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Dual-dispersion-regime dual-comb mode-locked laser
Optics Letters
|April 1, 2022
Summary
This study introduces the first solid-state dual-comb laser operating in varied dispersion regimes. It generates two distinct pulse trains from a single cavity, enabling dual-comb spectroscopy applications.
Area of Science:
- Laser Physics
- Nonlinear Optics
- Spectroscopy
Background:
- Mode-locked lasers are crucial for generating ultrashort pulses.
- Dual-comb lasers offer unique capabilities for spectroscopy.
- Operating in different dispersion regimes within a single laser cavity presents significant challenges.
Purpose of the Study:
- To demonstrate the first solid-state dual-comb mode-locked laser.
- To achieve simultaneous operation in anomalous and normal dispersion regimes.
- To investigate dual pulse generation with significantly different durations.
Main Methods:
- Utilized a birefringent Ytterbium-doped Calcium Niobium Gallium Silicate (Yb:CNGS) gain medium.
- Engineered the laser cavity to achieve a net group delay dispersion crossing zero across the gain bandwidth.
- Exploited intrinsic polarization multiplexing for dual-comb generation.
Main Results:
- Successfully generated two cross-polarized pulse trains with a repetition rate offset of ~4.8 kHz.
- Achieved dual pulse generation with a 20-fold difference in duration (117 fs vs. 2360 fs).
- Produced soliton-like pulses in the anomalous dispersion regime and chirped pulses in the normal dispersion regime.
Conclusions:
- The developed laser is the first solid-state dual-comb laser operating in different dispersion regimes.
- This dual-comb laser offers a novel platform for advanced spectroscopic techniques.
- The ability to generate pulses of vastly different durations opens new avenues for research.
