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	Design of a cryogenic absolute prism refractometer for infrared optical materials
	LIAO Sheng; NI LEi; REN Qifeng
	2011
会议名称	Proc. of SPIE
会议日期	2011
卷号	8321
页码	832117-1
通讯作者	LIAO Sheng
中文摘要	In order to enable high quality infrared lens designs at cryogenic temperature, we decided to study the IR materials' optical properties, such as the refractive index, the thermo-optic coefficient (dn/dT) etc. As a matter of fact, accurate precision refractive index data for infrared optical materials at cryogenic temperatures is scarce, so we decided to design a cryogenic absolute prism refractometer for infrared optical materials. Considering the most accurate and precise measurements of the real part of the refractive index, n, optical materials are obtained through minimum deviation refractometry, we decided to choose this classic refractometer for our cryogenic IR materials index measuring. Given the thermo-optic coefficient of many IR materials, which was reported by NASA, the measurement precision is at least 10-3. In order to achieve this precision, the error of apex angle of sample prism and deviation angle must be less than 20 arc-second. The thermal stress of the prism must be in control, or the volume change of the prism may lead to stress birefringence (photo-elastic effect). The bandwidth of IR source must be less than 20nm and the error caused by dispersion (dn/dλ) will generally be negligible in our system. The hardware system consists of 5 subsystems: the rotating sample chamber subsystem, the rotating plat mirror subsystem, the cryogenic vacuum subsystem, auto control subsystem, exit image collimation subsystem. Finally, the system is designed to measure IR materials' indices between 1-4, at the wavelength of 1.0-12μm, at room (300K) and cryogenic temperature (100K), with a precision of 10-4.
英文摘要	In order to enable high quality infrared lens designs at cryogenic temperature, we decided to study the IR materials' optical properties, such as the refractive index, the thermo-optic coefficient (dn/dT) etc. As a matter of fact, accurate precision refractive index data for infrared optical materials at cryogenic temperatures is scarce, so we decided to design a cryogenic absolute prism refractometer for infrared optical materials. Considering the most accurate and precise measurements of the real part of the refractive index, n, optical materials are obtained through minimum deviation refractometry, we decided to choose this classic refractometer for our cryogenic IR materials index measuring. Given the thermo-optic coefficient of many IR materials, which was reported by NASA, the measurement precision is at least 10-3. In order to achieve this precision, the error of apex angle of sample prism and deviation angle must be less than 20 arc-second. The thermal stress of the prism must be in control, or the volume change of the prism may lead to stress birefringence (photo-elastic effect). The bandwidth of IR source must be less than 20nm and the error caused by dispersion (dn/dλ) will generally be negligible in our system. The hardware system consists of 5 subsystems: the rotating sample chamber subsystem, the rotating plat mirror subsystem, the cryogenic vacuum subsystem, auto control subsystem, exit image collimation subsystem. Finally, the system is designed to measure IR materials' indices between 1-4, at the wavelength of 1.0-12μm, at room (300K) and cryogenic temperature (100K), with a precision of 10-4.
收录类别	EI
语种	英语
内容类型	会议论文
源URL	[http://ir.ioe.ac.cn/handle/181551/7451]
专题	光电技术研究所_应用光学研究室（二室）
作者单位	中国科学院光电技术研究所
推荐引用方式 GB/T 7714	LIAO Sheng,NI LEi,REN Qifeng. Design of a cryogenic absolute prism refractometer for infrared optical materials[C]. 见:Proc. of SPIE. 2011.

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