David A Cohn, 6620294 Lorenzana Dr, Woodland Hills, CA 91364

6516008, Feb 4, 2003

Aug 9, 2000

09/634216

David B. Cohn - Torrance CA

Raytheon Company - Lexington MA

H01S 310

372 22, 372 23, 359 28

A wavelength conversion system and method. The inventive system is adapted to receive a beam of input energy having a first spiked portion with a first wavelength and a first spatial and/or temporal intensity profile and a second tail portion with the first wavelength and a second spatial and/or temporal intensity profile. The inventive system includes an electro-optic switch ( ) and first polarizer ( ) for directing the first portion of the input beam along a first processing path ( ) and a second portion thereof along a second processing path ( ). A first SHG/OPO arrangement ( ) is disposed in the first path ( ) for shifting the wavelength of the first portion of the input energy from the first wavelength to a second wavelength. The first arrangement is optimized for the first spatial and/or temporal intensity profile of the first portion of the energy. A second SHG/OPO arrangement ( ) is disposed in the second path for shifting the wavelength of the second portion of the input energy from the first wavelength to the second wavelength.

8223815, Jul 17, 2012

Jul 29, 2010

12/846422

David B. Cohn - Torrance CA, US

DBC Technology Corp. - Torrance CA

H01S 3/22
H01S 3/223
H01S 3/097

372 58, 372 55, 372 57, 372 83

A COgas flow laser with multiple discharge modules places acoustic baffles between the discharge modules to suppress shock waves and ions passing between the discharge modules such as may disrupt the optical path of the laser. A catalyst may be placed in a center of a toroidal recirculation chamber of the laser and may have integrated filters to prevent catalyst particulates from coating the chamber optical windows.

8416828, Apr 9, 2013

Oct 8, 2010

12/901260

David B. Cohn - Torrance CA, US

DBC Technology Corp. - Torrance CA

H01S 3/22

372 59, 372 55

An array of discrete catalyst elements is contained in a heated module external to the main laser vessel with an auxiliary gas flow loop connecting them so as to provide independent control of catalyst temperature and gas flow rate to achieve high CO+1/2Oto COrecombination under high pulse repetition frequency operation for a sealed laser. Catalyst elements in the form of cylinders with holes through their centers are mounted on multiple parallel rods or catalysts in the form of small spherical or cylindrical elements are contained in multiple packets arranged in the module so as to minimize flow impedance and maximize laser gas recycling throughput. The cylindrical catalyst module is constructed so as to allow for rapid heating to operating temperature while withstanding atmospheric differential pressures during laser processing.

2012019, Aug 2, 2012

Jan 31, 2011

13/017739

David B. Cohn - Torrance CA, US

H01S 3/03

372 61

Multiple independent electrode sets of a COgas laser are arranged in series within a single optical resonator with each electrode set energized by an independent power source. The total length of the electrode sets together and their maximum power are optimized for output energy at the weakest laser wavelength, and one or several of the independent electrode sets is turned off and/or their power reduced to achieve laser output on strong lines without damage to the laser optics. The total resonator length is chosen to produce an output laser beam with single transverse mode.

6100698, Aug 8, 2000

Jun 17, 1997

8/877542

Clifford A. Megerle - Thousand Oaks CA
David B. Cohn - Torrance CA

G01N 2762

324464

A chemical sensor comprising a gas detector having first and second printed wiring boards with opposed separated pairs of signal and grounded counter electrodes and processing electronics for processing ionic current signals derived from the signal and counter electrodes. A corona discharge source is provided that produces an ionized air stream containing a chemical that is to be detected. An insulating plate is disposed between the second printed wiring board of the gas detector and the corona discharge source that is used to electrically isolate the electrodes and processing electronics of the gas detector from the corona discharge source. An air flow passage is formed through the corona discharge source, the insulating plate, and the gas detector that allows the ionized air stream generated by the corona discharge source to flow past the signal and counter electrodes, so that the chemical may be detected.

4990761, Feb 5, 1991

Nov 30, 1988

7/277814

David B. Cohn - Torrance CA
Michael P. Hasselbeck - Redondo Beach CA
Gregory R. Sasaki - Long Beach CA

Hughes Aircraft Company - Los Angeles CA

G01J 120

2502021

A radiation protection system is operative within an optical section of a radiation imaging system for protection of an array of detectors of the radiation. The protection system is formed of one or more spark boards arranged in series along a path of radiation propagation, the spark boards having a central window through which the radiation propagates. On a front side of each spark board are arranged a set of electrodes disposed about a periphery of the window. Ground pads are disposed on a back side of each board in registration with the electrodes on the front side to form therewith a set of capacitors. A capacitive-discharge power-supply circuit is connected to a first pair of electrodes in a first one of said boards. In the presence of excessive incident radiation power, a capacitor of the power supply circuit is switched to apply a high voltage across said first pair of electrodes, the voltage being high enough to initiate an arc across the window in said first board. The capacitors and electrodes are connected serially to allow a current of one arc to charge a succeeding capacitor which, upon being charged, initiates a further arc in a process which continues until all arcs have been struck.

5020069, May 28, 1991

Dec 18, 1989

7/452141

John A. McNeil - Los Angeles CA
David B. Cohn - Torrance CA

Hughes Aircraft Company - Los Angeles CA

H01S 322
B01J 2344

372 59

A catalyst for reacting carbon monoxide and oxygen to form carbon dioxide, comprising platinum black deposited on a platinum wire, and having a moderate activation temperature of about 150. degree. -300. degree. C. A catalytic apparatus includes this catalyst, means for directly heating the catalyst, and electronic means for controlling and monitoring the heating of the catalyst. Carbon dioxide laser systems incorporating this catalytic apparatus are also disclosed.

4380079, Apr 12, 1983

Sep 12, 1980

6/186663

David E. Cohn - Los Angeles CA
Eugene E. Conley - Huntington Beach CA

Northrop Corp. - Los Angeles CA

H01S 3093

372 87

A gas laser having preionization means which comprises an elongated glass tube extending beside the glow discharge volume for the length of the laser cavity, there being a central conductor inside the tube and a conductive strip or spaced strips bonded to the outside of the tube. The inner wire and outer strip are connected respectively to the same high voltage pulse leads which provide the main laser discharge. Ultraviolet radiation from the conductive strips on the tube preionizes the laser gas and creates a stable uniform laser electric discharge.