Two-photon absorption coefficients in uv window and coating materials. 1979

P Liu, and R Yen, and N Bloembergen

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 2homega, the nonlinear absorption is below the detection limit of 3 x 10(-6) cm/MW. CdF(2) has a two-photon absorption coefficient 1.6 x 10(-3) cm/MW at 266 nm, which is comparable with that of the alkali-halides. The newly developed window material LiYF(4) has no detectable nonlinear loss at 266 nm.

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