60.4 W continuous-wave single-frequency laser output from a two-stage Nd:YAG single-crystal fiber amplifier

A Nd:YAG single-crystal fiber amplifier for the amplification of continuous-wave single-frequency laser end-pumped by a laser diode (LD) is investigated. With a two-stage amplification configuration, an output power of 60.4 W under the total incident pump power of 200 W is achieved, which is. to our knowledge, the highest power from a continuous-wave single-frequency laser achieved with a single-crystal fiber scheme. The extraction efficiency reaches 41.650 in the second amplification stage, which is comparable with Innoslab amplifiers. The beam quality factors M-2 at the maximum output power in the horizontal and vertical direction are measured to be 1.51 and 1.38, respectively. The long-term power instability for 1 hour is 0.9750. (C) 2022 Optica Publishing Group

Automated summary

A Nd:YAG single-crystal fiber amplifier, pumped by a laser diode, was investigated for the amplification of continuous-wave single-frequency laser. By using a two-stage amplification configuration, an output power of 60.4 W was achieved, which is the highest power ever achieved with a single-crystal fiber scheme for continuous-wave single-frequency laser.