Nonlinear excitation of luminescence of wide-gap crystals by femtosecond laser emission

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Resumo

The features of nonlinear excitation of photoluminescence of wide-gap crystals by femtosecond laser emission have been studied. It has been established that during multiphoton ionization of the intrinsic substance of crystals, the excitation of intrinsic 2pO2– valence photoluminescence has a long-wave threshold. The photoluminescence yield of impurities, excited by the capture of induced band electrons and holes during the nonlinear ionization of a substance, reaches saturation with increasing intensity of femtosecond laser pulses.

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Sobre autores

V. Baryshnikov

Irkutsk State Transport University

Autor responsável pela correspondência
Email: vibh@rambler.ru
Rússia, Irkutsk

O. Goreva

Irkutsk State Transport University

Email: vibh@rambler.ru
Rússia, Irkutsk

T. Kolesnikova

Irkutsk State Transport University

Email: vibh@rambler.ru
Rússia, Irkutsk

O. Nikonovich

Irkutsk State Transport University

Email: vibh@rambler.ru
Rússia, Irkutsk

Yu. Murzina

Irkutsk State Transport University

Email: vibh@rambler.ru
Rússia, Irkutsk

Bibliografia

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2. Fig. 1. Spectrogram (a) and single-pulse spectrum of Ce3+ PL and valence 2pO2– PL in nominally pure Y3Al5O12 crystals at 300 K (b). Excitation of 2ω: Ti:Sp laser: λ = 390 nm; 50 fs; 0.1 GW cm–2. Registration: delay 5 ns, exposure 100 ns. Steady-state optical absorption spectrum (c).

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3. Fig. 2. Oscillogram of PL pulses of nominal purity Y3Al5O12 crystals at 300 K: valence 2pO2– in the band at 380 nm (1) and Ce3+ at 530 nm (2), excited by radiation of a 2ω: Ti:Sp laser (400 nm; 50 fs; 80 MHz; 0.1 GW cm–2).

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4. Fig. 3. Spectrogram (1) and spectrum (2) of the valence 2pO2– PL of a high-purity Al2O3 crystal under four-photon excitation by a 2ω: Ti:Al2O3 laser (50 fs; 360 nm; 1.5 GW cm–2). Registration: delay 5 ns, exposure 10 ns. Spectrum of four-photon excitation of 2pO2– PL (3). On the left is the structure of the valence 2pO2– band and the mechanism of nonlinear excitation of 2pO2– valence PL.

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5. Fig. 4. Dependence of the yield of valence 2pO2– PL in Y3Al5O12 (1) and Ce3+ PL in Y3Al5O12 (2), Ce:YAlO3 (3) at 300 K on the excitation intensity of 2ω:Ti:Sp laser radiation: λ = 360 nm, 50 fs. Crystals of nominal purity.

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