We compare the laser performance of a low Tm3+-doped silica fiber laser as pumped at 800 nm to one as pumped at 1620 nm. Using 800 nm non-resonant (3H6→3H4) pumping, 5.5 W of 1940 nm at 32% optical slope efficiency was demonstrated while 1620 nm resonant pumping (3H6→3F4) yielded 13 W with 55% slope efficiency from the same Tm-doped fiber. We also include experimental results our first demonstration of 1620 nm resonant pumping of a Tm-doped fiber with 15.5 W and 67% slope efficiency using an optimized fiber coupled source.
G. A. Newburgh, J. Zhang, and M. Dubinskii, "Comparison of Tm-doped fiber laser performance as diode pumped at 800 nm and 1620 nm," Proc. SPIE 10528, Optical Components and Materials XV, 1052808 (Presented at SPIE OPTO: January 29, 2018; Published: 22 February 2018); https://doi.org/10.1117/12.2296589.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon