Deep-red laser operation of cleaved single-crystal plates of Eu:CsGd(MoO4)2 molybdate

We report on the first deep-red laser operation of a heavily Eu 3+ -doped cesium gadolinium double molybdate crystal with a perfect cleavage. A 17 at. % Eu:CsGd(MoO 4 ) 2 laser based on cleaved single-crystal plates generated a maximum continuous-wave output power of 212 mW at 703.1 nm ( 5 D 0 → 7 F 4 transition) with a slope efficiency of 30.1%, a low laser threshold of 51 mW, linear polarization, and a beam quality factor M 2 = 1.6–1.7. This monoclinic crystal is promising for deep-red microchip lasers.