Light absorption in mono- and polycrystalline YAG:Nd samples under pulsed electron irradiation
| Autor: | V. D. Kulikov, R. V. Emlin, V. A. Shitov, V. Yu. Yakovlev, R. N. Maksimov |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Applied Mathematics General Engineering Electron Nanosecond Molecular physics Atomic and Molecular Physics and Optics Monocrystalline silicon Computational Mathematics Atomic electron transition Electron beam processing Irradiation Crystallite Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Optical Technology. 87:318 |
| ISSN: | 1070-9762 |
| DOI: | 10.1364/jot.87.000318 |
| Popis: | We studied the onset of induced optical absorption in mono- and polycrystalline Y3Al5O12:Nd3+ samples upon irradiation by a nanosecond electron beam with electron energy of 250 keV and current density of 25A/cm2. We show that in such crystalline samples, the fast electrons produce induced absorption between 1 and 4.2 eV expressed as a superposition of six adjacent elementary lines. We found that the induced absorption is due to electron transitions from the valence band to a local level around an O−–hole center, while the initial-phase (10−7−10−4s) relaxation of the induced absorption is determined by quadratic recombination of conduction-band electrons with the O−–hole centers. The higher density of structural defects in the polycrystalline sample than the monocrystalline sample increases the band-electron lifetime against capture by O− centers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|