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Updated: Apr 6, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Utilizing weak pump depletion to stabilize squeezed vacuum states.

T Denker, D Schütte, M H Wimmer

|July 21, 2015

Summary

This summary is machine-generated.

Researchers developed a new pump-phase locking technique for optical parametric oscillators (OPOs) using weak pump depletion. This method reads phase information from the pump beam without affecting the squeezed light output.

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Area of Science:

Quantum optics
Nonlinear optics
Laser physics

Background:

Sub-threshold optical parametric oscillators (OPOs) are crucial for generating squeezed light.
Maintaining phase stability between the pump and seed beams is essential for OPO performance.
Weak pump depletion (WPD) is an inherent effect in OPOs, often disregarded.

Purpose of the Study:

To propose and demonstrate a novel pump-phase locking technique for sub-threshold OPOs.
To utilize the typically neglected weak pump depletion (WPD) effect for phase locking.
To achieve pump-phase lock without degrading the generated squeezed states.

Main Methods:

Implementing a pump-phase locking technique exploiting weak pump depletion (WPD).
Utilizing the nonlinear interaction within the OPO crystal to imprint phase information.
Reading out the phase difference between the pump and seed beams without disturbing the output.

Main Results:

Experimental demonstration of a pump-phase lock using the WPD technique.
Observation of squeezing levels of 1.96 ± 0.01 dB.
Measured anti-squeezing levels of 3.78 ± 0.02 dB.

Conclusions:

The proposed technique successfully achieves pump-phase lock by leveraging pre-existing phase information in the pump field.
This method provides the first experimental realization of pump-phase locking via WPD.
The technique does not compromise the quality of the detected squeezed states.