姿态误差对机载激光多普勒三维速度测量精度的影响

激光多普勒测速系统可实现空中运动平台的速度测量,平台的姿态测量误差是影响其测速精度的重要因素。为实现运动平台三维速度的测量,以相干探测原理为基础,设计并搭建了全光纤三光束激光多普勒测速系统,建立了运动平台三维速度测量的数学物理模型,对系统测速相对误差进行了数值模拟研究。研究结果表明,姿态测量误差对测速精度的影响不可忽略;随着俯仰角度的不同,俯仰误差与旋转误差对测速精度的影响程度会发生变化;测速精度与旋转误差呈线性关系,而与俯仰误差存在着非线性关系。研究结果可为激光多普勒测速系统的设计以及速度修正提供理论依据。     

ANSYS在脉冲CO_2激光对K9玻璃损伤过程模拟中的应用研究

从脉冲CO2激光损伤K9玻璃有限元模型的建立和网格划分、脉冲激光的加载、设置初始条件和边界条件等几个方面,分析了基于ANSYS的脉冲CO2激光损伤K9玻璃模拟过程中的一些关键问题,建立了脉冲CO2激光损伤K9玻璃的有限元模型,对K9玻璃受到脉冲CO2激光辐照时的温度和应力分布进行了数值分析.     

印刷电路板预电离小TEACO2激光器两种照射模式研究

通过使用印刷电路板预电离小TEACO2激光器,研究了预电离过程中两种照射模式-照射阳极模式和照射阴极模式下,激光器注入能量和输出能量的关系,实验得出,在印刷电路板预电离小TEACO2激光器中,两种照射模式的注入与输出曲线基本吻合,而照射阳极模式下印刷电路板预电离小TEACO2激光器更具有潜力。     

超快荧光光谱的光谱特性和时间特性的研究

飞秒脉冲激光器和时间分辨率优于 2ps的条纹相机相结合测量超快荧光光谱的光谱特性和时间特性 ,分析了荧光光谱的产生 ,给出了时间分辨荧光光谱的测量 ;实际测量了一种有机光盘存储记录材料偶氮染料掺杂薄膜的时间分辨荧光光谱和荧光寿命。     

Nanoshuttered OLEDs: Unveiled Invisible Auxiliary Electrode

In this study, organic light‐emitting diodes (OLEDs) with enhanced optical properties are fabricated by inserting a nanosized stripe auxiliary electrode layer (nSAEL) between the substrate and an indium tin oxide (ITO) layer. This design can avoid the shortcomings of conventional microsized layers while maintaining high optical uniformity due to the improved conductivity of the electrode. The primary advantage is that the nSAEL (submicrometer scale) is no longer visible to the naked eye. Moreover, the reflective shuttered (grating) structure of the nSAEL increases the forward‐directed light by the microcavity (MC) effect and minimizes the loss of light by the extracting the surface plasmon polariton (SPP) mode. In this study, the degree of the MC and SPP can be controlled with the parameters of the nSAEL by simply conjugating the conditions of laser interference lithography (LIL). Therefore, the current and power efficiencies of the device with an nSAEL with optimized parameters are 1.17 and 1.23 times higher than the reference device at 1000 cd/m², respectively, and at these parameters, the overall sheet resistance is reduced to less than half (48%). All of the processes are verified by comparing the computational simulation results and the experimental results obtained with the actual fabricated device.     

离子注入和脉冲激光退火制备碲超饱和掺杂单晶硅pn结

Pn junctions based on single crystalline tellurium supersaturated silicon were formed by ion implantation followed by pulsed laser melting（PLM）.P type silicon wafers were implanted with 245 keV ¹²⁶Te⁺ to a dose of 2×10¹⁵ ions/cm²,after a PLM process（248 nm,laser fluence of 0.30 and 0.35 J/cm²,1-5 pulses,duration 30 ns）,an n⁺ type single crystalline tellurium supersaturated silicon layer with high carrier density(highest concentration 4.10×10¹⁹ cm^-3,three orders of magnitude larger than the solid solution limit) was formed,it shows high broadband optical absorption from 400 to 2500 nm.Current-voltage measurements were performed on these diodes under dark and one standard sun（AM 1.5）,and good rectification characteristics were observed.For present results,the samples with 4-5 pulses PLM are best.     

高能激光能量计吸收腔的温度特性

为了提高高能激光能量测量的精确度,减小不准确度,给出了一种吸收腔结构,对基于量热法的吸收腔的内、外壁温度差特性进行了理论研究和实验验证。用一维非线性傅里叶热传导方程分别建立了吸收腔在激光加热过程中和加热结束后的温度分布。利用模拟实验对激光照射吸收腔的过程进行模拟,得到内、外壁温度差的实验数据。利用ANSYS软件,根据激光加热的原理,建立了仿真模型,并用模型对理论分析结果作数值仿真。理论分析结果与实验数据非常接近。在激光照射过程中,虽然吸收腔内、外壁存在渐趋固定的温度差,但当照射结束后,该温差迅速减小,吸收腔到达平衡。     

具有自动增益控制的零盲距半导体激光测距仪

文中从分析近距反射光强与距离之间关系入手,提出了一种自动增益控制电路。该动增益控制电路可根据反射信号幅度大小自动调节光电放大器的增益,使光电放大器输出的信号幅度稳定在一定范围内,从而降低了近距离因光电放大器输出信号幅度变化过大,甚至饱和失真而引起的测距误差,提高了近距测量精度,大大降低了近距盲距。     

激光制导导引头解码脉冲宽度的研究

就激光半主动制导武器（激光导引头）接收系统的解码脉冲的宽度进行了理论研究,讨论了选取不同的解码脉冲宽度对激光导引头制导效果的影响．提出了为对抗角度欺骗式激光干扰和高重频有源激光干扰,导引头接收解码脉冲宽度必须正确设计的重要性。     

声光调Q全固态绿激光器中的双控驱动电路

研制出新型双控声光驱动器,能够同步控制声光Q开关和LD抽运源的工作时间,并具有10W以上的输出功率及15ns(1个声光驱动射频周期)内的调Q开关时间.应用该驱动器的全固态调Q绿光激光器的能耗减少50%以上,温升减少10℃以上,热稳定时间减少到22%,用1W的LD抽运,得到了脉宽14.5ns、峰值功率lkW的无寄生脉冲绿激光输出.