John M Walling

US Patent:

20060278897, Dec 14, 2006

Filed:

Jun 9, 2006

Appl. No.:

11/423325

Inventors:

Donald Heller - Bound Brook NJ, US
Brian Pryor - Ewing NJ, US
John Walling - Whitehouse Station NJ, US

International Classification:

H01L 29/768

US Classification:

257222000

Abstract:

A device for measuring optical power simultaneously for two or more spectral regions. Two or more photodetectors, such as photodiodes, measure the pulse energy and/or power emitted by a laser having output in two or more spectral regions. The laser radiation is transmitted through a diffuser or beamsplitter, then filtered and/or attenuated so that light from each respective spectral region is incident on the active region of a photodiode. The device also includes electronic circuitry with one or more operational amplifiers for each photodiode, integrators and analog-to-digital converters. In a preferred embodiment, the device also includes a microprocessor to provide noise reduction and calibration functions for each photodiode output, and to drive a display or readout.

US Patent:

42727332, Jun 9, 1981

Filed:

May 29, 1979

Appl. No.:

6/043513

Inventors:

John C. Walling - Morristown NJ
Robert C. Morris - Ledgewood NJ
Otis G. Peterson - Dover NJ
Hans P. Jenssen - Belmont MA

Assignee:

Allied Chemical Corporation - Morris Township, Morris County NJ

International Classification:

H01S 314

US Classification:

331 945F

Abstract:

A high power, broadly wavelength-tunable laser is provided which comprises as the laser medium particular single crystals of chromium-doped beryllium aluminate (BeAl. sub. 2 O. sub. 4 :Cr. sup. 3+) having the chrysoberyl structure, means for exciting the laser medium and tuning means. The laser may be operated over a broad temperature range from cryogenic temperatures to elevated temperatures. Elevated temperatures are preferred, however, since they result in higher laser gain. Emission is in a spectral range from red to infrared, and the laser is useful in the fields of defense, communications, isotope separation, photochemistry, etc. CROSS-REFERENCE TO PRIOR APPLICATION This application is a continuation-in-part of application Ser. No. 953,067, filed Oct. 20, 1978.

US Patent:

50714163, Dec 10, 1991

Filed:

May 2, 1990

Appl. No.:

7/517762

Inventors:

Donald F. Heller - Warren NJ
John C. Walling - White House Station NJ
Robert S. Anderson - Livermore CA

Assignee:

Metalaser Technologies, Inc. - Pleasanton CA

International Classification:

A61B 600

US Classification:

606 3

Abstract:

A laser beam from a tunable solid state laser such as an alexandrite laser passes through a Raman shifter to produce a Raman-emitted beam with wavelength shifted so as to be able to activate a preselected photosensitizer for medical treatment. A combination of a laser and a Raman shifter with or without additionally a harmonic generator such as a frequency doubler may be also selected such that radiation with two different wavelengths can be obtained for treatment and detection.