研究了光学玻璃的热光常数与温度和波长的关系.结果表明:热光常数W值随温度上升而线性增加,可用方程式W_(λt)=W_(λ0)+θt表示;随着波长(从短波到长波)增大,热光常数W值下降,可用多项式W_λ~2=A_0+A_1λ~2+A_2λ~(-2)+A~3λ(-4)+…表示.利用上述公式可以计算光学玻璃室温至转变温度范围内任意温度及可见光谱区内任意波长处的热光常数W值.

The dependence of thermo-optic coefficients W of glasses on temperature and wavelength has been investigated. The results show that W increases linearly with temperature according to the equation Wλt = Wλo+θt, while it decreases which increasing wavelength according to the equation W2 = A0 + A1λ2 + A2λ2+A3λ-4+ …. It has been found that thermo-optic coefficients W of glasses at any temperature in the range from room temperature to annealing temperature and at any wavelength in the visible region can be calculated by these equations.