High spectral power femtosecond supercontinuum source by use of microlens array

Camino, Acner; Hao, Zuoqiang; Liu, Xu; Lin, Jingquan

doi:10.1364/ol.39.000747

Cited by 35 publications

(17 citation statements)

References 27 publications

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“…In recent years, numerous studies have been performed to optimize filamentation and SC, in order to achieve high-power, ultra-broadband, and controllable SC spectrum. For example, in our previous work, we have generated a filament array in fused silica by using microlens array as the focal element and obtained a high power density SC with mW/nm level in the visible range [18]. Lu et al obtained an intense femtosecond SC by placing several thin fused silica plates at or near the focus Photonics 2021, 8, 339 2 of 8 of a high-power laser pulse.…”

Section: Introductionmentioning

confidence: 99%

Spectral Hump Formation in Visible Region of Supercontinuum from Shaped Femtosecond Laser Filamentation in Fused Silica

Chang

et al. 2021

Photonics

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We investigate experimentally the local intensity control in the visible region of the supercontinuum (SC) generated from femtosecond laser filamentation in fused silica by using pulse shaping technology. Based on the genetic algorithm, we show that a distinct spectral hump at any preset wavelength can be formed in the blue-side extension. The local intensity control in the SC could improve the abilities of the SC applications.

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Section: Introductionmentioning

confidence: 99%

Spectral Hump Formation in Visible Region of Supercontinuum from Shaped Femtosecond Laser Filamentation in Fused Silica

Chang

et al. 2021

Photonics

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“…However, it is always anticipated for the realization of controllable field collapse and sequent filamentation, due to its practical applications, such as guiding microwave radiation [14], enhancement of terahertz emission [15], generation of millijoule-level supercontinuum in solid media [16], etc. For those purposes, some methods have been proposed by controlling the input power and divergence angle [17], shaping the field profile [18,19], using the amplitude/phase mask [20][21][22][23], and introducing the spatial regularization [24].…”

Section: Introductionmentioning

confidence: 99%

Controlling optical field collapse by elliptical symmetry hybrid polarization structure

et al. 2018

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Engineering the diversity of the spatial structure of polarization states offers a new approach to produce controllable and designable filament patterns. Here we predict theoretically and demonstrate experimentally the novel collapsing behaviors of the optical fields by using the elliptical symmetry hybrid polarization structure in a self-focusing Kerr medium. The results reveal that the distribution of the hybrid polarization states, the spin angular momentum (SAM) gradient, and the collapsing patterns could be manipulated by changing the eccentricity, the topological charge, and the initial phase of the optical field. Owing to the synergy of the hybrid polarization states and its spatial symmetry, the collapsing behaviors are controllable, and have the robust feature insensitive to the random noise. Our idea may offer an alternative route to produce the controllable and robust multiple filamentation in other nonlinear systems, thereby facilitating the development of additional surprising applications.

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“…The filament distribution in an array can be even more deterministic if the position of each beam is managed independently. This is obtained by multiple beam generation using arrays of axicons [23,24] or microlenses [25][26][27].The question motivating our study is how to ensure that the initial multifilament distribution remains unchanged during the propagation or evolves in a predictable manner. This evolution is governed by the stability of a single filament in the array and by the mutual interaction between the neighboring filaments.…”

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confidence: 99%

“…The initial power per beam normalized to the critical power in air P cr = 3.77λ 2 /(8πn 2 ) = 1.6 GW is calculated as In our studies, input beams have spatial width σ = 0.15-0.20 mm, which is approximately twice the width of a filament. Intensity distributions similar to our inputs were generated by a wide Gaussian beam impinging on an array of microlenses [25][26][27]. Let us first consider a large (15 × 15) in-phase array of Gaussian beams forming filaments.…”

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Dynamics of Large Femtosecond Filament Arrays: Possibilities, Limitations, and Trade-Offs

Walasik

Litchinitser

2016

ACS Photonics

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Stable propagation of large, multifilament arrays over long distances in air paves new ways for microwave-radiation manipulation. Although, the dynamics of a single or a few filaments was discussed in some of the previous studies, we show that the stability of large plasma filament arrays is significantly more complicated and is constrained by several trade-offs. Here, we analyze the stability properties of rectangular arrays as a function of four parameters: relative phase of the generating beams, number of filaments, separation between them, and initial power. We find that arrays with alternating phase of filaments are more stable than similar arrays with all beams in phase. Additionally, we show that increasing the size of an array increases its stability, and that a proper choice of the beam separation and the initial power has to be made in order to obtain a dense and regular array of filaments. PACS numbers: 52.38.Hb, 42.65.Sf, 42.65.Tg, 42.65.Jx High-power femtosecond laser-pulse filamentation is a flourishing field of nonlinear optics due to its numerous applications in remote sensing, lightning protection, virtual antennas, and waveguiding [1][2][3]. Experiments show that a femtosecond laser beams can ionize atmosphere at the kilometer-scale distances [4]. Propagation over such long distances is a result of the dynamic balance between the focusing Kerr nonlinearity, diffraction, and plasma defocusing due to multiphoton absorption. A proper arrangement of plasma channels into arrays built of multiple filaments can lead to control [5] and efficient guiding of electromagnetic radiation in air [6]. Dielectric [7] and hollow-core metallic waveguide configurations [8,9] were predicted theoretically and demonstrated experimentally [10] to guide microwave radiation. Periodic arrays of densely packed high-intensity filaments were shown to create a hyperbolic metamaterial medium, that allows for radar signal manipulation and resolution enhancement [11,12].Formation of desired, regular filament patterns requires precise control of filament distribution and interaction. Multiple filaments can be generated by an intense Gaussian beam [13,14], whose power is much higher than the critical power of self-focusing P cr . However, the distribution of filaments resulting from the breakup of a Gaussian beam is determined by intensity fluctuations [15] and modulation instability [16,17]. Moreover, the density of filaments generated in this way is limited [18,19]. Therefore, this method can not provide the fine control and the high filament density required for the microwave-radiation manipulation. A certain degree of control of the filament distribution can be obtained by special preparation of the Gaussian beam. It was demonstrated experimentally that the predetermined initial phase [20,21], amplitude distribution [15], and geometry of the beam [22] offer a limited control of the filamentation pattern. The filament distribution in an array can be even more deterministic if the position of each beam is managed independentl...

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High spectral power femtosecond supercontinuum source by use of microlens array

Cited by 35 publications

References 27 publications

Spectral Hump Formation in Visible Region of Supercontinuum from Shaped Femtosecond Laser Filamentation in Fused Silica

Spectral Hump Formation in Visible Region of Supercontinuum from Shaped Femtosecond Laser Filamentation in Fused Silica

Controlling optical field collapse by elliptical symmetry hybrid polarization structure

Dynamics of Large Femtosecond Filament Arrays: Possibilities, Limitations, and Trade-Offs

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