High-sensitivity, single-beam n_2 measurements
Mansoor Sheik‐BahaeCenter for Research in Electro-Optics and Lasers, University of Central Florida, Orlando, Florida 32816A. A. SaidCenter for Research in Electro-Optics and Lasers, University of Central Florida, Orlando, Florida 32816Eric W. Van StrylandCenter for Research in Electro-Optics and Lasers, University of Central Florida, Orlando, Florida 32816
1989en
ABI
Аннотация
We present a simple yet highly sensitive single-beam experimental technique for the determination of both the sign and magnitude of n(2). The sample is moved along the z direction of a focused Gaussian beam while the repetitively pulsed laser energy is held fixed. The resultant plot of transmittance through an aperture in the far field yields a dispersion-shaped curve from which n(2) is easily calculated. A transmittance change of 1% corresponds to a phase distortion of approximately lambda/250. We demonstrate this method on several materials using both CO(2) and Nd:YAG laser pulses.
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