Frequency reproducibility of I2-stabilized Nd:YAG lasers

Feng-Lei Hong; Yun Zhang; Jun Ishikawa; Youichi Bitou; Atsushi Onae; Jun Yoda; Hirokazu Matsumoto; Kenichi Nakagawa

doi:10.1117/12.424464

3 May 2001 Frequency reproducibility of I₂-stabilized Nd:YAG lasers

Feng-Lei Hong, Yun Zhang, Jun Ishikawa, Youichi Bitou, Atsushi Onae, Jun Yoda, Hirokazu Matsumoto, Kenichi Nakagawa

Proceedings Volume 4269, Laser Frequency Stabilization, Standards, Measurement, and Applications; (2001) https://doi.org/10.1117/12.424464
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

Abstract

We have established four I₂-stabilized Nd:YAG lasers to verify the frequency reproducibility of the lasers. The observed square root Allan variance of the four lasers was between 1 to approximately 4 X 10^-14 depending on the obtained signal-to-noise ratio of the spectra, when the integration time is larger than 300 s. The observed frequency reproducibility of each laser was ranged from 9.1 X 10^-14 approximately 1.5 X 10^-13 (corresponding to frequency uncertainties of +/- 51 approximately 87 Hz). Frequency reproducibility of a group of lasers (four NRLM lasers) has been evaluated to be 8.2 X 10^-13 (corresponding to a frequency uncertainty of +/- 640 Hz). One of the four NRLM lasers is a compact I₂- stabilized Nd:YAG laser which is suitable to be transported to other laboratories for international frequency comparisons. Using this portable laser, we have accomplished frequency comparisons of Nd:YAG lasers between several metrological institutes in different countries. The absolute optical frequencies of the NRLM lasers were determined with an uncertainty of about 1.5 kHz by the frequency comparison between the NRLM and the JILA (formerly the Joint Institute for Laboratory of Astrophysics), Boulder, CO.

Citation Download Citation

Feng-Lei Hong, Yun Zhang, Jun Ishikawa, Youichi Bitou, Atsushi Onae, Jun Yoda, Hirokazu Matsumoto, and Kenichi Nakagawa "Frequency reproducibility of I₂-stabilized Nd:YAG lasers", Proc. SPIE 4269, Laser Frequency Stabilization, Standards, Measurement, and Applications, (3 May 2001); https://doi.org/10.1117/12.424464

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