Abstract
The expansion of laser sources operating near 3 μm is motivated in large by their strong absorption in several gases, liquid water, and plastics, critical for applications in remote sensing, soft and hard tissue surgery, and materials processing [1,2]. Both CW and pulsed operations were demonstrated in Cr2+:CdSe lasers with wide tunability range spanning from 2 μm to 3.6 μm. Different pump sources were used, such as Tm3+- and Tm3+,Ho3+-doped crystal lasers, diodes and Tm-fiber lasers [3,4]. The relatively short lifetime of the upper laser level and low damage threshold of Cr2+:CdSe crystal surface limit maximum pulse energy and average power in the repetitively-pulsed Cr2+:CdSe oscillators [2–4]. The highest average power achieved so far in the Cr2+:CdSe lasers was less than 1 W at kHz pulse repetition rate (PRR). In this report, we present an efficient high-repetition-rate Cr2+:CdSe single-crystal laser operating around 3 μm with the output power of up to 6 W and pumped at 2.1 μm by a fiber-laser-pumped Ho3+:YAG laser.
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