玻璃基板中热光效应折射率分布的研究和测定

几乎所有的光学材料都具有热致折射率变化的特性,当光束经过局域热源作用下折射率呈梯度分布的介质时会发生偏向,利用这种特性可做成各种热光器件.本文在玻璃基板表面上制备了条形Ti薄膜热源,通过测定出射光束的偏向角,利用解折方法,得出基极截面的折射率分布.根据能量守恒,得到该材料的折射率温度系数,与公布值比较,验证了本方法的正确性.本文对研究和分析热光材料和器件提供了一种有益的方法.

Studying and measuring distribution of refractive index for thermo-optic effect in glass substrate

Almost all optical materials have the properties of thermal refractive index varying. Under the action of the local thermal source, distribution of refractive index is gradient, and the direction of propergation of the passing light beam will deflect. According to this physical property, it is possible to make various thermo-optic devices. It is proposed to fabricate strip Ti-film thermal source and to measure the deflecting angles of emergence beam in the paper. Using analytic method, the distribution of refractive index on the profile of substrate is obtained. And then according to energy conservation, tempreture coefficient of refractive index of the material is obtained. Compared with the annouced values, it is verified that our experiment method is correct. The method described is available for studying and analying thermo-optic materials and devices.