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

The transmission spectra in the range from 350 to 3500 nm of the two most complex materials with regard to radiant heat transport – YAG:Cr+4 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...

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Veröffentlicht in:	Crystal research and technology (1979) 2003-10, Vol.38 (10), p.874-880
Hauptverfasser:	Polity, A., Schwabe, D., Ackermann, L., Dupré, K.
Format:	Artikel
Sprache:	eng
Schlagworte:	bandgap shift Cross-disciplinary physics: materials science rheology Exact sciences and technology Growth from melts zone melting and refining Infrared spectrometers, auxiliary equipment and techniques Infrared, submillimeter wave, microwave and radiowave instruments, equipment and techniques Instruments, apparatus, components and techniques common to several branches of physics and astronomy laser crystals Materials science Methods of crystal growth physics of crystal growth Optical instruments, equipment and techniques Physics radiant heat transport transmission Visible and ultraviolet spectrometers YAG YVO4
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Zusammenfassung:	The transmission spectra in the range from 350 to 3500 nm of the two most complex materials with regard to radiant heat transport – YAG:Cr+4 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. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
ISSN:	0232-1300 1521-4079
DOI:	10.1002/crat.200310106