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Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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Published on: May 30, 2014

Note: using an optical phase-locked loop in heterodyne velocimetry.

Tianjiong Tao1, Xiang Wang, Heli Ma

  • 1National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, Mianyang, Sichuan 621900, China. tjtao@caep.ac.cn

The Review of Scientific Instruments
|August 2, 2013
PubMed
Summary
This summary is machine-generated.

An optical phase-locked loop enhanced heterodyne velocimetry for precise measurements. This method achieves high velocity and temporal resolution for transient processes like elastic wave vibrations.

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Area of Science:

  • Optics
  • Laser Physics
  • Materials Science

Background:

  • Heterodyne velocimetry is crucial for measuring transient phenomena.
  • Achieving simultaneous high precision and temporal resolution remains a challenge.

Purpose of the Study:

  • To introduce an optical phase-locked loop (OPLL) for heterodyne velocimetry.
  • To enhance precision and temporal resolution in measuring transient surface vibrations.

Main Methods:

  • Implemented an OPLL to lock the beat frequency between a fiber laser and an external cavity diode laser.
  • Utilized 1550 nm light for measurements.
  • Performed proof-of-principle experiments on steel films with submillimeter thicknesses.

Main Results:

  • Achieved beat frequency uncertainty < 1 MHz, translating to velocity uncertainty of 0.1 m/s.
  • Measured surface velocity fluctuations with amplitudes of ~2 m/s and periods of tens of nanoseconds.
  • Analyzed wave propagation times and sound velocities at a 0.5 μs time scale.

Conclusions:

  • The OPLL-enhanced heterodyne velocimetry enables simultaneous high-precision (0.1 m/s) and high-temporal (nanoseconds) resolution measurements.
  • Successfully demonstrated the technique for analyzing elastic wave dynamics in thin films.
  • The method is suitable for probing rapid surface velocity changes in transient processes.