Accession Number : AD0286062
Title : LASER PROGRESS AND APPLICATIONS
Corporate Author : ARMY RESEARCH OFFICE WASHINGTON D C
Personal Author(s) : MERRILL,HARRISON J.
Report Date : DEC 1962
Pagination or Media Count : 1
Abstract : The intensive laser development is based on a consideration of Schwalow and To nes who determined that optical stimulation could occur when the difference in energy states exceeded a certain minimum value. The output develops through emission as the popuation of a higher energy state is stimulated to return to the ground level. The condition of oscillation is controlled by reflectivity of cavity ends, the temperature and the effective volume. The modification of the Q by changes in reflectivity during laser stimulation permits operation in a single pulse having a peak power more than 3 megawatts with half power time less than 50 nano-sec. The pink ruby doped with .05% chromium has proved most useful operated as the three level laser. Improved efficiency and quality may be achieved by use of other materials. The laser source is unique optically characterized by its coherence, monochromaticity and high energy density. It may be useful in range finding, special illumination and communication and guidance control; as a source for special scientific investigations; it has already found uses in micro-welding and for restoring detached retinas in the eye.
Descriptors : *LASERS, CHROMIUM, COMMUNICATION SYSTEMS, GUIDANCE, ILLUMINATION, RANGE FINDING, RETINA, RUBY, SURGERY, THEORY, WELDING
Distribution Statement : APPROVED FOR PUBLIC RELEASE