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Plate and λ/2 plate were placed inside the Nd∶YVO4KTP green laser cavity with angle 90°between their fast axis.The composite plate composed of HWP,QWP and KTP has the function of QWP.The composite plate with Nd∶YVO4 can effectively suppress the coupling of polarized modes,and multi-longitudinal-mode lownoise green laser was obtained.Since the composite plate counteracted the phase shift induced by temperature sensitivity of quartz plate,the green laser operated with lownoise reliability in different output power and different operation temperature.The threelongitudinalmode, the noise of less than 0.5% and output power stability of less then 1% for 12 hour are obtained in the green laser.

介绍了一种LD泵浦腔内倍频全固体Nd∶YVO4KTP多纵模、低噪音、高功率稳定绿激光器在Nd∶YVO4KTP绿激光器组成的谐振腔内放置厚度约相等的石英晶体λ2波片和λ4波片，使两波片快轴夹角互呈90°，HWP、QWP与KTP构成复合波片，其作用相当于QWP，此复合波法与各相异性Nd∶YVO4共同作用有效抑制了腔内偏振模耦合，获得多纵模低噪音绿光输出此复合波片相互作用由于抵消了石英晶体波片温度敏感引起的相位延迟量漂移，所以此激光器在不同功率、不同工作温度下，均能稳定可靠地运转于低噪音状态实验结果为，绿光输出纵模数为3个，噪音小于0.5%，12 h功率稳定性优小于1

In order to study the influence of UV pulse laser pre-treatment on surface image of fused silica and validate its upgrade effect on anti UV laser damage ability of fused silica,using 355nm YAG laser raster to scan fused silica optics by means of power increase by degrees periodically,the change of surface image was studied and its anti-laser damage threshold at 355nm was measured.

为了研究紫外脉冲激光预处理对熔石英表面形貌的影响，验证其对熔石英元件抗紫外激光损伤能力的提升效果，利用输出355nm 3倍频紫外脉冲激光的YAG激光器，采用光栅式扫描的方式对熔石英表面进行了全口径能量周期递增的激光预辐照处理，并在处理结束后研究了表面形貌的变化，考核了其在355nm脉冲激光作用下的损伤阈值。

All 5 patients of benign polyp were found to have excellent effect after Nd-YAG laser therapy, and so for, there was no recurrence. Two (esophageal cancer 1 and rectal cancer 1) of 19 patients of G-I cancer had excellent results with tumor size reduced over 90% and endoscope could pass through the stenotic area smoothly after Nd-YAG laser treatment. Six (esophageal cancer 2, gastric cancer 4) of them had good results with tumor size reduced 50-90% and patient could take semiliquid food after laser management. Eight patients (esophageal cancer 2, gastric cancer 4, rectal cancer 2) had fair effects with tumor size reduced less than 50%, but the oral intake or stool passage was improved. Three patients (15.8%) refused further endoscopy and laser management because of poor tolerance.

这5例良性息肉经雷射治疗后，肿瘤完全消失且目前无后发现象。19位恶性癌中，经Nd-YAG雷射治疗后，效果极佳（肿瘤大小减少90%以上，内视镜可通过肿瘤狭窄处）者2例（食道癌及直肠癌各1；效果佳（肿瘤大小减少50~90%，且病人可进食半流体食物）者6例（食道癌2，胃癌4）；效果尚可（肿瘤大小减少50%以下，但饮食进步或排便较过去进步）者8例（食道癌2，胃癌4，直肠癌2；3例患者(15.8%)因不能忍受内视镜及雷射治疗之痛苦，拒绝进一步的治疗而失败。

Now we maufactured products on scale, including: Semiconductor Laser / Low-frequency Treatment Instrument, Al Ga In P Semiconductor Laser Cure Instrument, Single-use Laser Head Cover, Laser Sitz Bath Instrument etc.

现规模生产半导体激光/低频治疗仪、铝镓铟磷半导体激光治疗仪、一次性使用导光头、激光坐浴机等系列产品。

BSpatial characterization of laser induced Cu plasma in air with different laser focusing distancesThe plasma spectra induced by pulsed laser ablation of copper target are measured. By adjusting the distance of the len-sample, the spectrum of air spark plasma、 Cu plasma and the reciprocity of both plasmas are analysed. From the result, it has been shown that the focusing of the laser beam has an important infunence to analyse the properties of the sample.

b 不同的激光焦点位置产生的等离子体光谱的空间特性研究激光烧蚀置于空气中的Cu靶产生等离子体，通过调节透镜与Cu靶的距离，本文观测了激光烧蚀空气产生的空气火花等离子体、激光直接烧蚀铜靶产生Cu等离子体以及空气火花等离子体与Cu等离子体相互作用等不同情况下的激光诱导击穿发射光谱，激光束焦点的位置在分析材料性质的过程中有着重要的影响。

The laser is a laser original Chinese name, is the stimulated emission of optical amplification means, laser engraving machine is laser engraving machine.

而镭射是激光最初的中文名，是受激辐射的光放大的意思，镭射雕刻机即是激光雕刻机。

The results are introduced in this paper. Backscattered light energy is 7.8% of laser energy when laser is focused on Au disk target; when laser beam is smoothed, it is 6.2%. The comparison shows that laser smoothing can restrain backscattered light efficiency.

结果表明：激光辐照Au盘靶时，在聚焦条件下背向散射能量约占打靶激光能量的7.8%；在束匀滑条件下背向散射能量份额下降到6.2%左右，证明了束匀滑可有效抑制背向散射。

Backscattered light energy is 7.8% of laser energy when laser is focused on Au disk target; when laser beam is smoothed, it is 6.2%. The comparison shows that laser smoothing can restrain backscattered light efficiency.

在聚焦条件下背向散射能量约占打靶激光能量的7.8％；在束匀滑条件下背向散射能量份额下降到6.2％左右，证明了束匀滑可有效抑制背向散射。

According to the influence of each laser parameter on processing and the advantage that a laser can achieve high laser quality nearby the last threshold,AOM Q-switched Nd∶YAG pulsed laser is adopted for microdrilling. As a result,the 15μm microhole in 0.7mm-thick zincification plate steel is obtained,and the ratio of depth and width is over 50,100% drilling rate is acquired.

基于各个激光参数对加工微孔的影响以及激光在阈值附近工作时光束质量较好的优点，采用声光调QNd∶YAG脉冲激光器进行阈值附近的微孔加工，在0.7mm的镀锌钢板上获得了直径为15μm的微孔，深径比超过50，打孔成功率为100%。

According to the anti-counterfeiting laser molded holographic imaging technology identifies the hologram of different can be divided into three dimensional laser pulse classics, bolographic anti-false and molded synthetic molding, multiple image laser molding, dynamic molding, dynamic grating molding, embedded hologram molded, inks encryption such as holographic laser molded anti-false identification.

根据激平模压全息不攻假标记全息图不败像技艺的差别可不兵其不合为经典、脉冲不一维激平模压全息不攻假标记以及不合不败模压、众轻图像激平模压、不静态模压、不静态平栅模压、隐不神全息模压、不攻假油墨加密激平模压等全息不攻假标记。

Warden: That's a beautiful dog, but don't bring her again.

那是条漂亮的狗，但是不要再把她带来了。

You get up in the morning – no hangover!

你第二天早上起来的时候—不会宿醉！