100W铜蒸气激光器

报告了高功率铜蒸气激光器研究的最新进展，给出了我们最近研制成的国内可见波段输出功率最大的１００Ｗ铜蒸气激光器的一些主要技术参数。     

大口径铜蒸气激光器的研究

研制成一台输出功率为百瓦级的铜蒸气激光器，其放电管长度为２２０ｃｍ，内径为６．５ｃｍ，脉冲重复频率为５ｋＨｚ，最大输出功率为１０６Ｗ，效率为１％。给出了激光输出功率与放电参数的关系，通过与小口径（Ｄ＜６ｃｍ）放电铜蒸气激光器比较，阐述了大口径铜蒸气激光器的一些物理特性     

用双闸流管运行的高功率铜蒸气激光器电源的研究

介绍了采用双闸流管作主放电开关的高功率铜蒸气激光器电源的原理、实验和结果。输入电源的功率达到10kW，输出激光平均功率最高达到100W，国产闸流管可以有效、正常地工作。     

铜蒸气激光器的绝热结构对有效增益区的影响

讨论了放电口径在６ｃｍ以上的１００Ｗ铜蒸气激光器绝热结构对管壁温度分布的影响，从而对其有效增益区长度的影响。给出了两种不同绝热结构的理论模拟和实验结果     

50瓦铜蒸气激光器放电管设计

激光放电管是铜蒸气激光器的关键部件,激光放电管的设计优劣直接影响着铜蒸气激光器的研制。本文主要描述了50瓦铜蒸气激光器激光放电管的设计过程,对放电管的绝热层进行了热计算,结合实际情况得到了结构参数。对放电管的真空密封、缓冲气体循环系统、水冷套等部件进行了设计,给出了各部件的具体结构形式。用该激光放电管进行实验研究,振荡级功率稳定在36瓦以上,用作放大级时平均提取功率达到了52瓦。     

铜蒸气激光器热透镜特性的分析与测量

本文用光束偏转法和干涉法分别测量了以熔石英为窗口材料的铜蒸气激光器及其窗口的热透镜效应。实验表明：铜蒸气激光器工作时的等效热透镜由放电管内气体负透镜和窗口的正透镜复合而成，理论分析与实验结果相符。     

半导体抽运碱金属蒸气激光器研究进展

相比于固体和化学激光器,半导体抽运碱金属蒸气激光器以其极高的量子效率、气体介质易于流动散热、高光束质量、不存在单口径功率限制、安全可靠等优点显示出极大的优势和良好的发展潜力。概述了碱金属激光器的基本原理和最新研究进展,分析了高功率定标放大可能遇到的障碍和解决途径,并预测了未来的发展趋势。     

紧凑型10瓦级铜蒸气激光器

为了克服通常铜蒸气激光器系统大、运行操作复杂和维护麻烦的缺点,采用封闭式激光管、脉宽调制开关型脉冲充电技术、双级磁脉冲压缩技术和模块化风冷结构设计研制了一种紧凑型铜蒸气激光器,该激光器体积小、采用220VAC供电,实现了开机自动化和免维护运行。     

用于高功率铜蒸气激光器的磁脉冲压缩器

研制成一套用于高功率铜蒸气激光器的单级磁脉冲压缩装置。从磁材料的物理特性概述了设计过程中要注意的问题,包括材料的选择、装置的几何尺度和装置实际阻挡直流高压能力的确定。     

20W铜蒸气激光器的数值模拟

本文采用自洽模型,对20W铜蒸气激光器的放电动力学过程进行了数值模拟,其结果与实验相符。     

One watt average power by second harmonic and sum frequencygeneration from a single medium scale copper vapor laser

Ultraviolet (UV) powers of over 1 W have been obtained by second harmonic and sum frequency generation from a single medium scale (20 W) copper vapor laser (CVL) using a new focal geometry in which the CVL beam is focused in only one direction to produce a line focus within a BBO crystal. High optical conversion efficiencies, 20 and 30%, are observed for the low divergence (~-10 times the diffraction limit) and diffraction-limited components of the CVL output, respectively. Wall-plug efficiencies for UV generation are up to 0.04%. Efficient frequency conversion has also been demonstrated for CVL operating conditions unsuited to the generation of diffraction limited output     

Time resolved beam divergence from a copper vapor laser withunstable resonator

The temporal evolution of the far-field intensity distribution (and hence beam divergence) for the output of a CVL operating with both on-axis and off-axis unstable resonators is investigated in detail. The CVL output pulse consists of several temporally resolved components, where each successive component has lower divergence approaching the diffraction limit. A comprehensive model for the divergence of each temporal component from a CVL operating with a variety of unstable resonators is presented. In this model the resonator controls the output divergence by imposing geometric constraints on the propagation of spontaneous emission on repeated round-trips through the unstable resonator equivalent lensguide. Effects of resonator asymmetry and radial gain variations on the far-field intensity distribution (and hence divergence) are evaluated. Experimental measurements of the temporal evolution of output divergence from a CVL operating with both on-axis and off-axis unstable resonators and for a variety of excitation conditions are also presented. For CVL operation at high pulse repetition frequency the ASE at the start of the laser pulse has an annular profile. This annular gain distribution is found to modify the output far-field intensity distribution of the earlier temporal components of the laser pulse. For on-axis unstable resonators these components are found to have annular far-field intensity distributions, whereas for off-axis unstable resonators they have greatly reduced but anisotropic divergence     

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.     

Copper lasers go for industrial gold

The copper-vapor laser (CVL), a relative newcomer to the materials processing area, is already showing its superiority in a variety of applications traditionally addressed by other lasers or alternative techniques. Driving its development is a Pan-European collaboration under the Eureka-Eurolaser umbrella, which has brought together more than 20 leading organizations in the field of CVL design, systems design, and materials processing applications. This consortium is now well-placed to take the CVL successfully to the marketplace. Laboratory lasers can now deliver more than 750 W, the highest of any visible lasers now available. Commercial devices are available from 15 to 120 W. As a consequence of this development, and its unique blend of operating wavelength, high power capability, and high pulse repetition rate, the copper laser presently enjoys an advantage in a wide variety of areas in manufacturing and production, especially its ability to drill and cut many materials that are difficult to process by other methods     

Time-resolved measurements of excited state densities in a coppervapor laser

Time-resolved measurements of copper and neon buffer gas excited-state densities in a copper vapor laser (CVL) during the excitation pulse and early afterglow are reported for both optimum and nonoptimum power-input conditions. The optimum condition results demonstrate that the termination of the laser pulse in the CVL is due not only to filling of the lower laser level, but also to a reduction in the upper laser-level pumping related to the collapse of power input to the plasma during the excitation pulse. Time-resolved measurements of excited-state densities over a wide range of input-power conditions clearly illustrate that the increase in copper density with power input reduces the peak electron temperature in the plasma during the excitation pulse. This reduction in peak electron temperature is important in limiting the scaling of CVL output power with input-power-copper density     

Average-power scaling of self-heated Sr+ afterglowrecombination lasers

The performance of a large-bore (25-mm) self-heated Sr⁺ (430.5-nm) recombination laser with longitudinal excitation is discussed in relation to the prospects for scaling average output power to the 5-10-W regime. Average-power scaling is found to be limited in large-bore laser tubes by slow interpulse thermal relaxation in the laser gas mixture with strong radial gradients in species' densities and temperatures at only modest pulse repetition frequencies, leading to premature termination of the population inversion on the tube axis. Proposals for circumventing these limitations in order to permit generation of multiwatt average laser output power at 430.5 nm from Sr ⁺ are discussed     

Sum frequency mixing of copper vapor laser output in KDP andβ-BBO

Generation at 271 nm by frequency summing the two copper vapor laser (CVL) output wavelengths (at 511 and 578 nm) in β-BBO and KDP is reported. A maximum sum frequency output of 100 mW was obtained for 6.8 W total pump power from a CVL operating with a fully unstable (M =16) confocal cavity     

改善铜蒸气激光输出特性的研究

介绍了铜蒸气激光器的发展及其输出特性。总结了近年来改善铜蒸气激光输出特性的研究。