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Cancellation of laser dither modulation from optical frequency standards
Optics Letters
|December 7, 2007
Summary
We successfully removed dither modulation from an iodine-stabilized He-Ne laser, significantly reducing linewidth and measurement errors. This advancement simplifies locking to laser frequency standards.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Laser Physics and Technology
Background:
- Iodine-stabilized He-Ne lasers are crucial frequency standards.
- Dither modulation is commonly used for stabilization but introduces measurement complexities.
Purpose of the Study:
- To demonstrate a method for removing dither modulation from iodine-stabilized He-Ne lasers.
- To improve the precision and ease of use of these laser frequency standards.
Main Methods:
- Utilized a frequency-modulated acousto-optic modulator.
- Implemented feed-forward techniques for dither suppression.
Main Results:
- Reduced the beat linewidth between two He-Ne lasers from 6 MHz to 8 kHz.
- Achieved an undithered beat linewidth of approximately 7 kHz.
- Significantly decreased counter errors caused by dither modulation.
Conclusions:
- Dither suppression enhances the utility of laser frequency standards.
- The developed technique simplifies the process of locking to these standards.
- This method offers improved accuracy in beat measurements.
