Charles Cheng Wang

US Patent:

6414980, Jul 2, 2002

Filed:

Oct 12, 1999

Appl. No.:

09/416354

Inventors:

Charles Xiaoyi Wang - Santa Clara CA
Acle V. Hicks - Cupertino CA

Assignee:

Coherent, Inc. - Santa Clara CA

International Classification:

H01J 305

US Classification:

372 92, 372 93

Abstract:

A method for operating an extracavity frequency-converted solid-state laser for performing a laser processing operation is disclosed. The laser has a laser-resonator including an optically-pumped gain-medium. The resonator is configured to compensate for a predetermined range of thermal lensing in the gain-medium. An optically-nonlinear crystal located outside the resonator converts fundamental laser radiation delivered by the resonator into frequency converted radiation. The laser processing operation is performed by a train of pulses of the frequency-converted radiation having sufficient power to perform the processing operation. The power of frequency-converted radiation is dependent on delivery parameters of the laser radiation from the laser-resonator. The laser is operated in a manner which provides that the resonator delivers effectively the same average power of fundamental laser radiation before and during the laser processing operation. This provides that thermal-lensing in the gain-medium is within the predetermined range before and during a laser processing operation.

US Patent:

6498653, Dec 24, 2002

Filed:

Jun 5, 2001

Appl. No.:

09/744203

Inventors:

Charles Wang - Compton CA

Assignee:

Optodyne, Inc.

International Classification:

G01B 1502

US Classification:

356498

Abstract:

The degree of accuracy a machine tool or the like is moved along a given path is determined by a unique preferably laser beam directing measuring system directing simultaneously or in sequence a laser beam parallel to the orthogonal axes of the two or three dimensional space in which the spindle or other object is to be moved in a path which can diverge appreciably in directions other than the directions of these axes. The beam directing means includes means which provides a measure of the actual positions the object has at various sampling times relative to the axis along which the beam is directed. This actual path position data is compared to the desired path position data used to program the object moving machine to determine the path position error at the sampling times involved.

US Patent:

6641261, Nov 4, 2003

Filed:

Oct 6, 2001

Appl. No.:

09/972479

Inventors:

Charles N. Wang - Campbell CA
Erhan H. Gunday - Santa Barbara CA
Albert M. Jurgens - New Fairfield CT
Eric C. Miller - Los Gatos CA

Assignee:

Stryker Corporation - Kalamazoo MI

International Classification:

G02C 710

US Classification:

351 44, 351163

Abstract:

A lens transmits a maximum 2 percent average intensity of ultraviolet light and transmits a minimum 95 percent average intensity of light in a brightness perception spectrum of the eye. In addition, maximum percentages of violet and/or blue light are transmitted. In some cases, the lens transmits a maximum percentage average intensity of red light while transmitting the minimum 95 percent average intensity of light in the brightness perception spectrum. The lens is incorporated in protective eyewear, especially into eyewear used by medical personnel.

US Patent:

6680648, Jan 20, 2004

Filed:

Mar 8, 2002

Appl. No.:

10/093681

Inventors:

Tien M. Nguyen - Placentia CA
James Yoh - Palos Verdes Peninsula CA
Charles C. Wang - Alhambra CA
Diana M. Johnson - Redondo Beach CA

Assignee:

The Aerospace Corporation - El Segundo CA

International Classification:

H03F 126

US Classification:

330149, 375297, 455 63

Abstract:

An adaptive predistorter system receives and predistorts an input signal so as to linearize the output signal of a nonlinear high power amplifier amplifying the predistorted input signal using closed-loop feedback of the output signal in complex form at baseband so as to adaptively change the amount of the predistortion of the input signal in the presence of high power amplifier changing characteristics.

US Patent:

6683893, Jan 27, 2004

Filed:

Oct 25, 2001

Appl. No.:

10/001681

Inventors:

Charles X. Wang - Santa Clara CA

Assignee:

Coherent, Inc. - Santa Clara CA

International Classification:

H01S 311

US Classification:

372 10, 372 25

Abstract:

A method of operating a continuously pumped, Q-switched laser to provide trains of pulses for laser operations is disclosed. The laser includes a solid-state gain-medium that exhibits a thermal-lensing effect on being optically pumped. Pulse delivery is controlled by a Q-switch that is in a normally-open state when the laser is not delivering pulses. This allows the laser to deliver CW laser radiation when pulses are not being delivered. A train of pulses is delivered by repeatedly interrupting the CW operation by closing then reopening the Q-switch. When the Q-switch reopens after the interruption, the laser delivers a pulse of laser radiation, then resumes delivery of CW operation until the next interruption. The inventive Q-switching method provides, by means of this one particular repeated Q-switch operation, that the thermal-lensing effect in the gain-medium before, during, and between delivery of pulse trains remains constant, and that all pulses in a pulse train have the same peak power.

US Patent:

6686856, Feb 3, 2004

Filed:

Nov 20, 2002

Appl. No.:

10/300255

Inventors:

Charles Wang - San Jose CA
Miaobin Gao - San Jose CA
Gladney Asada - San Jose CA

Assignee:

Agilent Technologies, Inc. - Palo Alto CA

International Classification:

H03M 900

US Classification:

341100, 341101

Abstract:

Systems and methods of converting data streams from one clocking domain to another are described. In one aspect, a clocking domain conversion system includes an input, an output, a routing circuit, and a clock generator. The input is operable to simultaneously load N input bits during each load cycle at an average rate R , wherein N has an integer value of at least 1. The output is operable to simultaneously output M output bits during each output cycle at an average rate R , wherein M has an integer value of at least 1 and MâN. The routing circuit is operable to route the N input bits from the input to the output at a clocking rate R and with a dividing ratio K of the routing circuit data rate relative to the higher of the input and output data rates, given by if The clock generator is operable to generate a clock signal for controlling the routing circuit and characterized by a non-uniform sequence of pulses having an average period T between successive pulses, given by.

US Patent:

6729726, May 4, 2004

Filed:

Oct 6, 2001

Appl. No.:

09/972478

Inventors:

Eric C. Miller - Los Gatos CA
Charles N. Wang - Campbell CA
Erhan H. Gunday - Santa Barbara CA
Albert M. Juergens - New Fairfield CT

Assignee:

Stryker Corporation - Kalamazoo MI

International Classification:

G02C 100

US Classification:

351158, 351123, 381381

Abstract:

Eyewear for two-way communication comprises a speaker and a microphone. The speaker is supported by an earstem of the eyewear. In some embodiments the earstem is formed into a speaker support loop. The speaker is supported by the loop and held away from the wearers external outer ear. Speaker position is adjustable in relation to the wearers ear. An electrical cord couples the microphone and speakers to a wearer unit that includes a wireless transceiver. The electrical cord functions as a neck strap to support the eyewear when removed from the head.

US Patent:

6754194, Jun 22, 2004

Filed:

Sep 13, 2002

Appl. No.:

10/243228

Inventors:

Kumar Ramaswamy - Plainsboro NJ
Paul Gothard Knutson - Lawrenceville NJ
Wen Gao - Plainsboro NJ
Charles Chuanming Wang - Jamison PA

Assignee:

Thomson Licensing S.A. - Boulogne-Billancourt

International Classification:

H04Q 700

US Classification:

370331, 370338

Abstract:

A method and apparatus for detecting the presence of a wireless local area network (WLAN) ( ) detects at least one signature sequence in a radio frequency (RF) signal associated with a WLAN ( ). The present invention indicates the presence of a WLAN ( ) in response to the detection of the at least one signature sequence in the RF signal.