The polarization-dependent photon-number squeezing of 1.5 dB from a grating feedback locking quantum-well laser in a cryostat has been experimentally detected with a balanced homodyne detector including an imperfect nonpolarized-beam splitter. The great influence of the birefringence induced at low temperature on the determination of the shot-noise-limit and on the detection of photon-number squeezing is discussed in detail. Birefringence is compensated for by insertion of a half-wave plate of adjustable inclination into the output beam before the polarization components of the optical system.
© 2001 Optical Society of America
Jing Zhang, Tiancai Zhang, Ruifang Dong, Junxiang Zhang, Junmin Wang, Changde Xie, and Kunchi Peng, "Influence of birefringence induced at low temperature on balanced detection of polarization-dependent photon-number squeezing and its optical compensation," J. Opt. Soc. Am. B 18, 1014-1018 (2001)