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 Eu³⁺-doped cesium gadolinium double molybdate crystal with a perfect cleavage. A 17 at. % Eu:CsGd(MoO₄)₂ laser based on cleaved single-crystal plates generated a maximum continuous-wave output power of 212 mW at 703.1 nm (⁵D₀ → ⁷F₄ transition) with a slope efficiency of 30.1%, a low laser threshold of 51 mW, linear polarization, and a beam quality factor M² = 1.6-1.7. This monoclinic crystal is promising for deep-red microchip lasers.