Abstract
We report a new radiation-balanced laser design of a cladding-pumped double-clad fiber laser based on Yb-doped silica. The single-mode glass core has a high Yb doping level for lasing, whereas the inner cladding is cooling- grade silica glass with a low Yb concentration. Multimode pumping propagates along the inner cladding, scaling up the signal and extracting heat generated inside the core due to quantum defects and concentration quenching. Both analytical and numerical methods are used to calculate the electric-field and temperature distribution in the fiber. The core temperature is reduced significantly due to anti-Stokes cooling of the inner cladding.
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