Features of propagation of the high-intensity femtosecond laser pulses in magnesium and sodium fluoride crystals

Bryukvina, L. I.

doi:10.1016/j.jlumin.2015.02.008

Cited by 18 publications

(3 citation statements)

References 20 publications

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“…Apart from the above calculation, such an interpretation of the observed modulation of the filament luminescence intensity is supported by the very recent observation of the periodicity in density of luminescent color centers, induced by very intense 800-nm femtosecond laser pulses in birefringent MgF 2 crystal [19]. The author explained ~30-40 μm periodicity by periodic change in the pulse polarization from linear to circular and vice versa along the propagation path.…”

Section: Resultsmentioning

confidence: 78%

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: Resultsmentioning

confidence: 78%

Periodic femtosecond filamentation in birefringent media

et al. 2015

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“…The use of lithium fluoride crystals in dosimetry and laser physics, in the field of fundamental researches and practical application of color centers induced by high-intensity femtosecond laser pulses [5][6][7][8] is widely known.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Intensity Time Trajectories of F2 Centers in LiF Crystal

Bryukvina

2020

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“…Кристаллы фторида лития (LiF) являются идеальными объектами для изучения фундаментальных явлений на уровне точечных дефектов [1][2][3][4][5][6][7][8], а также широко применяются в дозиметрии [9][10][11][12][13] и лазерной физике [14][15][16]. Особый интерес вызывают исследования, связанные с созданием микроструктур и устройств во фторидах щелочного металла высокоинтенсивными фемтосекундными лазерными импульсами [17][18][19][20][21][22]. Для создания люминесцентных центров окраски (ЦО), которые лежат в основе применений кристаллов, создаются специальные условия выращивания кристаллов и последующей радиационной обработки.…”

Section: Introductionunclassified

Преобразования радиационно-наведенных молекулярных точечных дефектов и центров окраски в кристаллах LiF под воздействием света

Брюквина¹

2019

Физика Твердого Тела

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The effect of UV light and light pulses of the integral light of lamps on γ-irradiated LiF crystals with impurities of hydroxyl ions and magnesium were investigated. The optical absorption and luminescence of color centers at different stages bleaching depending on the exposure time of the crystal under UV light or from the number of light pulses were studied. IR spectra of molecular complexes with hydrogen bond and hydroxyl ions at different stages of bleaching are present. The transformation of complexes with a strong hydrogen bond in complexes with a weak hydrogen bond, and vice versa under the action of light are shown. It is presented as molecular complexes with hydrogen bond affect transformations color centers in the process of crystal bleaching.

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Features of propagation of the high-intensity femtosecond laser pulses in magnesium and sodium fluoride crystals

Cited by 18 publications

References 20 publications

Periodic femtosecond filamentation in birefringent media

Periodic femtosecond filamentation in birefringent media

Fluorescence Intensity Time Trajectories of F2 Centers in LiF Crystal

Преобразования радиационно-наведенных молекулярных точечных дефектов и центров окраски в кристаллах LiF под воздействием света

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