Accession Number : ADD015579

Title :   Method and Apparatus for Generating Fraunhofer Line Laser Source using Stimulated Raman Scattering.

Descriptive Note : Patent, Filed 16 May 91, patented 25 Aug 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Katz, Daniel L

Report Date : 25 Aug 1992

Pagination or Media Count : 5

Abstract : The present invention provides an apparatus and method for generating blue laser light having a wavelength corresponding to a solar Fraunhofer line. The blue laser light is at a frequency that has both excellent transmissibility through sea water and a high signal-to-ise ratio. A first laser beam, generated using an injection-locked excimer XeCl laser, is down-converted by a first-Stokes order shift of 2 x 4155 /cm 1/ in a first Raman cell containing H2 gas at a pressure of about 10 atmospheres. The output of the first Raman cell is down-converted by a first Stokes shift of 3628/cm in a second Raman cell containing HD/ at a pressure of about 10 atmospheres so that the output of the second Raman cell has a wavelength of 486.366 nm. This wavelength corresponds to the FE I solar Fraunhofer line.

Descriptors :   *LASERS, *SOLAR SPECTRUM, *PATENTS, *RAMAN SPECTRA, *SCATTERING, ATMOSPHERES, BLUE(COLOR), CELLS, EXCIMERS, FREQUENCY, INJECTION, LASER BEAMS, LIGHT, OCEANS, OUTPUT, PRESSURE, RATIOS, SEA WATER, SIGNALS, WATER, SIGNAL TO NOISE RATIO, XENON, CHLORIDES, HYDROGEN, GASES, FREQUENCY CONVERSION, RADIATION, ELECTROMAGNETIC SPECTRA, OPTICS

Subject Categories : Lasers and Masers
      Astrophysics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE