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Passive Q-switched mode-locked self-sweeping fiber laser
Optics Letters
|January 31, 2025
Summary
This study demonstrates a novel passive Q-switched mode-locked (QML) fiber laser that exhibits self-sweeping wavelength. This laser generates microsecond pulses with tunable nanosecond sub-pulses, advancing pulsed laser technology.
Area of Science:
- Optics and Photonics
- Laser Physics
Background:
- Mode-locked lasers are crucial for various applications.
- Wavelength sweeping in lasers is often achieved actively.
- Passive Q-switched mode-locking (QML) offers simpler laser designs.
Purpose of the Study:
- To demonstrate a passive Q-switched mode-locked (QML) fiber laser with self-induced wavelength sweeping.
- To characterize the pulse properties and spectral dynamics of the QML laser.
Main Methods:
- Utilized a figure-of-nine cavity configuration.
- Employed an Ytterbium-doped fiber as the gain medium.
- Observed and measured pulse trains and spectral output.
Main Results:
- Successfully generated QML pulses with microsecond envelope and nanosecond sub-pulses (3 ns duration).
- Achieved self-induced wavelength sweeping over a range of 5 nm near 1075 nm.
- Observed approximately 60 phase-locked longitudinal modes contributing to the nanosecond pulses.
Conclusions:
- This work presents the first demonstration of a passive QML laser with inherent wavelength self-sweeping.
- The findings expand the understanding of self-sweeping phenomena in lasers.
- The developed laser is potentially useful for applications needing tunable pulsed radiation.
