From Event: SPIE LASE, 2019
Current developments in LIDAR and atmospheric sensing experiments highlight the need for multi-watt, large bandwidth, high dynamic range polarization-maintaining optical amplifiers in the eye safe 1.9—2.15 μm band. So far, as an illustration of the previous state of the art for high power devices, multi-watt Tm-doped fiber amplifiers (TDFAs) have been demonstrated by Goodno et al. with an output power of 608 W at a signal wavelength of 2040 nm. As for Ho-doped fiber amplifiers (HDFAs) Hemming et al. have reported output powers of 265 W at 2110 nm. For this HDFA, a double clad Ho-doped fiber pumped by high power fiber lasers made the configuration complex and yielded an optical slope efficiency of 41%. Both of these achievements were with standard (non-polarization-maintaining) fiber.
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Robert E. Tench, Clément Romano, and Jean-Marc Delavaux, "25W, 2um broadband polarization-maintaining hybrid Ho- and Tm-doped fiber amplifier," Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 108970K (Presented at SPIE LASE: February 05, 2019; Published: 7 March 2019); https://doi.org/10.1117/12.2505436.
