Ultrafast 1-GHz repetition rate dual-comb optical parametric oscillator
Year: 2025
Type: article
Abstract: We report the first demonstration of dual-comb operation from a femtosecond optical parametric oscillator (OPO) at a 1-GHz pulse repetition rate. The singly-resonant OPO is fundamentally synchronously pumped by a high-power low-noise Yb:CaF2 diode-pumped solid-state laser, enabling a compact system design, high parametric gain, and stable uniform pulse trains for both the signal and idler outputs. Dual-comb generation is realized in a spatially multiplexed single-cavity configuration for both the OPO and the pump laser. The center wavelength is tunable from 1415 nm to 1645 nm (signal) and 2960 nm to 4085 nm (idler) with average powers up to 650 mW and 200 mW per comb, respectively. The source delivers on average an instantaneous bandwidth of 2.5 THz, a power-per-combline up to 270 μW in the short-wave infrared and 75 μW in the mid-wave infrared is available. We demonstrate the potential of this source for fast dual-comb spectroscopy by detecting ambient methane (∼ 2 ppm) at 1645.5 nm over a 41-m path length, achieving a normalized spectral signal-to-noise ratio of 42.0 dB Hz1/2. This measurement was performed without any active stabilization.
Source: Optics Express
DOI: 10.1364/oe.572647
Authors: Carolin P. Bauer, Lukas Lang, Benjamin Willenberg, José M. Pereira, Justinas Pupeikis, Ursula Keller
Institution: Technical University of Denmark
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
Funders: National Science Foundation, European Commission, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Eidgenössische Technische Hochschule Zürich, Otto Mønsteds Fond, Innosuisse - Schweizerische Agentur für Innovationsförderung, HORIZON EUROPE European Research Council
OpenAlex ID: W4413290898