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

Quantum Electronics and Laser Science Conference

Stable bright squeezed light by optical parametric deamplification in a semi-monolithic resonator

Robert Bruckmeier, К. R. Schneider, Hauke Hansen, Stephan Schiller, J. Mlynek

Published Jun 7, 1996• 0 citations
OpenAlex

Abstract

Summary form only given. We report on the development and characterization of a novel source of bright squeezed light based on parametric deamplification of a seed wave. The device is both simple to implement and exhibits excellent temporal stability. A diode-pumped Nd:YAG laser serves as the primary source of the system. Most of the laser power is frequency doubled in a semi-monolithic MgO:LiNbO/sub 3/ standing wave cavity to provide the pump wave at 532 nm for a dual port degenerate optical parametric amplifier (DOPA). The DOPA resonator consists of a MgO:LiNbO/sub 3/-crystal and a concave external mirror mounted on a piezoelectric transducer (PZT). A seed wave at 1064 nm is resonantly injected through the spherically polished endface of the crystal, which is coated with a high reflector at 1064 and 532 nm. Degenerate operation is achieved by stabilization of the cavity length such that the seed wave is resonant. The external mirror, which is highly transmitting at 532 nm and has a reflectivity of 96% at 1064 nm, is used both for incoupling of the pump wave and for extraction of the parametrically deamplified and squeezed output infrared wave. The relative phase between pump and seed wave is stabilized to maximum deamplification by a lock-in technique to ensure stable amplitude squeezing of the DOPA.

Related papers

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

Generation of strongly squeezed continuous-wave light at 1064 nm

Klaus Schneider, M. Lang, J. Mlynek +1 more

A compact and effcient source of amplitude-squeezed light is described. It employs a semi-monolithic degenerate MgO:LiNbO(3) optical parametric amplifier pumped by a frequency-doubled Nd:YAG laser at 532 nm. Injection-seeding of the amplifier by a 1064 nm wave permits active stabilization of the cavity length and stable operation. At a pump power of 380 mW, a maximum noise reduction of 6.5 dB in the amplitude fluctuations of the 0.2 mW 1064 nm wave was detected. The average detected noise reduction in continuous operation over 14 minutes was 6.2 dB. Taking the detection effciency into account, this corresponds to a squeezing of 7.2 dB in the emitted wave.

Optics Express•Feb 2, 1998•71 citations

Generation of squeezed light and its effect on nonlinear optical processes

E. M. Daly, A.S. Bell, Erling Riis +1 more

Summary form only given.We describe the generation and detection of broadband squeezed states at 1047 nm in a lithium triborate (LiB/sub 3/O/sub 5/) degenerate optical parametric amplifier (DOPA). The light source used is a laser-diode-pumped additive pulse mode-locked Nd:LiYF/sub 4/ laser, which produces pulses 3 ps in duration at repetition rate of 140 MHz, and the average output power is 1 W. The fundamental light is frequency doubled in an external ring enhancement cavity, and the resulting high peak power of the doubled light means that it is possible to produce significant squeezing even in a single-pass or traveling-wave parametric amplifier.

Conference on Lasers and Electro-Optics•Nov 27, 2002•0 citations

Analysis of amplitude-squeezed light generation with Gaussian-beam degenerate optical parametric amplifiers

Orhan Aytür

Summary form only given. The generation of quantum states of light, such as squeezed states, often relies on degenerate optical parametric amplification. The input signal in a degenerate optical parametric amplifier (DOPA) may be amplified or deamplified depending on the phase of the signal field relative to that of the pump field (/spl Delta//spl phi/=/spl phi//sub pump/-2/spl phi//sub signal/). We present the results of an accurate numerical DOPA model for the generation of amplitude-squeezed light with Gaussian pump and signal beams. We find that the widely accepted 3-dB limit imposed by the Gaussian beam profiles can actually be exceeded in the tight focusing regime.

Quantum Electronics and Laser Science Conference•May 12, 2000•1 citation

Generation of Long-Term Stable Squeezed Vacuum States Using Dither-Locking Technique

Daohua Wu, Yashuai Han, Xuehua Zhu +1 more

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.

Photonics•Jul 6, 2022•2 citations

A Bright Squeezed Light Source for Quantum Sensing

Wenhai Yang, Wenting Diao, Chunxiao Cai +8 more

The use of optical sensing for in vivo applications is compelling, since it offers the advantages of non-invasiveness, non-ionizing radiation, and real-time monitoring. However, the signal-to-noise ratio (SNR) of the optical signal deteriorates dramatically as the biological tissue increases. Although increasing laser power can improve the SNR, intense lasers can severely disturb biological processes and viability. Quantum sensing with bright squeezed light can make the measurement sensitivity break through the quantum noise limit under weak laser conditions. A bright squeezed light source is demonstrated to avoid the deterioration of SNR and biological damage, which integrates an external cavity frequency-doubled laser, a semi-monolithic standing cavity with periodically poled titanyl phosphate (PPKTP), and a balanced homodyne detector (BHD) assembled on a dedicated breadboard. With the rational design of the mechanical elements, the optical layout, and the feedback control equipment, a maximum non-classical noise reduction of −10.7 ± 0.2 dB is observed. The average squeeze of −10 ± 0.2 dB in continuous operation for 60 min is demonstrated. Finally, the intracavity loss of degenerate optical parametric amplifier (DOPA) and the initial bright squeezed light can be calculated to be 0.0021 and −15.5 ± 0.2 dB, respectively. Through the above experimental and theoretical analysis, the direction of improving bright squeeze level is pointed out.

Chemosensors•Dec 25, 2022•13 citations
Summary form only given. We report on the development and characterization of a novel source of bright squeezed light based on parametric deamplification of a seed wave. The device is both simple to implement and exhibits excellent temporal stability. A diode-pumped Nd:YAG laser serves as the primary source of the system. Most of the laser power is frequency doubled in a semi-monolithic MgO:LiNbO/sub 3/ standing wave cavity to provide the pump wave at 532 nm for a dual port degenerate optical parametric amplifier (DOPA). The DOPA resonator consists of a MgO:LiNbO/sub 3/-crystal and a concave external mirror mounted on a piezoelectric transducer (PZT). A seed wave at 1064 nm is resonantly injected through the spherically polished endface of the crystal, which is coated with a high reflector at 1064 and 532 nm. Degenerate operation is achieved by stabilization of the cavity length such that the seed wave is resonant. The external mirror, which is highly transmitting at 532 nm and has a reflectivity of 96% at 1064 nm, is used both for incoupling of the pump wave and for extraction of the parametrically deamplified and squeezed output infrared wave. The relative phase between pump and seed wave is stabilized to maximum deamplification by a lock-in technique to ensure stable amplitude squeezing of the DOPA.
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 compact and effcient source of amplitude-squeezed light is described. It employs a semi-monolithic degenerate MgO:LiNbO(3) optical parametric amplifier pumped by a frequency-doubled Nd:YAG laser at 532 nm. Injection-seeding of the amplifier by a 1064 nm wave permits active stabilization of the cavity length and stable operation. At a pump power of 380 mW, a maximum noise reduction of 6.5 dB in the amplitude fluctuations of the 0.2 mW 1064 nm wave was detected. The average detected noise reduction in continuous operation over 14 minutes was 6.2 dB. Taking the detection effciency into account, this corresponds to a squeezing of 7.2 dB in the emitted wave.
Summary form only given.We describe the generation and detection of broadband squeezed states at 1047 nm in a lithium triborate (LiB/sub 3/O/sub 5/) degenerate optical parametric amplifier (DOPA). The light source used is a laser-diode-pumped additive pulse mode-locked Nd:LiYF/sub 4/ laser, which produces pulses 3 ps in duration at repetition rate of 140 MHz, and the average output power is 1 W. The fundamental light is frequency doubled in an external ring enhancement cavity, and the resulting high peak power of the doubled light means that it is possible to produce significant squeezing even in a single-pass or traveling-wave parametric amplifier.
Summary form only given. The generation of quantum states of light, such as squeezed states, often relies on degenerate optical parametric amplification. The input signal in a degenerate optical parametric amplifier (DOPA) may be amplified or deamplified depending on the phase of the signal field relative to that of the pump field (/spl Delta//spl phi/=/spl phi//sub pump/-2/spl phi//sub signal/). We present the results of an accurate numerical DOPA model for the generation of amplitude-squeezed light with Gaussian pump and signal beams. We find that the widely accepted 3-dB limit imposed by the Gaussian beam profiles can actually be exceeded in the tight focusing regime.
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.
The use of optical sensing for in vivo applications is compelling, since it offers the advantages of non-invasiveness, non-ionizing radiation, and real-time monitoring. However, the signal-to-noise ratio (SNR) of the optical signal deteriorates dramatically as the biological tissue increases. Although increasing laser power can improve the SNR, intense lasers can severely disturb biological processes and viability. Quantum sensing with bright squeezed light can make the measurement sensitivity break through the quantum noise limit under weak laser conditions. A bright squeezed light source is demonstrated to avoid the deterioration of SNR and biological damage, which integrates an external cavity frequency-doubled laser, a semi-monolithic standing cavity with periodically poled titanyl phosphate (PPKTP), and a balanced homodyne detector (BHD) assembled on a dedicated breadboard. With the rational design of the mechanical elements, the optical layout, and the feedback control equipment, a maximum non-classical noise reduction of −10.7 ± 0.2 dB is observed. The average squeeze of −10 ± 0.2 dB in continuous operation for 60 min is demonstrated. Finally, the intracavity loss of degenerate optical parametric amplifier (DOPA) and the initial bright squeezed light can be calculated to be 0.0021 and −15.5 ± 0.2 dB, respectively. Through the above experimental and theoretical analysis, the direction of improving bright squeeze level is pointed out.