Abstract
Efficient and power-scalable laser operation of a vibronic microchip laser at is demonstrated. In the continuous-wave mode under diode pumping at , this laser generated 1.17 W at 2109–2133 nm with a slope efficiency of 39%. This emission is related to the coupling of the electronic transitions of ions with the stretching vibrations of the WOW oxygen bonds in the monoclinic crystal host appearing at , 406, and . The achieved emission wavelength is longer, to our knowledge, than any previously reported laser based on or doped double tungstate crystals. Passive -switching of the vibronic laser is realized with a single-walled carbon nanotube (SWCNT) based saturable absorber, representing the longest wavelength in this mode of operation. In this regime, the maximum output power reached 0.70 W at 2131 nm, corresponding to a slope efficiency of 29%. The pulse characteristics were 25 ns/1.1 μJ at the pulse repetition frequency of 0.62 MHz. These are, we believe, the shortest pulses ever achieved in any lanthanide-based laser passively -switched by carbon nanostructures. A conventional (purely electronic transition) microchip laser at 1.92 μm -switched by the same SWCNTs generated 40 ns/4.0 μJ pulses corresponding to a peak power of 0.1 kW, which is a record value for this type of laser oscillator, to our knowledge.
© 2016 Optical Society of America
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