A method for generating ultra-short pulse amplified Raman laser light.
Short pulse laser light is amplified, and a portion thereof is introduced
into a Raman oscillator to produce compressed laser light. The compressed
light is introduced to a first Raman amplifier. The remainder of the
short pulse laser light is introduced to a polarizer, and the reflected
light is introduced into the first Raman amplifier to pump it. The light
transmitted through the first Raman amplifier that has not contributed to
pumping is introduced to a beam splitter to produce a second reflected
light that is passed to a second Raman amplifier to pump that amplifier.
The compressed light is amplified in the first Raman amplifier and
introduced to the second Raman amplifier to further amplify it. This
further amplified radiation is passed through delay lines to the beam
splitter, which passes only first Stokes radiation to generate
ultra-short pulse amplified Raman laser light.