Efficient Ho:YAP laser dual end-pumped by a laser diode at 1.91 µm in a wing-pumping scheme
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We demonstrated a first continuous-wave and acousto-optical Q-switched Ho:YAP laser pumped by fiber-coupled laser diode at 1.91 µm. With a dual-end wing-pumping scheme, a maximum continuous-wave output power of 10.5 W at 2.1 µm and a slope efficiency of 53.2% were obtained when the incident LD power was 25.6 W, while diode-to-Ho conversion efficiency reached up to 41.0%. The Q-switched Ho:YAP laser was investigated for different pulse repetition frequencies from 3 to 20 kHz. The maximum average output power of 9.8 W and maximum pulse energy of 2.7 mJ were achieved at pulse repetition frequencies of 20 and 3 kHz, respectively. In addition, we demonstrated an efficient mid-infrared laser based on a diode-Ho-ZGP architecture for the first time. With a pulse repetition frequency of 3 kHz and an incident Ho pump power of 8.2 W, the average output power of 4.8 W and slope efficiency of 61.0% were reached in mid-infrared ZGP-OPO.
This work is supported by National Natural Science Foundation of China (51572053, 61378029 and 61775053), Science Foundation for Outstanding Youths of Heilongjiang Province (JC2016016), Science Foundation for Youths of Heilongjiang Province (QC2017078), and Fundamental Research funds for the Provincial Universities (Grant no. WL17B14).
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