用于激光核聚变的装置CCD光路自动准直

叙述了用近远场光学系统和ＣＣＤ摄像机探测光束位置，微机图象处理技术计算光呸中心偏离误差并调整伺服反射镜，使光束自动恢复到原来位置。     

瞬态同步泵浦锁模腔长负失谐现象的观察

用主被动锁模Nd:YAG倍频脉冲序列作泵浦源,研究了仅有十二次调制的瞬态同步泵浦锁模若丹明激光脉冲的时间特征,着重观察了瞬态同步泵浦锁模染料激光器的腔长负失谐情况,发现腔长负失谐下激光脉冲呈双峰结构,双峰间距和次峰大小均与失谐量成正比。当腔长     

准连续预激光调Q单频激光振荡器的稳定性研究

分析了泵浦过程中谐振腔纵模飘移的物理过程,实验上找到了自动控制谐振腔腔长,从而稳定单频激光输出的参考讯号,实现了100%的长时间的高重复率、准连续单纵模激光运转。 高重复率准连续的工作方式,克服了脉冲工作方式的纵模间竟争时间过短及连续工作方式的严重热效应的缺点,使器件工作十分稳定,脉宽和幅度的起伏均小于5%,单色亮度要比     

准连续主动锁模调QNd:YLF振荡器

顺利建成了用于磷酸盐钕玻璃激光核聚变系统的准连续主动锁模调Q Nd:YLF振荡器。报道了其稳定性、可靠性和高信噪比的特性。     

单纵模固体激光器的物理设计和实验研究

分析了单纵模固体激光振荡器的物理特性,设计了预激光调Q、高重复率工作方式的振荡器,实验上获得了100%的长时间的高功率单纵模激光输出,具有广泛的应用前途。 固体器件要工作在单纵模状态,远比气体器件困难,所遇到的物理问题和技术问题十分复杂。固体器件的工作物质荧光线宽很宽,能级寿命长,腔内存在驻波烧孔效应,又没有稳定频率输出的参考点。我们对这些主要物理问题进行了分析,设计了合理的物理参数,采用了合适的元件,得到了长时间的100%单纵模激光输出。     

多程放大腔镜准直研究

针对高功率激光装置对多程放大器腔镜准直的要求,利用小孔的像传递和光路自动准直的原理,设计出一套创新的腔镜准直调整方法,并且在SG-Ⅲ原型装置4程放大模拟实验平台上进行了实验验证。实验结果表明：自动准直系统能够在15min之内顺利完成主放大级系统的光路调整,光束近场调整精度值小于近场光斑直径的0.5%,光束远场调整精度小于0.3"。     

神光Ⅱ激光核聚变装置激光束自动控制系统研究

激光束自动控制用于SG-Ⅱ装置光束精密瞄准.用傅里叶光学分析可知,探测激光束位置取于空间滤波器像传递面,这样的近远场像面上衍射噪声最小,光束自动调整时,近远场关联又最小,可以各自独立调整.计算机CCD图像处理闭环系统实现了光束自动控制.误差分析和SG-Ⅱ全系统光束自动控制实验表明,光束瞄准精度<4″.(PG12)     

Design and performance of a video-based laser beam automatic alignment system

A laser alignment system is applied to a high power laser facility for inertial confinement fusion. A design of the automated, close-loop laser beam alignment system is described. Its function is to sense beam alignment errors in a laser beam transport system and automatically steer mirrors preceding the sensor location as required to maintain beam alignment. The laser beam is sampled by a sensor package, which uses video cameras to sense pointing and centering errors. The camera outputs are fed to a personal computer, which includes video digitizers and uses image storage and software to sense the centroid of the image. Signals are sent through the computer to a stepper motor controller, which drives stepper motors on mirror mounts preceding the beam sampling location to return the beam alignment to the prescribed condition. Its optical principles and key techniques are given. The pointing and centering sensitivities of the beam alignment sensor package are analyzed. The system has been verified on the     

Design and performance of a video-based laser beam automatic alignment system

A laser alignment system is applied to a high power laser facility for inertial confinement fusion.A designof the automated,close-loop laser beam alignment system is described.Its function is to sense beamalignment errors in a laser beam transport system and automatically steer mirrors preceding the sensorlocation as required to maintain beam alignment.The laser beam is sampled by a sensor package,whichuses video cameras to sense pointing and centering errors.The camera outputs are fed to a personalcomputer,which includes video digitizers and uses image storage and software to sense the centroid of theimage.Signals are sent through the computer to a stepper motor controller,which drives stepper motorson mirror mounts preceding the beam sampling location to return the beam alignment to the prescribedcondition.Its optical principles and key techniques are given.The pointing and centering sensitivities ofthe beam aligmnent sensor package are analyzed.The system has been verified on the multi-pass amplifier experimental system.     

激光核聚变装置中基于像传递的激光自动准直技术研究

基于像传递的激光自动准直技术是提高准直准确度、增加稳定性的好方法。本文在理论上用两快速傅里叶变换（ＦＦＴ）分析了准直中基于像传递的近远场信号对图像处理影响。在光束近无场像面上引入十字叉丝并以“神光”装置的某一级空间滤波器为例,计算出光束直径一定时合适的十字叉丝尺寸;最后通过实验确定了基于像传递的自动直技术的具体实现系统。