Title: Improvement of free-spectral-range measurement for Fabry-Perot cavity using phase modulation technique

Authors: Masato Aketagawa; Hiroshi Iwata; Tuan Quoc Banh; Kenji Hirata

Addresses: Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata, 940-2188, Japan. ' Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata, 940-2188, Japan. ' Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata, 940-2188, Japan. ' Department of Mechanical Engineering, Nagaoka University of Technology, Kamitomioka, Nagaoka, Niigata, 940-2188, Japan

Abstract: The free-spectral-range (FSR) of the Fabry-Perot cavity can be determined with the null method using an electric-optical modulator, a frequency modulation and the lock-in detection. In this paper, we discuss the reduction of the measurement uncertainty for the FSR. The relative measurement uncertainty (ΔFSR / FSR) of 108 order has been estimated.

Keywords: Fabry-Perot cavity; FP cavity; free spectral range; FSR; null method; frequency modulation; lock-in detection.

DOI: 10.1504/IJNM.2012.044652

International Journal of Nanomanufacturing, 2012 Vol.8 No.1/2, pp.23 - 30

Available online: 01 Jan 2012 *

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