Abstract
This paper presents the first demonstration of a Q-switched Thulium-doped fiber laser (TDFL) utilizing our newly developed Thulium-doped fiber (TDF) and a MXene niobium carbide - polyethylene oxide (Nb2CTx-PEO) thin film as a gain medium and saturable absorber (SA), respectively. The TDF core glass contains 6.15wt% Al2O3, 2.2wt% Y2O3, 0.47wt% Tm2O3, 2.12wt% GeO2, 1.57wt% HfO2 and 0.05wt% Bi2O3 with the absorption of 30dB/m at 1550nm. The outcome was the realization of a stable pulsed laser operating at a central wavelength of 1888.3nm. The Q-switched pulses exhibited a maximum repetition rate of 46.7kHz and a minimum pulse width of 1.995 µs at a pump power of 731.41mW. The Q-switched operation maintained a signal-to-noise ratio (SNR) of 45dB, confirming its stability. This breakthrough highlights the laser system's potential for diverse applications, including free-space optical communication, spectroscopy, and medical fields.
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