Abstract
We report on the properties of tapered single-ring hollow-core photonic-crystal fibers, with a particular emphasis on applications in nonlinear optics. The simplicity of these structures allows the use of non-invasive side-illumination to assess the quality of the tapering process, by observing the scattered far-field spectrum originating from excitation of whispering-gallery modes in the cladding capillaries. We investigate the conditions that ensure adiabatic propagation in the up- and down-tapers, and the scaling of loss-bands (created by anti-crossings between the core mode and modes in the capillary walls) with taper ratio. We also present an analytical model for the pressure profile along a tapered hollow fiber under differential pumping.
Highlights
Over the last few decades, tapered step-index and photonic crystal fibers, offering axially varying dispersion and high effective nonlinearity, have emerged as attractive platforms for controlling nonlinear optical effects such as supercontinuum generation,1,2 dispersive wave generation,3,4 adiabatic pulse compression5 and third harmonic generation.6,7 More recently, rapid developments in hollow-core photonic crystal fibers that guide by anti-resonantreflection (ARR-PCFs) have opened up new possibilities for gasbased nonlinear optics, offering very high optical damage thresholds, wide spectral transmission bands and pressure-tunable dispersion when gas-filled.11 Here we report on a series of experiments exploring the use of tapered ARR–PCF in gas-based nonlinear optics
We report on the properties of tapered single-ring hollow-core photonic-crystal fibers, with a particular emphasis on applications in nonlinear optics
We present an analytical model for the pressure profile along a tapered hollow fiber under differential pumping
Summary
Over the last few decades, tapered step-index and photonic crystal fibers, offering axially varying dispersion and high effective nonlinearity, have emerged as attractive platforms for controlling nonlinear optical effects such as supercontinuum generation, dispersive wave generation, adiabatic pulse compression and third harmonic generation. More recently, rapid developments in hollow-core photonic crystal fibers that guide by anti-resonantreflection (ARR-PCFs) have opened up new possibilities for gasbased nonlinear optics, offering very high optical damage thresholds, wide spectral transmission bands (especially in the UV8,9 and in the mid-IR10) and pressure-tunable dispersion when gas-filled. Here we report on a series of experiments exploring the use of tapered ARR–PCF in gas-based nonlinear optics. Over the last few decades, tapered step-index and photonic crystal fibers, offering axially varying dispersion and high effective nonlinearity, have emerged as attractive platforms for controlling nonlinear optical effects such as supercontinuum generation, dispersive wave generation, adiabatic pulse compression and third harmonic generation.. Rapid developments in hollow-core photonic crystal fibers that guide by anti-resonantreflection (ARR-PCFs) have opened up new possibilities for gasbased nonlinear optics, offering very high optical damage thresholds, wide spectral transmission bands (especially in the UV8,9 and in the mid-IR10) and pressure-tunable dispersion when gas-filled.. We report on the fabrication and characterization of tapered SR-PCF, and present a systematic analysis of the optical properties relevant to experiments in the field of nonlinear optics. We show that the taper profile can be designed so that the zero dispersion wavelength (ZDW) remains constant along the whole fiber length, while the third order dispersion and the effective nonlinearity vary
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