液晶對1.06微米雷射光之加熱效應和自我相位調制現象

Abstract

我們以1.06微米的Nd:YAG雷射為光源,研究液晶非線性的折射率變化.因為 液晶的空間自我調變現象,使得入射的雷射光會在遠處屏幕上形成繞射環, 以及液晶因吸收光而產生的熱效應,會使得液晶分子變得容易轉動.我們發 現有Freedericksz transition 且其threshold intensity 和理論吻合. 觀測到的環數比理論預測的要低很多. We disscuss that the laser heating effect can add the maximun rotion angle of liquid crystal within 1.06 micron metter Nd:YAG laser. By the measurement of the diffraction patterns induced by the spatial sefl-phase modulation effect it can help us to realize the temperature icrement of the sample. We found that there was Freederiscksz transition and the threshold insity consistent with our calculation. The number of rings that we measured was fewer then we calculated.