Both vacuum-squeezed and bright amplitude-squeezed states of light are experimentally generated from a frequency doubler with a semimonolithic Fabry-Perot configuration consisting of a type II nonlinear crystal and a concave mirror. Vacuum squeezing of 3.2±0.1 dB and amplitude squeezing of 1.3±0.2 dB are obtained simultaneously at a pump power of 8 mW. The two quadrature-squeezed optical fields that are generated are of identical frequency at 1080-nm wavelength and orthogonal polarization. Optimizing the input pump power by 19 mW yields as much as 5.0±0.2 dB of maximum vacuum squeezing. The advantages of the system are its simplicity and multiple utility.
© 2005 Optical Society of America
Yu Luo, Ying Li, Changde Xie, Qing Pan, and Kunchi Peng, "Simultaneous experimental generation of vacuum squeezing and bright amplitude squeezing from a frequency doubler," Opt. Lett. 30, 1491-1493 (2005)