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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Homodyne locking of a squeezer.

M Heurs1, I R Petersen, M R James

  • 1School of Engineering and Information Technology, University College, The University of New South Wales, Canberra, ACT 2600, Australia.

Optics Letters
|August 18, 2009
PubMed
Summary
This summary is machine-generated.

We developed a simple homodyne locking technique to stabilize optical parametric oscillator (OPO) frequencies. This method enables precise measurements of phase shifts and sub-quantum-noise-limited outputs for advanced quantum optics applications.

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Area of Science:

  • Quantum Optics
  • Laser Physics
  • Optical Engineering

Background:

  • Stabilizing laser and optical parametric oscillator (OPO) frequencies is crucial for precision measurements.
  • Existing frequency locking techniques can be complex and costly.
  • Sub-quantum-noise-limited (sub-QNL) measurements require highly stable sources.

Purpose of the Study:

  • To implement and validate a novel, cost-effective homodyne locking technique for OPO-based squeezed-vacuum sources.
  • To enable simultaneous measurement of cavity-induced phase shifts and sub-QNL phase quadrature output.
  • To demonstrate a unique sub-QNL frequency discriminator.

Main Methods:

  • Utilized a homodyne detection scheme to monitor phase shifts.
  • Simultaneously measured OPO phase quadrature output below the quantum noise limit.
  • Applied the technique for frequency locking of the OPO and its driving laser.

Main Results:

  • Successfully implemented a cheap and easy-to-use homodyne locking technique.
  • Achieved simultaneous measurement of phase shifts and sub-QNL phase quadrature.
  • Demonstrated the technique's capability as a sub-QNL frequency discriminator.

Conclusions:

  • The homodyne locking technique offers a practical and efficient solution for stabilizing OPO-based quantum sources.
  • This method simplifies subsequent phase-locked homodyne measurements.
  • The technique advances the development of sensitive quantum measurement systems.