Abstract

A calibration technique is described and employed for the photoacoustic measurement of three-photon absorption in TIBr and TIClBr at 1.06 μm. The generalized three-photon-absorption cross sections are found to be σ⁽³⁾ = (9 ± 7) × 10⁻⁸¹ cm⁶ sec² in TlClBr and σ⁽³⁾ = (7 ± 6) × 10⁻⁸² cm⁶ sec² in TlBr. The possibility of using the laser-power dependence of the photoacoustic signal to differentiate between the impact-ionization avalanche and multiphoton-polaron mechanisms of optical dielectric breakdown is also discussed. To date, we have seen no evidence of the behavior predicted by the avalanche model.

© 1985 Optical Society of America

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