利用双色本振光测量真空压缩

We present the experimental measurement of a squeezed.vacuum state by means of a bichromatic local oscillator.(BLO). A pair of local oscillators at 5 MHz around the.central frequency ω0 of the fundamental field with equal.power are generated by three acousto-optic modulators.and phase-locked technology and used as a BLO. The.squeezed vacuum light is detected by a phase-sensitive.balanced-homodyne detection with a BLO. The baseband.signal around ω0 combined with a broad squeezed field.can be dete