A continuous-wave b-cut Tm, Ho:YAlO₃ laser with a 15 W output pumped by two laser diodes

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%.

Passive Q-switched operation of an a-cut Tm,Ho:YAP laser with a few-layer WS2 saturable absorber

“…The output powers of 730 and 270 mW with a a-cut Tm:YAP and a b-cut Tm,Ho:YAP crystal in continuous wave (CW) mode operation were obtained at 1.965-2.020 and 2.12 µm in 1998 [30]. A 15 W output power of b-cut Tm,Ho:YAP crystal in CW mode operation was acquired at 2.12 µm in 2013 [31]. Compared with the output wavelength of Tm:YAP laser, the output wavelength of Tm,Ho:YAP was longer at 2 µm wavelength range [30,31].…”

“…A 15 W output power of b-cut Tm,Ho:YAP crystal in CW mode operation was acquired at 2.12 µm in 2013 [31]. Compared with the output wavelength of Tm:YAP laser, the output wavelength of Tm,Ho:YAP was longer at 2 µm wavelength range [30,31].…”

Efficient Ho:YVO4 Laser Double-Pass-Pumped by a Wavelength-Stabilized Laser Diode

“…However, Tm, Ho co-doped lasers with quasi-three-level rely on energy-transfer processes and exhibit losses in radiation and irradiation, which lead to large heat loading of the gain-mediums in room-temperature operation [1]. In order to yield more powerful and brighter lasers, liquid nitrogen temperature is always needed [2]. In contrast, singly Ho-doped lasers by directresonant-pumping [3][4][5][6][7][8][9][10] to obtain 2 µm lasers have the advantage of high conversion efficiency and less thermal loading because of the weaker quantum defect between the laser and pump; thus, operation at room temperature is possible.…”

Diode-pumped passivelyQ-switched dual-wavelengthc-cut Tm,Ho:LLF laser at 2 μm

“…In past years, many Tm-Ho codoped laser crystals have been widely used to generate 2 µm lasers, such as Y 3 Al 5 O 12 (YAG), YAlO 3 (YAP), GdVO 4 , YVO 4 , YLiF 4 (YLF), and LuLiF 4 (LLF). [2][3][4][5]. Among these known Tm-Ho codoped materials, Tm,Ho:LLF is an excellent laser crystal due to the good thermo-optical and thermo-mechanical properties, high natural birefringence, low upconversion effect, and large energy spread of the manifolds [5,6].…”