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Phase-stabilized all-fiber-based mode-filtering technique for generating a gigahertz frequency comb.
Optics Express
|July 19, 2020
Summary
A new all-fiber technique generates a gigahertz-repetition-rate fiber frequency comb. This method achieves high side-mode suppression and stable cavity length for advanced applications.
Area of Science:
- Photonics and Optical Engineering
- Laser Physics
Background:
- Fiber-based frequency combs are crucial for precision measurements.
- Generating high-repetition-rate combs with high spectral purity remains a challenge.
Purpose of the Study:
- To develop an all-fiber mode-filtering technique for gigahertz-repetition-rate fiber frequency combs.
- To enhance the side-mode suppression ratio and stabilize the cavity length.
Main Methods:
- Utilized an all-fiber mode-filtering approach.
- Incorporated a thermally diffused expanded core fiber to minimize splice loss.
- Applied the Pound-Drever-Hall stabilization technique for resonance frequency locking.
Main Results:
- Successfully generated a gigahertz-repetition-rate fiber frequency comb with a multiplication factor of 21.
- Achieved a high side-mode suppression ratio of approximately 65 dB.
- Demonstrated stabilized fiber cavity length locked to the comb mode.
Conclusions:
- The developed all-fiber mode-filtering technique offers a robust method for generating high-repetition-rate frequency combs.
- The technique's high spectral purity and stability make it suitable for various demanding applications.
- This advancement is expected to be valuable for applications requiring precise optical frequency standards.
