Self-mode-locked unstable resonator copper vapor laser

We have studied a copper vapor laser equipped with unstable resonator optics and an intracavity beam splitter. The magnification of the present resonator configuration is as high as 60, and single transverse mode operation is practically supported in this system. We report on the laser output with near diffraction-limited beam divergence and a new observation of self-mode-locking behavior in the output pulses     

铜蒸气激光器的输出特性与腔长的关系

由于铜蒸气激光器是高增益、短脉冲的激光器件,故改变稳定腔的腔长会使铜蒸气激光的时空特性发生显著的变化,除输出功率随腔长增加而下降这一可以预料的事实外,实验还表明,脉冲波形由非稳态输出光迭加而成,并受腔长周期调制;光束的方向性在某一腔长下有最佳值.     

铜蒸气激光器光束方向性与它所泵浦的染料激光器的效率的关系

实验结果表明,当铜蒸气激光的发散角从8mrad改善到1mrad,它所泵浦的染料激光器的输出功率提高一倍多.这个结果与文中给出的几何光学分析是一致的.由此可见,作为泵浦光源的铜蒸气激光器采用注入锁定非稳腔结构最为合适.     

铜蒸气激光器

以纯铜或铜的卤化物蒸气作激光工作物质,利用高重复频率谐振布鲁林放电线路激励,得到5106(?)和5782(?)激光输出.当充电电容量为1.5毫微法,充电电压6000伏,脉冲重复频率16千赫时,激光平均输出功率为1.2瓦.     

实用化铜蒸气激光器

本文报告一台小型实用化的卤化铜激光器件。对激光器的性能、放电管结构以及高重复率脉冲电源作了介绍。放电管为封离式并有一系列有限制隔离环。激光电源体积小，激光器结构简单，使用方便。     

铜激光光脉冲的时间特性

测量了铜激光两种波长510.6nm和578.2nm光脉冲的抽运时间与氖压和充电电压间的关系。波长578.2nm的光脉冲的抽运时间在不同氖压下随电压的增加而缩短。波长510.6nm光脉冲的抽运时间与电压的关系对氖压较为敏感。     

Effect of preionization of a copper vapor laser

It is shown that the operation of a copper vapor laser (CVL) in exeptionaly lowE/Pis due to preionization. By introducing a wire preionization to a CVL we demonstrate its influence on the laser performance. In a repetitively pulsed CVL a previous pulse can be the preionization source.     

A discharge heated copper vapor laser

A simple, reliable copper vapor laser is described with vapor produced by discharge heating. Average output power of 1.3 W has resulted at 6.8 kHz and a specific energy of 39 μJ/cm³. Copper vapor density as high as3 times 10^{16}cm^-3was achieved.     

高功率铜蒸气激光器的发展

总结了近几年来大口径、高功率铜蒸气激光器实验和理论方面的工作，讨论了高功率铜蒸气激光器结构、大口径铜节气激光器模型和工作物质的重大改进，展望了高功率铜节气激光器实验及理论方面的进展及可行性方案。     

Copper vapor laser unstable resonator oscillator and oscillator-amplifier characteristics

We have studied the properties of copper vapor lasers configured as oscillators with unstable resonator optics and as power amplifiers. With the unstable resonator, a 26-fold reduction in the oscillator beam divergence has been achieved over the value observed with stable optics without any power degradation. Time-dependent beam divergence effects in the unstable resonator have also been measured and explained. Small-signal gain, saturation fluence, and available stored energy density parameters have also been measured in oscillator amplifier experiments for both the 510.6 and 578.2 nm transitions as a function of the copper number density. These results quantify the maximum power per unit length available from these devices and furthermore, demonstrate efficient extraction of power from copper vapor lasers operated as amplifiers.     

Multi-active region laser diode with a narrow beam divergence angle

A novel large optical cavity laser diode, which consists of multi-active regions cascaded together through tunnel junctions, is proposed. After growing the epi-layers with LP-MOCVD system on GaAs substrate, the ridge waveguide laser structure is fabricated, and it shows a transverse divergence angle as low as 14.4°. This work was supported by special foundations for major state basic research project of China(G20000683-02)     

铜蒸气激光器的热设计

本文系统阐述了铜蒸气激光器的设计过程.在大量实验资料的基础上,给出了激光器放电管尺寸、输入功率密度的选择原则,通过分析放电管内气体温度分布、激光管径向热导损耗,建立了一套确定保温层厚度的方法.分析了光束"黑心"的原因,进而提出了解决途径.以上的设计思想在我们新近研制5W器件上得到验证.     

A copper laser using CuI vapor

A simple CuI double-pulsed laser was built. The dependence of power output on the delay between the two excitation pulses, temperature, and the type of buffer gas has been investigated. The laser pulse duration was measured.     

Single-quantum-well laser with 11.2 degree transverse beam divergence

The authors report the operation of a single-quantum-well laser vertically integrated with four passive waveguides to achieve a record low beam divergence of 11.2 degrees . While the beam divergence is reduced by a factor of four when compared with a single-quantum-well laser, the threshold current increases by a factor of three. Analysis shows that it is possible to reduce the threshold current further while maintaining the same low beam divergence.<>     

光束发散角对星载激光测高仪森林回波的影响

植被树高是生物量评估和森林生态监测的重要参数,但是大区域的植被树高数据获取困难.由大光斑星载激光测高系统森林回波可反演大区域植被树高,然而大坡度山区的植被和地面回波混叠严重,难以准确提取波形参数反演植被树高.为此建立森林目标回波的解析模型,推导出从混叠回波中分离植被和地面回波的必要条件,指出导致回波混叠的因素除了目标粗糙度和坡度,还有发射脉冲的发散角.分析了地表粗糙度和地形坡度对植被冠层回波的展宽效应及其对波形分解的影响,通过比较实测GLAS波形和仿真回波波形,验证了压缩光束发散角可降低森林回波对大坡度地形的敏感性.对于卫星轨道高度在500~600 km之间时,激光测高仪光束发散角一般在40~60μrad,更有利于森林植被树高的反演.所得结论为提高大坡度山地森林树高反演精度,从星载激光测高仪的系统设计角度提供了有意义的参考.     

Transverse-discharge copper vapor laser at 5 kHz

The results of a preliminary measurement of the performance parameters for a transverse-discharge copper vapor laser that was successfully operated at 5 kHz in steady-state mode are discussed. In unoptimized operation, an average power of 1.8 W was obtained at 5 kHz in steady-state mode with an efficiency of 0.48%. The power output increases almost linearly with the repetition rate. This demonstrates that it is now possible to develop discharge-heated transverse-discharge copper-vapor lasers for practical applications     

铜蒸气激光放大器的数值模拟

本文建立了一个铜蒸气激光放大器的简化动力学模型,数值计算了铜蒸气激光放大器的增益特性、同步特性、损耗对放大器输出功率的影响以及延时与输出光波形畸变量的关系等。计算结果与实验结果基本相符。     

20W放电自加热式铜蒸气激光器

本文报道了平均输出功率为21.5W、效率为0.5％的铜蒸气激光器。测量和分析了该器件的发光性能。     

望远镜非稳腔光束发散角的测量与结果分析

灯泵望远镜非稳腔巨脉冲YAG激光器的远场光束发散角被精确测量,该非稳腔采用硬边输出镜,其输出平行光束,经过一长焦距的凹面镜,聚焦衰减后照射到CCD上,拍摄到焦平面的光斑像。在计算机中用图像处理方法求出光斑的大小,再计算发敞角。     

电子束的发散性对自由电子激光器输出性能的影响

研究表明,进入Wiggler场的相对论电子束的发散角增大,将降低自由电子激光器的增益,但小量的发散角可提高激光器的输出功率。最大容许的发散角由激光振荡条件决定。