Accession Number : ADA570407


Title :   Measurement of the Two-photon Absorption Coefficient of Gallium Phosphide (GaP) Using a Dispersion-minimized Sub-10 Femtosecond Z-scan Measurement System


Descriptive Note : Final rept. for period ending Aug 2012


Corporate Author : ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE


Personal Author(s) : Hoffman, Robert C ; Mott, Andrew G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a570407.pdf


Report Date : Sep 2012


Pagination or Media Count : 24


Abstract : 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 cm/GW 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.


Descriptors :   *ABSORPTION COEFFICIENTS , *GALLIUM PHOSPHIDES , *TWO PHOTON ABSORPTION , BEAM SPLITTING , BROADBAND , PULSED LASERS , REFRACTIVE INDEX , SEMICONDUCTORS , SUBSTRATES , THIN FILMS


Subject Categories : Inorganic Chemistry
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE