Randall J Lane

US Patent:

56571194, Aug 12, 1997

Filed:

Feb 1, 1995

Appl. No.:

8/382261

Inventors:

Shuichi Kawasaki - Tatebayashi, JP
Randall J. Lane - Brooktondale NY
Chung L. Tang - Ithaca NY

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

G01J 300
G01J 310

US Classification:

356300

Abstract:

A thermal lens spectrometer utilizes a continuously tunable optical parametric oscillator (OPO) to provide practical, easy-to-build, reliable spectrometer for measuring a wide variety of sample materials over a wide spectral range. A flow cell is placed in the path of the output beam from a tunable optical parametric oscillator, and material to be analyzed is placed in the cell. A laser probe beam is also directed into the cell coaxially with the OPO output beam. The OPO output beam acts as a pump, and the output probe beam from the cell is directed to an intensity sensor. The OPO is tuned over a selected frequency range, under computer control, for example, to produce an output probe beam having an intensity representing the spectral response of the material to be analyzed.

US Patent:

58355138, Nov 10, 1998

Filed:

Jan 8, 1997

Appl. No.:

8/780495

Inventors:

Jan-Willem Pieterse - San Jose CA
Alan B. Petersen - Palo Alto CA
Chris Pohalski - Mountain View CA
Emily Cheng - Sunnyvale CA
Randall Lane - Menlo Park CA
William L. Nighan - Menlo Park CA

Assignee:

Spectra Physics, Inc. - Mt. View CA

International Classification:

H01S 310

US Classification:

372 22

Abstract:

A diode pumped laser includes a high reflector and an output coupler defining a resonator. The resonator includes a gain medium and a Q-switch and produces a fundamental beam. A first non-linear crystal is positioned extra-cavity of the resonator along a path of the fundamental beam. The first non-linear crystal generates a second harmonic beam from the fundamental beam. The first non-linear crystal is critically phased matched. A second non-linear crystal is portioned extra-cavity of the resonator along a path of the fundamental beam and the path of the second harmonic beam. The second non-linear crystal produces a third harmonic beam. The second non-linear crystal is critically phased matched.