Optics Letters

Generation and application of twin beams from an optical parametric oscillator including an ?-cut KTP crystal

Jiangrui Gao, Fuyun Cui, Chenyang Xue, Changde Xie, Peng Kunchi

Published Jun 1, 1998• 85 citations

Abstract

Measurement slight amounts of absorption of light with accuracy beyond the standard quantum limit has been experimentally demonstrated. The quantum-correlated twin beams used in the measurement were generated from a nondegenerate optical parametric oscillator including an alpha-cut KTiOPO(4) crystal pumped by an intracavity frequency-doubled Nd:YAG laser. The noise in the intensity difference between the twin beams was reduced by 88% below the standard quantum limit (SQL). The signal-to-noise ratio was improved by 7 dB with respect to the SQL of the total light employed in the experiment and by 4 dB with respect to that of the signal light.

DOI: 10.1364/ol.23.000870

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