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5420876 |
Gadolinium vanadate laser
An intracavity frequency-doubled solid-state laser uses a Nd:GdVO 4 laser gain chip to generate a beam of visible laser light which may have wavelengths substantially in the green portion of the...
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5418810 |
Laser light beam generating apparatus using an electromagnetic actuator for reflector positioning
A laser light beam generating apparatus includes at least one light beam source, first and second reflectors, a non-linear optical crystal element and an actuator. The light beam source emits a...
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5418802 |
Frequency tunable waveguide extended cavity laser
A frequency tunable waveguide extended cavity laser formed with a laser diode, a channel waveguide comprising an electro-optic material, a frequency tunable Bragg grating reflector formed in or on...
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5412676 |
Method and apparatus for the determination of the relative frequency offset between an input optical signal and a resonance frequency of an optical cavity
A method and apparatus for stabilizing the relative frequency offset between a laser and a resonant optical cavity is described. Detected spatial mode patterns excited in a coupled nearly confocal...
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5412674 |
Compact rapidly modulatable diode-pumped visible laser
An apparatus for producing rapidly modulated coherent optical emission is described in which a doubly resonant cavity produces amplitude modulated sum frequency generation. The configuration of the...
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5410561 |
Optical wavelength converter for obtaining wavelength conversion efficiency
A wavelength converter having the light source formed of the semiconductor laser 1 and the nonlinear optical element 2, wherein, the oscillation light therefrom is incident to the nonlinear optical...
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5408481 |
Intracavity sum frequency generation using a tunable laser containing an active mirror
A means for intracavity sum frequency generation is described in which a er operates simultaneously, cw, at two wavelengths where the net gain at one wavelength is substantially lower than that at...
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5408110 |
Second-harmonic generation in semiconductor heterostructures
Quasi-phase matched (QPM) second-harmonic (SH) generation in the reflection geometry is described. The SH intensity can be strongly enhanced by spatially modulating the optical properties of the...
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5406408 |
Intracavity-doubled tunable optical parametric oscillator
A Ti:sapphire-pumped intracavity-doubled optical parametric oscillator generates up to 240 mW of sub100 femtosecond pulses tunable in the visible. The OPO consists of a 1.5 mm thick KTP crystal...
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5406575 |
Semiconductor heterostructure laser
The semiconductor heterostructure laser includes a semiconductor substrate, a multilayered light emitting region and an active nonlinear waveguide. The multilayered light emitting region serves as...
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5402407 |
Optical pickup apparatus and method for adjusting optical axis thereof
A method for the optical axis of an optical pickup apparatus includes the step of adjusting the optical axis of a beam expander for enlarging the diameter of a light beam outgoing from a laser...
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5402437 |
Microchip laser
A gain medium is disposed between two mirrors to form a resonant cavity. The cavity length is selected so that the gain bandwidth of the gain medium is less than or substantially equal to the...
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5394411 |
Method for producing high intensity optical through x-ray waveguide and applications
Optical guiding of intense laser pulses over a distance of more than one Rayleigh length in a plasma is discussed herein using a multi-pulse technique. The first pulse or pulse sequence prepares a...
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5394414 |
Laser system and method having a nonlinear crystal resonator
A laser system uses a nonlinear crystal ring resonator to produce Type II nonlinear second harmonic generated light. The reflective surfaces of the resonator are oriented to form two closed beam...
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5394413 |
Passively Q-switched picosecond microlaser
An apparatus and method for a passively Q-switched microlaser for producing high-peak-power pulses of light of extremely short duration are disclosed. The apparatus comprises a gain medium and...
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5390204 |
Intracavity modulated pulsed laser with a variably controllable modulation frequency
An intracavity modulated pulsed laser comprising an amplification medium, a pulsed pumping source, a beam modulator, and two mirrors, one totally reflective and one partially reflective for...
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5390201 |
Self-frequency-doubler laser element
A self-frequency-doubler laser element having a three-dimensional optical waveguide includes a first transparent insulating substrate having both a DFB grating and a grating reflector formed on one...
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5390210 |
Semiconductor laser that generates second harmonic light with attached nonlinear crystal
A semiconductor laser with a nonlinear crystal that generates second harmonic light at a frequency which is twice the fundamental frequency of the laser. The laser is configured in a...
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5390211 |
Optical parametric oscillator with unstable resonator
A high powered OPO system which produces a substantially collimated, low divergence output beam is based on the use of an unstable resonator. An optical parametric gain medium, such as beta-barium...
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5388114 |
Miniaturized self-Q-switched frequency-doubled laser
A diode-pumped monolithic laser is fabricated from a self-doubling host material co-doped with two ionic species, where one ionic dopant converts pump radiation to continuous radiation at a...
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5387998 |
Shorter wavelength light generating apparatus in which coherent light is converted into shorter wavelength light
A shorter wavelength light generating apparatus consists of a semiconductor laser for initially radiating various modes of coherent light including a required mode of coherent light, a reflection...
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5388113 |
Laser generating apparatus
A sum frequency conversion efficiency can be improved and operation can be stabilized. A laser generating apparatus comprises a nonlinear optical element (3) for generating a sum frequency light...
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5384803 |
Laser wave mixing and harmonic generation of laser beams
Producing high efficiency laser wave mixing and laser harmonic generation laser beams by reconstruction of fundamental and second harmonic laser beams from a frequency doubling crystal by use of a...
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5384796 |
Second harmonic generating method and apparatus thereof
A method and apparatus for second harmonic generation of laser light includes a non-linear birefringent crystalline element and a dynamic laser rod which has two transmission faces and an optical...
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5384797 |
Monolithic multi-wavelength laser diode array
A monolithic multi-wavelength laser diode array having a composite active region of at least two dissimilar quantum well layers that are partially mixed in at least one of their constituent atomic...
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5383209 |
Second harmonic generator
A second harmonic generator (SHG) for generating second harmonics from a non-linear bifringent crystalline material of a resonator utilizes a brewster plate within the laser cavity instead of a...
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5381430 |
Optical wavelength converting apparatus
An optical wavelength converting apparatus comprises an optical wavelength converting device, which is constituted of a crystal of a nonlinear optical material and converts a wavelength of an...
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5381428 |
Tunable ytterbium-doped solid state laser
A tunable ytterbium-doped solid-state laser has a laser cavity defined a r of mirrors, a laser medium positioned in this cavity, means for pumping the laser medium, and means for tuning the output...
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5377212 |
Solid-state laser device including uniaxial laser crystal emitting linearly polarized fundamental wave and nonlinear optical crystal emitting linearly polarized harmonic wave
A short-wavelength laser having a stable output and an optical information processing system capable of high-density recording are disclosed. A solid-state laser is used as a light source, and a...
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5373526 |
Apparatus and method for optical energy amplification using two-beam coupling
A diffraction limited working beam at a given frequency is amplified without degrading its diffraction limited quality by diverting a minor portion of the beam as a probe beam, and amplifying the...
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5363390 |
Semiconductor laser that generates second harmonic light by means of a nonlinear crystal in the laser cavity
A surface-emitting laser with an integral nonlinear crystal. The laser generates light at a fundamental frequency. The nonlinear crystal converts the light into light at twice the fundamental...
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5361268 |
Switchable two-wavelength frequency-converting laser system and power control therefor
A laser system and power control have a polarization state changer that produces in response to an incident beam with selected polarization state at a first wavelength λ 1 a beam at λ 1 with a...
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5361275 |
Apparatus for removing material from a target
In order to improve an apparatus for removing material from a target, comprising a high-power laser generating laser pulses with a pulse duration in the picosecond range and comprising a resonator,...
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5357533 |
Frequency doubler and laser source
The wavelength tolerance of a frequency doubler is enhanced so as to perform stable operation. Further, with the use of this frequency doubler, a laser source can directly modulate a laser. A...
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5351250 |
Optical beam steering device
An optical beam steering device (10) incorporates a laser (12), three Brillouin shifters (22 to 26, 44 to 48, 54 to 58), a four wave mixing cell (40) and a low power beam steering device (62). The...
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5345457 |
Dual wavelength laser system with intracavity sum frequency mixing
A dual-wavelength laser system with intracavity, sum-frequency mixing including a bifurcated resonant cavity having a first arm, a second arm and a common arm; a first laser element located in the...
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5345456 |
Spatially addressable surface emission sum frequency device
An active surface-emitting harmonic generator based on a multilayer Al x Ga 1 -x As non linear waveguide integrated monlithically with a tunable InGaAs single quantum well laser is provided....
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5343484 |
SHG (second-harmonic generation) device
An SHG device wherein a channel is formed on a part of a waveguide layer; and the thickness of the waveguide layer is set so that the refractive index of the channel for a fundamental is greater...
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5341236 |
Nonlinear optical wavelength converters with feedback
An optical frequency conversion apparatus includes at least one resonator (10) having an optical path defined by a plurality of mirrors (M1, M2). A nonlinear conversion medium (10a) is disposed...
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5339324 |
Laser beam generator including automatic resonator length control
A laser beam generator for making wavelength conversion automatically controls the length of an external resonator of a laser source to perform wavelength conversion at a high efficiency by...
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5333142 |
Technique for intracavity sum frequency generation
A means for intracavity sum frequency generation is described in which a laser operates simultaneously at two wavelengths. The laser resonator further contains a sum frequency generating nonlinear...
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5331650 |
Light source device and optical pickup using light source device
An SHG element has a semiconductor laser, and a laser resonator for exciting an oscillation line having a predetermined wavelength by making a light beam emitted from the semiconductor laser...
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5325380 |
Dual wavelength laser emitter
A dual-wavelength laser emitter is provided for emitting a dual-wavelength laser beam. The laser emitter includes a first laser beam source for generating a first laser beam having a first...
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5321709 |
Pulsed intracavity nonlinear optical frequency converter
A method for efficiently controlling sum frequency mixing and second harmonic generation within Q-switched laser oscillators. A nonlinear crystal is placed at either the intersection point of two...
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5317447 |
High-power, compact, diode-pumped, tunable laser
A high-power semiconductor diode laser or array of semiconductor diode lasers (14) optically end-pumps a compact, tunable, solid-state laser (28) with a pumping beam (74) well-matched to the...
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5307359 |
Monolithic semi-conductor laser producing blue, green and red output wavelengths
A monolithic multi-color laser comprising a semiconductor laser formed on a substrate for lightwave generation. Means is provided for exciting the laser and means is provided on the substrate...
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5303250 |
Laser light generating apparatus
A laser light generating apparatus comprises a light source for generating an exciting light beam, a condenser lens for converging the exciting light beam from the light source, a laser medium for...
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5303247 |
Optical harmonic generating device for generating harmonic wave from fundamental wave and shorter wavelength laser generating apparatus in which fundamental wave of laser is converted to harmonic wave with the device
An optical harmonic generating device is provided with reverse polarization layers which are made of non-linear optical crystal polarized in a lower direction and are periodically arranged at...
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5301059 |
Short-wavelength light generating apparatus
A short-wavelength light generating apparatus comprising a pumping semiconductor laser and an intra-cavity solid state laser, the intra-cavity solid state laser is excited in response to a laser...
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5297156 |
Method and apparatus for dual resonant laser upconversion
A laser frequency conversion device employs a dual resonant optical cavity in which closed optical paths exist for both the pump beam and the generated beam. The optical cavity is designed so that...
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