Ultraviolet conical emission produced by high-power femtosecond laser pulse in transparent media

Liu, Z.; Lü, Xingqiang; Liu, Q.; Sun, Shoujin; Li, L.; Liu, X.; Ding, B.; Hu, Bitao

doi:10.1007/s00340-012-5079-5

Cited by 4 publications

(5 citation statements)

References 35 publications

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“…As a result, significant plasma density is generated, resulting in free-carrier absorption and impact ionization which counter balances the self-focusing effect. Thus, the change in the material structure occurs as a result of the dynamical balance between self-focusing due to the nonlinear Kerr effect and self-defocusing associated with the plasma formation which is called filamentation [1][2][3][6][7][8][9][10][11] . The resulted material structural changes are the visible record of pulse plasma interaction.…”

Section: Introductionmentioning

confidence: 99%

Ionization behavior and dynamics of picosecond laser filamentation in sapphire

Amina¹,

Ji²,

Yan³

et al. 2019

Opto-Electronic Advances

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Currently, laser-induced structural modifications in optical materials have been an active field of research. In this paper, we reported structural modifications in the bulk of sapphire due to picosecond (ps) laser filamentation and analyzed the ionization dynamics of the filamentation. Numerical simulations uncovered that the high-intensity ps laser pulses generate plasma through multi-photon and avalanche ionizations that leads to the creation of two distinct types of structural changes in the material. The experimental bulk modifications consist of a void like structures surrounded by cracks which are followed by a submicrometer filamentary track. By increasing laser energy, the length of the damage and filamentary track appeared to increase. In addition, the transverse diameter of the damage zone increased due to the electron plasma produced by avalanche ionizations, but no increase in the filamentary zone diameter was observed with increasing laser energy.

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Section: Introductionmentioning

confidence: 99%

Ionization behavior and dynamics of picosecond laser filamentation in sapphire

Amina¹,

Ji²,

Yan³

et al. 2019

Opto-Electronic Advances

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“…Filamentation of femtosecond laser pulses [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] is a rich interdisciplinary branch of modern physics that deals with the propagation of ultra-intense laser pulses in transparent media. Filamentation with self-stabilized intensity clamping in self-guided channels owing to the dynamic balance between Kerr self-focusing and plasma defocusing, induces plenty of nonlinear optical phenomena, such as self-compression, [6][7][8][9][10][11] THz generation, [12][13][14] the third harmonic generation, [15,16] supercontinuum (SC) generation.…”

Section: Introductionmentioning

confidence: 99%

“…Filamentation with self-stabilized intensity clamping in self-guided channels owing to the dynamic balance between Kerr self-focusing and plasma defocusing, induces plenty of nonlinear optical phenomena, such as self-compression, [6][7][8][9][10][11] THz generation, [12][13][14] the third harmonic generation, [15,16] supercontinuum (SC) generation. [17,18] The SC generation with ultra-broadband spectra covering a spectral range from near infrared (IR) to ultraviolet (UV) was intensively investigated in different optical media [19][20][21][22][23] and stimulates important applications in various fields. [24][25][26][27][28] Several nonlinear processes, such as the self-phase modulation, four-wave mixing and selfsteepening, are now understood to broaden the pulse spectrum and contribute to SC generation.…”

Section: Introductionmentioning

confidence: 99%

Spectral modulation and supercontinuum generation assisted by infrared femtosecond plasma grating

Liu¹,

Sun²,

Shi³

et al. 2013

Chinese Phys. B

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Spectral modulation and supercontinuum generation of a probe pulse is investigated by using the plasma grating induced by the interference of two infrared femtosecond laser pulses. The dependences of the supercontinuum generation from the probe pulse on the time delay, the relative polarization angle between the probe pulse and the two-pump pulses, and the input probe pulse energy are investigated. The far-field spatial profiles of the three pulses are measured with different time delays and relative polarization angle, and the core energy of the probe pulse as functions of the time delay and relative polarization angle are also shown.

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“…Two obvious filaments are found at the trajectory of the incident laser beam, while six separated filaments are found at different parts of the reflective trajectory. With further propagation of the laser beam, the beam's size increases slightly due to the interaction of the multifilaments, i.e., the distances among filaments increase with the propagation distance [16] . After the reflection at the air-glass surface, six separated filaments are formed at different parts of the trajectory of the reflective beam.…”

mentioning

confidence: 99%

“…3(a). For the conical emission generated by a femtosecond laser filamentation inside a solid transparent medium, the far-field spatial profile appears as a white spot in the center surrounded by colored concentric rings, and the white spot is round and is where the energy is concentrated [16] . However, the shape of the spot shown in Fig.…”

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confidence: 99%

Propagation of a filamentary femtosecond laser beam with high intensities at an air-solid interface

et al. 2017

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The propagation of a filamentary laser beam at an air-glass surface is studied by setting the incident angle satisfying the total reflection condition. The images of the trajectory of the filamentary laser beam inside the sample and the output far-field spatial profiles are measured with varying incident laser pulse energies. Different from the general total reflection, a transmitted laser beam is detected along the propagation direction of the incident laser beam. The energy ratio of the transmitted laser beam depends on the pulse energies of the incident laser beam. The background energy reservoir surrounding the filament core can break the law of total reflection at the air-glass surface, resulting in the regeneration of the transmitted laser beam.OCIS The self-guided propagation of intense femtosecond laser pulses in transparent media results in the generation of extended plasma channels that have exciting potential applications in the field of fundamental nonlinear optical physics [1][2][3][4][5] . A single and stable filament can be generated by using a conventional lens reaching a few tens of millimeters or even meters, if the laser intensity exceeds the critical power P cr . Multifilaments will be formed as the incident pulse exceeding the critical power by an order of magnitude, which is unstable both in space and time [6] . Investigations on the characterization of a single filament with the incident laser power P ≥ P cr and the interactions among multifilaments were performed to search for further applications of laser filamentation, e.g. amplified spontaneous emission air lasing in both the backward and forward directions [7,8] . Meanwhile, the propagation characteristics were also studied. Polynkin et al. experimentally observed the generation of curved plasma channels in both air and water by applying femtosecond Airy beams [9,10] . An extended and robust thermal waveguide structure in air with a lifetime of several milliseconds can be formed with femtosecond filaments [11] , making possible the very-long-range guiding and distant projection of high-energy laser pulses and high average power beams.However, the propagation characteristics of high power pulsed lasers at the interfaces of different transparent materials are ignored, particularly those of femtosecond filament. The air-glass surface is now widely used for the imaging of the lateral distribution of a filament [12][13][14] ; however, the propagation characteristics are neglected. Setting the incident angle satisfying the total reflection condition, the propagation of a femtosecond filament at an air-glass surface is studied by showing the imaging of the propagation trajectory, the far-field profiles in this Letter. The dependence of the pulse energy of the reflective beam on the incident pulse energy is also measured. Figure 1 shows the experimental setup. The basic parameters of the femtosecond laser beam are a pulse energy of 1.1 mJ, a central wavelength of 800 nm, a pulse duration of 60 fs, and a repetition rate of 1.0 kHz. One set of ...

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Ultraviolet conical emission produced by high-power femtosecond laser pulse in transparent media

Cited by 4 publications

References 35 publications

Ionization behavior and dynamics of picosecond laser filamentation in sapphire

Ionization behavior and dynamics of picosecond laser filamentation in sapphire

Spectral modulation and supercontinuum generation assisted by infrared femtosecond plasma grating

Propagation of a filamentary femtosecond laser beam with high intensities at an air-solid interface

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