Abstract
Atomic vapor laser isotope separation requires the copropagation of multiple beams at different wavelengths and at average powers >1 kW.1 Although we use mirror coatings that absorb less than one part in 105, the beams still suffer from thermally induced phase distortions, both in the dye amplifiers and in transmissive optics, such as beam combiners and vacuum windows. These aberrations are second-order and third-order and can reach 5 waves peak-to-valley (p–v), which causes the beam to distort and break up when propagated over large distances.
© 1992 Optical Society of America
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