Journal
IEEE JOURNAL OF QUANTUM ELECTRONICS
Volume 42, Issue 1-2, Pages 187-191Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JQE.2005.861824
Keywords
fiber lasers; high efficiency; high power; holmium; midinfrared; Raman fiber lasers
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The use of the high-power Tm3+-doped silica fiber laser as a pump source for Ho3+-doped silica and Ho3+-doped fluoride fiber lasers for the generation of 2.1-mu m radiation is demonstrated. The Ho3+-doped silica fiber laser produced a maximum output power of 1.5 W at a slope efficiency of similar to 82%; one of the highest slope efficiencies measured for a fiber laser. In a nonoptimized but similar fiber laser arrangement, a Ho3+-doped fluoride fiber laser produced an output power of 0.38 W at 2.08 mu m at a slope efficiency of similar to 50%. A Raman fiber laser operating at 1160 nm was also used to pump a Ho3+-doped fluoride fiber laser operating at a wavelength of 2.86 mu m. An output power of 0.31 W was produced at a slope efficiency of 10%. The energy transfer up-conversion process that depopulates the lower laser level in this case operates at a higher efficiency when the pump wavelength is closer to the absorption peak of the I-5(6) energy level, however, this energy transfer process does not impede to a great extent the performance of the Ho3+-doped fluoride fiber laser based on the similar to 2.1-mu m laser transition.
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