We report on a very highly doped and very highly efficient cladding pumped single mode Tm3+ silica fiber laser operating at 1.985 microns. The preform was fabricated using a proprietary all halide vapor phase modification of the MCVD process. The preform core has a maximum Tm2O3 doping concentration of greater than 8.5 wt%. A laser based on the resulting double clad fiber was pumped at 793 nm and demonstrated a record slope efficiency of 74.5 % wrt absorbed pump power.
Richard Tumminelli, Vincent Petit, Adrian Carter, Alexander Hemming, Nikita Simakov, and John Haub, "Highly doped and highly efficient Tm doped fiber laser (Conference Presentation)," Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120M (Presented at SPIE LASE: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2295936.5751417290001.
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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