Nonlinear Propagation of Cylindrical Vector Beams in Photonic Crystal Fibers

Photonic Crystal Fibers (PCFs) have witnessed remarkable progress, and recent advancements in nonlinear optics allow us to manipulate the optical response of materials beyond linear regimes. Merging structured fibers with structured light enables precise control over the spatial, spectral, and temporal characteristics of light. This paper comprehensively investigates nonlinear propagation of femtosecond vector beam pulses through a PCF. We explore the impact of nonlinear effects on the modal properties of the donut-shaped beam within the PCF.

Fiber optics has revolutionized telecommunication technologies, and PCFs have emerged as a versatile platform, offering unprecedented control over light propagation [1]. In this context, the exploration of cylindrical vector beams (CVBs) has been a focal point of research, providing new avenues for designing efficient optical systems [2], [3]. This article delves into the unique characteristics of donut-shaped beams when passed through PCFs, aiming to unravel the underlying nonlinear effects that have not been explored before. We systematically investigate the influence of incident power on the transmission efficiency, spectrum, and modal characteristics of the output vector beam.