Summary form only given. Most recently, two-photon-absorption (2PA) conductivity in semiconductors has become an attractive alternative to second-harmonic generation for the measurement of ultrashort pulses. The method is based on the generation and detection of a photocurrent proportional to the square of the intensity in a semiconductor whose bandgap exceeds the photon energy of the pulses. We report three-photon-absorption (3PA) conductivity in a GaAsP photodiode and its use to achieve optical autocorrelation of short pulses. The /spl sim/150 fs pulses are generated by an optical parametric oscillator tunable from 1.4 to 1.6 /spl mu/m. A standard Michelson-type setup with a speaker allows for real-time autocorrelation. The delayed optical pulses are focussed to a spot size of /spl sim/4 /spl mu/m on the photodiode.


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    Title :

    Three photon-absorption autocorrelation in a GaAsP photodiode


    Contributors:
    Langlois, P. (author) / Ippen, E.P. (author)


    Publication date :

    1999-01-01


    Size :

    157363 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English