Previously reported progress in 3 micron dysprosium doped ZBLAN fiber lasers achieved record conversion efficiency but was limited in tuneability due to the inband nature of the pumping scheme. Near infrared pumping has also been demonstrated but was limited in conversion efficiency due both to pump excited state absorption and large quantum defect. We address these limitations by employing a Raman fiber laser operating at 1700 nm as a pump source. Reduced quantum defect shows promise for efficiency gains while maintaining near infrared pumping and the increased gain bandwidth shows promise for pulsed operation.
Matthew R. Majewski, Robert I. Woodward, and Stuart D. Jackson, "Near infrared pumped full gain bandwidth tunable 3 micron dysprosium fiber laser," Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105120U (Presented at SPIE LASE: January 30, 2018; Published: 26 February 2018); https://doi.org/10.1117/12.2289382.
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