โ Scribed by H. Rager; M. Taran; V. Khomenko
No coin nor oath required. For personal study only.
Polarized optical absorption measurements were carried out on three single crystals of Mg2SiO 4 (forsterite), differently doped with Cr. Two crystals containing average 0.013 and 0.027 weight% Cr, respectively, were pulled from the melt in air, whereas one crystal containing average 0.08 weight% Cr was pulled from the melt in an argon atmosphere. The absorption spectra of the three crystals agree with each other although the intensity of single absorption bands varies significantly. In all 7-polarized patterns a sharp absorption line around 18 000 cm-x (550 rim) appears. Conjectures are presented to assign this line to the lasing center in Cr doped forsterite which very likely exists as Cr a+ at the fourfold coordinated Si site.
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