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Proceedings Paper • Open Access

Stable and high power 515-nm lasers for the space gravitational wave detector: DECIGO
Author(s): Aru Suemasa; Ayumi Shimo-oku; Shunsuke Ohtsuka; Masaki Nakamori; Mitsuru Musha

Paper Abstract

We have developed the frequency-stabilized lasers for gravitational wave detector DECIGO, whose short-term and long-term frequency stability is required to be df/f=10-15 level with the high output power of 10 W. The short- and long-term frequency stability is realized by using frequency reference of an iodine absorption signal at 515 nm. We made two Breadboard models to evaluate the frequency stability of the laser. The short-term frequency stability is improved to 30 Hz/√Hz at 1 Hz by suppressing the intensity noise of the laser at modulation frequency of 200 kHz, and long-term frequency stability also improved by suppressing residual amplitude modulation (RAM). For increasing the output power with keeping its frequency stability, a 2-stage cascade fiber amplifier has been developed. In the current presentation, we report the status of our frequency stabilized lasers and the schematic of its higher power unit.

Paper Details

Date Published: 12 July 2019
PDF: 7 pages
Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111800V (12 July 2019); doi: 10.1117/12.2535950
Show Author Affiliations
Aru Suemasa, The Univ. of Electro-Communications (Japan)
Ayumi Shimo-oku, The Univ. of Electro-Communications (Japan)
Shunsuke Ohtsuka, The Univ. of Electro-Communications (Japan)
Masaki Nakamori, The Univ. of Electro-Communications (Japan)
Mitsuru Musha, The Univ. of Electro-Communications (Japan)


Published in SPIE Proceedings Vol. 11180:
International Conference on Space Optics — ICSO 2018
Zoran Sodnik; Nikos Karafolas; Bruno Cugny, Editor(s)

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