远距离红外与微光/可见光融合成像系统

提出了一种基于查找表的硬件方法,实现了基于l空间色彩传递的图像融合,并以此为基础研制了一种红外热像仪/微光电视/CCD融合成像系统。微光电视和CCD分别在夜间和白天与热像仪融合,构成一全天时的融合成像系统。该系统能够获得近似自然色的图像融合效果,并具有较好的色彩一致性。系统还设计了两种视场,以适应大视场搜索、小视场跟踪的需要;增加了激光测距能力,以满足距离估算的需要。实验结果表明了该系统在导航、监控和目标探测等方面的应用潜力。     

Valkyrie: A CO2laser system for laser fusion experiments

A short-pulse CO2laser system fabricated from commercially available components for laser fusion experimentation is described. Simulation calculations are sketched, amplifier testing is discussed, overall laser system performance is reported, and the requirements for a typical target irradiation experiment are described.     

FSK heterodyne system experiments at 1.5 ?m using a DFB laser transmitter

140 and 70 Mbit/s FSK heterodyne system experiments are reported using single-filter detection with transmitter laser linewidths of 30 and 60 MHz. The system requirements that must be satisfied to avoid large performance penalties are considered.     

用于激光聚变的X射线条纹相机阴极检测系统

研制了一套X射线条纹相机光电阴极检测系统,用于激光惯性约束聚变中阴极的快速标定和检测。通过三位一体的条纹变像管设计,条纹变像管电子光学系统的优化,真空室、控制系统的制备,系统的装调、集成和测试,研制了光电阴极检测系统。组建了阴极系统静态测试平台,标定了其静态特性,测试结果显示:3条条纹像中心的偏移率在狭缝方向为2.8%,在垂直于狭缝方向为6.6%,平均放大倍率1.29,误差在0.8%,边缘空间分辨率大于10 lp/mm。该系统可以满足激光聚变诊断研究对于X射线条纹相机光电阴极的检测需求。     

Travelling-wave laser amplifier experiments at 1.5 ?m

The gain of a 1.5 ?m semiconductor travelling-wave amplifier has been measured with signals in different polarisation states, and the amplifier has been used as a repeater in a phase-modulated coherent system.     

高功率激光系统中内光路热变形的仿真及实验研究

为了研究高功率激光系统中的内光路热变形累积效应对光束质量的影响,开展了理论和实验研究。首先,选择三种非稳腔输出的典型高功率激光,激光功率分别为10 kW、50 kW和100 kW,通过热动力学瞬态方法的有限元分析对激光照射的反射镜进行热变形分析。然后,利用光线追迹理论得到激光的波前像差。最终,激光远场光束质量中的Strehl比,因子可以通过Fresnel衍射积分进行计算和对比分析。仿真结果表明,由于内光路反射镜的热变形,远场光束将出现偏心和像散的现象,其中心光强及会聚能力均会下降。随着内光路反射镜的增加,Strehl比减少而因子增加,远场光斑x方向的倾斜、像散及彗差也会逐渐增加,将成为系统的主要像差。为了和上述理论仿真结果进行对比,建立了一个测量反射镜热变形实验平台,实验中采用10 kW的TEA CO2激光器照射99%反射率的铜反射镜,通过等效放大原理,实验结果可以部分代替50 kW和100 kW功率水平。镜面热变形的测量精度小于/15,并和仿真结果吻合得较好。结果表明,反射镜的热变形在激光功率超过10 kW时不能被忽略,且随着激光功率及反射次数的增加,这种热畸变将变得越发严重。所得结果将对高功率激光系统的热畸变分析过程提供指导,并可应用于激光核聚变及激光武器系统等的设计分析中。     

Axisymmetric angular encoder for laser fusion

We report the demonstration of an angular encoder which produces a discrete conical scan of 25 pulses, each 10 ns in duration. The device is a key optical subsystem for efficient generation of short optical pulses from laser media with short energy storage times. In particular, an encoder of this type may be necessary for use of the rare gas halide laser media in fusion experiments. Our device was also operated as a ring resonator with internal imaging and image rotation. Potential uses, aside from laser fusion, include laser scanning systems and resonator designs in which image rotation is desirable.     

激光助视/微光夜间驾驶仪设计及野外试验

阐述了CY-1C头盔式和电视式激光助视/微光夜间驾驶仪,克服传统微光夜视仪的缺点,利用激光助视弥补了因景物照度和对比度明显下降而影响观察效果的不足,将微光成像系统的探测阈值延伸到10-4 lx以下,并可在不同的恶劣天气条件下观察。对研制的样机在不同夜间环境下的性能进行了野外试验,通过对试验结果的分析和比较,验证了车辆驾驶夜视仪达到了各项预期指标,证实了系统参数设计的合理性。     

基于MPPC阵列探测器的激光测距系统与试验

将4×4多像素光子计数器(MPPC)阵列作为回波 探测器,利用云南天文台升级后的1.2m望远 镜分光路卫星激光测距(SLR)系统,开展了地面漫反射靶和AJISAI卫星的SLR试验。地面靶目 标是60cm的 Al塑板,光程约为45m,用示波器采集单通道输出信号与16通道合并 输出信号,合并输出信号幅值明 显高于单通道输出信号,表明不止一个通道有响应;用事件计时器记录主波、回波时刻并进 行距离解算, 其RMS约为21.7cm,与激光脉冲宽度、漫 反射目标的形状效应引起的测距误差相当。实验结果表明,阵列型探测器较单 元型有一定优势,实验中采用的MPPC阵列探测器进行性能升级后可用于SLR。     

Heterodyne spectroscopy for astrophysical applications using tunable laser sidebands at 10 microns

A heterodyne system was assembled from a microwave tunable sideband laser, a blackbody source, a gas cell, a CdHgTe photomixer and a filterbank. A measurement of line profiles of CH₃F is presented and compared with absorption measurements. System sensitivity is sufficient for high resolution measurement of fine structure lines from astronomical objects, though falling short by a factor of 12, when compared with the most sensitive astronomical heterodyne spectrometers. The usefulness of such a system for astrophysical applications is discussed.     

用于X光激光实验的离轴球面反射镜线聚焦系统的研究

本文对用于X光激光实验的离轴式线聚焦光学系统作了详细的理论与实验研究。该系统已成功地用于“星光Ⅱ”激光装置的X光激光实验研究,取得了良好的结果。     

融合结算分析系统在运营决策中的应用

分析了电信运营企业的结算模式从传统的定性分析向目前的定量分析的转变,以及从传统系统间的信息孤岛向企业数据共享的转变,介绍融合结算分析系统如何为电信运营商"精确化管理、精细化营销"提供数据支撑.     

Compact external cavity diode laser for quantum experiments

We present a compact and practical scheme of building a ~780 nm external cavity diode laser (ECDL) whose wavelength is mainly determined by an interference filter. The Lorentzian linewidth measured by the heterodyne beating between two identical lasers is 60 kHz, and the geometry size of the laser is only 71.5 mm×65 mm×40 mm. The linear cavity design is less sensitive to misalignment induced by mechanical and thermal disturbances, and in comparison to a common grating-based design, the sensitivity to vibration is substantially reduced. Due to its excellent performance, the laser design has already been applied to cold atom trapping experiments. This interference filter ECDL method can also be extended to other wavelengths and widen the application range of diode laser.     

激光多脉冲探测的计算机模拟与实验研究

对激光多脉冲探测理论进行了分析,在考虑了影响探测的各种噪声及其分布特性的基础上,得到了激光多脉冲探测信噪比与脉冲积累次数的定量关系。利用计算机仿真模拟多脉冲探测,其结果与理论分析相符;在实验室条件下对多脉冲探测进行了研究,实验结果表明,在脉冲叠加数较少时,实验与理论符合得很好,当脉冲叠加数较多时,实验数据明显小于理想的数值,分析了出现这种偏差的原因及解决方案。激光多脉冲积累探测可以有效地提高激光探测的信噪比,应用积累探测的方式能有效地将激光探测的弱信号从强噪声背景中检测出来。     

Vulcan--A versatile high-power glass laser for multiuser experiments

This paper reports the design and characterization of the newly upgraded Nd:glass laser facility at the Rutherford Laboratory. Emphasis is placed on the unusual aspects consequent on its role as a multiuser facility, where reliability and flexibility are of paramount importance. The basic facility configuration is of two high-power laser systems in parallel-a six-beam laser for implosion experiments and a separate high-power single beamline for either X-ray backlighting diagnostics of implosion experiments or use in a separate single-beam target area. Additional flexibility is provided by remotely controlled changeover mirrors enabling groups of amplifiers to be used in different combinations for various energies and shot repetition rates. Either a mode-locked or aQ-switched oscillator can be selected to provide a range of pulse durations from 50 ps to many nanoseconds. Harmonic generation is used routinely to give a choice of wavelengths for different experiments. The six-beam system is normally run at the second harmonic, although the fundamental wavelength is also available, while the single-beam target area can use fundamental, second, or third harmonics.     

用于X光激光实验的离轴球面反射镜线聚焦系统的研究

本文对用于Ｘ光激光实验的离轴式线聚焦光学系统作了详细的理论与实验研究。该系统已成功地用于“星光Ⅱ”激光装置的Ｘ光激光实验研究，取得了良好的结果     

水下目标的激光双波段探测技术

研究了一种采用蓝绿波段激光、红外波段激光相结合的水下双波段激光探测技术,分析了红外波段激光击穿水辐射声波应用于水下探测的基本模式、探测特点及声信号的激发机理,实验研究了激光声信号的强度、波形、频谱等特性.实验结果表明,双波段激光复合探测模式可将空中光信道、水中声信道结合起来,具有强大的技术优势;激光声信号应用于水下探测,具有优良的脉冲特性及频谱特征.研究结果有助于推动激光在海洋中的探测应用.     

Compact diffraction grating laser wavemeter for cold atom experiments

We present an innovative and practical scheme of building a miniaturized wavemeter, with the advantages of low cost, high reliability and simple structure. Through a calibration test by a 780 nm external cavity diode laser (ECDL), the results show that our system gets a wavelength resolution of better than 1 pm, measurement accuracy of better than 2 pm (corresponding to a frequency of 1 GHz), and a measurement range of 8.5 nm. Finally, the multi-mode comparison test between our system and a commercial spectrum analyzer further indicates the high-precision, miniaturization and low cost of the proposed system, which shows that it is particularly suitable for ECDL and atom cooling and trapping experiments. The system design, experimental results and conclusions are of definite significance as a fine reference for other ranges of wavelength.