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Updated: Feb 2, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
20 GHz actively mode-locked thulium fiber laser
This study demonstrates a high repetition-rate actively mode-locked thulium fiber laser, achieving tunable rates up to 19 GHz. This advancement significantly boosts thulium fiber laser capabilities for advanced applications.
Area of Science:
- Photonics and Laser Technology
- Optical Engineering
Background:
- Actively mode-locked fiber lasers are crucial for generating ultrashort optical pulses.
- Thulium-doped fiber lasers offer unique emission properties in the 2-micron wavelength range.
- Achieving high repetition rates in thulium fiber lasers presents significant challenges.
Purpose of the Study:
- To develop and demonstrate a high repetition-rate actively mode-locked thulium fiber laser.
- To investigate the tunability and pulse characteristics of the laser system.
- To explore the potential for rational harmonic mode-locking in this laser architecture.
Main Methods:
- Utilized an electro-optic lithium niobate phase modulator for longitudinal mode synchronization.
- Implemented active mode-locking in a thulium fiber laser cavity.
- Experimentally varied detuning frequency and modulation signal to control repetition rate and pulse width.
- Investigated rational harmonic mode-locking phenomena.
Main Results:
- Achieved a tunable repetition rate from 14.6 MHz to 19 GHz.
- Demonstrated a 19 GHz pulse output with a 46 dB super-mode suppression ratio.
- Observed rational harmonic mode-locking, generating 14 GHz and 21 GHz pulses from a 7 GHz modulation signal.
- Significantly improved the repetition rate of actively mode-locked thulium fiber lasers by over an order of magnitude.
Conclusions:
- The developed thulium fiber laser achieves unprecedented high repetition rates.
- Pulse width is controllable via detuning frequency and repetition rate adjustments.
- The laser system is suitable for high-speed optical data processing, communication, and remote sensing due to its synchronization capability.
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