Accession Number : ADD016219

Title :   Two-Micron Modelocked Laser System.

Descriptive Note : Patent, Filed 30 Oct 92, patented 21 Dec 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Esterowitz, Leon ; Pinto, Joseph F

Report Date : 21 Dec 1993

Pagination or Media Count : 7

Abstract : A continuous wave modelocked laser is provided which generates output pulses having a duration in the picosecond range at a repetition rate in the MHz to GHz ranges. The laser includes a laser cavity defined by spaced, opposed reflective member forming a reflective path therebetween; a host laser crystal disposed in the cavity; an acousto-optic modulator disposed between the host laser crystal and one reflective member for modulating the output of the host laser crystal; and a birefringent filter, disposed in the laser cavity between the host laser crystal and the one reflective member, for tuning the laser emission to any one of a plurality of wavelengths within a range between 1.86 micrometers and 2.14 micrometers. A pump source pumps the host laser crystal at a wavelength of substantially 785 nm. A collimating plano-convex lens is disposed so that the planar face thereof faces the laser crystal. A mechanical device adjusts the length of the reflective path by axially displacing the one reflective member in the laser cavity so as to match the cavity round trip time to the second harmonic of the drive frequency of the acoustic-optic modulator.

Descriptors :   *PATENTS, *MODE LOCKED LASERS, ACOUSTICS, CAVITIES, CONTINUOUS WAVES, CRYSTALS, EMISSION, FILTERS, FREQUENCY, HARMONICS, LASER CAVITIES, ACOUSTOOPTICS, LASER MODULATORS, LASERS, MODULATORS, OPTICS, BIREFRINGENCE, LASER PUMPING, PATHS, PULSES, REPETITION RATE, TUNING

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE