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...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 4740975 | Congruently melting complex oxides The invention involves the finding that the congruent composition of any complex oxide is non-stoichiometric.... | 04/26/1988 |
| 4739507 | Diode end pumped laser and harmonic generator using same A second harmonic, optical generator is disclosed in which a laser diode produces an output pumping beam which is focused by means of a graded, refractive index rod lens into a rod of lasant material, such as Nd:YAG, disposed within an optical resonator t... | 04/19/1988 |
| 4731795 | Solid state laser An optically pumped solid state laser which is constructed of components held in association by a support structure which is configured to receive the components and automatically arrange them with respect to one another along an optical path.... | 03/15/1988 |
| 4731787 | Monolithic phasematched laser harmonic generator A monolithic phasematched harmonic generator is obtained by optically pumping an optically nonlinear lasant member having reflective faces defining the monolithic optical resonator. Phasematching is achieved, in one case, by inclining a totally internally... | 03/15/1988 |
| 4701929 | 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, resulting in a compact, high efficiency and long lifetime laser assembly. Output is in the near infrared range, but can be converted to the visible... | 10/20/1987 |
| 4697100 | Deuterated L-arginine phosphate monohydrate The new crystal deuterated l-arginine phosphate monohydrate provides an excellent frequency conversion crystal for laser applications, especially in the one micron wavelength region.... | 09/29/1987 |
| 4656635 | 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, resulting in a compact, high efficiency and long lifetime laser assembly. Output is in the near infrared range, but can be converted to the visible... | 04/07/1987 |
| 4653056 | Nd-YAG laser A neodymium YAG laser is pumped by a matched laser diode of high efficiency, resulting in a compact, high-efficiency and long-lifetime laser assembly. Output is in the near infrared range, but can be converted to the visible spectrum by an internal freque... | 03/24/1987 |
| 4646308 | Synchronously pumped dye laser using ultrashort pump pulses The output of a continuous wave modelocked Nd:YAG laser is first pulse compressed and then frequency doubled from infrared to green, to provide a new pumping source for a synchronously pumped dye laser. The disclosed apparatus and methods can achieve tuna... | 02/24/1987 |
| 4637026 | Frequency doubling a Q-switched laser beam by using intracavity Type II phase matching A frequency doubler for a Q-switched laser is disclosed in which a Type II SHG crystal is oriented to generate a second harmonic frequency beam in response to the orthogonal components of a fundamental beam. After the fundamental beam makes a round trip t... | 01/13/1987 |
| 4618783 | Production of short light pulses by time compression Mono-pulses of light are generated by time compression of laser energy. A Raman medium is located in a low Q energy storage cavity having low losses for light at a predetermined frequency and energy delivered by a laser is that frequency in the storage ca... | 10/21/1986 |
| 4618957 | Frequency doubling a laser beam by using intracavity type II phase matching A frequency doubler for a laser is disclosed in which a Type II SHG crystal is oriented to generate a second harmonic frequency beam in response to the orthogonal components of a fundamental beam. After the fundamental beam makes a round trip through the ... | 10/21/1986 |
| 4617666 | Frequency doubling a laser beam by using intracavity type II phase matching A frequency doubler for a laser is disclosed in which a Type II SHG crystal is oriented to generate a second harmonic frequency beam in response to the orthogonal components of a fundamental beam. After the fundamental beam makes a round trip through the ... | 10/14/1986 |
| 4577122 | Method and apparatus for generation of coherent VUV and XUV radiation A pulsed free expansion jet of gas interacts with a high energy laser beam pulse to develop higher order odd harmonics of the laser beam. The pulsed jet of gas is introduced into a vacuum chamber so that the gas expands at a supersonic rate. As the pulsed... | 03/18/1986 |
| 4567596 | Laser apparatus A harmonic amplifier for a laser beam amplifies a harmonic frequency of the beam. The amplifier generates a series of electric fields across the beam, successive fields being directed oppositely. The spacing between the fields is related to the speed of p... | 01/28/1986 |
| 4510402 | Optical harmonic generator A pair of uniaxial birefringent crystal elements are fixed together to form a serially arranged, integral assembly which, alternatively, provides either a linearly or elliptically polarized second-harmonic output wave or a linearly polarized third-harmoni... | 04/09/1985 |
| 4413342 | Method and apparatus for frequency doubling a laser beam A method and apparatus for providing coincident orthogonally-polarized laser beams having twice the frequency of a fundamental frequency emitted by a laser source is disclosed. A second harmonic generator within a laser resonator cavity causes frequency-d... | 11/01/1983 |
| 4397025 | Dual frequency laser A method and apparatus for operating a dual-frequency gas laser so as to controllably switch between frequencies makes use of a cavity so tuned that the comb of resonant frequencies is not commensurate with the frequency difference between the laser opera... | 08/02/1983 |
| 4386428 | Tripled Nd:YAG Pumped Tm3+ laser oscillator Multiple frequency, visible laser outputs are obtained from a 1064 nanometer input by tripling the output of an Nd:YAG laser and using the 355 nanometer radiation for downconversion by pumping a Tm:LiYF4 crystal.... | 05/31/1983 |
| 4260957 | Use of multiple beams from frequency augmented laser radiation A system for making optimum use of frequency shifted radiation by extracting both front and back travelling frequency shifted radiation beams. The two extracted laser beams are later combined in the same polarization for energization of a dye laser channe... | 04/07/1981 |
| 4194168 | Unidirectional ring laser apparatus and method Ring configuration dye laser capable of supporting laser oscillations in the form of backward and forward running waves and including unidirectional polarization shifter for causing preferential oscillation of one of said waves in unidirectional, single f... | 03/18/1980 |
| 4181899 | High power optical second harmonic generation in non-linear crystals Harmonic generation in a nonlinear crystal, arising out of high power optical energy produced by a neodymium-doped glass laser operating at 1.06 micrometers wavelength, is normally limited by crystal self-heating due to thermal-optical effects that cause ... | 01/01/1980 |
| 4181900 | Laser pumping assembly A laser pumping assembly with a housing having a removable heat resistant glass liner or shell enclosing a pump and a laser rod comprises removable glass or quartz plates over opposite ends of the shell together with a heat absorbing shim between each end... | 01/01/1980 |
| 4170763 | Conductively cooled laser pumping assembly An improved conductively cooled laser pumping assembly comprises a metallic housing having an elliptically shaped bore in which a pump lamp and laser rod are supported along the respective focal axes of the bore. The laser rod is mounted on the tapered en... | 10/09/1979 |
| 4127827 | Optimized mode-locked, frequency doubled laser In a solid state, folded cavity, laser having a fundamental frequency and a second harmonic frequency, the efficiency of the laser is improved by placing a quarter wave plate, at the lower frequency, in the leg of the cavity containing the lasing element ... | 11/28/1978 |
| 4107544 | Two-photon resonant laser mixing in molecular liquids Liquid mixtures are used as the active medium in two-photon resonant four-wave mixing processes to achieve efficient nonlinear conversion of infrared laser frequencies. The resonant energy levels involved in these four-wave mixing processes are Raman-acti... | 08/15/1978 |
| 4068190 | Laser system having frequency doubling A laser system for ocean radar applications having a resonant chamber for producing a pair of homogenized, singularly polarized output beams having identical pulse widths and energies. A quarter wave plate is inserted within the optical path of the resona... | 01/10/1978 |
| 4048515 | Broadband laser with intracavity crystal for generating second harmonic radiation High power, high efficiency second harmonic generation is obtained by employing a nonlinear optical crystal inside the cavity of a broadband laser. The birefringent property of the crystal and the nonlinear parametric interaction produce frequency doublin... | 09/13/1977 |
| 4044316 | Stabilized cavity-dumped nd:yag laser In cavity dumped state lasers the relaxation oscillations caused by cavity dumping are stabilized and damped out by placing a non-linear second-harmonic generation crystal inside the optical cavity of the laser and phase-matching it to produce a doubled f... | 08/23/1977 |
| 4041323 | Non-linear optical frequency doubling devices A non-linear optical frequency doubling device comprised of a laser means producing infrared light and crystal optically connected therewith for receiving such light and doubling the frequency thereof. The crystal is composed of M[Hg (SCN)4 ] w... | 08/09/1977 |
| 4019159 | Optical frequency doubler using electro-optic crystal with improved feedback control of crystal phase match An optical frequency doubling arrangement is disclosed in which the indices of refraction of light in a frequency doubling electro-optic crystal are controlled by both electric field pulses applied across the crystal and heater control pulses for controll... | 04/19/1977 |
| 3975693 | Dual function laser for space laser communications A Nd:YAG laser operating in a dual functioning cavity with a Ba2 Na(NbO3)5 frequency doubling crystal provides two frequencies of laser radiation, one frequency double the other, to provide a laser beacon beam at a wavelen... | 08/17/1976 |
| 3967212 | Flash lamp pumped dye laser An optical cavity for a flash lamp pumped dye laser including a pumping cavity, a birefringent filter and a plurality of frequency doubling crystals. Within the pumping cavity the flash lamp is cooled by forced air convection and operated with a D.C. simm... | 06/29/1976 |
| 3947688 | Method of generating tunable coherent ultraviolet light at wavelengths below 2500 A A method for obtaining efficient production of short-wavelength, continuously-tunable ultraviolet light by parametric mixing of optical frequency radiation in a nonlinear crystal. The method involves mixing the second harmonic of a tunable, visible-wavele... | 03/30/1976 |
| 3947780 | Acoustooptic mode-locker frequency doubler An improved laser construction having relatively simple single element means located in the laser cavity for simultaneously mode-locking and frequency doubling the laser output, said single element means including a crystal such as a non-linear barium sod... | 03/30/1976 |
