The development of optical chamber which can maintain temperature and absolute air refractive index using geometrical path compensation

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630022
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Production engineering/Processing studies
• Research Institution: Nagaoka University of Technology
• Principal Investigator: MASATO Aketagawa 長岡技術科学大学, 工学(系)研究科(研究院), 教授 (10231854)
• Co-Investigator(Kenkyū-buntansha): 韋 冬 長岡技術科学大学, 工学(系)研究科(研究院), 助教 (70610418)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: 空気屈折率 / 幾何学長 / 光路長 / 能動制御 / 干渉計

Outline of Final Research Achievements

The absolute air-refractive index can be determined by comparing optical path difference for the cases that the optical chamber is at vacuum or at normal pressure. But, for the comparison, the geometrical length change of the chamber must be kept within 0.1 nm for 1m geometrical length, if it is required that 10-10 order precision. In this research, we have proposed an active compensation of the geometrical length change of the chamber using the optical interferometer. We have also proposed the use of frequency measurement for the detection of the optical path change. We succeeded 10nm order compensation with the proposed method.

Free Research Field

精密工学