Method and apparatus for generating Fraunhofer line laser source

Details Method and apparatus for generating Fraunhofer line laser source Method and apparatus for generating Fraunhofer line laser source

1991-05-16

1992-08-25

Epps, Georgia Y.

Optical: systems and elements

Optical frequency converter

Raman type

372 3, H03F 700

Patent

active

051426455

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-noise ratio. A first laser beam, generated using an injection-locked excimer XeCl laser, is down-converted by a first-Stokes order shift of 2.times.4155 cm.sup.-1 in a first Raman cell containing H.sub.2 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.sup.-1 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.

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