Crystal Research and Technology
Cryst. Res. Technol. 38, 874 (2003) - Abstract -

Transmission spectra of crystals at elevated temperatures for the calculation of internal radiant heat transport during crystal growth
Part 2: Spectra of YAG:Cr, YVO4:Nd and the bandgap variation of various materials

A. Polity, D. Schwabe, L. Ackermann*, K. Dupré*

I. Physics Institute, University of Giessen, 35392 Giessen, Germany
*Inst. f. Mineralische und Metallische Werkstoffe, Edelsteine, Edelmetalle (FEE), Idar-Oberstein, Germany

Keywords transmission, radiant heat transport, laser crystals, YAG, YVO4, bandgap shift
PACS 81.40.Tv, 42.70.Hj
DOI 10.1002/crat.200310106

The transmission spectra in the range from 350 to 3500 nm of the two most complex materials with regard to radiant heat transport – YAG:Cr4+ and YVO4:Nd – are reported for temperatures between 25 and 1310°C. The extreme shift of the short wavelength cut-off (band gap) of YVO4:Nd with temperature is shown in comparison to that of some other materials. In YAG:Cr4+ we found a light-induced absorption band near 2000 nm besides a strong reduction of the transmission in the visible and the near IR with increasing temperature.



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