准共振吸收染料介质的瞬态纯光学双稳性研究

以波长为5320?之脉冲激光激励置于F-P干涉仪腔内的BDN染料溶液,观察到明显的纯光学型瞬态光学双稳性效应。研究了引起该类准共振吸收介质折射率变化的各种可能物理机制的相对贡献大小;确定了在入射激光脉冲作用期间,染料介质折射率增量随时间的变化近似取半立方抛物线形式,并确认光-热效应对折射率变化的贡献在本实验条件下是最主要的。 关键词：

STUDY ON TRANSIENT OPTICAL BISTABILITY OF QUASI-RESONANT-ABSORPTIVE DYE MEDIUM

Using intense pulsed laser beam of 5320 ? to excite the BDN dye solution inside the F-P interferometer, we have found the transient and intrinsic optical bistability effect. The various possible mechanisms to induce the refractive-index change of the sample medium and their relative contributions have been estimated; finally it is confirmed that in the duration of input laser pulse the refractive-index variation increases with time approximately in the form of semi-cubic parabola, and the main mechanism to cause this variation is the opto-thermal effect of the sample medium.
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