Work

Octave-spanning frequency comb from a single-diode-pumped 1 GHz Ti:sapphire laser

Year: 2025

Type: article

Abstract: Broadband frequency combs with mode spacings of ≥ 1 GHz provide a valuable resource for optical frequency metrology and astrophotonics. Significant average powers are often needed to reach the pulse energies required for supercontinuum generation at 1 GHz repetition rates, putting this beyond the reach of most simple ultrafast lasers. Here, by using dispersion-engineered Si 3 N 4 waveguides, we report octave-spanning comb generation from 539 to 1078 nm (−20 dB bandwidth) pumped with a three-element 1 GHz Ti:sapphire laser powered by a single laser diode. Laser repetition-rate stability of 790 mHz is achieved over a 1-hour duration, and carrier-envelope-offset control and stabilization to a single-frequency cw laser is presented. The system offers a simple route to a coherent, broadband supercontinuum spanning the visible to the near-infrared, with potential as an enabling technology for optical frequency metrology, quantum-timekeeping and astrophysical spectrograph calibration.

Source: Optics Letters

DOI: 10.1364/ol.582185

Authors: Ewan Allan, Abdullah Alabbadi, Pablo Castro-Marín, Hanna Ostapenko, Pascal Del’Haye, Derryck T. Reid

Institutions: Friedrich-Alexander-Universität Erlangen-Nürnberg, Alexandria University

Language: English

Topic: Advanced Fiber Laser Technologies

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: hybrid