Abstract
The two-photon absorption coefficients of some uv transmitting window and coating materials are measured at 355 nm and 266 nm. In materials with band gaps larger than 2ħω, the nonlinear absorption is below the detection limit of 3 × 10−6 cm/MW. CdF2 has a two-photon absorption coefficient 1.6 × 10−3 cm/MW at 266 nm, which is comparable with that of the alkali-halides. The newly developed window material LiYF4 has no detectable nonlinear loss at 266 nm.
© 1979 Optical Society of America
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