Xue-Han MEI, Xiang CHEN, Gang XU, Yuan-Zhong YANG, Zhong ZHANG, Cheng LEI, Sheng LI, Xing-Huan WANG, Du WANG. Time and frequency domain characteristics of a quasi-continuous 2 μm thulium-doped fiber laser[J]. Journal of Infrared and Millimeter Waves, 2025, 44(2): 156
- Journal of Infrared and Millimeter Waves
- Vol. 44, Issue 2, 156 (2025)
Fig. 1. Schematic diagram of the experimental setup of QCW-TDFL（HR：high reflector；OC：output coupler；CPS：cladding power stripper）
Fig. 2. Energy level structure of Tm3+ ions
Fig. 3. Emergence and suppression of relaxation oscillations：（a），（b）observed relaxation oscillations；（c），（d）relaxation oscillations are suppressed
Fig. 4. Output spectra and cross sections of different gain fibers: (a) output spectrum and cross section figure of gain fiber A; (b)output spectrum and cross section figure of gain fiber B
Fig. 5. Mode field distributions of different gain fibers：（a）LP01 of gain fiber A；（b）LP11a of gain fiber A；（c）LP11b of gain fiber A；（d）LP01 of gain fiber B
Fig. 6. Simulation of the relationship between fiber bending diameter and mode limiting loss
Fig. 7. Curves of laser output peak power under different pump peak power at 1 kHz
Fig. 8. Maximum power output pulse train with 10% duty cycle
Fig. 9. Beam quality fitting curves with near-field spot distribution
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