Open AccessINTENSITY NOISE SQUEEZING OF LASER DIODE WITH INPHASE EXTERNAL WEAK FEEDBACK BY HALF WAVE PLATE
Author(s) -
Ruifang Dong,
Junxiang Zhang,
Tiancai Zhang,
Jing Zhang,
Changde Xie,
Kunchi Peng
Publication year - 2001
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.50.462
Subject(s) - optics , physics , laser , waveplate , birefringence , photon , polarization (electrochemistry) , diode , collimated light , laser diode , optoelectronics , chemistry
Due to the birefringence effect of the quantum well laser and the collimating lens in a low temperature cryostat, the polarization of the output light was changed, therefore the photon number fluctuation of the output individual linearly polarized mode was increased. By compensating the birefringence with a quarter wave plate, and utilizing an inphase external weak feedback to laser diode laser by means of residuary reflection from the two surfaces of a half wave plate, we obtained the output light of 24mW with the photon number fluctuation 2.8dB below the Standard Quantum Limit at the pump current of 34.65mA.