Laser with grating feedback unstable resonator
OF PREFERRED EMBODIMENTS The essence of the present invention is the use of one or more curved optical spatial gratings in a semiconductor laser, or other laser capable of accepting such gratings, to... Read More
Inventors: Pepper, David M.; Craig, Richard R.;, Assignee: Hughes Aircraft Company (Los Angeles, CA) |
Narrow-bandwidth unstable resonator laser cavity
It is one object of this invention to provide an unstable resonator laser cavity that produces laser radiation characterized by high power, diffraction-limited divergence and narrow-bandwidth. Another... Read More
Inventors: Cooper, David G.; Reintjes, John F.; Tankersley, Lawrence L.; Dexter, James L.;, Assignee: United States of America as represented by the Secretary of the Navy (Washington, DC) |
Laser resonator
We claim: 1. A laser resonator for a carbon dioxide laser, comprising two resonator mirrors placed on ends of an excitable active medium, at least one of the resonator mirrors having at least two full... Read More
Inventors: Du, Keming; Loosen, Peter;, Assignee: Fraunhoefer-Gesellschaft zur Foerderung der Angewandten Forschung e.V. (DE) |
Narrow-band laser apparatus
The present invention has been developed in order to provide a narrow-band laser apparatus, in particular an excimer laser apparatus, which is capable of emitting radiation of very narrow bandwidth wi... Read More
Inventors: Basting, Dirk; Kleinschmidt, Jurgen;, Assignee: Lambda Physik Gesellschaft Zur Herstellung Von Lasern mbH (DE) |
Apparatus and method for driving diffraction gratings
It is an object of this invention to provide a grating drive apparatus for use in a multiple-grating optical spectrometer that both exchanges gratings and operates the spectrometer using a single moto... Read More
Inventors: Zhou, Andy; Aubry, Thierry; Belsky, James; Rebello, Jagdish; Slutter, Steven; Katzenberger, Joseph;, Assignee: Instruments S.A., Inc. (Edison, NJ) |
External cavity type wavelength-tunable light source
The present invention has been made to overcome the above problems, and it is an object of the present invention to provide an external cavity type wavelength-tunable light source in which a wavelengt... Read More
Inventors: Maeda, Minoru;, Assignee: Ando Electric Co., LTD. (Tokyo, JP) |
Spread spectrum communication synchronization acquisition decoding apparatus
The present invention has been implemented to solve the above problem, and has an object to provide a spread spectrum communication synchronization acquisition demodulating apparatus in which a proper... Read More
Inventors: Komatsu, Masahiro;, Assignee: NEC Corporation (JP) |
Gas laser with acoustic baffle
I claim: 1. In a gas laser having a resonant cavity, an active gas medium, and energy extracting means, the combination comprising a generally cylindrical baffle formed of insulating material position... Read More
Inventors: Nazemi, Said;, Assignee: Laser Science, Inc. (Cambridge, MA) |
X-ray frequency down converter
OF THE DRAWINGS Referring first to FIGS. 1 and 2, there is shown therein a flat, relatively thin excimer laser structure. The laser structure consists of a flat, thin cavity 20 defined between top wa... Read More
Inventors: Birnbach, Curtis; Tanner, Jay;, Assignee: Quantum Diagnostics Ltd. (Hauppauge, NY) |
Misalignment-tolerant, grating-tuned external-cavity laser with enhanced longitudinal mode selectivity
The present invention overcomes the foregoing problems by rearranging the optical elements in the optical relay so that the cylindrical lens does not reduce the mode selectivity. In this system the cy... Read More
Inventors: Zorabedian, Paul;, Assignee: Hewlett-Packard Company (Palo Alto, CA) |
Process for forming metal films by plasma sputtering
Therefore, a first object of the present invention is to provide a process for efficiently forming metal films being high in reflectivity and good in adhesion to synthetic resin substrates regardless ... Read More
Inventors: Matsumaru, Shigeo; Watanabe, Toru; Kubotsu, Akira; Nogawa, Shuichi; Ogata, Kiyoshi; Inoue, Daisuke;, Assignee: Nissin Electric Co., (Kyoto, JP); Kuraray Co., Ltd. (Okayama, JP) |
Planar waveguide spectrograph
The present invention provides a spectrograph that is well suited to serve as a demultiplexer/detector in a WDM system. The spectrograph receives an optical input signal, and detects the optical energ... Read More
Inventors: Beranek, Mark W.; Capron, Barbara A.; Huggins, Raymond W.; Griffith, David M.; Livezy, Darrell L.; Traynor, Timothy;, Assignee: The Boeing Company (Seattle, WA) |
Method and apparatus for determining the velocity of a gas flow
It is an object of this invention to provide a method and apparatus for determining the velocity of a gas flow that does not require the seeding of the gas flow. It is a further object of this inventi... Read More
Inventors: Pitz, Robert W.; DeBarber, Peter A.; Brown, III, Thomas M.;, Assignee: Vanderbilt University (Nashville, TN) |
F2 laser with visible red and IR control
The present invention provides a reliable, modular, production quality F.sub.2 excimer laser capable of producing, at repetition rates in the range of 1,000 to 2,000 Hz or greater, laser pulses with p... Read More
Inventors: Onkels, Eckehard D.; Sandstrom, Richard L.; Duffey, Thomas P.;, Assignee: Cymer, Inc. (San Diego, CA) |
Method and apparatus for measuring ultrashort optical pulses
This invention relates to a method and apparatus for measuring changes in shapes and wavelength (frequency) at various sections of ultrashort optical pulses. In the past, these changes have not been c... Read More
Inventors: Naganuma, Kazunori; Noda, Juichi;, Assignee: Nippon Telegraph and Telephone Corporation (Tokyo, JP) |
Apparatus for measurement of an optical pulse shape
It is therefore an object of the present invention to provide an apparatus for measurement of an optical pulse shape that is able to measure the real waveform of an ultrashort optical pulse by transfo... Read More
Inventors: Lee, Hak Kyu; Lim, Dong Sung; Jeon, Min Yong; Ahn, Joon Tae; Kim, Kyong Hon;, Assignee: Electronics and Telecommunications Research Institute (Daejon-Shi, KR) |
Laser rod pump chamber and method
I claim: 1. A method for mounting a laser rod to a laser rod tube, comprising: inserting an end of a laser rod, having an outer diameter, into an end portion of a laser rod tube, the end portion havin... Read More
Inventors: Edwards, Glyn;, Assignee: GSI Lumonics Ltd. (Rugby, GB) |
Binocular microscope with improved monocular photographic and measuring capability using movable objective
We claim: 1. A stereomicroscope comprising a main objective and twin variable magnification optical systems arranged for stereoscopic viewing through said main objective and further comprising means f... Read More
Inventors: Schulz, Luitpold; Schaefer, Andreas;, Assignee: Wild Heerbrugg Aktiengesellschaft (Heerbrugg, CH) |
Reactive power control system
It is an object of the invention to realize an improved control of reactive power generated in a power system. Another object is to make it possible to keep a stable voltage in a power system. The for... Read More
Inventors: Nakamura, Koji;, Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP) |
Dynamic braking of direct current motors
I claim: 1. A dynamic braking system for a D.C. motor, including: (I) a unidirectional series circuit comprising (a) a D.C. motor armature, (b) a first controllable D.C. power source having a permanen... Read More
Inventors: Markham, John David;, Assignee: Associated Electrical Industries Limited (London, EN) |
Dynamic braking of direct current motors
I claim: 1. A dynamic braking system for a D.C. motor, the system comprising a undirectional current path including a controllable current source, a motor armature and a brake resistance, said brake r... Read More
Inventors: Markham, John D.;, Assignee: Associated Electrical Industries Limited (GB2) |
Dynamic brake control
Among the several objects of the present invention may be noted the provision of a dynamic brake control for AC motors and an improved method of regulating dynamic braking resistances which overcome t... Read More
Inventors: D'Atre, John D.; Giewont, William P.;, Assignee: General Electric Company (Charlottesville, VA) |
Method of protecting motor against overload and motor control device
In view of the foregoing drawbacks, it is thus a purpose of the present invention to provide a method of protecting a motor against an overload and a motor control device therefor, which permits for d... Read More
Inventors: Ogasawara, Hiromitsu;, Assignee: TACHI-S Co., Ltd. (Akishima, JP) |
Device for operating a gas-discharge lamp
It is the object of the invention to reduce the reactions of the starting pulse emitted by the starting member to the power member. This object and other objects are attained by a device of the type f... Read More
Inventors: Vogel, Manfred; Drews, Ulrich; Herden, Werner; Konrad, Johann; Gerhard, Albert;, Assignee: Robert Bosch GmbH (Stuttgart, DE) |
Forced commutation power converter arrangement in reverse voltage free circuit configuration
Therefore, with the foregoing in mind it is a primary object of the present invention to provide a new and improved construction of forced commutation static power or current converter arrangement in ... Read More
Inventors: Kommissari, Karl;, Assignee: BBC Brown, Boveri & Co. Ltd. (Baden, CH) |
Selective commutation for an inverter
We claim: 1. A selective commutation circuit for use with an inverter which transforms DC electrical energy from a source providing a negative input and a positive input to AC electrical energy at an ... Read More
Inventors: Moriarty, Robert M.; Walton, John W.; Caldwell, Samuel C.;, Assignee: United Technologies Corporation (Hartford, CT) |
Four-terminal unity power factor electronic rectifier
Accordingly, a main object of the present invention is to provide a self-contained rectifier module which operates at unity power factor and which is simpler to use in a circuit It is also an object o... Read More
Inventors: Pelly, Brian R.;, Assignee: International Rectifier Corporation (El Segundo, CA) |
Dual mode control of a PWM motor drive for current limiting
The invention involves a method and a control circuit for switching between sine-triangle modulation and hysteresis modulation in a PWM drive to overcome the problems discussed above. The invention re... Read More
Inventors: McNaughton, Larry S.;, Assignee: Allen-Bradley Company, Inc. (Milwaukee, WI) |
Air purity monitoring system
In brief, arrangements in accordance with the present invention constitute a system for detecting and measuring the concentrations of contaminants in compressed air. Such systems utilize particular co... Read More
Inventors: Lamoreaux, Charles L.;, Assignee: |
System for microscopically analyzing fluids
An object of the present invention is to provide apparatus for microscopically analyzing fluids. A further object of the invention is to provide apparatus that will enable urinalysis to be performed r... Read More
Inventors: Greenfield, Walter;, Assignee: Scientific Imaging Instruments, Inc. (Fairfield, CT) |
Control Computers 
