论文部分内容阅读
利用准速度匹配技术可以实现大调制度的电光相位调制器,从而可以用来展宽激光频谱,它在光谱学、激光变频以及改善激光均匀性等方面有重要应用。当大功率激光通过调制器时,要求晶体的通光面积越大越好,所以大面积并且具有较大厚度的铁电晶体的室温极化技术成为准速度匹配实现的关键技术。详细研究了大面积并且厚度达到1 mm的钽酸锂晶体的电场室温极化过程,针对在极化过程中外部施加高电压时产生的回流现象,采用了改变极化时间来抑制,取得了较好的效果。利用热释电和化学腐蚀方法,成功地实现了钽酸锂晶体的大面积畴反转。该种技术同样可以用于其他大面积铁电晶体的极化。
The use of quasi-velocity matching technology can achieve a large degree of electro-optic phase modulator, which can be used to broaden the laser spectrum, which has important applications in spectroscopy, laser frequency conversion and to improve the uniformity of the laser. When the high-power laser passes through the modulator, it is required that the larger the light passing area of the crystal is, the larger the room temperature polarization technology of a ferroelectric crystal with a large area and a large thickness becomes a key technology for quasi-speed matching. The polarization process at room temperature of lithium tantalate crystals with large area and thickness up to 1 mm has been studied in detail. For the reflow phenomenon caused by the external application of high voltage during the polarization process, the polarization time is used to suppress the polarization. Good results. Large-area domain inversion of lithium tantalate crystals has been successfully achieved by pyroelectric and chemical etching methods. The same technique can be used for the polarization of other large-area ferroelectric crystals.