Measurement of the Two-photon Absorption Coefficient of Gallium Phosphide (GaP) Using a Dispersion-minimized Sub-10 Femtosecond Z-scan Measurement System
Final rept. for period ending Aug 2012
ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
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This report describes the measurement of the two-photon absorption coefficient of gallium phosphide GaP at 9.4 fsec as measured with a unique Z-scan measurement system designed to support the shortest possible laser pulses. The Z-scan system is designed to minimize dispersion of the ultrashort laser pulse as it propagates so that the shortest possible pulse reaches the sample, as well support the entire 220-nm bandwidth of the pulse. Using the standard laboratory and analysis methods of Sheik-Bahae et al., we obtain a two-photon absorption coefficient, beta of GaP of 1.02 cmGW at 800 nm, a value commensurate with measurements at performed at longer pulse widths. To the best of our knowledge, this is the first determination of the two-photon absorption coefficient of GaP below 10 fsec.
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy