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In this research, a diode‐pumped SnS2 passively Q‐switched (PQS) V‐type Tm‐doped pulsed laser was demonstrated. The continuous‐wave (CW) condition without SnS2 saturable absorber (SA) was investigated first. A maximum output power of 1.26W with a slope efficiency of 24.28% was derived at an absorbed pump power of 7.11W under an output coupling of 5%. With the as‐prepared SnS2 SA employed, a series of stable Q‐switched (QS) pulse trains were successfully realized. A minimum pulse width of 3.061 μs and a maximum repetition frequency of 70.42 kHz were generated through an output coupling of 5%, corresponding to a maximum output power of 621 mW. The delivered highest peak power and maximum single pulse energy were 2.90W and 12.41 μJ under an output coupling of 2.5%, respectively. These findings indicated that SnS2 was a promising modulator for 2 μm all‐solid‐state pulsed laser generation. [ABSTRACT FROM AUTHOR]

A saturable absorber based on a novel two‐dimensional (2D) material Bi2O2Se was placed in a resonator with an overall longest diameter of 31 mm to achieve efficient operation of a passively Q‐switched (PQS) Tm:YAP laser for the first time. In PQS mode, a 1.62‐W average output power with a pulse width of 1.24 µs and a pulse repetition of frequency of 112.1 kHz was achieved at the pump power of 22.2 W, corresponding to a peak power of 11.66 W. As a novel 2D material, the results show the potential of Bi2O2Se as a photomodulator in the 2 µm spectral range. [ABSTRACT FROM AUTHOR]

A 2 μm passively Q‐switched Tm:YAP solid‐state laser with MoS2 as saturated absorber was demonstrated in this work. MoS2 two‐dimensional materials were prepared by using the method of chemical vapor deposition. The laser achieved high peak power of 21.2 W and high single pulse energy of 19.5 μJ, while maintaining a short pulse width of 916 ns. This is the first time that the peak power of a Tm:TAP solid‐state laser based on a MoS2 saturated absorber has reached 21.2 W. The beam quality factor was M2x = 1.08 and M2y = 1.10. [ABSTRACT FROM AUTHOR]

A defective molybdenum oxide (MoO3−x) prepared by a hydrothermal and defect engineering approach was spin-coated on the quartz glass and implemented as saturable absorber (SA). The experiment evidenced that MoO3−x based SA can function as an efficient nanosecond pulse generator, servicing Nd3+, Er3+, Tm3+ doped lasers emission at 1.06 1.64 and 1.94 µm. And the shortest pulse duration of 396 ns, 275 ns, and 1.4 μs was achieved on this wavelength with the corresponding maximum peak power of 14.37 W, 33.76 W and 7.94 W. In our study were also observed the optical modulation characteristics as well as the output performance of the passive Q-switch lasers modulated by MoO3−x SA, which indicates that the modulation depths are 6.5%, 7.6% and 5.8%, respectively, while the average output powers 0.79 W, 1.13 W and 1.6 W. The results confirm that the few-layered MoO3−x nanosheets can be a promising candidate for pulse laser generation in wide spectral bands, and they exhibit a great stability in an atmospheric environment and high laser damage threshold, which are beneficial to realizing high power laser output. [ABSTRACT FROM AUTHOR]