Abstract
High efficiency pulse compression has been obtained by using a homogeneously pumped intracavity Raman oscillator or amplifier. Using a 25 ns duration ruby laser as the pump source and compressed hydrogen as the Raman scatterer, this technique, like a previous externally pumped intracavity Raman oscillator, has produced 2 ns duration second Stokes pulses with near 50% quantum efficiency. With the present technique the spatial quality of the second Stokes beam has been very good because of an off-axis pumping of the cavity. Working as an amplifier, the system has reproduced perfectly both temporal shape and divergence of a nearly diffraction limited input second Stokes beam.
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