The birefringent effect of K9 glass has been studied under low pressure. The index of birefringence and its gradient have been measured.
研究K9玻璃在低压下的双折射效应，测量它的双折射率及其梯度。
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The test on its optical transmittance was conducted, and analysis of the refractive index profile of a gradientindex (GRIN) rod made of the base glass was performed.
Based on the combination of theory and practice, this paper discusses the formation of refractive indexgradient in optical glass and related questions of optical quality in the production processes.