Dual-comb 2-µm MIXSELs

Marco Gaulke; Nicolas Huwyler; Maximilian C. Schuchter; Matthias Golling; Benjamin Willenberg; Ursula Keller

doi:10.1117/12.3001874

13 March 2024 Dual-comb 2-μm MIXSELs

Marco Gaulke, Nicolas Huwyler, Maximilian C. Schuchter, Matthias Golling, Benjamin Willenberg, Ursula Keller

Proceedings Volume PC12868, Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII; PC1286808 (2024) https://doi.org/10.1117/12.3001874
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Passively modelocked, optically pumped semiconductor disk lasers, commonly referred to as VECSELs or MIXSELs, offer a unique combination of wavelength versatility, wafer scalability, high beam quality, and substantial average output power. While V-shaped cavities are typically used for SESAM-modelocked VECSELs, MIXSELs utilize a simplified straight cavity, integrating the saturable absorber into the VECSEL chip. Here, we demonstrate a dual-comb modelocked MIXSEL in the Short-Wave Infrared (SWIR) regime, employing InGaSb quantum well gain and saturable absorber layers. The free-running dual-comb MIXSEL generates distinct microwave comb lines based on a few interferograms, eliminating the need for stabilization. Two distinct repetition rates enable sampling without aliasing while maintaining rapid acquisition times. Moreover, the phase of the heterodyne beat interferograms can be tracked, allowing for the application of coherent averaging algorithms. This breakthrough lays the foundation for dual-comb spectroscopy in the 2-μm regime providing direct access to CO2 spectroscopy.

Conference Presentation

Citation Download Citation

Marco Gaulke, Nicolas Huwyler, Maximilian C. Schuchter, Matthias Golling, Benjamin Willenberg, and Ursula Keller "Dual-comb 2-μm MIXSELs", Proc. SPIE PC12868, Vertical External Cavity Surface Emitting Lasers (VECSELs) XIII, PC1286808 (13 March 2024); https://doi.org/10.1117/12.3001874

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