Junaid, Bushiri M; Mahadevan Pillai, V P; Ratheesh, R; Nayar, V U(Elsevier, April 23, 1999)
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Abstract:
Raman spectra of the KTP single crystal are recorded in electric fields (dc and ac) applied along the polar axis c. Spectra with
the laser beam focused near the cathode end, anode end and the centre of the crystal are recorded. The cathode end of the crystal
develops a spot ‘grey track’ where the laser beam is focused after a lapse of 5 h from the application of a dc electric field of
38 V/cm. The spectra recorded at the cathode end after the application of field show variations in intensity of bands. A new band
appears at 177 cm21. Changes in band intensities are explained on the basis of changes in polarizability of the crystal due to the
movement of K1 ions along the polar axis. K1 ions accumulate at the cathode end, where the ‘Grey track’ formation occurs.
The intensity enhancement observed for almost all bands in the ac field is attributed to the improvement of crystalline quality.
Description:
Journal of Physics and Chemistry of Solids 60 (1999) 1983–1988