Repetition-rate-tunable femtosecond mode-locked Yb:GYSO laser in the sub-GHz regime
Year: 2025
Type: article
Abstract: We report the successful implementation of a repetition-rate-tunable femtosecond mode-locked laser utilizing a Yb:GYSO crystal in the sub-GHz regime with tunability from 0.517 GHz to 0.881 GHz. Mode-locking was achieved using a semiconductor saturable absorber mirror (SESAM), and the total intracavity dispersion was set to negative values by incorporating a chirped concave mirror providing -1200 fs 2 group delay dispersion at 1045 nm, enabling stable operation in the soliton mode-locked regime. Detailed characterization at four distinct repetition-rate configurations showed that all mode-locked states maintained long-term stability for several hours without signs of instability. Input-output performances confirmed efficient laser operation with maximum output powers exceeding 400 mW and slope efficiencies above 25% across all configurations. In all cases, pulse durations remained below 200 fs near 1050 nm. These results clearly demonstrate that Yb:GYSO is a highly promising gain medium for efficient ultrafast laser operation in compact cavities requiring high-repetition-rate (GHz-level) operation.
Source: Optics Express
DOI: 10.1364/oe.576702
Authors: Deok Woo Kim, Ji-Hoon Park, Seong-Eun Lim, Fabian Rotermund
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Awards: G2164685821, G4761871444, G6725148086
OpenAlex ID: W4414514848