Study of optical properties of PLZT ceramics by laser calorimetry

Maris Knite

doi:10.1117/12.347652

7 May 1999 Study of optical properties of PLZT ceramics by laser calorimetry

Maris Knite

Proceedings Volume 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications; (1999) https://doi.org/10.1117/12.347652
Event: 10th International School on Quantum Electronics: Lasers: Physics and Applications, 1998, Varna, Bulgaria

Abstract

The values of absorption coefficient of PLZT ceramics at selected wavelengths in the 0.478 - 1.06 micron interval and at 5.56 microns have been obtained by laser calorimetric measurements. Continuous spectrum of extinction in the 0.37 - 6.5 micron interval has been measured by a spectrometer. The values of scattering coefficient were obtained by subtraction the experimentally measured absorption from the extinction. The values of scattering coefficient at (lambda) < 0.478 micrometers were calculated on the grounds of Usov- Shermergor theory of light scattering in ferroelectric ceramics and were used to obtain the values of the absorption coefficient in the shortwave end of the spectrum. Absorption coefficient was found to follow exponential law with fracture point at hv equals 3 eV and two characteristic (Urbach) energies (Delta) E₁ equals 106 meV and (Delta) E₂ equals 238 meV. Results are explained by high concentrations of two kinds of defects: Pb vacancies and Ti vacancies being responsible for deep acceptor levels in the energy gap. The concentration of Pb vacancies estimated by the Bonch-Bruyevich random field model has been found to exceed the concentration of Ti vacancies by a factor of 7.6.

Citation Download Citation

Maris Knite "Study of optical properties of PLZT ceramics by laser calorimetry", Proc. SPIE 3571, Tenth International School on Quantum Electronics: Laser Physics and Applications, (7 May 1999); https://doi.org/10.1117/12.347652

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