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利用自准直法 ,在 2 0℃到 170℃温度范围和 0 .4 880 μm、0 .6 32 8μm、1.0 6 4 0 μm、1.0 795 μm、1.3414 μm等波长测量了Nd0 .0 0 7Gd0 .993 VO4晶体的折射率 ,得到了这种晶体的Sellmeier方程和折射率温度系数。为了验证得到结果的可靠性 ,利用得到的Sellmeier方程计算 1.0 6 4 0 μm的寻常光和异常光的折射率 ,并与实验测量的结果进行比较 ,两者的差异不大于 2 .2× 10 -4,处在测量误差的范围内。测量结果表明在室温下 ,对 1.0 6 4 0 μm波长的双折射率为 0 .2 2 0 1,双折射率温度变化率为 4 .3× 10 -6/℃。因此 ,与YVO4相仿 ,这种晶体不仅是一种优秀的激光基质材料 ,而且是一种优秀的双折射晶体。
The self-collimation method was used to measure the Nd0. 0 0 7Gd0 in the temperature range of 20 ℃ to 170 ℃ and the wavelengths of 0.488μm, 0.6328μm, 1.0640μm, 1.0795μm and 1.3414μm. 993 VO4 crystal refractive index, get the Sellmeier equation of such crystals and refractive index temperature coefficient. In order to verify the reliability of the obtained results, the refractive index of ordinary and extraordinary light 1.0 6 4 0 μm was calculated by Sellmeier equation and compared with the experimental results, the difference between the two is not more than 2.2 × 10 - 4, in the range of measurement error. The measurement results show that at room temperature, the birefringence for 1.06 4 0 μm wavelength is 0.2201 and the birefringence rate is 4. 3 × 10 -6 / ° C. Therefore, similar to the YVO4, this crystal is not only an excellent laser matrix material but also an excellent birefringent crystal.