2025/06/17 by Deok Woo Kim, Seong-Eun Lim, Xavier Mateos +4 · 1 voice
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Laser-Matter Interactions and Applications #Solid State Laser Technologies
paper · doi:10.1364/ol.566491
openalex publication_date 2025/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
We report on the development of a continuous-wave mode-locked Yb:LuGG waveguide laser fabricated via femtosecond laser inscription. The laser operates near 1036 nm with tunable repetition rates of 192 MHz and 532 MHz, utilizing a single-walled carbon nanotube saturable absorber mirror for mode-locking. By precisely adjusting a piezo-driven air gap between the output coupler and the waveguide facet, and fine-tuning the laser mode area on the absorber using an intracavity lens pair, we achieved stable mode-locked operation at both repetition rates without Q-switching instabilities. The optimized laser delivers maximum average output powers of 113 mW with a pulse duration of 1.18 ps at 192 MHz, and 115 mW with a pulse duration of 968 fs at 532 MHz, demonstrating robust and efficient ultrafast pulse generation in a compact configuration.