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Measurement of frequency noise spectra of frequency-stabilized LD-pumped Nd:YAG laser by using a cavity with separately suspended mirrors |
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| Authors: | Mitsuru Musha Souichi Telada Kenichi Nakagawa Masatake Ohashi Ken-ichi Ueda |
| Affiliation: | a Spacetime Astronomy Section, National Astronomical Observatory, 2-21-1 Ohsawa, Mitaka-shi, Tokyo 181, Japan b Department of Astronomical Science, Grad. Univ. Advanced Studies, Tokyo, Japan c Tokyo Institute of Polytechnics, Tokyo, Japan d Institute for Laser Science, University of Electro-Communications, Tokyo, Japan |
| Abstract: | We have developed a frequency stability system for a commercial LD-pumped Nd:YAG laser in a nonplanar ring oscillator geometry (MISER) which is used for our 20-m prototype gravitational wave detector. The frequency of the laser is locked to the rigid cavity resonance frequency, and the relative frequency noise is suppressed down to 3 × 10−4 Hz/Hz1/2 the shot-noise limited level at below 1 kHz. We are successful in evaluating the frequency noise level more accurately by means of a separately suspended reirror type cavity (4-m mode-cleaner); the noise level is 2 × 10−2 Hz/Hz1/2. As compared to a frequency noise spectrum which is locked to separately suspended mirror type cavities, the frequency noise is lower at a frequency below 400 Hz. |
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