共查询到18条相似文献,搜索用时 281 毫秒
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利用时空变换获得超短激光脉冲 总被引:1,自引:1,他引:0
由LD抽运Nd-YLF固体激光器输出的单纵模调Q激光脉冲,脉宽约为85ns,经过快速LiNbO3电光偏转器实现时空变换,用狭缝削取脉宽约为1ns的超短激光脉冲。导出激光束通过偏转器后扫描光线长度与加到偏转器上的快速电压脉冲变化率关系,并在实验中分别用MOS管和雪崩管高压电脉冲发生器取代价格昂贵的冷阴极管高压电脉冲发生器,获得激光脉冲宽度压缩约两个量级,且实现激光脉冲宽度可调。 相似文献
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利用雪崩管驱动电光偏转器实现稳定纳秒激光脉冲输出 总被引:3,自引:0,他引:3
利用雪崩管堆驱动LiNbO3电光偏转器对激光脉冲进行快速偏转.实现幅度稳定的纳秒整形激光脉冲;激光脉冲振幅不稳定度从振荡器输出的单纵模调Q激光脉冲的10%(RMS)降低到4%(RMS),大大改进了纳秒量级整形激光脉冲幅度稳定性。 相似文献
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《中国激光》2017,(6)
惯性约束聚变精密物理实验要求高功率激光驱动器具备时域-频域精密调控能力,以实现对激光与等离子体相互作用过程中非线性效应的抑制。基于保偏光纤和单偏振光纤技术,采用温度调谐双振荡器结合两级波导相位调制器实现激光脉冲频域精密调控,采用两级高速电光调制脉冲整形技术实现激光脉冲时域精密调控,将微波射频信号取样检测与声光开关进行连锁以确保整个系统的安全运行。实验获得了光谱带宽为0.15~0.3nm、中心波长范围为1052.4~1053.6nm的连续可调微焦耳级激光脉冲,波长调谐精度为0.1nm,在微焦级实现了对比度大于500…1的高对比度整形激光脉冲,脉冲时间波形顶部调制深度小于10%。 相似文献
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在集成光学信息处理和通讯系统中,声光Bragg偏转器是关键性的有源器件,因此实现具有尽可能宽的带宽和尽可能高的偏转效率的器件是很重要的.我们在钛扩散Y-切LiNbO_3平面光波导上利用两个倾斜SAW相控阵换能器设计制作了导波声光Bragg偏转器.用0.63μmHe-Ne激光进行了Bragg偏转实验,光斑质量较好.在280MHz的中心频率上测得200MHz的偏转带宽和在210mWRF驱动功率下40%的偏转效率.最后,评价了这种宽带偏转器结构的优缺点,例举了在光通讯和RF信息处理中的应用. 相似文献
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论述一种新的激光脉冲整形方法-利用任意形状的整形电脉冲直接驱动半导体激光器,产生与电脉冲形状一致的激光脉冲, 作为高功率激光装置的种子光源。使用GaAs 场效应管作为开关器件,使用超宽带脉冲触发场效应管产生整形电脉冲,引入阻抗渐变微带技术克服了触发脉冲损耗对级联场效应管数量限制,将整形电脉冲脉冲宽度扩展到10 ns。以整形电脉冲直接驱动半导体激光器,可产生脉宽为10 ns,时域调节精度为330 ps 的任意整形激光脉冲。 相似文献
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A method for timing point detection in a laser pulse is presented. A pulse shaping circuit is placed at the input of the receiver to achieve a large dynamic range without gain control and timing errors caused by signal clipping. A parallel resonant circuit is proposed as the shaping circuit. 相似文献
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Lee B.Y. Kobayashi T. Morimoto A. Sueta T. 《Quantum Electronics, IEEE Journal of》1992,28(7):1739-1744
New types of electrooptic deflectors with high speed and high efficiency, which are useful for ultrafast optical switching and ultrashort optical pulse generation, are described. These deflectors are driven by an X -band standing wave along the microstrip line on an electrooptic crystal. A time-varying spatial slope of the refractive index is induced in the crystal by the electric standing wave. As a result, the ultrafast deflection is carried out. The operation of such deflectors constructed on a LiTaO3 crystal using a 514.5-nm CW argon laser and a 9.35-GHz driving frequency was confirmed experimentally. In addition, the optical pulse compression from CW to 9.35 GHz, 16 ps was carried out with a diffraction grating, and picking out the 18.7-GHz, 8-ps pulse train was also carried out using a slit as a temporal window 相似文献
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暗脉冲激光在光波导中传输噪声小、损耗低,因此在信号处理方面比传统亮脉冲更有优势。介绍了暗脉冲激光器的国内外研究进展,重点介绍了经后期光学或电学整形产生暗脉冲和激光器直接产生暗脉冲的各种理论方案,最后对暗脉冲激光器的应用和发展前景进行了展望,并指出了目前还存在的问题。 相似文献
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利用雪崩晶体管作为高速开关器件、根据并联充电、串联放电原理设计了一种串并联相结合的MARX电路,以该电路为基础设计了一种低抖动高压脉冲驱动源,并将其应用于紫外激光脉冲的电光开关削波系统。通过同步调节器调节高压驱动脉冲和激光电光系统的时间匹配度,获得了驱动电脉冲与电光开关耦合的最佳工作状态;对匹配过程中的电光开关工作状态以及激光脉冲压缩过程进行了分析和研究,当高压驱动电脉冲幅度为2 690 V,脉宽为7.9 ns时,可以将脉宽为7.1 ns的紫外激光脉冲压缩至2.1 ns,KDP晶体的透光率达到了92.2%,电光开关的效率达到了31.7%。 相似文献
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Kazuyuki Uno Hiroyuki Hayashi Tetsuya Akitsu Takahisa Jitsuno 《Journal of Infrared, Millimeter and Terahertz Waves》2013,34(3-4):217-224
In a longitudinally excited CO2 laser with a short laser pulse, similarly to TEA and Q-switched CO2 lasers, a fast discharge is very important. We investigated the use of a fast discharge circuit to obtain a high spike laser pulse in a longitudinally excited CO2 laser. We compared a traditional capacitor-transfer circuit having a buffer capacitance of 700 pF with our direct-drive circuit in which the buffer capacitance is removed. The direct-drive circuit produced a fast discharge and a high spike laser pulse. We also investigated the effect of a resistance connected in parallel with the discharge tube to eliminate low discharge current after the main discharge. A low resistance of 1 kΩ or less acted as a shunt resistance. The shunt resistance was effective in decreasing the energy of the laser pulse tail at high gas pressure. 相似文献