Highly efficient frequency doubling and quadrupling of a short-pulsed thulium fiber laser

Abstract

We report the second harmonic generation and fourth harmonic generation of the output from a short-pulsed (~ 80 ps) thulium-doped fiber laser, generating 976 and 488 nm wavelengths with high efficiency. With a narrow-linewidth (0.5 nm) pump at a power of 3.2 W, a second harmonic power of 2.4 W was generated at 976 nm with a conversion efficiency reaching 75%. For FHG, 690 mW of power at 488 nm was obtained from frequency doubling of 976 nm with a conversion efficiency of 30%.

Thermal Stability of ZnO/Tm₂O₃ Substitution on Tellurite-Zinc-Bismuth-Sodium (TZBN) Glasses

“…Glasses doped with rare earth elements have gained significant attention in recent years, owing to their unique optical and electronic properties, and their potential applications in diverse fields such as photonics, optoelectronics, and sensors [1,2,3,4,5]. Thulium (Tm), a rare earth element, has emerged as a promising dopant for glasses, thanks to its characteristic luminescence properties, which make it suitable for a variety of laser and amplifier applications [6,7]. Among known glass former role, tellurite-based glasses have emerged as a promising glass system for rare earth doping, due to their high refractive index, low phonon energy, and excellent thermal and mechanical properties [8,9,10,11].…”

16.9 MW, efficient 486.1 nm blue optical parametric oscillator using single BBO crystal

“…In 2015, Leeuwen et al developed a Q-switched sidepumped frequency-doubling Nd:YAG laser emitting at 473 nm wavelength with 4.7 mJ pulse energy output, its repetition rate was 170 Hz, and the peak power was around 174 kW [6]. In 2018, Xu et al realized the fourth harmonic generation from a thulium-doped fiber laser, achieving a short-pulsed blue laser at 488 nm with 690 mW power output [7]. In 2019, Lu et al developed a Q-switched frequency-doubling Nd:YAG laser, and 473 nm blue laser output at 100 Hz repetition rate with 2 mJ pulse energy was obtained, corresponding to 0.2 MW peak power [8].…”