Effect of spherical aberration on the propagation of a tightly focused femtosecond laser pulse inside fused silica

Sun, Quan; Hong-bing, Jiang; Liu, Yi; Zhou, Yongheng; Yang, Hong; Gong, Qihuang

doi:10.1088/1464-4258/7/11/006

Cited by 69 publications

(31 citation statements)

References 22 publications

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“…Longitudinal periodicity of different nature has been observed earlier in femtosecond filaments in isotropic media [5][6][7][8][9] in tight focusing conditions (NA > 0.3). In most cases, such a periodicity is associated with the…”

Section: Introductionsupporting

confidence: 53%

“…Up to three peaks of on-axis luminescence intensity were observed when the authors of [6] focused a femtosecond laser pulse into an isotropic fused silica sample with a high-NA objective. Multiple irregular refocusing of tightly focused femtosecond laser pulse, with the distance between the refocusing maxima varying from 20 to 40 μm, was observed inside fused silica in [7]. The phenomenon was associated with the focal spot extension along the propagation axis due to the spherical aberration, induced by the air-sample interface.…”

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confidence: 95%

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Periodic femtosecond filamentation in birefringent media

et al. 2015

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phenomenon of multiple refocusing [5]. Up to three peaks of on-axis luminescence intensity were observed when the authors of [6] focused a femtosecond laser pulse into an isotropic fused silica sample with a high-NA objective. Multiple irregular refocusing of tightly focused femtosecond laser pulse, with the distance between the refocusing maxima varying from 20 to 40 μm, was observed inside fused silica in [7]. The phenomenon was associated with the focal spot extension along the propagation axis due to the spherical aberration, induced by the air-sample interface. It was shown in [8] that filaments generated by pulsed Bessel beams form discrete equidistant damage spots in borosilicate glass. These discrete damage traces are attributed to the beating between the Bessel beam and the axial radiation. Regular focusing-refocusing events of similar nature were observed in [9] in barium fluoride crystal in the filaments, excited by axicon-formed femtosecond Bessel pulses.Several papers examined femtosecond filamentation in solid birefringent media, which are of great interest as structural materials for femtosecond lasers (see, e.g., [10][11][12][13][14][15]). A simplified case of the filament excitation only by ordinary or extraordinary ray was addressed in most of these studies.In this paper, we report on the observation of longitudinally periodic filamentation of femtosecond laser radiation in positive (n o < n e ; crystalline quartz) and negative (n o > n e ; sapphire) birefringent crystalline media in loose focusing conditions (NA = 0.02). We focus on little studied and unattainable in isotropic material peculiarities of the filamentation process, which are caused by spatial and temporal overlap of ordinary (o) and extraordinary (e) pulses inside the crystal. It is in this case the specificity of femtosecond filamentation in birefringent medium is shown in full. AbstractWe report on the experimental observation of periodic modulation of the axial luminescence intensity along the femtosecond filament track in sapphire and crystal quartz. The physical reason for the modulation is a cyclic transformation of the polarization state of the light pulse traveling in birefringent medium, caused by the phase raid between the ordinary and extraordinary rays, and different cross sections of multiphoton absorption for linear and circular polarizations.

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Section: Introductionsupporting

confidence: 53%

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confidence: 95%

Periodic femtosecond filamentation in birefringent media

et al. 2015

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“…The difference in volume variation observed between the two loading cases is attributed to a dispersion of the focus due to spherical aberration effects. In particular, as demonstrated in [67], the nonlinear interaction zone extends as the foci range Δ (Figure 8b) depends linearly on the focusing depth:…”

Section: Micromachines 2015 6 1375mentioning

confidence: 65%

A Monolithic Micro-Tensile Tester for Investigating Silicon Dioxide Polymorph Micromechanics, Fabricated and Operated Using a Femtosecond Laser

Athanasiou

Bellouard

2015

Micromachines

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Mechanical testing of materials at the microscales is challenging. It requires delicate procedures not only for producing and handling the specimen to be tested, but also for applying an accurate and controlled force. This endeavor is even more challenging when it comes to investigating the behavior of brittle materials such as glass. Here, we present a microtensile tester for investigating silica glass polymorphs. The instrument is entirely made of silica and for which the same femtosecond laser is not only used for fabricating the device, but also for operating it (loading the specimen) as well as for performing in situ measurements. As a proof-of-concept, we present a stress-strain curve of fused silica for unprecedented high tensile stress of 2.4 GPa, as well as preliminary results of the elastic modulus of femtosecond laser-affected zones of fused silica, providing new insights on their microstructures and mechanical behavior.

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“…By paraxial approximation and using the Snell's law on the interface, n 2 sin 2 = n 1 sin 1 = NA is satisfied, and the longitudinal aberration range, l pa , due to spherical aberration, which is the distance from the paraxial-ray focal plane to the peripheral-ray focal plane can be written as [16,17] …”

Section: Channel Formation and Focusing Effectmentioning

confidence: 99%

Single step channeling in glass interior by femtosecond laser

Kongsuwan

Wang

Yao

2012

Journal of Applied Physics

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Channeling inside a transparent material, glass, by femtosecond laser was performed by using a single step process rather than hybrid processes that combine the laser irradiation with an additional tool or step to remove the material. Tightly focusing of a single femtosecond laser pulse using proper optical and laser processing parameters could induce the microexplosion and could create voids inside transparent materials, and the effects of these parameters on the resultant feature geometry and channel length were studied. Understanding of the channel length variation at different locations from the specimen surface could enhance prediction capability. Taking into account of the laser, material, and lens properties, numerical models were developed to predict the absorption volume shape and size at different focusing depths below the surface of a specimen. These models will also be validated with the variation in feature and channel lengths inside the specimen obtained from the experiments. Spacing between adjacent laser pulses and laser parameters were varied to investigate effects of channel overlapping and its influence on long channel formation.

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Effect of spherical aberration on the propagation of a tightly focused femtosecond laser pulse inside fused silica

Cited by 69 publications

References 22 publications

Periodic femtosecond filamentation in birefringent media

Periodic femtosecond filamentation in birefringent media

A Monolithic Micro-Tensile Tester for Investigating Silicon Dioxide Polymorph Micromechanics, Fabricated and Operated Using a Femtosecond Laser

Single step channeling in glass interior by femtosecond laser

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