Accession Number : AD0908069

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

Descriptive Note : Final rept. 3 Apr-3 Nov 72,

Corporate Author : LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB

Personal Author(s) : Culshaw, William ; Kannelaud, Jaan ; Peterson, James E.

Report Date : JAN 1973

Pagination or Media Count : 106

Abstract : The report deals with the theoretical and experimental work done on the basic techniques and successful operation of a stable, frequency-doubled, single-frequency Nd:YAG laser. An efficient, resonant cavity design with the Nd: YAG rod acting as an internal focusing element was used to attain adequate TEM sub 00 mode volumes in the laser rod and the small beam waists at the nonlinear crystal (Ba2NaNb5O15) necessary for optimum intracavity second-harmonic generation. Various mode filters were investigated, resulting in the use of a double, intracavity Fabry-Perot etalon arrangement to obtain single-frequency operation of the Nd:YAGlaser with relative ease. Mode competition effects were studied, and the necessary conditions for stable single-frequency operation at both 1.06 and 0.53 micrometers were established. Techniques and component designs were successfully developed to obtain all the frequency-doubled output in a single direction. These included appropriate cavity geometries and the design of doubly reflecting laser mirrors for both 1.06 and 0.53 micrometers including phase considerations, and also the development of AR coatings on Ba2NaNb5O15 effective at both wavelengths. The adequacy of the techniques adopted was demonstrated, and a unidirectional, single-frequency, frequency-doubled power output of 0.35 W obtained consistently from a 5 by 50 mm Nd:YAG rod pumped by a tungsten-iodine lamp operated at approx 850 W in a spherical pump cavity.

Descriptors :   (*LASERS, SPACE COMMUNICATIONS), OPTICAL COMMUNICATIONS, NEODYMIUM, RODS, CRYSTALS, MIRRORS, QUARTZ, POWER, CAVITY RESONATORS, RINGS, REFRACTIVE INDEX, OPTICAL PUMPING, GAIN, TUNGSTEN.

Subject Categories : Lasers and Masers
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE