GENERATION OF ULTRAHIGH-REPETITION-RATE AND ULTRASHORT OPTICALPULSE USING ARRAY ILLUMINATOR AND ITS APPLICATIONS

1.阵列照明器的设计与制作我们提出了一种以重复频率为82 MHz、脉宽为3.5ps的锁模Nd：YAG激光器为光源，产生重复频率高达1 THz的光脉冲的阵列照明器。设计了光路长度调节器，使输出脉冲在激光器输出的脉冲之间均匀分布，以获得宽重复频率范围。该单元由两个矩形等边棱柱和一个模块组成。讨论了微透镜阵列和全息透镜阵列，并利用光线矩阵和复光束参数计算了各透镜的焦距和尺寸。采用光致聚合物制作了全息透镜，最大衍射效率为65%.在超快图像读出中的应用进行了超高重复率光脉冲产生的初步实验。用光折变晶体记录全息图，用阵列照明器的光束照射全息图，证实产生了间隔为11.7ps的规则脉冲。这些结果表明了其应用于超快图像读出的可行性。3.在超快光通信中的应用讨论了利用双相位共轭镜将阵列照明器输出的光脉冲耦合到单模光纤中的方法。所有的脉冲都可以耦合到光纤中，而不需要通过这种技术进行任何调整。讨论了它在超快光通信中应用的可行性。

1. Design and fabrication of array illuminatorWe proposed an array illuminator generating optical pukes with repetition rate up to 1THz using an mode-locked Nd : YAG laser with repetition rate of 82MHz and pulse width of 3.5ps as a light source. The adjuster of optical path length was designed to distribute the output pulses uniformly between the pulses from the laser for wide range of repetition rate. This element consists of two rectangular equilateral prisms and a module. A micro lens array and holographic lens array were discussed for this module and the focal length and the size of each lens were calculated using ray matrix and complex beam parameter. The holographic lenses were fabricated using photopolymer and maximum diffraction efficiency of 65% was obtained.2. Application to ultrafast readout of imagesThe preliminary experiments to show the generation of ultrahigh-repetition-rate optical pulse were carried out. The hologram was recorded using photorefractive crystal and the generation of pulses with regular interval of 11.7ps was confirmed by illuminated the hologram with the beams from the array illuminator. These results show the feasibility of its application to ultrafast readout of images.3. Application to ultrafast optical communicationThe methods for coupling the output pulses from the array illuminator into a single mode fiber using double phase-conjugate mirror were discussed. All pulses can be coupled into the fiber without any adjustment by this technique. The feasibility of its application to ultrafast optical communication are discussed.