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Nonlinear optical phenomena
Transient light absorption induced in glassby femtosecond laser pulses
I. V. Blonskiia, V. N. Kadana, O. I. Shpotyukb, I. A. Pavlova, N. N. Kryuchkova a Institute of Physics, National Academy of Sciences of Ukraine, Kiev
b Karat Scientific and Production Enterprise, L'vov
Abstract:
The dynamics of the transient light absorption induced in K8 optical glass by filamented femtosecond laser pulses have been studied using time-resolved transmitted-light microscopy at wavelengths from 450 to 700 nm. The transient absorption measured as a function of probe beam wavelength is compared to that predicted by the Drude plasma model. We conclude that, just 450 fs after a pump pulse, the transient absorption is dominated by transient electronic states, presumably, self-trapped excitons, with an excitation energy of 2.6 — 2.7 eV. These states are filled with free-carriers from a long-lived plasma, which acts as a "carrier reservoir". The relaxation of transient absorption has two components. The slow component, with τ1 ~17-17.5 ps, is governed by the plasma thermalisation time, whereas the second, with τ1 ≫ 300 ps, is determined by the plasma lifetime.
Received: 20.01.2009 Revised: 30.06.2009
Citation:
I. V. Blonskii, V. N. Kadan, O. I. Shpotyuk, I. A. Pavlov, N. N. Kryuchkov, “Transient light absorption induced in glassby femtosecond laser pulses”, Kvantovaya Elektronika, 39:10 (2009), 933–937 [Quantum Electron., 39:10 (2009), 933–937]
Linking options:
https://www.mathnet.ru/eng/qe14047 https://www.mathnet.ru/eng/qe/v39/i10/p933
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Abstract page: | 124 | Full-text PDF : | 83 | First page: | 1 |
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