Comparison of supercontinuum spectrum generating by hollow core PCFs filled with nitrobenzene with different lattice types

Van, Lanh Chu; Thị, Thủy Nguyễn; Trong, Duc Hoang; Tran, Bao Tran Le; Minh, Ngoc Vo Thi; Dang, Van Trong; Canh, Trung Le; Dinh, Quang Ho; Quoc, K. Doan

doi:10.1007/s11082-022-03667-y

Cited by 14 publications

(8 citation statements)

References 36 publications

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“…For ANDi, the fiber [44] can generate highly coherent SCGs with near-zero dispersion peaks. The shape of the dispersion curves for [27] and #F 1 are similar. However, the center wavelengths of the pump lasers for the fibers [27,44] are further away from the maximum dispersion value and visible range compared to #F 1 .…”

Section: Optimization Of Pcf Characteristics For Scgmentioning

confidence: 69%

“…Most work on SCG uses chloroform (CHCl [11,12,[24][25][26][27][28][29]. CS 2 has a high nonlinear refractive index n 2 = 514 × 10 −20 m 2 W −1 at 1064 nm [28], which is 100 times higher than n 2 = 2.74 × 10 −20 m 2 W −1 of silica (SiO 2 ) glass [30].…”

Section: Introductionmentioning

confidence: 99%

“…It is transparent in the wavelength range of 0.5-2.2 μm, highly toxic, carcinogenic, and explosive. C 6 H 5 NO 2 and C 7 H 8 have relatively low transparency in the NIR region, which reduces the spectral broadening of PCFs [11,27]. The advantage of C 2 H 4 Br 2 , C 2 Cl 4 , CHCl 3 , and CCl 4 is that they have moderate toxicity, but their linear refractive index is lower than others, leading to reduced nonlinear coefficients [24][25][26]29].…”

Section: Introductionmentioning

confidence: 99%

“…Also, group velocity dispersion is low in the normal dispersion regime, leading to longer dispersion lengths and a higher degree of soliton interaction [33]. Lanh et al [27] showed that PCFs containing C 6 H 5 NO 2 cores in circular matrices have lower attenuation and higher nonlinearity compared to square and hexagonal lattices, which have potential applications in SC spectrum generation. A number of research papers on the use of circular PCFs have been published in recent years [32,[34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Circular lattice benzene-core PCFs with flat near-zero dispersion for low-power broad-spectrum supercontinuum generation

Le Tran,

Van

2024

Phys. Scr.

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A circular photonic crystal fiber infiltrated with benzene with different air-hole diameters is proposed as a new supercontinuum light source. Optical properties related to dispersion, effective mode area, nonlinear coefficient, and attenuation of the fundamental mode are investigated numerically. Two optimized structures are selected and verified against supercontinuum generation (SCG) in detail. The first structure (#F1) possesses all-normal dispersion, while the second (#F2) has a zero-dispersion wavelength. The possibility of coherent, octave-spanning SCG is proved by a 40 fs pulse, 1.064 μm wavelength, and 0.45 kW of power in-coupled into the core of #F1. Otherwise, injecting a 90 fs duration, 1.5 μm wavelength, and 0.555 kW peak power pump pulse into #F2 generates a broad SC spanning 0.76–4.23 µm. With the advantages of flat near-zero dispersion, high nonlinearity, low attenuation, and low input power used for SCG, the proposed fibers may lead to new low-cost all-fiber optical systems.

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Section: Optimization Of Pcf Characteristics For Scgmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Circular lattice benzene-core PCFs with flat near-zero dispersion for low-power broad-spectrum supercontinuum generation

Le Tran,

Van

2024

Phys. Scr.

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“…Due to their high Kerr coefficients, they have been utilized for various NLO photonic applications, including supercontinuum generation, liquid focusing lenses, and OKE spectroscopy. [4,5,[25][26][27] NB is one of the most efficient Kerr active materials among many organic solvents showing a Kerr effect. [14,[28][29][30] However, the existence of linear and strong twophoton absorption (2PA) in NB deteriorates the efficiency of Kerr nonlinearity in some cases due to the dominant thermal effect.…”

Section: Introductionmentioning

confidence: 99%

Electric Control of Thermal Contributions to the Nonlinear Optical Properties of Nitrobenzene

Bongu,

Buchmüller,

Neumaier

et al. 2023

Advanced Physics Research

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Thermal effects are inevitable when an absorptive nonlinear optical material interacts with long pulse duration or high repetition rate laser pulses. It results in inaccurate characterization and reduction in efficiency of the nonlinear materials for device applications. In this article, the study investigates the influence of an external electric field on the thermal contribution to the nonlinear optical response of nitrobenzene (NB). Z‐scan measurements are performed on NB using 330 ps laser pulses at a wavelength of 532 nm with variable (10 Hz to 1 kHz) repetition rates. At low repetition rates, NB shows a positive nonlinear refractive index (+ n2), which leads to self‐focusing of the laser beam due to the optical Kerr effect. Cumulative thermal effects occur above a repetition rate of 200 Hz. At high repetition rates (>750 Hz), the sign of n2 becomes negative, implying a self‐defocusing behavior of the sample arising from the thermal‐induced nonlinear refractive index. By applying an external DC field to the NB, a reduction of the thermal contribution can be observed. At a sufficiently high electric field strength, the thermal contribution is suppressed and the inherent Kerr nonlinearity can be observed despite the high repetition rate of the pump laser.

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Design and Optimization of C₆H₅NO₂‐Core Photonic Crystal Fibers for Broadband Supercontinuum Generation with Low Peak Power

Dang

Van

2023

Cryst. Res. Technol.

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This study presents a new square‐lattice photonic crystal fiber (PCF) with a nitrobenzene core. Considering the non‐uniformity of the air hole diameter, this new design allows the characteristic quantities to be optimized simultaneously to ensure near‐zero dispersion, a small effective mode area, and low loss for efficient spectral broadening. The spectrum broadens significantly at peak powers many times lower than in previous studies. Based on the obtained results, two optimal PCFs are proposed and validated in detail for supercontinuum generation (SCG). The first fiber #F1 operates in an all‐normal dispersion regime with a pump wavelength of 1.3 µm.It produces a spectral supecontinuum (SC) from 0.726 to 1.649 µm with a pulse duration of 90 fs and a peak power of 133 W. Meanwhile, the second fiber #F2 operates in anomalous dispersion regime with a pump wavelength of 1.61 µm. With a low peak power of 300 W and a pulse duration of 150 fs, the fiber #F2 provides SC generation with bandwidth from 0.805 µm to 3.970 µm. The proposed fibers are suitable for all‐fiber SC light sources, respectively, and may lead to new low‐cost all‐fiber optical systems.

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Comparison of supercontinuum spectrum generating by hollow core PCFs filled with nitrobenzene with different lattice types

Cited by 14 publications

References 36 publications

Circular lattice benzene-core PCFs with flat near-zero dispersion for low-power broad-spectrum supercontinuum generation

Circular lattice benzene-core PCFs with flat near-zero dispersion for low-power broad-spectrum supercontinuum generation

Electric Control of Thermal Contributions to the Nonlinear Optical Properties of Nitrobenzene

Design and Optimization of C₆H₅NO₂‐Core Photonic Crystal Fibers for Broadband Supercontinuum Generation with Low Peak Power

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Comparison of supercontinuum spectrum generating by hollow core PCFs filled with nitrobenzene with different lattice types

Cited by 14 publications

References 36 publications

Circular lattice benzene-core PCFs with flat near-zero dispersion for low-power broad-spectrum supercontinuum generation

Circular lattice benzene-core PCFs with flat near-zero dispersion for low-power broad-spectrum supercontinuum generation

Electric Control of Thermal Contributions to the Nonlinear Optical Properties of Nitrobenzene

Design and Optimization of C6H5NO2‐Core Photonic Crystal Fibers for Broadband Supercontinuum Generation with Low Peak Power

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Design and Optimization of C₆H₅NO₂‐Core Photonic Crystal Fibers for Broadband Supercontinuum Generation with Low Peak Power