William Paul Risk Deceased109 Eunice Ave, Mountain View, CA 94040

2008008, Apr 17, 2008

Oct 12, 2006

11/546626

Annette Claire Grot - Cupertino CA, US
Geoffrey William Burr - Cupertino CA, US
William Paul Risk - Mountain View CA, US

G02B 6/42
G02B 6/26
G02B 6/00
G02B 6/10

385 31, 385 39, 385129, 385122, 385141, 385142

Photonic crystal apparatus and a method for fabricating a photonic crystal apparatus. The photonic crystal apparatus includes a photonic crystal having a dielectric body formed of a first dielectric material having relatively high index of refraction, and a periodic lattice in the dielectric body formed of a second dielectric material having a relatively low index of refraction. The second dielectric material comprises a solid-state dielectric material having a dielectric coefficient of about 2.7 or lower for providing a relatively large contrast between the index of refraction of the dielectric body and the index of refraction of the periodic lattice.

4781425, Nov 1, 1988

Feb 18, 1966

6/830457

William P. Risk - Palo Alto CA
Gordon S. Kino - Stanford CA

The Board of Trustees of the Leland Stanford Junior University - Stanford CA

G02F 111

350 9615

An acousto-optic frequency shifter having a long interaction region is used as an optical analyzer. A variable frequency signal generator is used to drive an acoustic transducer to launch an acoustic wave in contact with an optical fiber. The acoustic frequency is varied over a known range to generate acoustic waves having known wavelengths. An optical signal having an unknown optical wavelength is introduced into one end of the optical fiber in a first polarization mode. The effect of the acoustic wave on the optical signal is to cause coupling of the optical signal from the first polarization mode to a second orthogonal polarization mode. The amount of the coupling is dependent upon the phase-matching between the acoustic wavelength and the optical beat length. The coupling between the polarization modes is maximum when the acoustic wavelength is equal to the optical beat length. The intensity of the optical signal coupled to the second polarization mode can be measured to determine the optical wavelength corresponding to the acoustic wavelength when the maximum intensity occurs.

5095491, Mar 10, 1992

Apr 12, 1991

7/685306

William J. Kozlovsky - Mountain View CA
William P. Risk - Mountain View CA

International Business Machines Corporation - Armonk NY

H01S 3083

372 94

A laser system uses a nonlinear ring resonator to produce Type-II nonlinear second harmonic generated light. The reflective surfaces of the resonator are all symmetrical with respect to the crystal axes. This allows orthogonally polarized light to be resonated along the same beampath in the resonator without experiencing bireflection.

4735485, Apr 5, 1988

Feb 17, 1984

6/581176

Herbert J. Shaw - Stanford CA
Robert C. Youngquist - Montain View CA
Gordon S. Kino - Stanford CA
William P. Risk - Redwood City CA

The Board of Trustees of the Leland Stanford Junior University - Stanford CA

G02B 602
G02F 111
B32B 3100

350 9629

A fiber optic frequency shifter comprises an optical fiber having two propagation modes and an acoustic transducer for generating an acoustic wave. The transducer is positioned relative to the fiber to cause the wave fronts of the acoustic wave to acoustically contact the fiber at an angle of incidence which is less than 90. degree. greater than 0. degree. Preferably, the wavelength of the acoustic wave is substantially equal to the beat length of the fiber times the sine of the angle of incidence.

4735476, Apr 5, 1988

Sep 18, 1985

6/777205

Brian L. Heffner - Menlo Park CA
Gordon S. Kino - Stanford CA
William P. Risk - Palo Alto CA
Butrus Khuri-Yakub - Palo Alto CA

Board of Trustees of the Leland Stanford Junior University - Stanford CA

G02B 610

350 9613

A Bragg cell device for use as a tap in optical systems. In one embodiment an acoustic transducer is secured to a surface of an acoustic transmission medium, which is adjustably secured in hertzian contact with a surface of a waveguide. Bulk acoustic waves at frequencies above about 1 GHz are transmitted from the transducer through the transmission medium into the waveguide along a propagation path wherein the acoustic wavefronts intersect a light path in the waveguide at an angle which satisfies Bragg conditions, producing deflection of light out of the light path. Preferably, the transmission medium is also an optical conductor and is oriented upon the waveguide to receive the deflected light and transmit it to a polished optical window on the transmission medium. A grating transducer is secured on the transmission medium to detect acoustic signals reflected in the transmission medium. During position adjustment of the transmission medium and the waveguide, proper positioning is confirmed by a detected decrease in reflected acoustic signals, indicating the signals are entering the waveguide.

4791631, Dec 13, 1988

Aug 31, 1987

7/091239

Jean-Claude J. E. Baumert - San Jose CA
Gary C. Bjorklund - Los Altos CA
Wilfried Lenth - Capitola CA
William P. Risk - Mountain View CA
Franklin M. Schellenberg - Cupertino CA

International Business Machines Corporation - Armonk NY

H01S 310

372 22

A process and apparatus are disclosed for producing a beam of coherent radiation at essentially 459 nm by mixing, in a nonlinear crystal consisting essentially of KTP, two laser beams, one at essentially 1064 nm and the other at essentially 808 nm. The 1064 nm radiation is derived from a Nd:YAG laser that consists of an input mirror, an output mirror and a Nd:YAG crystal, and contains also the KTP crystal. The Nd:YAG laser is pumped by an essentially 808 nm semiconductor diode laser beam, which passes through the input mirror and through the KTP crystal into the Nd:YAG laser crystal where it is absorbed. The 1064 nm radiation oscillating inside the Nd:YAG laser resonator is mixed either with the said 808 nm pump beam or with 808 nm radiation provided by a second semiconductor diode laser whose light is coupled with the 1064 nm beam using a beamsplitter. The essentially 459 nm beam passes through the output mirror to a utilization device.

6218657, Apr 17, 2001

Oct 15, 1998

9/172759

Donald S. Bethune - San Jose CA
Ralph G. Devoe - Palo Alto CA
Christian Kurtsiefer - San Jose CA
Charles T. Rettner - San Jose CA
William P. Risk - Sunnyvale CA

International Business Machines Corporation - Armonk NY

H01J 4014

250214R

An avalanche-type detector circuit includes an avalanche-type photon detector device, a coupling capacitor, a bias network, a first transmission line and a second transmission line. The coupling capacitor has a first terminal that is coupled to a first terminal of the avalanche-type photon detector device. A first terminal of the bias network is coupled to the first terminal of the avalanche-type photon detector device, while a second terminal of the bias network is coupled to a bias voltage so that the avalanche-type photon detector device is reverse biased. A first end of the first transmission line is coupled to a second terminal of the coupling capacitor, and second end of the first transmission line is terminated by an open-circuit termination. A first end of the second transmission line is coupled to a second terminal of the avalanche-type photon detector device. The second end of the second transmission line is terminated by a short-circuit termination.

5048047, Sep 10, 1991

Sep 12, 1990

7/582286

William J. Kozlovsky - Mountain View CA
William P. Risk - Mountain View CA

International Business Machines Corporation - Armonk NY

H01S 308

372 92

Pump laser light is focused into a solid state laser material. A resonator is positioned around the laser material. The resonator is comprised of reflectors which have high reflectivity at both the pump light frequency and the solid state laser light frequency. The resonator is impedance matched to the pump laser. The pump light resonates inside the solid state laser material until practically all of it is absorbed.