Abstract
A compact and portable multi-purpose non-classical light source (volume about 300×400×500 mm 3 ) has been designed and built. A laser diode-pumped intracavity frequency-doubled Nd:YAP/KTP laser and a semi-monolithic non-degenerate optical parametric oscillator (NOPO) are closely integrated on an invar steel base. Above the oscillation threshold of the NOPO (∼3 mW), the twin beams with an intensity quantum correlation of 5.9 dB were obtained; when a signal of subharmonic wave, which is out of phase to the pump field, was injected into the NOPO, bright two-mode quadrature amplitude-squeezed light of 2.1 dB and an EPR beam with amplitude anticorrelation and phase correlation was produced at a pump power of milliwatt order. The features of compactness, portablility, low pump threshold, and versatility make the device useful for developing practical non-classical light sources.
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