Highly nonlinear fundamental mechanisms of excitation and coloring of wide-gap crystals by intense femtosecond laser pulses

Мартынович, Е. Ф.; Glazunov, D. S.; Grigorova, A. A.; Starchenko, A. A.; Kirpichnikov, A. V.; Trunov, V. I.; Merzlyakov, M. A.; Petrov, V. V.; Pestryakov, E. V.

doi:10.1134/s0030400x0809004x

Cited by 16 publications

(9 citation statements)

References 4 publications

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“…Alternatively, electrons can be trapped in the UV or valence bands, modifying electronic properties of the material, and consequently changing its refractive index. These processes and similar ones happen in glasses (Courrol et al, 2008), crystals (Martynovich et al, 2008;Orlando et al, 2010), and polymers , and when these defects are created with spatial control inside the material, structures such as waveguides (Nolte et al, 2003), diffraction gratings (Hirao & Miura, 1998) and photonic devices (Florea & Winick, 2003;Minoshima et al, 2001) can be manufactured by the ultrashort pulses. Once again, all these processes benefit from the minimized heat generation that preserves the material properties in the surroundings of the created structures.…”

Section: Ionization By Ultrashort Pulsesmentioning

confidence: 99%

Ultrashort Laser Pulses Applications

Samad¹,

Courrol²,

Baldochi³

et al. 2010

Coherence and Ultrashort Pulse Laser Emission

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Section: Ionization By Ultrashort Pulsesmentioning

confidence: 99%

Ultrashort Laser Pulses Applications

Samad¹,

Courrol²,

Baldochi³

et al. 2010

Coherence and Ultrashort Pulse Laser Emission

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“…However, when the intensity of laser radiation is high the processes of highly nonlinear interaction of light with matter begin. Nonlinear absorption of light is ensured by the excitation of the electronic subsystem of the dielectric, mostly by electron-hole pairs and excitons [1]. The storage of energy in pure perfect dielectric, for example, in ionic crystals, in the form of intrinsic electronic excitations is possible only during the short lifetime of these excitations.…”

Section: Introductionmentioning

confidence: 99%

“…It is known that luminescent defects are effectively created by intense femtosecond pulses during the irradiation of dielectric crystals, predominantly with excitonic mechanism of defect formation [1][2]. Defects induced by femtosecond laser pulses in such crystals are simple and aggregate color centers, characteristic for radiation staining [4][5].…”

Section: Introductionmentioning

confidence: 99%

The accumulation of femtosecond laser radiation energy in crystals of lithium fluoride

et al. 2015

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We present the results of studies of energy accumulation during the non-destructive interaction of extremely intense near infrared laser radiation with model wide band gap dielectric crystals of lithium fluoride, when the intensity of pulses is sufficient for effective highly nonlinear absorption of light and for the excitation of the electron subsystem of matter and the energy of pulses is still not sufficient for significant heating, evaporation, laser breakdown or other destruction to occur. We studied the emission of energy in the form of light sum of thermally stimulated luminescence accumulated under conditions of self-focusing and multiple filamentation of femtosecond laser radiation. It was established that it's the F 2 and F 3 + color centers and supplementary to them centers of interstitial type which accumulate energy under the action of a single femtosecond laser pulses. When irradiated by series of pulses the F 3 , F 3 -and F 4 centers additionally appear. F 2 centers are the main centers of emission in the process of thermally stimulated luminescence of accumulated energy. The interstitial fluoride ions (I-centers) are the kinetic particles. They split off from the X 3 -centers in the result of thermal decomposition of latter on the I-centers and molecules X 2 0 . I-centers recombine with F 3 + centers and form F 2 centers in excited state. The latter produce the characteristic emission spectrum emitted in the form of thermally stimulated luminescence.

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“…The broadband optical emission peaking at approximate 680 nm should be ascribed to F 2 centers. Therefore, the F, F 2 , and F þ 3 CCs were mainly induced by the femtosecond laser irradiation under the present irradiation conditions [18,19,27,28] . We propose that multi-photon ionization is the starting mechanism for CC formation under femtosecond laser irradiation.…”

mentioning

confidence: 99%

“…We assume that coloring includes the formation of electrons (e) and holes (p) that then form excitons through recombination. Then the process develops according to the following scheme [27,29,30] :…”

mentioning

confidence: 99%

Simultaneous upconversion luminescence and color centers generated by femtosecond laser irradiation of LiF crystals

et al. 2016

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We report the upconversion luminescence of lithium fluoride single crystals excited by an infrared femtosecond laser at room temperature. The luminescence spectra demonstrate that upconversion luminescence originates from the color center of F þ 3 . The dependence of fluorescence intensity on pump power reveals that a two-photon excitation process dominates the conversion of infrared radiation into visible emission. Simultaneous absorption of two infrared photons is suggested to produce the F þ 3 center population, which leads to the characteristic visible emission. The results are on the reveal and evaluation of the simultaneous two-photon absorption on the green upconversion process.

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Highly nonlinear fundamental mechanisms of excitation and coloring of wide-gap crystals by intense femtosecond laser pulses

Cited by 16 publications

References 4 publications

Ultrashort Laser Pulses Applications

Ultrashort Laser Pulses Applications

The accumulation of femtosecond laser radiation energy in crystals of lithium fluoride

Simultaneous upconversion luminescence and color centers generated by femtosecond laser irradiation of LiF crystals

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