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| Number | Title | Issue Date |
| 5682397 | Er:YALO upconversion laser A laser comprises an upconversion laser gain element made of a crystalline xide host doped with activator ions for emitting output radiation at an output wavelength. The gain element is pumped by pumping radiation at a pumping wavelength that is longer tha... | 10/28/1997 |
| 5638397 | Confocal-to-concentric diode pumped laser A high power diode pumped, acousto-optically Q-switched Nd:YVO4 laser includes at least one resonator mirror and an output coupler defining a resonator cavity. At least one acousto-optic Q-switch device and at least one laser crystal, with stro... | 06/10/1997 |
| 5621745 | Intracavity modulated pulsed laser and methods of using the same An intracavity modulated pulsed laser and methods of using the same. In one preferred form, an intracavity modulated pulsed laser comprises an amplification medium, a pulsed pumping source, a beam modulator, and two mirrors, one totally reflective and one... | 04/15/1997 |
| 5610933 | Flashlamp-pumped Ho:Tm:Cr:LuAG laser A room temperature solid-state laser is provided. A laser crystal is disposed in a laser cavity. The laser crystal has a LuAG host material doped with a concentration of about 0.35% Ho ions, about 5.57% Tm ions and at least about 1.01% Cr ions. A broadban... | 03/11/1997 |
| 5521930 | Device for injection-seeding, frequency-shifting, and q-switching a laser source This invention is an optical device for laser sources, particularly for injection-seeded laser sources. The invention is an acousto-optic element used within a laser cavity to satisfy three functions--injection-seeding, frequency-shifting, and Q-switching... | 05/28/1996 |
| 5465171 | Optical modulator device using a thin film resonator An optical modulator device comprised of a semiconductor laser acoustically coupled to a thin film resonator is disclosed herein. The thin film resonator includes a piezoelectric crystal layer having first and second opposing surfaces, with the first oppo... | 11/07/1995 |
| 5452313 | Optical feedback eliminator Deleterious feedback reflections from a power amplifier into a laser master oscillator are eliminated by interposing a nonreciprocal frequency shifter between the oscillator and amplifier, which shifts the laser frequency by more than twice the bandwidth ... | 09/19/1995 |
| 5452314 | Controllable-birefringence, acousto-optic tunable filter and a laser tuned by the same An acousto-optic tunable filter ("AOTF") with a pair of electrodes on opposite sides of the waveguide. A voltage source applies a potential across the electrodes, thereby creating an electric field through the waveguide. The electric field controls an opt... | 09/19/1995 |
| 5450427 | Technique for the generation of optical pulses in modelocked lasers by dispersive control of the oscillation pulse width The invention relates to modelocked lasers including highly dispersive optical elements. The dispersive optical elements increase the oscillation pulse width inside the laser oscillators, which reduces the nonlinearity of the laser cavity for a given osci... | 09/12/1995 |
| 5434875 | Low cost, high average power, high brightness solid state laser A high average power, high brightness solid state laser system. A laser produces a first pulse laser beam with a high pulse frequency. A pulse spacing selector removes from the first pulse laser beam more than 80 percent of the pulses to produce a second ... | 07/18/1995 |
| 5418805 | Device for pumping the active medium of a white light laser A polychromatic or white light laser arrangement for changing the dimensions of the pumped portions of the active medium is realized by employing an optical divider for dividing the pump radiation into at least two beamlets, and one or more lenses for foc... | 05/23/1995 |
| 5416298 | Laser engraving apparatus An apparatus for preparing a medium for use in a printing process supports the medium (2) for rotation about an axis. A head (6) is mounted for movement parallel to the axis and includes means to direct a laser beam onto the surface of the medium. The las... | 05/16/1995 |
| 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 generating at least one laser output burst comprising a plurality... | 02/14/1995 |
| 5388111 | Process for the production of an acoustooptical cell for a switched laser, the cell obtained, process for the collective production of switched microchip lasers and microchip lasers obtained Process for the production of an acoustooptical cell for a switched laser, the cell obtained, process for the production of microchip lasers having acoustooptical switching means and the microchip lasers obtained. A wafer is etched in order to bring about... | 02/07/1995 |
| 5384799 | Frequency stabilized laser with electronic tunable external cavity Method and arrangement for locking a laser to an external cavity that is electronically tunable to provide an optical source that is highly coherent and which is frequency stabilized over a variable frequency range. Preferably, an injection laser is tight... | 01/24/1995 |
| 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 remaining portion of the working beam with a high power pum... | 12/13/1994 |
| 5271025 | Mode-locked upconversion laser source A laser source which operated under the principals of cooperative unconversion produces controllable optical pulses at wavelengths which are shorter than the wavelength of the laser energy which pumps the gain medium. The source is a solid-state laser whi... | 12/14/1993 |
| 5268912 | Harmonic light source capable of being optically modulated and optical information processing apparatus employing the same There is disclosed a harmonic light source which comprises: a laser light source for radiating a pumping laser beam; a laser active medium for performing a laser oscillation by receiving the laser beam from said laser light source, a resonator being forme... | 12/07/1993 |
| 5268911 | X-cut crystal quartz acousto-optic modulator An acousto-optical laser modulator includes an X-cut crystal quartz block. A transducer, such as a piezoelectric device, is coupled to the block. An electrical signal provided to the transducer causes the transducer to vibrate. The vibrations propagate th... | 12/07/1993 |
| 5263037 | Optical oscillator sweeper An electrically tunable optical oscillator. An acoustooptically tunable filter is located in a feedback path of an optical oscillator. The filter non-collinearly diffracts the light signal to selectively tune the oscillator. In one embodiment the light si... | 11/16/1993 |
| 5197074 | Multi-function intra-resonator loss modulator and method of operating same A laser system is provided with a multi-function intra-resonator loss modulator to generate laser output having selectable amplitude within a relatively wide amplitude range and selectable duration within a relatively wide duration range while preserving ... | 03/23/1993 |
| 5193096 | Acousto-optic Q-switched solid state laser A Q-switched solid state laser provided with a laser medium, a pump source for generating pumping light used to pump the laser medium, a pair of laser resonance mirrors respectively placed at both sides of the laser medium and a Q-switching acousto-optica... | 03/09/1993 |
| 5175737 | Cavity referenced acousto-optical laser frequency stabilization The CAVITY REFERENCED ACOUSTO-OPTICAL LASER FREQUENCY STABILIZATION shown here locks the frequency of a laser 10 to that of a reference cavity 26. It frequency modulates the input 24 to the cavity 26 with an acouto-optical modulator 18 which operates on a... | 12/29/1992 |
| 5159406 | Light-operated accelerometer-type techniques A laser based accelerometer system uses small motion induced shifts in frequency to measure the motion of an object without contact thereof. This technique is particularly useful for determining the vibratory and velocity characteristics of objects that a... | 10/27/1992 |
| 5157677 | Single frequency, long tail solid state laser interferometer system A single frequency solid state laser has been designed for generation of a high power Q-switch pulse followed by a quasi-CW low power tail by properly controlling the laser resonator transmission via an intracavity Q-switch. The generation of a stable sin... | 10/20/1992 |
| 5153888 | Optical laser frequency stabilizer An optical laser frequency stabilizer which is simple, inexpensive, produces an unmodulated output, and a highly controlled oscillation frequency, wherein signals supplied to a master laser are modulated with a signal which is switched between four or mor... | 10/06/1992 |
| 5153771 | Coherent light modulation and detector A acousto-optic Fabry-Perot optical modulator (10) has a crystalline body (12) having a first partially reflective electrode (14) for receiving radiation, including laser radiation having a wavelength or wavelengths of interest, and a second, oppositely d... | 10/06/1992 |
| 5151909 | Frequency doubled solid state laser having programmable pump power modes and method for controllable lasers A laser system using non-linear crystals for second harmonic generation and solid state gain media is operated under data processor control so that a plurality of pump power modes are available. The data processor modulates the pump power in a low power m... | 09/29/1992 |
| 5130995 | Laser with Brewster angled-surface Q-switch alinged co-axially A miniature laser cavity in which a solid-state lasing gain element and a Q-switch have respective end surfaces at substantially the Brewster angle, parallel to and facing each other, and separated by a narrow gap occupied by a transparent low-index-of-re... | 07/14/1992 |
| 5121245 | Laser system incorporating an acousto-optic device having reduced susceptibility to stress-induced birefringence The present invention is a laser system that includes an acousto-optic device (24B) having an optical medium (40B) that maintains a substantially uniform index of refraction even when subjected to nonuniform thermal or mechanical stress. The acousto-optic... | 06/09/1992 |
| 5022033 | Ring laser having an output at a single frequency A ring laser is disclosed that produces a single frequency of laser radiation in either the pulsed mode of operation or the continuous waveform (cw) mode of operation. The laser comprises a ring laser in a bowtie configuration, a birefringent gain materia... | 06/04/1991 |
| 4998254 | Stabilized synchronously pumped dye laser A length stabilized, dispersion compensated synchronously pumped mode locked dye laser is disclosed. The output of the dye laser is actively stabilized by monitoring the output power thereof and generating an error signal for actively adjusting the cavity... | 03/05/1991 |
| 4979176 | Acousto-optical device with lithium tantalate transducer An acousto-optical device includes a solid state substrate having optical characteristics affected by an acoustic wave in the substrate, and a Z-cut lithium tantalate transducer coupled to the substrate for inducing the acoustic wave. Lithium tantalate pr... | 12/18/1990 |
| 4965803 | Room-temperature, laser diode-pumped, q-switched, 2 micron, thulium-doped, solid state laser A room-temperature, laser-pumped, Q-switched, thulium-doped, solid state laser for producing pulses of laser emission at substantially 2 microns is disclosed. In a preferred embodiment, the laser comprises: a laser cavity defined by first and second refle... | 10/23/1990 |
| 4945539 | Acousto-optic tunable filter An acousto-optic tunable filter, for laser tuning, comprises an acoustic transducer connected to one face of an anisotropic crystal or Bragg cell which is cut at such an angle relative to its optic axis that an acoustic wave projected into the crystal nor... | 07/31/1990 |
| 4933945 | Arrangement for converting the frequency of a laser beam The invention is directed to a laser arrangement for converting frequency wherein the fundamental frequency or the converted frequency can be selectively emitted by means of an optical element which can be pivoted into and out of the beam path. An especia... | 06/12/1990 |
| 4932031 | Chromium-doped foresterite laser system A laser system in which the laser medium is a single crystal of Cr3+ :Mg2 SiO4 is disclosed. In one embodiment, the system comprises a single crystal of chromium doped forsterite and a cavity which includes a pair of 30 cm... | 06/05/1990 |
| 4928284 | Laser power control system A laser power beam control system includes a photodetector for generating an electrical signal which is proportional to the power level of the laser beam. The electrical signal is converted to a high frequency modulated signal which controls a single acou... | 05/22/1990 |
| 4912716 | Method and apparatus for frequency modulation stabilization of a laser A microwave oscillator frequency modulates the output of the laser system to be controlled. The modulated output passes through a molecular gas cell. The output of the molecular gas cell is detected by a square law device, which produces a signal at the d... | 03/27/1990 |
| 4872177 | Laser diode pumped solid state laser A neodymium or other rare earth doped solid state laser is pumped by a matched high efficiency laser diode, including a diode array and a multi-spatial mode extended emitter diode, resulting in a compact, high efficiency and long lifetime laser assembly. ... | 10/03/1989 |
