以下为句子列表：
英文: The basic principle and characteristics of optical frequency conversion technology based on the photonic crystals are firstly summarized in the paper; then, the current developments of frequency conversion of photonic crystals are also presented; finally,
中文: 摘要文章首先介绍了光子晶体光学频率变换技术的基本原理和技术特点；然后简述光子晶体光学频率变换技术研究进展情况；最后指出了光子晶体变频技术在可调谐激光器和其它领域中的应用前景。
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