Characterization of self-phase modulation in liquid filled hollow core photonic band gap fibers

TL;DR

This paper investigates self-phase modulation in a liquid-filled hollow core photonic crystal fiber, providing detailed experimental and theoretical analysis of its nonlinear optical properties, including precise measurement of the nonlinear index change of deuterated acetone.

Contribution

It offers a comprehensive characterization of SPM in liquid-filled fibers and introduces a new analytical model for spectra of secant hyperbolic pulses in Kerr media.

Findings

Nonlinear index change of acetone-d6 measured as (1.15±0.17)×10⁻¹⁹ m²/W.

Complete linear optical property characterization of the fiber.

Validation of the analytical expression for SPM spectra.

Abstract

We experimentally and theoretically study self-phase modulation by Kerr effect in a liquid filled hollow core photonic crystal fiber. We perform a complete characterization of the linear optical properties of the hollow core photonic band gap fiber filled with deuterated acetone to determine all the characteristics of the propagation mode. The nonlinear coefficient of the fiber is determined by fitting the output spectra broadened by self-phase modulation with a new analytical expression giving the spectra of a secant hyperbolic pulse transmitted through a Kerr media. The experiment allows a precise determination of the nonlinear index change of acetone-d6 equal to (1.15$\pm$0.17)x10-19 m2W-1.