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INTENSITY SQUEEZING WITH TWIN LASER BEAMS

Claude Fabre, E. Giacobino, Serge Reynaud, R. J. Horowicz, Thierry Debuisschert, A. Heidmann

Published Jul 18, 1988• 0 citations
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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.