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

1.阵列光源的设计与制作我们提出了一种阵列光源，该光源以重复频率为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1THz的光学脉冲。光程长度调节器的设计是为了在较宽的重复频率范围内将输出脉冲均匀地分配在来自激光器的脉冲之间。该单元由两个矩形等边棱柱和一个模块组成。讨论了用于该模块的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每个透镜的焦距和尺寸。利用光致聚合物制作了全息透镜，获得了65%的最大衍射效率。在超快图像读出中的应用初步实验表明，超高重复频率光脉冲的产生。用光折变晶体记录了全息图，并用阵列光源的光束照射全息图，确认产生了规则间隔为11.7ps的脉冲。这些结果表明了其应用于超高速图像读出的可行性。在超高速光通信中的应用讨论了利用双位相共轭反射镜将阵列光源的输出脉冲耦合到单模光纤中的方法。通过这种技术，所有脉冲都可以耦合到光纤中，而不需要任何调整。讨论了其在超高速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.