Accession Number : AD0907116

Title :   Frequency-Doubled, Single-Frequency Nd:YAG Laser.

Descriptive Note : Final technical rept.,

Corporate Author : UNITED AIRCRAFT RESEARCH LABS EAST HARTFORD CT

Personal Author(s) : Clobes, Arnold R.

Report Date : DEC 1972

Pagination or Media Count : 112

Abstract : The objective of the work reported herein is to achieve stable, single-frequency second harmonic power output from a Nd:YAG laser. Particular emphasis is placed on frequency and amplitude stability and on conversion efficiency. The experimental results of this program indicate that frequency and amplitude stable frequency-doubled operation of the single-frequency Nd:YAG laser can be achieved. Single-frequency operation is obtained by the use of a ring cavity containing a differential loss and frequency-doubled operation by the use of an intracavity 5 cu mm barium sodium niobate crystal. The 1.06 microns laser output is 3/4 to 1 W and the maximum 0.53 microns output is 140 mW. Degradation of the crystal reduced this level to a repeatable 50 to 100 mW frequency stable to + or - 12 MHz and amplitude stable to + or - 4 percent over a number of minutes operating period. Thermal effects in the nonlinear crystal arising from absorption of the fundamental wavelength radiation were found to limit the amplitude and frequency stability of the laser output. The same effects distort the 0.53 microns farfield beam profile and reduce the conversion efficiency. Techniques necessary to achieve stable frequency-doubled operation of the single-frequency Nd;YAG laser were established during this program. Further improvement in the stability and conversion efficiency depends on the availability of barium sodium niobate crystals with low absorption at 1.06 microns. (Author)

Descriptors :   (*LASERS, FREQUENCY CONVERTERS), INFRARED LASERS, NEODYMIUM, STABILITY, RINGS, BARIUM COMPOUNDS, SODIUM COMPOUNDS, NIOBATES, FOCUSING, THERMAL PROPERTIES, EFFICIENCY, SENSITIVITY, MIRRORS, HARMONIC GENERATORS, OPTICAL COMMUNICATIONS, SPACE COMMUNICATIONS, SPACEBORNE, CRYSTALS, LITHIUM COMPOUNDS, INTERFEROMETERS, STABILIZATION SYSTEMS, RODS, OSCILLATION, AMPLITUDE MODULATION.

Subject Categories : Lasers and Masers
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE