Power scaling analysis of crystalline fiber waveguides based on RE3+-doped YAG cores

Da Li; Pengda Hong; Stephanie K. Meissner; Helmuth E. Meissner

doi:10.1117/12.2213474

30 March 2016 Power scaling estimate of crystalline fiber waveguides with rare earth doped YAG cores

Da Li, Pengda Hong, Stephanie K. Meissner, Helmuth E. Meissner

Proceedings Volume 9744, Optical Components and Materials XIII; 97441I (2016) https://doi.org/10.1117/12.2213474
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

Power scaling analysis based on the model by Dawson et al. [1,2] for circular core fibers has been applied to estimating power scaling of crystalline fiber waveguides (CFWs) with RE³⁺ doped single crystalline or ceramic YAG (RE=rare earth: Yb, Er, Tm and Ho). Power scaling limits include stimulated Brillouin scattering, thermal lensing effect, and limits to coupling of pump light into CFWs. The CFW designs we have considered consist, in general, of a square doped RE³⁺:YAG core, an inner cladding of either undoped or laser-inactive-ion-doped YAG and an outer cladding of sapphire. The presented data have been developed for the structures fabricated using the Adhesive-Free Bonding (AFB®) technique, but the results should be essentially independent of fabrication technique, assuming perfect core/inner cladding/outer cladding interfaces. Hard power scaling limits exist for a specific CFW design and are strongly based on the physical constants of the material and its spectroscopic specifics. For example, power scaling limit was determined as ~16 kW for 2.5% ceramic Yb:YAG/YAG (core material/inner cladding material) at fiber length of 1.7 m and core diameter of 69 μm. Considering the present manufacturing limit for CFW length to be, e.g., 0.5 m, the actual maximum output power will be limited to ~4.4 kW for a Yb:YAG/YAG CFW. Power limit estimates have also been computed for Er³⁺, Tm³⁺ and Ho³⁺doped core based CFWs.

Citation Download Citation

Da Li, Pengda Hong, Stephanie K. Meissner, and Helmuth E. Meissner "Power scaling estimate of crystalline fiber waveguides with rare earth doped YAG cores", Proc. SPIE 9744, Optical Components and Materials XIII, 97441I (30 March 2016); https://doi.org/10.1117/12.2213474

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