Larry Darnell Marshall

US Patent:

55219322, May 28, 1996

Filed:

May 3, 1994

Appl. No.:

8/237123

Inventors:

Larry R. Marshall - Reston VA

Assignee:

Light Solutions Corporation - Mountain View CA

International Classification:

H01S 304

US Classification:

372 36

Abstract:

A side-pumped solid laser employs diode array pumping to produce a near-diffraction-limited output beam in at least one dimension of the output beam, while maintaining high efficiency operation. Conversion efficiency is enhanced by orientation of a nonlinear crystal for enhanced beam quality along one axis, while improved beam quality is obtained in the other dimension by increasing absorption of the diode light within the laser crystal, reducing the crystal width, and/or a multi-pass reflector on the crystal face opposite the pumped face. The laser may be used in frequency doubling or wavelength shifting systems employing non-linear optical media. In that case, the output beam has its good axis preferentially aligned to enhance stability or prevent walkoff.

US Patent:

55110851, Apr 23, 1996

Filed:

Sep 2, 1994

Appl. No.:

8/300137

Inventors:

Larry R. Marshall - Reston VA

Assignee:

Light Solutions Corporation - Mountain View CA

International Classification:

H01S 310

US Classification:

372 22

Abstract:

A diode pumped laser is wavelength converted using an intracavity non-linear optical crystal, and the wavelength converted output is passively stabilized by a short cavity using unpolarized laser output. End pumping limits the number of transverse cavity modes, and intracavity etalon effects may be achieved by additional coatings deposited upon the laser or non-linear crystals themselves, further reducing the longitudinal mode spectrum. Wavelength converted output is enhanced by minimizing backward conversion in a linear cavity, or by folding the cavity via an angled face of the non-linear or the laser crystal.

US Patent:

51812118, Jan 19, 1993

Filed:

May 20, 1991

Appl. No.:

7/702531

Inventors:

Ralph L. Burnham - Reston VA
Jeffrey J. Kasinski - Fairfax VA
Larry R. Marshall - Reston VA

Assignee:

Fibertek, Inc. - Herndon VA

International Classification:

H01S 310

US Classification:

372 21

Abstract:

An eye-safe laser operating at high efficiency, pulse repetition rate and power output is described. The laser comprises a diode-array pumped laser having a pumping wavelength range which produces a polarized output beam. The output beam passes through a nonlinear tunable parametric converter crystal having X, Y, and Z principal axes. Noncritical phase matching is produced in said laser by phase matching for a beam propagation parallel to a principal axis which results in a high efficiency of laser operation. The nonlinear tunable parametric converter crystal converts the wavelength of an otherwise unsafe laser beam output to one that is harmlessly absorbed by the human eye.