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中文摘要：
本文应用吸收光谱法，对提拉法生长的Nd，Cr：GSGG晶体在不同气氛下退火后的光谱变化进行了研究。氧化气氛下退火后的吸收光谱中，在1μm处出现了由于晶体中存在Cr^4＋离子所引起的两个吸收带，被称为1μm吸收损失。还原气氛（CO和H2）下退火后的吸收光谱中，在1μm处的吸收带基本消失，这对于提高激光效率是非常有利的。此外，在642nm处的吸收带强度有一定的减弱。这些数据对于晶体后处理工艺的改进和激光器设计具有重要的参考价值。
英文摘要：
By using optical absorption method, we studied the absorption spectra change of Nd, Cr：GSGG crystal grown by CZ method and annealed in different atmospheres. The results indicated that after the Nd, Cr： GSGG crystal was annealed in the oxidation atmosphere, the absorption spectrum exist two absorption bands near 1μm due to some Cr^4＋ ions in the crystal, which are called 1μm absorption loss. After the Nd, Cr ： GSGG crystal was annealed in reducing atmosphere, the absorption bands near 1μm almost disappear fully, which is very helpful to improve the laser efficiency. In addition, the absorption band intensity near 642nm became weak. These data will provide an important reference for the improvement of crystal subsequent treatment processing and the laser design.
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