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Design of a cryogenic absolute prism refractometer for infrared optical materials
LIAO Sheng; NI LEi; REN Qifeng
Volume8321
Pages832117-1
2011
Language英语
Indexed ByEi
Subtype会议论文
AbstractIn 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.; 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.
Conference NameProc. of SPIE
Conference Date2011
Document Type会议论文
Identifierhttp://ir.ioe.ac.cn/handle/181551/7451
Collection应用光学研究室(二室)
Corresponding AuthorLIAO Sheng
Affiliation中国科学院光电技术研究所
Recommended Citation
GB/T 7714
LIAO Sheng,NI LEi,REN Qifeng. Design of a cryogenic absolute prism refractometer for infrared optical materials[C],2011:832117-1.
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