Accuracy of the capillary approximation for gas-filled kagomé-style photonic crystal fibers

Finger, Martin A.; Joly, Nicolas Y.; Weiß, Thomas; Russell, P. St. J.

doi:10.1364/ol.39.000821

Cited by 50 publications

(44 citation statements)

References 17 publications

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“…The areapreserving radius can be determined using the UV asymptotic level of the normalized effective index in Fig. 7 (it is responsible for shifting the mMS data below unity), and we note that we find a higher value (a AP = 1.075a c ) than in a kagome fiber (where a AP = a c 2 √ 3/π ≃ 1.05a c was found [28]). Concerning the requirement for an IR dispersion correction the perturbative case shows an good agreement in the IR with the FEM data for s = 0.02.…”

Section: E Total Lossmentioning

confidence: 49%

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Poor-man’s model of hollow-core anti-resonant fibers

et al. 2018

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We investigate various methods for extending the simple analytical capillary model to describe the dispersion and loss of anti-resonant hollow-core fibers without the need of detailed finite-element simulations across the desired wavelength range. This poor-man's model can with a single fitting parameter quite accurately mimic dispersion and loss resonances and anti-resonances from full finite-element simulations. Due to the analytical basis of the model it is easy to explore variations in core size and cladding wall thickness, and should therefore provide a valuable tool for numerical simulations of the ultrafast nonlinear dynamics of gas-filled hollow-core fibers.

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Section: E Total Lossmentioning

confidence: 49%

“…As mentioned above we use the mMS model [28] in order to obtain a correction in the IR and UV dispersion. The areapreserving radius can be determined using the UV asymptotic level of the normalized effective index in Fig.…”

Section: E Total Lossmentioning

confidence: 99%

Poor-man’s model of hollow-core anti-resonant fibers

et al. 2018

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“…We therefore numerically modeled the pulse propagation using a single-mode unidirectional field equation [20], including photoionization with the Perelomov, Popov, Terent'ev (PPT) ionization rates [21], modified with the Ammosov, Delone, Krainov (ADK) coefficients [22]. The dispersion of the fiber was modelled using a simple capillary model [6,23], modified by a wavelengthdependent effective core radius that allows an accurate estimate of the modal refractive index at longer wavelength [24]. The s-parameter in this modified capillary model was set to s = 0.08, an optimum value that was determined by finite-element modelling of an idealized fiber with the same structural parameters.…”

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confidence: 99%

PHz-Wide Spectral Interference Through Coherent Plasma-Induced Fission of Higher-Order Solitons

et al. 2017

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We identify a novel regime of soliton-plasma interactions in which high-intensity ultrashort pulses of intermediate soliton order undergo coherent plasma-induced fission. Experimental results obtained in gasfilled hollow-core photonic crystal fibers are supported by rigorous numerical simulations. The cumulative blueshift of higher-order input solitons with ionizing intensities results in pulse splitting before the ultimate self-compression point, leading to the generation of robust pulse pairs with PHz bandwidths. The novel dynamics closes the gap between plasma-induced adiabatic soliton compression and modulational instability.PACS numbers: 42.81. Dp, 42.65.Re, 32.80.Fb The interaction of ultrashort laser pulses with photoinduced plasmas has been the subject of intense research, and its understanding is of fundamental importance in many different fields, for example optical filamentation [1] and attosecond physics [2]. The field has been mostly studied in free space [3] and fiber capillaries [4]. In both these cases, however, spurious spatial effects complicate the dynamics and control over the propagation of the laser pulses is limited. Over the past few years, gas-filled hollow-core photonic crystal fiber [5] (PCF) has matured as an ideal platform for studying the interaction of laser light with matter. The tight confinement of high-intensity femtosecond pulses in a single spatial mode with precisely controllable anomalous dispersion allows established soliton dynamics to be extended into the strong-field regime [6], opening up unique possibilities. For the first time, it has been possible to study how optical solitons interact with plasmas over long pathlengths and broad frequency ranges in a well-controlled environment, as well as effects such as plasma-induced blue-shifting [7,8], adiabatic soliton compression [9] and modulational instability (MI) [10].In previous work, soliton-plasma interactions were mainly studied in the regimes of low and very high soliton order. Here we investigate high-intensity ultrashort solitons of intermediate order, and demonstrate novel coherent plasma-induced fission, leading to pulse splitting and the production of robust pulse pairs of PHz bandwidth that co-propagate phase-locked over cm-long distances. We furthermore show that the regimes of soliton-based pulse compression [11][12][13], supercontinuum generation [14,15], dispersive wave (DW) emission [16,17], soliton blue-shifting and plasma-induced fission can be accessed in a single system, simply by changing the input pulse energy. The findings are of great practical interest as hollow-core PCF-based pulse manipulation schemes evolve into a highly-demanded asset in modern high-repetition rate laser systems [18,19].In the experiment, an 8-cm-long kagomé-type PCF with 36 μm core diameter and 200 nm core wall thickness was placed in a gas-cell filled with 2 bar of Kr. It was pumped by 28-fs-long (full-width-half-maximum -FWHM) pulses at ~0.29 PHz (1.03 μm) with up to 13.2 μJ pulse energy at a repetition rate of 151 kHz....

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“…The LP 01 -modal dispersion of kagomé-PCFs is accurately approximated by that of a large-bore capillary [24,34]:…”

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confidence: 99%

Photoionization-Induced Emission of Tunable Few-Cycle Midinfrared Dispersive Waves in Gas-Filled Hollow-Core Photonic Crystal Fibers

et al. 2015

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We propose a scheme for the emission of few-cycle dispersive waves in the mid-infrared using hollow-core photonic crystal fibers filled with noble gas. The underlying mechanism is the formation of a plasma cloud by a self-compressed, sub-cycle pump pulse. The resulting free-electron population modifies the fiber dispersion, allowing phase-matched access to dispersive waves at otherwise inaccessible frequencies, well into the mid-IR. Remarkably, the pulses generated turn out to have durations of the order of two optical cycles. In addition, this ultrafast emission, which occurs even in the absence of a zero dispersion point between pump and mid-IR wavelengths, is tunable over a wide frequency range simply by adjusting the gas pressure. These theoretical results pave the way to a new generation of compact, fiber-based sources of few-cycle mid-IR radiation.

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Accuracy of the capillary approximation for gas-filled kagomé-style photonic crystal fibers

Cited by 50 publications

References 17 publications

Poor-man’s model of hollow-core anti-resonant fibers

Poor-man’s model of hollow-core anti-resonant fibers

PHz-Wide Spectral Interference Through Coherent Plasma-Induced Fission of Higher-Order Solitons

Photoionization-Induced Emission of Tunable Few-Cycle Midinfrared Dispersive Waves in Gas-Filled Hollow-Core Photonic Crystal Fibers

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