Accession Number : ADD008033

Title :   Electrically Excited Mercury Halide Laser.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Burnham,Ralph L

Report Date : 28 Oct 1980

Pagination or Media Count : 5

Abstract : An improved electric-discharge-excited mercury halide dissociation laser operable on the (B-X) transitions in HgCl, HgBr and HgI at 558, 502 and 443 nm respectively. The laser discharge cell is elongated and made from temperature-resistant silicon-glass laminate or any other suitable material and includes separate ceramic crucibles for containing mercuric dihalide crystals. A pair of electrodes, each having external terminals, extend along the linear axis of the cell in parallel relationship with the linear axis and each other. Ultraviolet discharge means is also provided for preionizing a buffer gas of helium to which nitrogen has been added. The improvement comprises the addition of nitrogen to the buffer gas of helium which is admitted to the laser cell prior to excitation. The addition of nitrogen may act to selectively remove the terminal levels of the mercury halide laser transitions, thereby permitting more efficient extraction of the optical energy from the laser media. Thus improvements in both efficiency and output energy are obtained. The laser cavity is completed by a fully and a partially reflective surface for the wavelength of operation. The gasses are preionized and excited by pulsed electrical energy from separate sources. (author)

Descriptors :   *Patents, *Electrical lasers, *Mercury compounds, *Halides, Chlorides, Bromides, Iodides, Excitation, Electric discharges, Helium, Nitrogen, Gas ionization, Laser cavities, Reflectivity

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE