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13 March 2024 Carrier envelope frequency correlation properties of a polarization multiplexed free running single-cavity dual-comb laser
Christopher R. Phillips, Alexander Nussbaum-Lapping, José Gómez Torres, Ursula Keller, Lukas Lang
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Proceedings Volume PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; PC1286902 (2024) https://doi.org/10.1117/12.3002474
Event: SPIE LASE, 2024, San Francisco, California, United States
Abstract
Here we study the noise correlations of a birefringent crystal based single-cavity dual-comb laser operating at 160 MHz repetition rate. We characterize the temporal fluctuations of one RF comb line, the repetition-rate difference Δf_rep, the f_CEO of the individual combs, and their difference Δf_CEO. This is achieved by coupling both combs into a single f-2f interferometer and simultaneously measuring heterodyne beat-notes with cw lasers. We find that the dual-comb Δf_CEO fluctuations are 20-dB lower than those of f_CEO, indicating highly correlated combs. Furthermore, we show that Δf_CEO and Δf_rep fluctuations are almost fully anti-correlated, enabling narrow linewidth in free-running operation.
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Christopher R. Phillips, Alexander Nussbaum-Lapping, José Gómez Torres, Ursula Keller, and Lukas Lang "Carrier envelope frequency correlation properties of a polarization multiplexed free running single-cavity dual-comb laser", Proc. SPIE PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, PC1286902 (13 March 2024); https://doi.org/10.1117/12.3002474
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KEYWORDS
Laser frequency
Multiplexing
Polarization
Interferometers
Oscilloscopes
Laser crystals
Laser interferometry
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