Photothermal-lensing measurements of two-photon absorption and two-photon-induced color centers in borosilicate glasses at 532 nm

Abstract

Using photothermal lensing, we have measured two-photon absorption coefficients and have observed laser-induced solarization at 532 nm in the transparent borosilicate glasses BK-3, BK-7, and BK-10. The two-photon absorption coefficients at 532 nm are 0.6, 2.9, and 0.4 cm/TW for BK-3, BK-7, and BK-10, respectively. This is approximately 2 orders of magnitude smaller than the two-photon absorption coefficients of crystalline materials of comparable energy-band gap. Our results in BK-7 indicate that a two-photon processinitiates the solarization and that one-photon bleaching limits it. The maximum induced absorption at 532 nm in BK-7 is approximately 0.07 cm⁻¹ per GW/cm².

© 1985 Optical Society of America

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