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Compact diffraction grating laser wavemeter with sub-picometer accuracy and picowatt sensitivity using a webcam

James D White1, Robert E Scholten

  • 1ARC Centre of Excellence for Coherent X-ray Science, School of Physics, The University of Melbourne, 3010 Victoria, Australia.

The Review of Scientific Instruments
|December 5, 2012
PubMed
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A new compact instrument uses a diffraction grating and webcam to measure laser wavelength with 0.7 pm accuracy. This device can resolve rubidium absorption spectra and detect multimode laser operation.

Area of Science:

  • * Atomic, Molecular, and Optical Physics
  • * Laser Spectroscopy
  • * Instrumentation and Measurement

Background:

  • * Accurate laser wavelength measurement is crucial for precision spectroscopy and atomic physics experiments.
  • * Existing wavemeters, such as interferometric types, can be complex and may not readily reveal multimode laser behavior.

Purpose of the Study:

  • * To develop a compact, high-accuracy laser wavelength measuring instrument.
  • * To create a cost-effective alternative to traditional wavemeters.
  • * To enable clear visualization of multimode laser operation.

Main Methods:

  • * Utilized a compact diffraction grating and a consumer-grade webcam for wavelength measurement.
  • * Employed a low optical power threshold (1 pW).

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  • * Demonstrated the instrument's capability with rubidium absorption spectra.

    • Main Results:

    • * Achieved an absolute accuracy of 0.7 pm.
    • * Successfully resolved individual hyperfine transitions of the rubidium absorption spectrum.
    • * Clearly distinguished between single-mode and multimode laser operation, unlike interferometric methods.

    Conclusions:

    • * The developed instrument offers a compact, accurate, and cost-effective solution for laser wavelength measurement.
    • * Its ability to reveal multimode operation makes it ideal for external cavity diode lasers and atom cooling/trapping experiments.
    • * This technology advances precision measurements in optical physics and related fields.