Abstract
We propose several methods for the accurate determination of the cross sections of solid-state saturable absorbers and apply them to the analysis of polycrystalline and . In the case of , both z-scan and power-dependent transmission measurements were made by using a continuous-wave fiber laser at and a pulsed optical parametric oscillator at . The average ground-state absorption cross sections at the wavelengths of 1800 and were determined to be and , respectively. Furthermore, the ratio of the cross sections at these wavelengths (2.75) was close to the value of 2.55 obtained from absorption spectrum measurements. Excited-state absorption was found to be negligible at both wavelengths. In the case of , a tunable, pulsed laser was used to obtain saturation data (z-scan and power-dependent saturation) at the wavelengths of 2645 and . Average ground-state absorption cross sections at 2645 and were determined to be and , respectively, again in very good agreement with those obtained from absorption spectrum measurements.
© 2008 Optical Society of America
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