Patent ID: 8073017
Filing Date: 2011-12-06
Classification: H01S

Abstract:
1. An optical system for converting a pulsed beam of irradiation from a laser operating at a first wavelength to a pulsed beam of irradiation at a different second wavelength, the system comprising: a first Raman cell filled with a Raman-active gas; a second Raman cell filled with the Raman-active gas; and a beamsplitter arranged to split the pulsed laser beam at the first wavelength into a first portion and a second portion, to transmit the first portion into the first Raman cell without first passing through the second Raman cell, and to transmit the second portion into the second Raman cell without first passing through the first Raman cell; the second Raman cell arranged to receive a backward-propagating Stokes pulsed beam from the first Raman cell and to receive the second portion of the pulsed laser beam from the beamsplitter, said backward-propagating Stokes pulsed beam from the first Raman cell and said second portion of the pulsed laser beam entering the second cell in opposite directions, said second Raman cell adapted to generate an output pulsed beam at the second wavelength.