Control of filament branching in air by astigmatically focused femtosecond laser pulses

Fu, Yao; Gao, Hui; Chu, Wei; Ni, Jielei; Xiong, Hui; Xu, Huailiang; Yao, Jinping; Zeng, Bin; Liu, Weiwei; Cheng, Ya; Xu, Zhizhan; Chin, See Leang

doi:10.1007/s00340-011-4424-4

Cited by 15 publications

(11 citation statements)

References 29 publications

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“…(7). However, it might not be fulfilled in experiment either because of the non-perfect laser output or artificial beam shaping, such as synthesizing Airy beam [26,27], focusing by axicon [28][29][30], or introducing astigmatism [31,32]. Especially, due to the strong self-transformation during femtosecond laser filamentation, the laser pulse may not preserve Gaussian profile in time and space as what has been revealed in [33].…”

Section: Experiments and Resultsmentioning

confidence: 99%

Simple method of measuring laser peak intensity inside femtosecond laser filament in air

Sun

Zeng

et al. 2011

Opt. Express

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Measurement of laser intensity inside a femtosecond laser filament is a challenging task. In this work, we suggest a simple way to characterize laser peak intensity inside the filament in air. It is based on the signal ratio measurement of two nitrogen fluorescence lines, namely, 391 nm and 337 nm. Because of distinct excitation mechanisms, the signals of the two fluorescence lines increase with the laser intensity at different orders of nonlinearity. An empirical formula has been deduced according to which laser peak intensity could be simply determined by the fluorescence ratio.

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Section: Experiments and Resultsmentioning

confidence: 99%

Simple method of measuring laser peak intensity inside femtosecond laser filament in air

Sun

Zeng

et al. 2011

Opt. Express

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“…This is particularly true for amplifiers with relatively low repetition rate, i.e., 1‐kHz Ti:Sapphire amplifiers. [ 13 ]…”

Section: Possibilities and Advantages Of Volume Plasma Gratingsmentioning

confidence: 99%

“…[ 22 ] It was demonstrated that direct writing via filamentation by using astigmatically focused fs beam promoted the speed of fabrication, which was able to encode a 3 mm×2 mm micro‐grating in 10 min. [ 13 ] However, the focus of a fs beam can generate multiple filamentation, when the incident power exceeds the critical power for self‐focusing. Multiple filamentation builds up on noises in the initial beam or instabilities introduced by the medium so that gives rise to randomly intensity distribution.…”

Section: Introductionmentioning

confidence: 99%

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Filamentation‐Induced Volume Plasma Grating: Dynamics, Possibilities, and Advantages

Yuan

Nan

et al. 2023

Laser & Photonics Reviews

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Stable propagation of laser filamentation arrays paves new ways for cross‐scale manufacturing. Although a single filament or multiple filaments can be used for laser processing in transparent media, sustainable developments of higher throughput and lower energy consumption are always the pursuit. Here, a proof‐of‐concept approach is proposed in which cross‐scale manufacturing of 3D microstructures is realized via an ionization‐induced volume plasma grating. The volume plasma grating is generated by the noncollinear interaction of two batches of arrays of multiple filaments. The volume plasma grating cannot only regulate the distribution of multiple filamentation but also promote the intensity inside the filaments. By this approach, 3D microstructures are written by 1D sample translation. In addition, rapid fabrications of volume gratings and terahertz wire grid polarizers (THz WGPs) are demonstrated by laser modification using volume plasma grating. The characteristics of the fabricated THz WGPs are comparable to those of commercial ones. The limitations and future implementations of this approach are discussed.

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“…1 When the laser power is higher than a certain critical value, the multi-filamentation can be observed experimentally due to the fluctuation in intensity or the perturbation in index. [2][3][4][5] Many efforts have focused on the control of multiple filaments, such as by using the deformable mirror, 6 the axicon, 7-10 the phase plate, [11][12][13][14] the pinhole, 15 the diffractive elements, 16,17 the mesh, 18,19 the astigmatic focusing, 20,21 the beam size, [22][23][24] the ellipticity, [25][26][27][28] the cylindrical lens, 29 the microlens array, 30 and the hybridly polarized vector fields. 31 In this article, we present a scheme for controlling the fs multi-filamentation with the engineerable quantity and locations in a K9 glass (it is almost the same as BK-7 glass, so for all parameters used for K9 here, we can adopt those for BK-7 32,33 ).…”

Section: Introductionmentioning

confidence: 99%

Control of femtosecond multi-filamentation in glass by designable patterned optical fields

Cai

Lü

et al. 2016

AIP Advances

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We present a scheme for realizing femtosecond multi-filamentation with designable quantity and locations of filaments, based on the control of multi-focal spots formed by patterned optical fields (POFs) composed of multiple individual optical fields (IOFs). A computer-controlled spatial light modulator is used to engineer the POFs. In particular, we introduce a blazed phase grating in any IOF, which increases a degree of freedom, making the engineering of multi-focal spots becomes more flexible. We achieve experimentally the aim controlling femtosecond multi-filamentation in a K9 glass. Our scheme has great flexibility and convenience in controlling the multi-filamentation in quantity and locations of filaments and strength of interaction between filaments.

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Control of filament branching in air by astigmatically focused femtosecond laser pulses

Cited by 15 publications

References 29 publications

Simple method of measuring laser peak intensity inside femtosecond laser filament in air

Simple method of measuring laser peak intensity inside femtosecond laser filament in air

Filamentation‐Induced Volume Plasma Grating: Dynamics, Possibilities, and Advantages

Control of femtosecond multi-filamentation in glass by designable patterned optical fields

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