| Summary: | 碩士 === 國立臺灣大學 === 光電工程學研究所 === 86 === In this dissertation, we report a time-resolved phase-sensitivity techniqu
e to measure nonlinear refractive index (n2) and two-photon absorption coeffic
ient using chirped femtosecond laser pulses. This technique is based on the in
duced phase variation and the energy loss in the probe beam caused by the pump
beam. The linear chirp b is incorporated into the derivation of a more genera
lized model than the previous one [I. Kang, et al., Opt. Lett. 22, 1077 (1997)
]. This transient nonlinear transmittance spectroscopy has been applied to fus
ed silica and semiconductor-doped glasses to extract their n2 and b. The deduc
ed chirp parameter b is closely matched with the frequency-resolved optical ga
ting (FROG) result. We have also analyzed the validity of this linear chirp mo
del through the comparison with the numerically accurate calculation that cons
iders the higher-order chirps.
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