Phase conjugation under two-photon absorption conditions in polydiacetylene crystals

被引：5
作者：
Nunzi, JM [1 ]
Charra, F [1 ]
机构：
[1] CEA Technol Avancees, LETI, DEIN SPE, Grp Composants Organ,Ctr Etud Saclay, F-91191 Gif Sur Yvette, France
来源：
PURE AND APPLIED OPTICS | 1998年 / 7卷 / 03期
关键词：
D O I：
10.1088/0963-9659/7/3/012
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Phase-conjugation experiments have been performed in a backward degenerate four-wave mixing geometry using 1064 nm picosecond light pulses in thick p-toluene sulphonate polydiacetylene crystals. Two-photon absorption is identified and characterized. The relevant propagation equations are resolved analytically in different experimental geometries. Nonlinear absorption cancels out all the phase-conjugate signal at similar to GW cm(-2) light fluences. A time-dependent analysis of the effect in a pump and nonlinear-probe experiment reveals an excited-state-induced nonlinearity.
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页码：501 / 516
页数：16
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