The powerful output of FELIX, the recently built Rijnhuizen free‐electron laser, is used for the first frequency dependent study of nonlinear optical excitation of Hg1−xCdxTe in the far‐infrared spectral region. Two‐photon interband absorption has been investigated as a function of power and wavelength from 20 to 40 μm. This nonlinear optical absorption is used to perform autocorrelation experiments yielding the length of the micropulses of the free‐electron laser on a femtosecond time scale. The predicted dependence of the micropulse length on the synchronization between optical and electron pulses in the laser cavity is observed.
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© 1992 American Institute of Physics.
1992
American Institute of Physics
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