Control of high-order harmonic generation with two-colour laser field

We numerically investigate the high-order harmonic generation with two-colour optical field,taking into considera-tion the propagation effects.Some harmonics can be dramatically enhanced at a certain delay between the fundamental pulse and its second harmonics.Choice of the enhanced harmonics can be realised by changing the time delay between the two laser pulses.     

新型光电子材料氧化钒

介绍了一种新型的光电子材料——氧化钒.在不同的温度下氧化钒可以在半导体-金属-绝缘体之间可逆转变,并且伴随相变的发生,该材料的光电特性也随之发生变化,在非制冷红外探测器和智能激光防护方面有着广泛的应用前景.     

Self-compression of femtosecond pulses in argon with a power close to the self-focusing threshold

Self-compression of femtosecond pulses in noble gases with an input power close to the self-focusing threshold has been investigated experimentally and theoretically. It is demonstrated that either multiphoton ionization （MPI） or space-time focusing and self-steepening effects can induce pulse shortening, but they predominate at different beam intensities during the propagation. The latter effects play a key role in the final pulse self-compression. By choosing an appropriate focusing parameter, action distance of the space-time focusing and self-steepening effects can be lengthened, which can promote a shock pulse structure with a duration as short as two optical cycles. It is also found that, for our calculation cases in which an input pulse power is close to the self-focusing threshold, either group velocity dispersion （GVD） or multiphoton absorption （MPA） has a negligible influence on pulse characteristics in the propagation process.     

基于STC12C5410AD的太阳能路灯控制器设计

介绍了以单片机为核心的太阳能路灯控制器的设计,对系统的硬件和软件设计做了说明.系统以较少的按键实现了参数设置,采用PWM技术对蓄电池进行充电管理,采取了负载过流、短路保护措施.系统具有可靠性高、操作简单等特点.     

基于纳米/微米VO2红外探测器光电响应对比研究

新型纳米结构的二氧化钒(VO2)热敏薄膜具有平均粒度为8 nm和在半导体相区电阻温度系数(TCR)为-6%～7%/K.而通常用于非致冷红外探测器的VO2具有微米结构,粒度为1～2μm、TCR约为-2%/K.采用同样的器件设计,制备了基于纳米结构和微米结构的VO2薄膜128元线列器件,并对两种器件的光电性能进行了对比研究.测试结果表明:基于纳米结构VO2的器件响应率较基于微米结构的VO2器件高近3倍,前者器件的探测性能较后者得到了明显的改善.