Robert Blake Lieberman

US Patent:

7016589, Mar 21, 2006

Filed:

May 19, 2000

Appl. No.:

09/574840

Inventors:

Edgar A. Mendoza - Redondo Beach CA, US
Lothar U. Kempen - Redondo Beach CA, US
Robert A. Lieberman - Torrance CA, US

Assignee:

Optinetrics, Inc. - Torrance CA

International Classification:

G02B 6/10

US Classification:

385132, 385 14, 385 37

Abstract:

A photosensitive sol-gel film containing an organometallic photosensitizer is deposited on the oxide containing surface layer of a silicon substrate. A pattern of white or ultra violet light incident to the photosensitive sol-gel film results in the unbinding of the photosensitizer from the exposed regions of the sol-gel film. A subsequent succession of first and second heating steps results in, first, the removal of the photo sensitizer constituents from the exposed regions of the sol-gel film and, second, the removal of the organic constituents from the exposed regions, resulting in regions doped with a metal oxide with non linear optical properties, such as semicondutive, electro-optic, magneto-optic, etc. properties. Optical switches, couplers, waveguides, splitters, interferometers wavelength division multiplexer, Bragg gratings and more can be fabricated.

US Patent:

7283717, Oct 16, 2007

Filed:

Mar 21, 2006

Appl. No.:

11/386515

Inventors:

Edgar A. Mendoza - Redondo Beach CA, US
Lothar U. Kempen - Redondo Beach CA, US
Robert A. Lieberman - Torrance CA, US

Assignee:

Optinetrics, Inc. - Torrance CA

International Classification:

G02B 6/10

US Classification:

385132, 385 14, 385 37

Abstract:

A photosensitive sol-gel film containing an organometallic photosensitizer is deposited on the oxide containing surface layer of a silicon substrate. A pattern of white or ultra violet light incident to the photosensitive sol-gel film results in the unbinding of the photosensitizer from the exposed regions of the sol-gel film. A subsequent succession of first and second heating steps results in, first, the removal of the photo sensitizer constituents from the exposed regions of the sol-gel film and, second, the removal of the organic constituents from the exposed regions, resulting in regions doped with a metal oxide with non linear optical properties, such as semicondutive, etc. properties. Optical switches, couplers, waveguides, splitters, interferometers wavelength division multiplexer, Bragg gratings and more can be fabricated. A glass substrate also may be employed, instead of a silicon, in which case a separate silicon oxide surface layer is unnecessary.

US Patent:

7496267, Feb 24, 2009

Filed:

Oct 16, 2007

Appl. No.:

11/975030

Inventors:

Edgar A. Mendoza - Redondo Beach CA, US
Lothar U. Kempen - Redondo Beach CA, US
Robert A. Lieberman - Torrance CA, US

International Classification:

G02B 6/10

US Classification:

385132, 385 14, 385 17

Abstract:

A photosensitive sol-gel film containing an organometallic photosensitizer is deposited on the oxide containing surface layer of a silicon substrate. A pattern of white or ultra violet light incident to the photosensitive sol-gel film results in the unbinding of the photosensitizer from the exposed regions of the sol-gel film. A subsequent succession of first and second heating steps results in, first, the removal of the photo sensitizer constituents from the exposed regions of the sol-gel film and, second, the removal of the organic constituents from the exposed regions, resulting in regions doped with a metal oxide with non linear optical properties, such as semicondutive, etc. properties. Optical switches, couplers, waveguides, splitters, interferometers wavelength division multiplexer, Bragg gratings and more can be fabricated. A glass substrate also may be employed, instead of a silicon, in which case a separate silicon oxide surface layer is unnecessary.

US Patent:

62019120, Mar 13, 2001

Filed:

Nov 5, 1999

Appl. No.:

9/434225

Inventors:

Lothar U. Kempen - Redondo Beach CA
John D. Prohaska - Torrance CA
Robert A. Lieberman - Torrance CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G02B 634

US Classification:

385 37

Abstract:

A sensor system comprises a broadband light source, a birefringent sensor, a detection circuit, and a signal processing unit. The preferred detection circuit further includes a variable frequency oscillator, a modulator, and a photodetector. The modulator modulates the output of the birefringent sensor with a modulation signal from the variable frequency oscillator. The modulation produces an interference signal having a variable interference frequency. By determining the frequency of the modulation signal from the variable frequency oscillator that minimizes the interference frequency, the detection system is able to determine the difference in frequency between first and second spectral components of the output of birefringent sensor. The detector may be constructed using entirely solid state optics/electronics. The preferred fiber grating sensor comprises a birefringent optical fiber having a cladding and a core.

US Patent:

60142154, Jan 11, 2000

Filed:

Apr 14, 1998

Appl. No.:

9/059872

Inventors:

Lothar U. Kempen - Redondo Beach CA
John D. Prohaska - Torrance CA
Robert A. Lieberman - Torrance CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G01B 902

US Classification:

356345

Abstract:

A fiber optic sensor system comprises an optical fiber, a first reflector and a second reflector. The first reflector provides a fixed reference for measuring the optical path length between the second reflector and a reference reflector. The first and second reflectors respectively receive first and second portions of light emitted by the optical fiber and then reflect the light back to the optical fiber. The optical path length between the first and second reflectors varies in accordance with a sensed parameter. In operation, first and second interferograms are acquired that are produced by the interference of light reflected from the first and second reflectors with light reflected from a reference reflector. The first and second interferograms are then used to determine an optical path length between first and second reflectors. Finally, the optical path length between the first and second reflectors is used to determine the value of the sensed parameter.

US Patent:

59947071, Nov 30, 1999

Filed:

Mar 18, 1997

Appl. No.:

8/819050

Inventors:

Edgar A. Mendoza - Redondo Beach CA
James E. Sorenson - Onyx CA
Robert A. Lieberman - Torrance CA
Thomas C. Forrester - Monrovia CA

Assignee:

Physical Optics Corporation - Torrance CA

International Classification:

G01N 2164

US Classification:

2504581

Abstract:

A low cost portable fiber optic fluorometer is packaged as a personal computer peripheral and is based on interchangeable modules. One embodiment of the fluorometer comprises an excitation source, a detector, a signal processor, frequency source, wavelength selector, and an optical interface. The optical interface is exclusively fiber optic-based, thereby simplifying optical alignment and reducing the cost of the fluorometer. In another embodiment, the excitation source is an inexpensive monochromatic excitation source. In this case, the monochromatic excitation source and the first wavelength selector are preferably removable and replaceable, so that the fluorometer is advantageously able to generate different excitation wavelengths and detect different emission wavelengths. A fluorescence measurement method comprises the steps of generating an excitation signal; transmitting the excitation signal to a system under study which, in response, generates an emission signal; and detecting both the excitation signal and the emission signal with the fluorometer, and then using the detected excitation signal as a reference signal to calibrate the fluorometer and to nullify distortion errors in the emission signal. The use of the excitation signal as a reference signal provides an advantageously simple way to calibrate the fluorometer and to nullify distortion errors in the emission signal.