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Optik

Long-term stable bright amplitude-squeezed state of light at 1064 nm for quantum imaging

Fei Feng, Si wen Bi, Bao zhu Lu, Meng Hua Kang

Published Mar 16, 2013• 4 citations
Publisher
DOI
10.1016/j.ijleo.2013.01.005

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Continuous-wave amplitude-squeezed light at 1064 nm has been generated with excellent long-term stability by use of a dual-port type I degenerate optical parametric amplifier pumped by a frequency-doubled Nd:YAG laser. A seed wave at 1064 nm is resonantly injected through the low-transmission cavity port, whereas the parametrically deamplified and squeezed output wave is extracted from the high-transmission port. Amplitude noise reduction of as much as 4.3 dB is observed directly at an output power of 0.15 mW. Stable noise suppression exceeding 3.8 dB is obtained for several hours by phase locking of the pump wave. The longterm stability and simplicity make this device suitable for sub-shot-noise metrology.
A stable amplitude squeezed state light was generated by utilizing the optical parametric down-conversion (OPDC) technique based on periodically poled KTiOPO4(PPKTP) in an optical parametric oscillator (OPO) resonator. We observed a -4.93dB of squeezing in homodyne measurement. The imaging experiments of resolution target were conducted. It shown that the imaging resolution with squeezed state light as light source was 1.26 times that of the resolution with coherent light as light source. The squeezed state light was applied for imaging of real objects and we found that the imaging with squeezed light as light source is more distinct and has less distortion.