Abstract

We report on the first, to the best of our knowledge, passive ${ Q}$-switching operation at 2.3 µm passively based on ${\rm Tm}{:}{{\rm YAIO}_3}$ (Tm:YAP) $^3{{\rm H}_4} \to {^3}{{\rm H}_5}$ transition with sulfur-doped graphitic carbon nitride (${\rm g} \text{-} {\rm g}{{\rm C}_3}{{\rm N}_4}$) as the saturable absorber. Sulfur-doping engineering in ${\rm g} \text{-} {{\rm C}_3}{{\rm N}_4}$ was manifested to enhance its mid-infrared nonlinear saturable absorption characteristics, which was confirmed by the conventional open-aperture ${\rm Z}$-scan experiment with the excitation at 2.3 µm. The large effective nonlinear absorption coefficient of ${\rm S} \text{-} {{\rm gC}_3}{{\rm N}_4}$ was determined to be ${-}{0.68}\;{\rm cm/GW}$, indicating the remarkable MIR optical response. Initiated by ${\rm S} \text{-} {{\rm gC}_3}{{\rm N}_4}$, a passively ${Q}$-switched laser operating at 2274.6 nm was configured with $a$-cut 3.0 at.% Tm:YAP as the gain medium. Stable ${ Q}$-switching pulses were generated with the shortest pulse width of 140 ns, corresponding to the maximum peak power of 21.8 W. The experimental results reveal the effectiveness of sulfur doping to improve the performance of ${\rm g} \text{-} {{\rm C}_3}{{\rm N}_4}$ in the MIR pulse generation.

© 2021 Optical Society of America

2 µm lasing from Tm³⁺-doped PbO-PbF₂-Bi₂O₃-Ga₂O₃ glass microspheres

Jin Yu, Yanqiu Du, Xiaotong Zhao, Shijie Jia, Zhenrui Li, Shunbin Wang, and Pengfei Wang
Opt. Lett. 46(20) 5084-5087 (2021)

Modulation of MXene Nb₂CT_x saturable absorber for passively Q-switched 2.85 µm Er:Lu₂O₃laser

Chenyang Feng, Wenchao Qiao, Yizhou Liu, Jiacheng Huang, Yangyang Liang, Yuefeng Zhao, Yuzhi Song, and Tao Li
Opt. Lett. 46(6) 1385-1388 (2021)

Controllable structural tailoring for enhanced ∼2 µm emission in heavily Tm³⁺-doped germanate glasses

Le Tu, Guowu Tang, Qi Qian, and Zhongmin Yang
Opt. Lett. 46(2) 310-313 (2021)

Graphene mode-locked operation of Tm³⁺:YLiF₄ and Tm³⁺:KY₃F₁₀ lasers near 2.3 µm

Abdullah Muti, Ferda Canbaz, Mauro Tonelli, Ji Eun Bae, Fabian Rotermund, Valentin Petrov, and Alphan Sennaroglu
Opt. Lett. 45(3) 656-659 (2020)

Tm³⁺-doped fluorotellurite glass microsphere resonator laser at 2.3 µm

Pengfei Wang, Yating Yi, Xin Wang, Angzhen Li, Shijie Jia, Yaxian Fan, Gilberto Brambilla, Shunbin Wang, and Haiyan Zhao
Opt. Lett. 45(13) 3553-3556 (2020)