High-power diode-pumped Q-switched Er3+:YAG single-crystal fiber laser for active imaging system

TL;DR

This paper reports the development of a high-power, efficient Er:YAG single-crystal fiber laser capable of Q-switched operation at 1645 nm, with record output powers and pulse energies, advancing active imaging technology.

Contribution

It introduces the first Q-switched Er:YAG single-crystal fiber laser and demonstrates record high output powers at multiple wavelengths using diode pumping.

Findings

12.5 W emission at 1645 nm with 32% efficiency

First Q-switched Er:YAG fiber laser with 38 ns pulses

Highest power at 1617 nm for diode-pumped Er:YAG lasers

Abstract

We describe an efficient laser emission from a directly grown Er3+:YAG single-crystal fiber that is resonantly pumped using a continuous-wave (CW) laser diode at 1532 nm. In a longitudinal pumping, it emits 12.5 W at 1645 nm with a slope efficiency of 32%, which is the highest ever reported for a directly grown Er:YAG single-crystal fiber laser. Using an off-axis pumping scheme, CW output powers up to 7.3 W can be reached and in Q-switched operation, the laser produces 2 mJ pulses with a duration of 38 ns at the repetition rate of 1 kHz with an M^{2} factor below 1.8. To our knowledge this is the first directly grown Er3+:YAG single-crystal fiber Q-switched laser. In dual-side pumping scheme a laser emission at 1617 nm is achieved with output powers up to 5.7 W representing the highest output power ever achieved by a diode-pumped Er:YAG laser at this wavelength.