Measurement of air-refractive-index fluctuation from frequency change using phase modulation homodyne interferometer and external cavity laser diode

Masato Aketagawa; Yuta Hoshino; Masashi Ishige; Tuan Banh Quoc

doi:10.1117/12.814568

3 October 2008 Measurement of air-refractive-index fluctuation from frequency change using phase modulation homodyne interferometer and external cavity laser diode

Masato Aketagawa, Yuta Hoshino, Masashi Ishige, Tuan Banh Quoc

Author Affiliations +

Proceedings Volume 7155, Ninth International Symposium on Laser Metrology; 71551V (2008) https://doi.org/10.1117/12.814568
Event: Ninth International Symposium on Laser Metrology, 2008, Singapore, Singapore

Abstract

In the article, we propose a measurement method for a fluctuation of the air air-refractive refractive-index from the frequency measurement by combining a phase modulation homodyne interferometer (PMHI), an external cavity laser diode (ECLD) as the light source and a frequency stabilized laser (FSL) as the frequency reference. The PMHI, which is set in air environment, utilizes a Michelson interferometer and low low-thermal thermal-exp expansion ansion-glass (LTEG: the thermal expansion ratio: 2×10 10^-7 K^-1) for its main supporting structure. In the PMHI, a dark (or bright) interference fringe with a specific ) integer order N is converted to a null point by utilizing the phase modulation and the loc lock-in detection, and must be kept by use of the null null-method and the control on the ECLD frequency. Geometrical path change in the PMHI is neglected because of the ultra ultra-low low-thermal thermal-expansion condition. Therefore, at the null point for N-th order in the suff sufficient thermal icient condition, a fluctuation of the air air-refractive refractive-index can be measured by the ECLD frequency change, which is derived from a beat signal between the ECLD and the FSL. In the article, a measurement principle, instrumentation and experimental re results are discussed. sults

Citation Download Citation

Masato Aketagawa, Yuta Hoshino, Masashi Ishige, and Tuan Banh Quoc "Measurement of air-refractive-index fluctuation from frequency change using phase modulation homodyne interferometer and external cavity laser diode", Proc. SPIE 7155, Ninth International Symposium on Laser Metrology, 71551V (3 October 2008); https://doi.org/10.1117/12.814568

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