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Dispersion-tuned harmonically mode-locked fiber ring laser for self-synchronization to an external clock
Optics Letters
|November 3, 2009
Summary
This study introduces a novel dispersion-tuned fiber laser for stable, high-repetition-rate operation. It achieves a 10-GHz pulse train with tunable wavelengths, enabling precise pulse control.
Area of Science:
- Optics and Photonics
- Laser Physics
- Fiber Lasers
Background:
- Mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
- Achieving stable, high-repetition-rate operation with tunable wavelengths presents a significant challenge.
Purpose of the Study:
- To report the first stable operation of a dispersion-tuned harmonically mode-locked erbium-doped fiber ring laser.
- To demonstrate wavelength tunability and pulse energy equalization in such a laser system.
Main Methods:
- Utilizing a dispersion-tuned fiber ring laser configuration.
- Employing an external clock for amplitude modulation to maintain synchronism.
- Adjusting cavity length for laser tuning.
- Leveraging normal dispersion, self-phase modulation, and amplitude modulation for pulse energy equalization.
Main Results:
- Achieved stable operation of a high-repetition-rate, dispersion-tuned, harmonically mode-locked erbium-doped fiber ring laser.
- Generated a 10-GHz train of transform-limited pulses with 6.5-ps duration.
- Demonstrated an 8-nm tuning range.
- Showcased pulse energy equalization through the interplay of dispersion and modulation effects.
Conclusions:
- The developed laser offers stable, tunable, high-repetition-rate pulse generation.
- Dispersion tuning provides passive synchronism with the modulation frequency, simplifying laser operation.
- The system demonstrates potential for applications requiring precisely controlled optical pulses.
