Pulse Shaping Systems for Femto-second Laser Pulses

为了将具有光折变多量子阱结构的衍射光学器件用于脉冲整形和控制系统，研究了这些器件，这是由于傅立叶域的光波合成过程。结果表明，光折变多量子阱器件是系统中有用且有效的元件。所制备的光折变多量子阱器件由多种独立的阱结构组成。由于每种结构分别表现出不同的激子吸收共振波长，因此扩大了净共振波长范围。得到的有效波长范围为820 ~ 830nm。提出了一种新的光学系统，使我们能够在没有任何移动反射镜系统的情况下计算两个飞秒激光脉冲之间的相关性，并进行了计算机仿真研究。该系统包含用于傅里叶域图像转换器的光折变多量子阱器件。在本项目中，我们无法实际完成光折变多量子阱器件的脉冲整形和控制系统。但是，由于该项目利用光折变多量子阱开发了关键器件之一的空间光调制器，因此该系统将很快可用。

Diffractive optical devices with photorefractive multiple quantum well structure have been investigated in order to use these devices for pulse shaping and controlling system, which is due to the optical wave synthesis procedure in Fourier domain. It was shown that the photorefractive multiple quantum well devices are useful and effective elements in the system.The fabricated photorefractive multiple quantum well device consists of some kinds of separate well structure. Because each structure exhibits different resonant wavelength for exciton absorption, respectively, the net resonant wavelength range is broaden. The resultant range of the effective optical wave length is 820-830 nm.New optical system, which enable us to calculate the correlation between two femto-second laser pulses without any moving mirror system, is proposed and has been investigated by computer simulation.The proposed system contains the photorefractive multiple quantum well device for image converter in Fourier domain.In this project, we can't finish the pulse shaping and controlling system with the fabricated photorefractive multiple quantum well device, practically. However, the system will be available soon, because one of the key device, the spatial light modulator, is developed with the photorefractive multiple quantum well in this project.