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http://dx.doi.org/10.4191/KCERS.2002.39.8.795

Crystal Growth of Yb:YCa4O(BO3)3 and Investigation of Spectroscopic and Thermal Properties  

Kim, Choong-Ryeul (Korea Photonics Technology Institute)
Lee, Hyeon-Jun (Department of Physics, Pusan National University)
Yu, Young-Moon (Korea Photonics Technology Institute)
Publication Information
Journal of the Korean Ceramic Society / v.39, no.8, 2002 , pp. 795-800 More about this Journal
Abstract
Yb:$YCa_4O(BO_3)_3$ (Yb:YCOB) single crystal, in which the concentration of $Yb^{3+}$ ion 20 at%, was grown by the Czocharalski method using an iridium crucible under N2 atmosphere. The optimum growth parameters to get a high quality of single crystals were found to be 1.5∼2 mm/h of pulling rate and 10∼20 rpm of rotation rate. According to the results of spectroscopic properties, absorption edge of Yb:YCOB was 236 nm. Two strong absorption line due to $Yb^{3+}$ ions were observed at 900 and 975 nm. Thermal expansion coefficients of Yb:YCOB crystal along a, b and c crystallographic axes from 320 to 650 K were 12.1${\times}10^{-6}$/K, 5.9${\times}10^{-6}$/K, 12.9${\times}10^{-6}$/K, respectively. Specific heat was 0.162 $cal/g{\cdot}K$ at 330 K.
Keywords
$Yb:YCa_4O(BO_3)_3$; Single crystal; Czochralski method; Thermal expansion coefficient; Specific heat;
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