Phys. Rev. Lett. 82, 5225–5228 (1999)Sub-Shot-Noise-Limited Optical Heterodyne Detection Using an Amplitude-Squeezed Local OscillatorReceived 1 February 1999; published in the issue dated 28 June 1999 We experimentally demonstrate a novel sub-shot-noise-limited heterodyne detection scheme to measure a weak optical signal field by employing amplitude-squeezed light as the local oscillator (LO) field. The amplitude-squeezed LO field at 428.8 nm is generated from a high efficiency single-pass second-harmonic generation in a KNbO3 crystal pumped by femtosecond (130 fs) pulses at 857.6 nm, and the signal field is combined with the generated squeezed LO field through the crystal. An enhancement of 0.7 dB (1.4 dB inferred) in signal-to-noise ratio beyond the shot-noise limit is directly observed. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.5225
DOI:
10.1103/PhysRevLett.82.5225
PACS:
42.50.Dv, 42.50.Lc, 42.68.Wt
See AlsoComment: T. C. Ralph, Can Signal-To-Noise Be Improved by Heterodyne Detection Using an Amplitude Squeezed Local Oscillator?, Phys. Rev. Lett. 85, 677 (2000). Reply: Yongqing Li, Dorel Guzun, and Min Xiao, Li, Guzun, and Xiao Reply:, Phys. Rev. Lett. 85, 678 (2000). |
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