【作者】 祖宏业；

【导师】 于丽；

【作者基本信息】 北京邮电大学 ， 光学， 2006， 硕士

【摘要】 随着超快激光技术的出现和飞速发展，许多研究领域对具有极高峰值功率，极窄脉冲宽度的飞秒光脉冲光源的需求日益增加，Cr^4r∶YAG激光器以其独特的谱线发射范围（1.3～1.6um）和具备支持飞秒量级超短脉冲的增益谱宽而倍受关注。本文对用于量子通信的飞秒激光器进行了理论与实验分析。第一章简单介绍了超短脉冲激光器的发展背景及在量子通信方面的应用。第二章对超短脉冲的锁模技术进行讨论，介绍了主动锁模、被动锁模、同步泵浦锁模、碰撞锁模，以及20世纪90年代出现的加成脉冲锁模或耦合腔锁模、自锁模等，锁模技术是产生超短脉冲的关键技术。第三章论述了在Cr⁴⁺∶YAG激光器中，用熔融的石英材料制成的棱镜对作为色散补偿元件的一些理论计算和色散分析，得出棱镜对不但可以实现二阶色散的完全补偿，同时三阶色散也可以得到一定的补偿，从而使脉冲宽度得到进一步压缩。第四章先分析了Cr^4r∶YAG晶体的光谱特性、能级结构、速率方程；然后讨论了超短脉冲测量的方法，包括自相关测量的原理与应用及频率分辨光学开关法等测量方法。第五章对我们实验室所采用的激光器光路从光束匹配及激光腔的稳定性两个角度进行分析。由于Cr⁴⁺∶YAG晶体的端面呈布儒斯特角切割，从而产生了像散，为了保证谐振腔内高斯模为圆斑，我们采用像散补偿的Z型四镜折叠腔，并详细讨论了各种参数对光路稳定性的影响。更多还原

【Abstract】 In the dissertation, the Cr⁴⁺:YAG laser which can be used in the quantum communication is researched by the theory and experiment . In chapter one, we discuss the background and development of ultra-short pulse laser and its applications in quantum communications. In chapter two, the mode locking theory is discussed. We introduce the initiatively mode-locking, passively mode-locking, synchronization mode-locking and self mode-locking, etc. The mode-locking technology is very important in the producing the ultra-short pulse. In the chapter three, the cause of producing dispersion and theory of dispersion compensation by prism pair in our Cr⁴⁺:YAG laser are studied. We find that the second order dispersion can be completely compensated by prism pair and the third order dispersion can be partially compensated. So the width of pulse can be more compressed. In the chapter four, we study the Cr⁴⁺:YAG crystal and the measure of ultra-short pulse. Firstly, we talk about the characteristic of Cr⁴⁺:YAG crystal ,rate equation and structure of energy bands. Then we discuss the development of measure technology. In the更多还原