Monolithic 976 nm laser design based on a newly developed saddle-shaped Yb-doped fiber has been proposed. The fiber has central single-mode part with core diameter of about 12 μm and ultra-thin square-shaped clad with side of about 42x42 μm. At the both ends of the saddle-shaped fiber the core and the clad sizes were adiabatically increased up to 20/(70x70) μm and the fiber could be spliced with standard (80..125 μm clad) passive fibers using commercially available equipment. Single-mode laser at 976 nm based on the developed fiber has been fabricated and photodarkening-free operation with output power of 10.6 W, which is the record high for all-fiber laser schemes, has been demonstrated.
Svetlana S. Aleshkina, Denis S. Lipatov, Andrei E. Levchenko, Oleg I. Medvedkov, Konstantin K. Bobkov, Mikhail M. Bubnov, Alexei N. Guryanov, and Mikhail E. Likhachev, "Monolithic diffraction-limited 976-nm laser based on saddle-shaped photo darkening-free Yb-doped fiber," Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121R (Presented at SPIE LASE: February 01, 2018; Published: 26 February 2018); https://doi.org/10.1117/12.2289918.
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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