Celebrity Inventors
Mark Twain (Samuel L. Clemens) received Patent No. 121,992 for "An Improvement in Adjustable and Detachable Straps for Garments." He later received two more patents: one for a self-pasting scrapbook and one for a game to help players remember important historical dates.
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| Number | Title | Issue Date |
| 4856010 | Laser frequency control A radio frequency excited carbon dioxide laser (50) is stabilized by sensing (66) variation in output power to generate a feedback signal (68,78 ) that is employed to vary amplitude of the radio frequency exciting signal from a power source (62). Frequenc... | 08/08/1989 |
| 4853935 | Frequency stabilization of gas lasers A gas laser 10 has a gas-field enclosure 12 in which electrodes 14, 16 are operable to excite the gas within the enclosure to emit laser radiation. The region 20 between the electrodes 14, 16 contains a plasma which emits the laser radiation. At one end o... | 08/01/1989 |
| 4841529 | System for generating a stable optical frequency A system for generating a stable optical frequency from a laser signal having inherent frequency fluctuations. The signal from an injection-controlled pulsed laser is divided into two parts. One part is mixed with the signal from a stable CW laser to gene... | 06/20/1989 |
| 4835779 | Method and apparatus for the operation of a distributed feedback laser There are disclosed a method and apparatus for producing laser pulses at two wavelengths alternately by switching the oscillations of a distributed feedback semiconductor laser of the continuous grating type back and forth across the stop band. The necess... | 05/30/1989 |
| 4835782 | Method and apparatus for an oscillation frequency separation among a plurality of laser devices There are disclosed a method and apparatus for stabilizing an oscillation frequency separation among a plurality of laser devices wherein a plurality of laser devices are controlled to radiate output lights each having a predetermined frequency so that a ... | 05/30/1989 |
| 4827480 | Method and apparatus for generating ultra-short pulses with a frequency shifter in a cavity This invention relates to an improved method for producing pulsed trains of light within a cavity which comprises repeatedly incrementally increasing the frequency of a constant wave of light circulating within the cavity and combining the frequency-shift... | 05/02/1989 |
| 4819240 | Light modulator A light modulator for modulating data signal to high frequency light signal includes a semiconductor laser diode having an input for receiving the data signal and an output for producing a laser beam, a light detector for receiving the laser beam and prod... | 04/04/1989 |
| 4819242 | Semiconductor laser driver circuit A low-laser-noise semiconductor driver device is provided for use in an optical information processing device which is recordable or erasable and which oscillates a semiconductor laser with a high output when it is recorded or erased. A semiconductor is g... | 04/04/1989 |
| 4817099 | Generation of stable frequency radiation at an optical frequency A system for generating a stable optical frequency from a laser signal having inherent frequency fluctuations. The signal from a injection-controlled pulsed laser is divided into two parts. One part is mixed with the signal from a stable CW laser to gener... | 03/28/1989 |
| 4817105 | Integrated laser device with refractive index modulator The present invention provides a laser device comprising a substrate; an active layer; a multi-quantum-well layer disposed on one side of the active layer and optically coupled therewith; a diffraction grating layer disposed on a side of the active layer ... | 03/28/1989 |
| 4817100 | Monitoring and controlling source stability A method and apparatus for monitoring and/or controlling the frequency of a beam of coherent radiation. The apparatus comprises a reference source (1) which is controlled to generate reference radiation beam with a frequency which is repeatedly swept thro... | 03/28/1989 |
| 4815085 | System for generating stable laser pulses A system for generating a stable optical frequency from a laser signal having inherent frequency fluctuations. The signal from an injection-controlled pulsed laser is divided into two parts. One part is mixed with the signal from a stable CW laser to gene... | 03/21/1989 |
| 4812682 | Simultaneous all-optical logical operations using the third order nonlinear optical effect and a single waveguide Spatial modulation representing digital information is imposed on a pump laser beam, and differing modulation representing different digital information is imposed on a second light beam which has a frequency equal to the pump beam less the nonlinear opti... | 03/14/1989 |
| 4769820 | Means for and method of improving transmission of a data carrying laser beam At the receiving end or point at which a data or information carrying seed laser beam is to be received after traveling through a medium, a pump laser beam is propagated through the medium to the sending end of the medium at which point the now aberrated ... | 09/06/1988 |
| 4745606 | Dual-wavelength laser apparatus A dual-wavelength laser apparatus includes a laser emitting a laser beam consisting of two wavelength components, a methane cell for controlling and equalizing gains of the two wavelength components, a cavity length modulator including a piezoelectric ele... | 05/17/1988 |
| 4736382 | Acousto-optical laser isolator An acousto-optical isolator for isolating unwanted, backwardly propagating laser beams. The isolator includes a first Bragg cell to shift the frequency of a desired, forwardly propagating beam by a first step, a second Bragg cell to shift the frequency by... | 04/05/1988 |
| 4733397 | Resonant cavity optical modulator A phase-matched resonant waveguide modulator suitable for very high frequency modulation and applications such as FM laser spectroscopy is described. The width of a crystal modulator section of the waveguide is chosen so that the operating frequency is ju... | 03/22/1988 |
| 4720835 | Integrated semiconductor light emitting element with oscillation wavelength and phase modulated light output A semiconductor light emitting element is disclosed, which is provided with a light emitting region having a diffraction grating formed by periodic corrugations, a modulation region having an external waveguide layer optically connected directly to the li... | 01/19/1988 |
| 4707835 | Rapid wavelength switching of IR lasers with Bragg cells Apparatus is provided for rapidly switching among discrete wavelengths within the output spectrum of a gas laser. A portion of the radiation in a primary optical cavity of a laser is transmitted by a partially reflective surface into a secondary cavity wh... | 11/17/1987 |
| 4701924 | Frequency discriminating laser A laser which discriminates against a high gain transition in laser materials allowing a low gain transition to oscillate is provided by using more than two mirrors in the laser cavity which are highly reflective at the frequency of the high gain transiti... | 10/20/1987 |
| 4700352 | FSK laser transmitting apparatus In an FSK laser transmitting apparatus, a light source can change the output light frequency. A driver performs FSK of the light source with a plurality of values. A beam splitter splits the output light from the light source into two split beams. A delay... | 10/13/1987 |
| 4666295 | Linear FM chirp laser A laser radar system employing a linear FM chirp laser followed by post detection pulse compression by a surface acoustic wave (SAW) device. The system includes an FM chirp modulator that provides the needed tuning range and linearity for pulse compressio... | 05/19/1987 |
| 4660206 | Chirp laser stabilization system A chirp laser system includes an intracavity electro-optical crystal modulated at a relatively high frequency, for example 250 kilohertz, to sweep the frequency of the transmitter laser above and below its nominal center frequency. One of the mirrors of t... | 04/21/1987 |
| 4646313 | Inert gas ion laser A miniaturized inert gas ion laser is proposed whose discharge column has a diameter between 6×10-3 cm and 8×10-2 cm. In a preferred embodiment, a BeO plate is enclosed by two metal parts which lie against one of the base areas of ... | 02/24/1987 |
| 4644556 | Extended laser sensor An extended laser sensor including a laser with an opticla gain lasing medium optically coupled to an optical resonant cavity including reference and sensor arms. Optical path length variations in the sensor arm induced by an incident physical field modul... | 02/17/1987 |
| 4638483 | High speed intensity modulated light source A semiconductor laser is frequency modulated and the output is put through an FM to IM converter. Intensity modulation is obtained at high frequency with the use of low switching current and minimal chirping oscillations.... | 01/20/1987 |
| 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 |
| 4606031 | Device for frequency modulation of a laser output spectrum A device is provided for fast frequency modulating the output spectrum of multimode lasers and single frequency lasers that are not actively stabilized. A piezoelectric transducer attached to a laser cavity mirror is driven in an unconventional manner to ... | 08/12/1986 |
| 4592058 | Frequency stabilized laser A frequency control system for a laser for compensating for thermally-induced laser resonator length changes. The frequency control loop comprises a frequency reference for producing an error signal and electrical means to move a length-controlling transd... | 05/27/1986 |
| 4590597 | Modulation transfer spectroscopy for stabilizing lasers A method and apparatus are disclosed for precisely stabilizing a laser to a sub-Doppler resonance of an absorbing gas contained in a cell located external to the laser resonator. Stabilization is based on the detection of modulation transferred onto a pre... | 05/20/1986 |
| 4590596 | Method and apparatus for modulating a diffraction radiation generator Method and apparatus for modulating coherent radiation generated by an orotron in accordance with a low voltage control signal applied to the diffraction grating to vary the grating-to-cathode voltage from the cathode-to-collector voltage over a selected ... | 05/20/1986 |
| 4586184 | Acoustically controlled frequency shifted cavity for electromagnetic radiation A frequency shifted cavity apparatus for electromagnetic radiation. The cavity filters electromagnetic radiation wherein the instantaneous frequency increases and changes non-linearly in time. The cavity can optionally include an optical amplifier with su... | 04/29/1986 |
| 4571576 | High speed analog-to-digital converter An analog-to-digital converter using a frequency tunable laser having output radiation of a frequency determined by the input voltage to the laser is described.... | 02/18/1986 |
| 4562579 | Light beam modulating and deflecting system A light beam modulating and deflecting system comprising a stationary electrode secured to a stationary body, and a rotatable electrode secured to a rotating body, on which a light source is mounted, and opposed in slightly spaced relation to the stationa... | 12/31/1985 |
| 4559500 | Mirror-grating tuning arrangement for high resolution lasers A tuning arrangement (10) for a tunable laser comprises a single holographic grating (12) and two flat surface reflective mirrors (13 and 14). The beam (15) from the laser cavity is incident on the grating at a grazing angle for optimum beam expansion. Th... | 12/17/1985 |
| 4556980 | Laser light sources A light source comprises a semiconductor laser and a gas laser. The semiconductor laser is injection locked using the highly coherent output from the gas laser. The output from the semiconductor laser has a narrow linewidth and a high stability. The inven... | 12/03/1985 |
| 4546458 | Frequency modulated laser diode A method of modulating the output of a solid state diode laser by directly straining the laser chip. The chip is mechanically coupled to a transducer such as a piezoelectric crystal in such a manner that a dimensional variation in the transducer is transl... | 10/08/1985 |
| 4528669 | Combined AM/FM laser radar transmitter A laser radar transmitter (2) has, associated with a single active lasing region (11) and preferably in the same laser cavity (1) therewith, an amplitude modulator (21) and a frequency modulator (25), which may simultaneously place continuous AM and conti... | 07/09/1985 |
| 4512021 | Passively Q-switched square bore waveguide laser A waveguide laser having a square bore and an external modulator has its power doubled by proper relationship of a coupled cavity external to a cavity in the waveguide medium.... | 04/16/1985 |
| 4485474 | Injection laser modulator with external resonator An injection laser is provided with a modulator which includes an external resonator cavity including a lithium niobate crystal and a spherical mirror closely coupled to the rear end of the laser with a source of bias voltage for selectively tuning the re... | 11/27/1984 |
