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We demonstrated a narrow‐linewidth Ho:yttrium aluminum garnet (YAG) injection‐locked laser by using a 1908 nm thulium‐doped fiber laser as a pumping source to generate 2.09 μm single‐frequency pulses. A compact single‐longitudinal‐mode nonplanar ring oscillator (NPRO) based on Ho:YAG material with a beam quality factor of 1.01 at the central wavelength of 2090.91 nm was considered as the seed source...
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