Abstract
Depressed-index channel waveguides with a circular and photonic crystal cladding structures are prepared in a bulk monoclinic crystal by 3D direct femtosecond laser writing. The channel waveguide structures are characterized and laser operation is achieved using external mirrors. In the continuous-wave mode, the maximum output power of 46 mW is achieved at 1912 nm corresponding to a slope efficiency of 15.2% and a laser threshold of only 21 mW. Passive -switching of a waveguide with a circular cladding is realized using single-walled carbon nanotubes. Stable 7 nJ/50 ns pulses are achieved at a repetition rate of 1.48 MHz. This first demonstration of fs-laser-written waveguide lasers based on monoclinic double tungstates is promising for further lasers of this type doped with and .
© 2017 Optical Society of America
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