No abstract

A high power and efficiency b-cut Tm, Ho:YAlO3 (YAP) laser is reported in this letter. The laser operated in continuous-wave (CW) mode at 2.12 μm. The Tm, Ho:YAP crystal was cooled at a temperature of 77 K and pumped by two fibre-coupled laser diodes with centre output wavelengths of 794.1 and 794.0 nm. A 15.0 W output power was obtained at a 155 mm physical cavity length with an optical–optical conversion efficiency of 39.2%, corresponding to a slope efficiency of 41.1%.

A passively Q-switched (PQS) operation of Tm,Ho:LuVO 4 laser is experimentally demonstrated with a graphene saturable absorber (SA) mirror. An average output power of 1034 mW at 54.5 kHz is acquired with an 8% optical-optical conversion efficiency. The energy per pulse of 40.4 µJ and a peak power of 56.07 W are achieved; the narrowest pulse width of 300 ns is acquired, and the output wavelengths of Tm,Ho:LuVO 4 are 2075.02 nm in a continuous wave (CW) regime and 2057.03 nm in a PQS regime.

A passive Q-switching operation of 2 µm a-cut Tm,Ho:YAP laser was experimentally demonstrated with a WS2 saturable absorber (SA) mirror. An average output power of 696 mW and a peak power of 1.79 W were acquired with the pump power of 9.26 W, corresponding to pulse widths of 9.1 and 5.6 µs and the optical-optical conversion efficiencies of 7.5% and 4.1%. The beam quality factors of and were measured at the output power of 2600 mW.