High-efficiency continuous-wave Tm-doped fiber laser with a single fiber Bragg grating at 1942 nm

Abstract

We report a continuous-wave Tm-doped fiber (TDF) laser with a single fiber Bragg grating (FBG). The Fresnel effect presenting in the passive fiber end-face and high-reflectivity FBG established the resonator. The peak wavelength of the laser was 1942.25 nm with a spectral linewidth of 194 pm. The maximum output power was 37.5 W, corresponding to a slope efficiency of 63.7% with a beam quality factor of M 2 ∼ 1.51. To the best of our knowledge, this is the highest slope efficiency of a TDF laser pumped by 793 nm laser diode.

High efficiency continuous-wave Ho: LSO laser wing-pumped by the laser diode at 1.91 μm

“…2 μm solid-state lasers utilize Tm 3+ /Ho 3+ -doped matrix materials as the laser gain medium, harnessing energy transitions from these rare earth elements to directly produce 2 μm laser output [7][8][9][10][11]. The choice of matrix material significantly influences the thermal and mechanical properties of the laser gain medium.…”