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Nonclassical light successfully emitted from an optical parametric oscillator pumped by a frequency-doubled diode laser

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September 1, 2004

 Narrow-band green coherent radiation has been successfully generated by a low-cost, small-sized and robust frequency doubled diode laser instead of a conventional frequency-doubled YAG laser. The non-critical phase matching condition is exploited by combining a 50mW diode laser at 1080nm with an a-cut KTP crystal. Green coherent radiation at 540nm in an ideal Gaussian beam profile is obtained with a conversion efficiency of 51.6%. Resonant optical feedback guarantees intensity fluctuation less than 0.3% and a linewidth less than 82kHz. The green radiation was used to pump an optical parametric oscillator comprising of an a-cut KTP crystal to yield 5.1mW of quantum-correlated twin beams exhibiting intensity-difference squeezing of 63%. This is the first demonstration of generation of non-classical light by a frequency-doubled diode laser. Generation of non-classical light by diode laser is advantageous in versatile, efficient, compact and low-cost quantum communications.

Related new resources
News Breaks in "Laser Focus World", Sep. 1. 2004

Original papers
Optics Express 12, 3567 (2004)
Optics Letters 29, 1665 (2004)

Quantum ICT Advanced Development Center