Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 59: Lasers II

Q 59.5: Talk

Friday, March 15, 2024, 12:00–12:15, HS 1015

Nonliner Dynamics in Optical fibers for Sensing — •Glitta Rosalia Cheeran, Bennet Fischer, and Mario Chemnitz — Leibniz Institute of Photonic Technology

The study of nonlinear dynamics in optical fibers has attracted significant attention due to their applications in multi-frequency laser engineering and nonlinear imaging. In particular, supercontinuum generation, a complex nonlinear process that leads to the generation of new frequencies over hundreds of terahertz, has emerged as a versatile ultra-broadband source of light. This complex process depends on various factors, including the properties of the input pulse and the optical fiber involved. Our objective is to exploit the phase and amplitude sensitivity of supercontinuum generation for sensing by examining alterations of the spectral features of the output spectrum when an ultrashort pulse travels through a highly nonlinear fiber. The aim is to comprehend this nonlinear behavior through numerical methods and utilize these dynamics to create highly sensitive devices that can measure both the amplitude and phase of a sample object with high accuracy. In the presentation, we will introduce the uncommon concept of utilizing supercontinuum generation as a sensor instead of a source. We demonstrate a model sensing system, featuring an artificial spectral resonance as a narrowband frequency window, called "bit", within the spectral bandwidth of a 100 fs input pulse defined around 1550 nm. The sensitivity of supercontinuum spectra is then measured using different statistical methods. The next step is to utilize the simulation to examine realistic gas or liquid resonances.

Keywords: Nonlinear Fiber; Smart Sensor; Multicomponent Spectroscopy; Supercontinuum generation