Neodymium-glass disk laser amplifier with an immersion medium
A description is given of a laser amplifier with a disk active element made of GLS2 (40 x 40 x 220 mm dimensions). This amplifier is filled with thionyl chloride (n=1.53, absorption coefficient k<10/sup -3/ cm/sup -1/ at lambda=1.06 ..mu..). The single-pass inactive losses, per 1 cm length of the active medium, are 4.3 x 10/sup -3/ cm/sup -1/. The results are reported of measurements of the small-signal gain and of the gain obtained at pump energy densities up to 25 J/cm/sup 3/.