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Laser frequency noise characterization using high-finesse plano-concave optical microresonators
Optics Letters
|February 1, 2024
Summary
A new method uses optical microresonators to accurately measure laser frequency noise across a broad range. This technique is crucial for advancing optical sensing and communication technologies.
Area of Science:
- Optics and Photonics
- Laser Physics
- Metrology
Background:
- Laser frequency noise characterization is vital for optical sensing and coherent optical communications.
- Existing methods struggle to accurately measure ultra-narrow linewidth lasers across wide frequency ranges.
- High-finesse optical microresonators offer potential as sensitive frequency discriminators.
Purpose of the Study:
- To develop and demonstrate a novel method for characterizing laser frequency noise.
- To overcome the limitations of current techniques in measuring ultra-narrow linewidth lasers.
- To enable wide-range frequency noise measurements using optical microresonators.
Main Methods:
- Utilized a high-finesse plano-concave optical microresonator (PCMR) as a frequency discriminator.
- Fabricated an array of PCMRs with varied thicknesses to cover a broad frequency spectrum.
- Measured frequency noise of four different lasers within the 1440-1630 nm wavelength range.
Main Results:
- Successfully characterized laser frequency noise from 15 Hz to <100 MHz.
- Demonstrated the method's capability across a wide wavelength range (1440-1630 nm).
- Results showed good agreement with a commercial frequency noise analyzer.
Conclusions:
- The PCMR-based method provides accurate and wide-range laser frequency noise characterization.
- This technique enhances capabilities for optical sensing and coherent optical communications.
- The developed method offers a promising alternative to existing frequency noise measurement tools.
