Tunable and passively Q-switched laser operation of Tm:CaYAlO4 between 1848 nm and 1876 nm

High-Power Acoustic-Optical Q-Switched 1.83 µm Tm-Doped Bulk Laser

“…In 2008, a 1.835 µm Tm:YLF laser was realized with an output power below 1 W using a birefringent filter [19]. In 2019, a tunable Tm:CaYAlO 4 laser was reported based on a YAG etalon, but the output power was under 2 W over the entire wavelength range between 1848 nm and 1876 nm [20]. In addition, it has been proven that controlling the transmittance of the output coupler (OC) can efficiently generate a 1.8 µm laser, but the output power scaling is still constrained below 10 W. For example, in 2019, Na et al demonstrated a high-efficiency 1.83 µm Tm:YLF laser with a continuous-wave (CW) output power of 8.5 W by utilizing handpicked output couplers [21].…”

Passively Q-switched Tm/Ho composite laser

“…With the development of 2 μm saturable absorbers, such as 1D materials (single wall carbon nanotube and gold nanorod) 14,15 , 2D materials (graphene, topological insulators, and ternary chalcogenides) [16][17][18] , and transition metal ion-doped II-VI crystals (Cr 2+ :ZnSe, Cr 2+ :ZnS) 19,20 , passively Q-switching (PQS) in 2 μm Tm-doped and Ho-doped lasers has become a hot topic, which is characterized by compactness, easy implementation, and cost-saving compared with the actively Q-switching (AQS) manners. Among the above SAs, Cr 2+ :ZnSe/ZnS crystals were demonstrated to be robust for achieving higher pulse energy and better PQS stability 19 , owing to the mature crystal growth process with fewer defects.…”