Noise characterization of mid-infrared supercontinuum generated through gain-switched pumping

Callum Robertson Smith; Christian Rosenberg Petersen; Ole Bang

doi:10.1117/12.3000306

13 March 2024 Noise characterization of mid-infrared supercontinuum generated through gain-switched pumping

Callum Robertson Smith, Christian Rosenberg Petersen, Ole Bang

Proceedings Volume PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII; PC128690K (2024) https://doi.org/10.1117/12.3000306
Event: SPIE LASE, 2024, San Francisco, California, United States

Abstract

Optical coherence tomography systems would greatly benefit from stable mid-infrared supercontinuum sources, which can allow deeper sample penetration compared to near-infrared sources, making them highly desirable for nondestructive testing applications. Here we firstly present the development of a flexible and fully-fiberized pump consisting of a gain-switched 1950 nm semiconductor laser amplified to an average power of 1.3 W, at 1 MHz repetition rate with 11 ps pulse duration. We utilize this pump to initiate nonlinear soliton dynamics in ZBLAN fiber, subsequently generating a broad supercontinuum extending beyond 4 μm. Spectrally-resolved pulse-to-pulse energy variations are recorded for various pumping configurations in order to quantify and optimize spectral broadening and stability, which are essential factors to maximizing speed and signal-to-noise ratio in the intended application.

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Callum Robertson Smith, Christian Rosenberg Petersen, and Ole Bang "Noise characterization of mid-infrared supercontinuum generated through gain-switched pumping", Proc. SPIE PC12869, Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII, PC128690K (13 March 2024); https://doi.org/10.1117/12.3000306

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KEYWORDS

Mid-IR

Supercontinuum generation

Relative intensity noise

Light sources

Optical coherence

Optical coherence tomography

Picosecond phenomena

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