Ogusu Kazuhiko, Suzuki Keijiro, Nishio Hajime
Department of Electrical and Electronic Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan.
Opt Lett. 2006 Apr 1;31(7):909-11. doi: 10.1364/ol.31.000909.
We propose a simple and accurate method for measuring the refractive index and the absorption coefficient of an absorbing parallel plate. The method is essentially based on transmittance measurement with minimum reflectance at the Brewster angle for p-polarized light, which enables us to measure a low absorption loss of the order of 0.1 dB/cm for a typical plate thickness of 1 mm. The error that is due to the approximation used is practically negligible, and the accuracy of measured results depends mainly on the variations in the flatness and parallelism of the two surfaces of the sample and on instrumental errors.
我们提出了一种简单而准确的方法来测量吸收性平行平板的折射率和吸收系数。该方法主要基于在布儒斯特角下对p偏振光进行的具有最小反射率的透过率测量，这使我们能够测量典型厚度为1毫米的平板中低至0.1 dB/cm量级的吸收损耗。由于所采用的近似而产生的误差实际上可以忽略不计，测量结果的准确性主要取决于样品两个表面的平整度和平行度的变化以及仪器误差。
