Generation of a stable low-frequency squeezed vacuum field with periodically poled KTiOPO4 at 1064 nm
Abstract
We report the generation of a stable continuous-wave low-frequency squeezed vacuum field with a squeezing level of 7.4±0.1 dB at 1064 nm, the wavelength at which laser-interferometric gravitational wave (GW) detectors operate, using periodically poled KTiOPO4 (PPKTP) in a subthreshold optical parametric oscillator. The squeezing was observed in a broad band of frequencies above 700 Hz where the sensitivity of the currently operational GW detectors is limited by shot noise. PPKTP has the advantages of higher nonlinearity, smaller pump-induced seed absorption, and wider temperature tuning range than alternative nonlinear materials such as MgO-doped or periodically poled LiNbO3, and is, therefore, an excellent material for generation of squeezed vacuum fields for application to laser interferometers for GW detection.
Additional Information
© 2008 Optical Society of America. Received July 31, 2007; accepted November 21, 2007; posted December 5, 2007 (Doc. ID 85919); published January 3, 2008. We thank our colleagues at the LIGO Laboratory and our collaborators at the Australian National University. We are especially grateful to C. Wipf for design and fabrication of the balanced photodetector and to K. McKenzie for valuable comments. We also thank A. Furusawa at University of Tokyo for encouraging use of PPKTP. We gratefully acknowledge support from National Science Foundation grants PHY-0107417 and PHY-0457264.Files
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Additional details
- Eprint ID
- 9726
- Resolver ID
- CaltechAUTHORS:GODol08
- Created
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2008-03-11Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field