Second-generation gravitational wave detectors require a highly stable laser with an output power greater than 100 W to attain their target sensitivity. We have developed a frequency stabilization system for a 100-W injection-locked Nd:YAG (yttrium aluminum garnet) laser. By placing an external wideband electro-optic modulator used as a fast-frequency actuator in the optical path of the slave output, we can circumvent a phase delay in the frequency control loop originating from the pole of an injection-locked slave cavity. Thus, we have developed an electro-optic modulator made of a MgO-doped stoichiometric crystal. Using this modulator, we achieve a frequency control bandwidth of 800 kHz and a control gain of 180 dB at 1 kHz. These values satisfy the requirement for a laser frequency control loop in second-generation gravitational wave detectors.
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July 2010
Research Article|
July 14 2010
Wideband and high-gain frequency stabilization of a 100-W injection-locked Nd:YAG laser for second-generation gravitational wave detectors
Noriaki Ohmae;
Noriaki Ohmae
a)
Department of Advanced Materials Science,
University of Tokyo
, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
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Shigenori Moriwaki;
Shigenori Moriwaki
Department of Advanced Materials Science,
University of Tokyo
, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
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Norikatsu Mio
Norikatsu Mio
Department of Advanced Materials Science,
University of Tokyo
, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan
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a)
Electronic mail: [email protected].
Rev. Sci. Instrum. 81, 073105 (2010)
Article history
Received:
May 01 2010
Accepted:
June 07 2010
Citation
Noriaki Ohmae, Shigenori Moriwaki, Norikatsu Mio; Wideband and high-gain frequency stabilization of a 100-W injection-locked Nd:YAG laser for second-generation gravitational wave detectors. Rev. Sci. Instrum. 1 July 2010; 81 (7): 073105. https://doi.org/10.1063/1.3458007
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