<title>Optical absorption in Bi<formula><inf><roman>2</roman></inf></formula>TeO<formula><inf><roman>5</roman></inf></formula> single crystals</title>

• DOI: 10.1117/12.239218
• Publication Date: 2004-10-06T22:56:48Z
• Authors: L. J. Sadovskaya; K. V. Agarkov; A. Y. Kudzin; G. K. Sokolyanskii; V. V. Eliseyev
• Keywords: Absorption edge; Bismuth

Spectral dependences of optical absorption coefficient the bismuth tellurite single crystals grown by Chohralsky method have been observed. The investigations were carried out on fresh-prepared samples different thickness after annealing up to 400 degrees Celsius in air and vacuum also illumination intensive light with various wavelengths. value forbidden band for indirect transition (E<SUB>gi</SUB>) is approximately 3.11 eV at room temperature it decreases about 10<SUP>-3</SUP>eV multiplied K<SUP>-1</SUP>. On spectra sample broad bands observed region fundamental edge longwave (hv equals 1.5 - 1.9 eV). Photochromic effect was found Bi<SUB>2</SUB>TeO<SUB>5</SUB>. nature photochromic analyzed.