whose output is divided into three arms: two arms (3, 4) to generate a CEP-stable, ultrabroadband idler output; and a third arm (5) to generate a narrowband pump output. The pump output and idler output seed an OPCPA (13), generating stable ultrashort pulses.

Abstract: Improved laser systems and associated techniques generate an ultra-violet (UV) wavelength of approximately 193.368 nm from a fundamental vacuum wavelength near 1064 nm. Preferred embodiments separate out an unconsumed portion of an input wavelength to at least one stage and redirect that unconsumed portion for use in another stage. The improved laser systems and associated techniques result in less expensive, longer life lasers than those currently being used in the industry. These laser systems can be constructed with readily-available, relatively inexpensive components.

Abstract: A second-harmonic generation nonlinear frequency converter includes a nonlinear optical crystal. The nonlinear optical crystal includes a plurality of sections. The sections connect to each other in sequence, and each section has a phase different from others. Each of the phases includes a positive domain and a negative domain. Each of the sections includes a plurality of quasi-phase-matching structures. The quasi-phase-matching structures connect to each other in sequence and have the same phase in one section.