闪光灯泵浦的Nd:KGd(WO4)2激光器

报道了用闪光灯泵浦的掺钕的钨酸钆镓(Nd³⁺:KGd(WO₄)₂激光器.在重复频率1Hz,脉宽120μs的灯泵下,测量了不同透过率下激光输出能量,获得最大输出能量384mJ,斜率效率1.0%,外推阈值0.54J.在调Q运行时,Nd:KGW晶体的斜率效率为0.16%,最大输出能量46mJ.     

低重复率的Ti:Al2O3飞秒激光放大器研究

本文报道了重复频率为10Hz的Ti:Al₂O₃飞秒激光放大器的研究.基于脉冲啁啾放大技术和采用再生/多通放大装置,得到了能量为8mJ的放大光脉冲,在该放大系统中,激光脉冲获M净增益约8×10⁷.     

用于薄膜沉积的XeCl激基激光器研制

以镀制半导体薄膜、巨磁薄膜、金刚石及其它薄膜,外延生长及后续的光刻,激光与物质的相互作用、等离子体研究为目的,设计、研制了脉冲放电激励的XeCl激基激光器.试验结果表明:激光脉宽18ns,单脉冲能量150mJ,矩形光斑大小2cm×1cm,束散角3mrad,最高重复频率5HZ.与同类激光器相比,具有结构简单、造价低廉、性能稳定等特点.     

大功率脉冲TEA CO2激光器配气比对输出的影响

大功率脉冲TEA CO2激光器的放电腔在不同工作气压和不同配气比例条件下对激光器输出能量和电光转换效率均有较大影响,因此,通过充气压力从30kPa到60kPa的改变和配气比例CO₂:N₂＝1:1到CO2:N2＝1:4的变化,可以改变激光器的输出能量,提高激光器电光转换效率。实验结果表明：当CO2:N2的配气比例为1:3时,激光器输出的电光转换效率存在最佳点。在最佳配气比例CO2:N2:He＝3:9:28,总气压40kPa和注入激励电能保持不变的情况下,激光器单脉冲放电时的输出能量为24.6J;激光器高重复频率放电运转时的电光转换效率达16.4％。激光器的最高放电频率可以达到500Hz并且连续稳定运行工作。     

LD泵浦Nd3+∶GdVO4/Cr4+∶YAG固体激光器

通过合理设计，精密调控各元件和温控电流，得到了平均功率为70mW，脉冲宽度为22ns，重复频率为14 kHz，峰值功率高达230 W的Nd³⁺∶GdVO₄/Cr⁴⁺YAG绿光脉冲激光器.腔外采用望远镜系统聚焦，经KTP晶体倍频后，得到了平均功率为28.8 mW，脉冲宽度为19 ns，重复频率为14 kHz，峰值功率高达108 W的绿光激光输出，转换效率高达.指出了小光斑对倍频晶体带来的影响.     

固体相干成像激光雷达实验

采用单块非平面环形激光器的本地振荡器、种子注入高重复频率Q开关Nd∶YAG激光器的功率振荡器、振镜扫描偏转和光学接收装置、控制和显示等部件构成固体相干成像激光雷达实验装置.利用该装置对目标进行了距离成像和速度测量实验.在图像分辨力为64×64时,获得了成像速度为8 fps的目标距离图像.速度测量平均误差为6%.     

气体激光器射频至微波放电激发的某些规律

本文研究了射频至微波激发的Xe和He-Ne原子激光器及CO₂分子激光器,结合各具体激光器的实验结果对其放电物理进行了讨论,提出获得高效率的关键是有效控制放电空间的电子能量,得出了一些有指导意义的结论.     

高重复频率、单模纳秒脉冲全光纤激光器

报道了一种基于主振荡放大技术的全光纤脉冲激光器.种子激光器使用直接调制的单纵模半导体激光器,其输出波长为1 063.8 nm,重复频率100 kHz～10 MHz连续可调谐,光纤放大器采用了多级放大器级联的方法.在重复频率100 kHz、脉冲宽度5 ns时,激光器获得了平均功率为1.2 W,峰值功率为2.4 kW的单横模激光脉冲输出.     

高重复频率、单模纳秒脉冲全光纤激光器

报道了一种基于主振荡放大技术的全光纤脉冲激光器.种子激光器使用直接调制的单纵模半导体激光器,其输出波长为1 063.8 nm,重复频率100 kHz~10 MHz连续可调谐,光纤放大器采用了多级放大器级联的方法.在重复频率100 kHz、脉冲宽度5 ns时,激光器获得了平均功率为1.2 W,峰值功率为2.4 kW的单横模激光脉冲输出.     

S2分子光谱特性及其应用

基于对海洋进行快速大面积探测或对潜通讯的需要．开始了对S₂分子激光器的研制。S₂分子激光器与其它几种激光器相比具有明显的优势．介绍了S₂分子的获得方式、S₂分子的势能曲线及特点、S₂分子光谱特性等。经过反复论证及试验，取得了阶段性研究成果，为横向脉冲快放电小型S₂分子激光器的研制及实现激光振荡奠定了坚实的基础。     

A 3 kW average power tunable TEA CO2 laser

A high average power line-tunable TEA CO₂ laser is described. Average output power up to 3 kW is achieved at repetition rate of 180 Hz. The maximum output power is almost equal among the four spectrum bands of CO₂ laser (the P and R branches of 00°1–10°0 and 00°1–02°0 transition bands). Several special technologies including rotating spark gap switching, PCB (printed circuit board) preionization and zeroth-order grating coupling are employed.     

Power scaling of printed-circuit-board preionized TEA CO2 laser up to 3.6 kW

A high average power, high-repetition-rate TEA CO₂ laser employing printed-circuit-board preionizer is described. The power scaling of this preionization configuration has been demonstrated. The average output power reaches 3.6 kW at pulse repetition rate of 180 pps. Furthermore, the scaling-up ability of the rotating spark gap as high-voltage switch for high-average-power gas laser has been validated.     

高重复频率XeCl准分子激光器

本文报道一台高重复频率XeC准分子激光器的结构及其特性。采用接地栅金属陶瓷闸流管开关和气体横向流动系统及自动紫外火花预电离的放电结构。该激光器最高单脉冲能量为200mJ,最高重复脉冲频率为107Hz,最大平均功率18W。     

A sequential discharge TEA CO2 laser with high repetition rate and high output power

In this paper, a novel excitation method named as sequential discharge is realized in a two-module TEA CO₂ laser by using a special rotating spark gap. It is demonstrated that the repetition rate and the output power of a laser can be multiplied through this method. For the two-module TEA CO₂ laser in the experiment, the repetition rate is 300 Hz and the average power is 356 W when each module discharges; the repetition rate is 600 Hz and the average power is 713 W when the two modules discharge sequentially.     

A 300 Hz TEA CO<Subscript>2</Subscript> Laser

We present a design and construction of a high pulse repetition rate (PRR) transversely excited atmospheric (TEA) CO₂ laser with ultraviolet preionization. We use a new combination of spark and corona preionizations. Under semi-sealed off condition, we obtained 220 W at 300 Hz with 7.7% efficiency in a 735 mJ/pulse. The best results we have obtained in different experiments are a 1.07 J/pulse, 320 Hz PRR, 11 MW peak power, and 10.6% efficiency.     

Miniature high-repetition-rate TEA CO2 laser with surface-wire-corona preionization

In this article, an experimental study of a miniature, sealed-off, high-repetition-rate transversely excited atmospheric-pressure (TEA) CO₂ laser with a kind of surface-wire-corona preionization (SWCP) is described. We have utilized an SWCP consisting of SiO₂ dielectric tube and a fine wire strained and attached to the dielectric surface. A BN ceramic material, which has an extremely low coefficient of thermal expansion of about 5 × 10⁻⁷/°C was employed as a supporter of the resonator. A measurement on emission spectra of SWCP has been reported. By applying SWCP to the TEA CO₂ laser, efficient laser operation at an overall efficiency of 9.8% with an output energy of 150 mJ has been achieved from a small discharge volume of 25 cm³ with an active length of 230 mm. At the pulse repetition frequency of 60 Hz, the TEM₀₀ mode of laser beam with pulse width of 60 ns was obtained.     

The “SKATE” CO2 Gigawatt Laser for a Laser-Plasma Generator of Ions and Nuclei

A set-up of the CO₂ SKATE and its output characteristics are described. The system is based on a self-sustained gas discharge module with x-ray preionization that ensures reliability and stable repetition rate operation at 1 Hz for a long time. Measurement of the initial electron density in the discharge volume produced by an x-ray gun is presented for different gases and their mixtures, which is of independent interest for some applications of x-ray preionization. Data on measurements of the low-intensity signal gain and laser parameters for a free-running generator configuration are presented as well as long-term operation characteristics. This laser system has been used as a CO₂ generator with gigawatt peak intensity and high spatial–temporal characteristics. In particular, the laser can be used as a driver for a source of multicharged ions in contrast to the laboratory prototypes previously investigated.     

高重复率XeCl准分子激光器的放电特性

本文报道紫外预电离放电泵浦的高重复率XeCl准分子激光器的放电特性,分析了放电参数的改变对放电过程的影响.最佳转换效率达2.2%.     

相位板偏振偏转角对径向偏振光的梯度力分布的影响

研究了同心分区偏振偏转相位板对径向偏振光梯度力的调制效应。给出了相位板各部分偏振偏转角不同时,光学梯度力的分布情况。模拟结果表明:随着同心分区相位板各部分的半径和偏振旋转角的改变,光学梯度力方向及大小明显变化,且会产生许多可控的梯度力分布模式,可应用于微粒的收集、分离和合并。结果显示同心分区相位板对径向偏振光的调制可以用来生成可调光镊。     

A Bidirectional, Diode-Pumped, Passively Mode-Locked Nd：YVO4 Ring Laser with a Low-Temperature-Grown Semiconductor Saturable Absorber Mirror

We report the operation of a bidirectional picosecond pulsed ring Nd：YVO4 laser based on a low-temperaturegrown semiconductor saturable absorber mirror. Except for the laser crystal, the six-mirror ring laser cavity has no intra-cavity elements such as focusing lens or mirror. The bidirectional mode locked pluses are obtained at the repetition rate of 117.5 MHz, pulse duration of 81 ps, power of 2 × 200 mW.