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Load-frequency control01:28

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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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Note: Efficient diode laser line narrowing using dual, feed-forward + feed-back laser frequency control.

M Lintz1, D H Phung1, J-P Coulon1

  • 1Laboratoire ARTEMIS, Universite Cote d'Azur, Observatoire de la Cote d'Azur, CNRS, Nice 06304, France.

The Review of Scientific Instruments
|March 3, 2017
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Summary
This summary is machine-generated.

We achieved distributed feedback laser diode line narrowing using a feedback loop and feed-forward control. This method efficiently narrows laser spectra to below 4 kHz, improving laser performance.

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Area of Science:

  • Optics and Photonics
  • Laser Physics

Background:

  • Distributed feedback (DFB) laser diodes are crucial for various applications.
  • Achieving narrow spectral linewidth is essential for high-resolution spectroscopy and optical communications.
  • Existing line-narrowing techniques may have limitations in bandwidth or efficiency.

Purpose of the Study:

  • To develop an efficient method for narrowing the spectral linewidth of DFB laser diodes.
  • To investigate a combined feedback and feed-forward control approach for phase correction.
  • To achieve a large phase correction bandwidth and high power utilization.

Main Methods:

  • Simultaneous control of diode current via a feedback loop.
  • Utilizing an external electrooptic phase modulator in a feed-forward actuator.
  • Employing commercial laser control units and a 20 m optical fiber delay compensation.

Main Results:

  • Achieved a large phase correction bandwidth of up to 15 MHz.
  • Successfully narrowed the spectral linewidth of DFB laser diodes to a Full Width at Half Maximum (FWHM) below 4 kHz.
  • Narrowed approximately 98% of the laser power, demonstrating high efficiency.

Conclusions:

  • The combined feedback and feed-forward control strategy is highly effective for DFB laser diode line narrowing.
  • This approach offers a convenient and efficient solution for achieving ultra-narrow laser linewidths.
  • The method is practical due to easy compensation of electronic delays using optical fiber.