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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Design an active imaging system using squeezed state light

Xuling Lin, BI Si-wen, Song Yang, Zhiqiang Wu, Baohua Wang, Chao Wang, Ningjuan Ruan, Jian Ci

Published Nov 25, 2014• 0 citations
Publisher

Abstract

Squeezed light is an important non-classical light field. In this paper, we demonstrated a designed active imaging system which use squeezed state light instead of coherent light as light source. The squeezed state light is generated by utilizing the degenerate optical parametric amplifier based on periodically poled KTiOPO4 crystal. In order to obtain better imaging results, microlens arrays are used for homogenizing the squeezed light. We describe experiment setup and present some design result.

DOI
10.1117/12.2071173

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Squeezed light is an important non-classical light field. In this paper, we demonstrated a designed active imaging system which use squeezed state light instead of coherent light as light source. The squeezed state light is generated by utilizing the degenerate optical parametric amplifier based on periodically poled KTiOPO4 crystal. In order to obtain better imaging results, microlens arrays are used for homogenizing the squeezed light. We describe experiment setup and present some design result.
Squeezed states of optical fields are important resources for photonic quantum application and have been widely discussed and experimentally studied. Stable amplitude squeezed state light with a noise reduction of-3.97dB was generated based on periodically poled KTiOPO4 in an optical parametric oscillator (OPO) resonator by utilizing the optical parametric down-conversion (OPDC) technique. The imaging experiments of resolution target has shown that the imaging resolution with squeezed state light as light source is 1.25times that of that with coherent light and the quality of the imaging with squeezed light as light source is better.
A stable amplitude squeezed-state light was generated by utilizing the nondegenerate optical parametric amplifier based on periodically poled KTiOPO4 crystal at 1064 nm. We observed −4.93 dB of squeezing with a local oscillator phase locked in homodyne measurement. The imaging experiments of the resolution target have shown that the imaging resolution, which was based on squeezed-state light, is 1.41 times as much as the resolution that was acquired using coherent light as light source. In addition, the squeezed-state light was applied for imaging of the virtual object. It was found that the characters on the board were much more easily discerned with squeezed light as a light source than with coherent light. This result paves the way for further improvements of imaging resolution by use of the squeezed-state light.
Stable, low noise, infrared squeezed state tight at 1064 nm is generated by utilizing optical parametric down-conversion (OPDC) technique based on periodically poled KTiOPO 4 in a optical parametric amplifier (OPA) resonator. A non-classical noise reduction of 2.58 dB below the shot noise is observed through balanced homodyne detection. The squeezed state light is used to set up an imaging system for high-resolution imaging, and it is found that the resolution of image based on the amplitude-squeezed light is 1.26 times larger than that of infrared coherent light under the same intensity. The experimental results indicate that squeezed light is an important non-classical light, which can overcome the coherent laser shot-noise, the classical diffraction limit and limit of quantum noise.
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.
We report the generation of long-term stable squeezed vacuum states at 1064 nm using a degenerate optical parametric amplifier (DOPA) with a periodically poled KTiOPO4 crystal (PPKTP). The OPA is pumped by a 532 nm light produced by frequency doubling the fundamental light with a bow-tie enhancement second harmonic generator (SHG). When the DOPA and relative phases are locked using a dither-locking method, the squeezed vacuum states are stably measured over 2 h at 11 MHz. The highly compact and simple squeezed light source is suitable for applications in quantum optics experiments.