Nonlinear refraction and absorption measurements with chirped femtosecond laser pulses: Experiments and simulations
Journal
Journal of the Optical Society of America B: Optical Physics
Journal Volume
16
Journal Issue
4
Pages
651-661
Date Issued
1999
Author(s)
Abstract
We report an extension of the spectrally resolved two-beam coupling technique to measure the nonlinear intensity index of refraction (n2I) and the two-photon absorption coefficient (β) by use of chirped laser pulses. The linear chirp parameter b is incorporated into the derivation of a more general model than the previous one [Opt. Lett.22, 1077 (1997)]. We have also analyzed the validity of this linear chirp model through a comparison of the experimental results for fused silica with the numerically accurate calculation that considers higher-order chirps obtained by second-harmonic generation frequency-resolved optical gating. The results show that this method potentially can be used to extract the chirp. Finally, we applied this transient spectrally resolved nonlinear transmittance spectroscopy to semiconductor-doped glasses to extract their n2I and β.
SDGs
Publisher
Optical Society of America Inc., Washington
Type
journal article