期刊
SOLID STATE SCIENCES
卷 11, 期 4, 页码 841-844出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solidstatesciences.2009.01.003
关键词
Nonlinear optical crystal; K2Al2B2O7; Iron impurity; UV absorption
资金
- National Natural Science Foundation of China [60578028]
K2Al2B2O7 (KABO) is a new nonlinear optical crystal capable of laser harmonic generation in the UV range. However, abnormal UV absorption prevents its application in effectively generating UV light with wavelength shorter than 300 nm. The transmittance spectra of the grown crystals show distinct absorption bands at 216 nm and 264 nm. It is observed that the UV absorption is Strongly Correlated with iron impurity at a parts per million (ppm) level. Furthermore, electron paramagnetic resonance (EPR) spectra of the absorbing crystals show a strong signal at g = 2.00 position corresponding to a Fe3+ center. A new crystal growth method which reduces the iron content has been proposed and results show that the new KABO crystal is free from the Fe3+ UV absorptions. (C) 2009 Elsevier Masson SAS. All rights reserved.
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