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4 November 2010 THz-infra-UV transmission spectra of BGO:Ca/Pb crystals
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The THz-Infra-UV transmission spectra of Bi4Ge3O12 (BGO) and BGO:Ca, BGO:Pb crystals have been measured at the room temperature. The forbidden gap Eg of electronic energy bands are about 3.66eV (339nm). The quantities of adulteration Ca2+ and Pb2+ were very little (0.02 wt %), it did not influence Eg and the breadth of phonon absorption. The high frequency edge of the phonon absorption of the crystals was at 1700cm-1 (or 51THz). The low frequency edge of the phonon absorption was at 66 cm-1 (or 1.98THz). Below 2.00THz the transmission T(1/λ) largened, maybe a nice transmission would be below 2.00THz in the three samples. The influence to the transmission from impurity Ca2+ ion was smaller than 10%, and from impurity Pb2+ion was smaller than 5%. Below 2.00THz the transmission T(1/λ) largened in the three samples.
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Bihui Hou, Na Li, Wei Hao, Ya-li Wang, Bingxin Yang, and Renbin Zhong "THz-infra-UV transmission spectra of BGO:Ca/Pb crystals", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 785405 (4 November 2010);

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