Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Acta Physica Sinica

EXPERIMENTAL INVESTIGATION ABOUT THE GENERATION SYSTEM OF MULTIPLE NONCLASSICAL LIGHTS

Qing Pan, WANG HAI, Yun Zhang, SU HONG, Changde Xie, Kunchi Peng, Zhenggang Yu, Lu Qingming, (1)山东大学化学学院，济南 250100; (2)山西大学光电子研究所，太原 030006

Published Jan 1, 1998• 1 citation
Publisher

Abstract

The configuration of a semimonolithic continuous nondegenerate optical parameter oscillator consisting of an α-cut KTP crystal pumped by an intracavity frequency-doubled and frequency-stabilized Nd∶YAP laser is designed. Both two-mode quadrature-phase squeezing of 3.7dB and intensity-difference squeezing of 7dB have been generated from the cw-NOPO operating respectively below and above the oscillation threshold. The system can operate stably to generate the squeezed light for over half an hour.

DOI
10.7498/aps.47.1625

Related papers

Experimental Investigation of Intensity Difference Squeezing at 1.3 μm-Quantum Communication Window

郑耀辉 Zheng Yaohui

The stable red laser,which is generated by the laser at 1.3 μm wavelength from an all-solid-state single frequency infrared laser pumping a frequency-doubler,is used to pump a continuous wave nondegenerate optical parametric oscillator(cw-NOPO) consisting of LBO crystal with type-Ⅱ non-critical phase matching.The intensity-difference squeezing of 3.9 dB at a telecommunication wavelength has been generated from the cw-NOPO operating above the oscillation threshold through the frequency down-conversion process.

Acta Sinica Quantum Optica•Jan 1, 2010•0 citations

Stable nondegenerate optical parametric oscillation at degenerate frequencies in Na:KTP

Sheng Feng, Olivier Pfister

We report the realization of a light source specifically designed for the generation of bright continuous-variable entangled beams and for Heisenberg-limited inteferometry. The source is a nondegenerate, single-mode, continuous-wave optical parametric oscillator in Na:KTP, operated at frequency degeneracy and just above threshold, which is also of interest for the study of critical fluctuations at the transition point. The residual frequency-difference jitter is ±150 kHz for a 3 MHz cold cavity half width at half maximum. We observe 4 dB of photon-number-difference squeezing at 200 kHz. The Na:KTP crystal is noncritically phase matched for a 532 nm pump and polarization crosstalk is therefore practically nonexistent.

arXiv:quant-ph/0212113•Journal of Optics B Quantum and Semiclassical Optics•Apr 28, 2003•19 citations

Stable nondegenerate optical parametric oscillation at degenerate frequencies in Na: KTP

Sheng Feng, Olivier Pfister

We report the realization of a light source specifically designed for the generation of bright continuousvariable entangled beams and for Heisenberg-limited inteferometry. The source is a nondegenerate, singlemode, continuous-wave optical parametric oscillator in Na:KTP, operated at frequency degeneracy and just above threshold, which is also of interest for the study of critical fluctuations at the transition point. The residual frequency-difference jitter is ± 150 kHz for a 3 MHz cold cavity half-width at half maximum. We observe 4 dB of photon-number-difference squeezing at 200 kHz. The Na:KTP crystal is noncritically phase-matched for a 532 nm pump and polarization crosstalk is therefore practically nonexistent. 1

•Dec 19, 2002•20 citations

Bright squeezed-light generation by a continuous-wave semimonolithic parametric amplifier

K. Schneider, Robert Bruckmeier, Hauke Hansen +2 more

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.

Optics Letters•Sep 1, 1996•64 citations

Application of an all-solid-state, frequency-doubled Nd:YAP laser to the generation of twin beams at 1080 nm

Ruixiang Guo, Julien Laurat, Jiangrui Gao +2 more

A laser-diode-pumped intracavity frequency-doubled Nd:YAP/KTP laser is presented. Over 110 mw of TEM00 single-frequency output power at 540-nm wavelength was obtained. The output green laser was employed to pump a semimonolithic nondegenerate optical parametric oscillator to produce intensity quantum correlated twin beams at 1080 nm, and the maximum quantum noise squeezing of 74% (5.9dB) on the intensity difference fluctuation between the twin beams is observed. The threshold was reduced and the stability was increased significantly when compared with similar lamp-pumped systems.

arXiv:quant-ph/0512033•Applied Optics•Apr 20, 2002•8 citations

Simultaneous experimental generation of vacuum squeezing and bright amplitude squeezing from a frequency doubler

Yu Luo, Ying Li, Changde Xie +2 more

Both vacuum-squeezed and bright amplitude-squeezed states of light are experimentally generated from a frequency doubler with a semimonolithic Fabry-Perot configuration consisting of a type II nonlinear crystal and a concave mirror. Vacuum squeezing of 3.2 +/- 0.1 dB and amplitude squeezing of 1.3 +/- 0.2 dB are obtained simultaneously at a pump power of 8 mW. The two quadrature-squeezed optical fields that are generated are of identical frequency at 1080-nm wavelength and orthogonal polarization. Optimizing the input pump power by 19 mW yields as much as 5.0 +/- 0.2 dB of maximum vacuum squeezing. The advantages of the system are its simplicity and multiple utility.

Optics Letters•Jun 15, 2005•3 citations
The configuration of a semimonolithic continuous nondegenerate optical parameter oscillator consisting of an α-cut KTP crystal pumped by an intracavity frequency-doubled and frequency-stabilized Nd∶YAP laser is designed. Both two-mode quadrature-phase squeezing of 3.7dB and intensity-difference squeezing of 7dB have been generated from the cw-NOPO operating respectively below and above the oscillation threshold. The system can operate stably to generate the squeezed light for over half an hour.
The stable red laser,which is generated by the laser at 1.3 μm wavelength from an all-solid-state single frequency infrared laser pumping a frequency-doubler,is used to pump a continuous wave nondegenerate optical parametric oscillator(cw-NOPO) consisting of LBO crystal with type-Ⅱ non-critical phase matching.The intensity-difference squeezing of 3.9 dB at a telecommunication wavelength has been generated from the cw-NOPO operating above the oscillation threshold through the frequency down-conversion process.
We report the realization of a light source specifically designed for the generation of bright continuous-variable entangled beams and for Heisenberg-limited inteferometry. The source is a nondegenerate, single-mode, continuous-wave optical parametric oscillator in Na:KTP, operated at frequency degeneracy and just above threshold, which is also of interest for the study of critical fluctuations at the transition point. The residual frequency-difference jitter is ±150 kHz for a 3 MHz cold cavity half width at half maximum. We observe 4 dB of photon-number-difference squeezing at 200 kHz. The Na:KTP crystal is noncritically phase matched for a 532 nm pump and polarization crosstalk is therefore practically nonexistent.
We report the realization of a light source specifically designed for the generation of bright continuousvariable entangled beams and for Heisenberg-limited inteferometry. The source is a nondegenerate, singlemode, continuous-wave optical parametric oscillator in Na:KTP, operated at frequency degeneracy and just above threshold, which is also of interest for the study of critical fluctuations at the transition point. The residual frequency-difference jitter is ± 150 kHz for a 3 MHz cold cavity half-width at half maximum. We observe 4 dB of photon-number-difference squeezing at 200 kHz. The Na:KTP crystal is noncritically phase-matched for a 532 nm pump and polarization crosstalk is therefore practically nonexistent. 1
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 laser-diode-pumped intracavity frequency-doubled Nd:YAP/KTP laser is presented. Over 110 mw of TEM00 single-frequency output power at 540-nm wavelength was obtained. The output green laser was employed to pump a semimonolithic nondegenerate optical parametric oscillator to produce intensity quantum correlated twin beams at 1080 nm, and the maximum quantum noise squeezing of 74% (5.9dB) on the intensity difference fluctuation between the twin beams is observed. The threshold was reduced and the stability was increased significantly when compared with similar lamp-pumped systems.
Both vacuum-squeezed and bright amplitude-squeezed states of light are experimentally generated from a frequency doubler with a semimonolithic Fabry-Perot configuration consisting of a type II nonlinear crystal and a concave mirror. Vacuum squeezing of 3.2 +/- 0.1 dB and amplitude squeezing of 1.3 +/- 0.2 dB are obtained simultaneously at a pump power of 8 mW. The two quadrature-squeezed optical fields that are generated are of identical frequency at 1080-nm wavelength and orthogonal polarization. Optimizing the input pump power by 19 mW yields as much as 5.0 +/- 0.2 dB of maximum vacuum squeezing. The advantages of the system are its simplicity and multiple utility.