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脉冲放电时间对XeCl准分子激光输出的影响 总被引:1,自引:0,他引:1
本文研究了脉冲放电时间对X光预电离XeCl脉冲雪崩放电激光器激光和荧光特性的影响。结果表明限止放电型XeCl准分子激光脉冲持续时间的因素是HCl在放电过程中分解产生的H对XeCl(B)态的猝灭效应。 相似文献
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为了确保窄脉宽XeCl准分子激光系统获得高峰值功率紫外激光脉冲,实验研究了紧凑型四向电子束泵浦XeCl准分子激光器的输出特性。通过调节激光腔室气体介质的总气压和气体摩尔比、激光器的充电电压、二极管阳极钛箔厚度等参数,发现了激光能量随以上条件的变化规律,分析得到了激光器运行的最佳条件。在最佳条件下XeCl准分子激光器的脉冲能量大于100 J、脉宽约200 ns,电光效率约为5.81。另外,通过改变激光器内部Marx发生器的开关气压,研究了紧凑型电子束泵浦XeCl准分子激光器输出激光脉冲的延迟抖动特性,发现激光脉冲的延迟抖动可优于20 ns。研究结果表明:紧凑型电子束泵浦XeCl准分子激光器可实现脉冲抖动小于20 ns、103 J的高能紫外激光输出,可满足窄脉宽XeCl准分子激光系统运行的需要。 相似文献
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系统研究了窄线宽低噪声单频连续光纤激光器、高能量纳秒长脉冲单频光纤激光器以及高峰值功率纳秒短脉冲光纤激光器三类高性能光纤激光器:实现了工作于1、1.5及2 m波段的单频连续光纤激光器,典型光谱线宽小于3 kHz,强度噪声接近于散粒噪声极限;实现了高能量单频光纤激光器,脉冲能量超过200 J,重复频率20 kHz,脉冲宽度100~500 ns,激光波长位于1.5 m波段;实现了高峰值功率纳秒短脉冲光纤激光器,峰值功率超过700 kW,重复频率10 kHz,脉冲宽度3 ns;同时还实现了高重频高峰值功率纳秒短脉冲光纤激光器,峰值功率超过200 W,重复频率3 MHz,脉冲宽度1~5 ns。文中阐述了以上几类高性能光纤激光器在激光雷达探测系统中的应用前景。 相似文献
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(一)无腔染料激光器 一、引言 不使用共振腔便能得到强受激发射的光通称为放大自发辐射NIASE,一般也叫超辐射或超荧光。它是自发辐射在已形成粒子数反转分布的高增益激活介质中沿激活区轴向传播时通过感应发射过程依次行波放大所产生的。 相似文献
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激光线宽和脉冲宽度是激光测风雷达测量精度重要的影响因素。本文分析了风速测量精度的影响因素,理论推导了激光线宽与信噪比关系,以及脉宽引起的功率谱展宽。数值分析表明,线宽增加引起的信噪比下降和脉冲宽度引起的谱线展宽都会导致风速测量精度下降。脉冲累计发数在10000的条件下,相干测风激光雷达系统脉冲宽度和信噪比分别为100 ns、-35 dB或激光线宽小于45 kHz,时,风速测量精度优于0.5 m/s。减小线宽和增加脉冲宽度,可以增加风速测量精度。在相同信噪比条件下,较宽的脉冲宽度的风速测量精度更高。 相似文献
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Kefelian F. O'Donoghue S. Todaro M.T. McInerney J.G. Huyet G. 《Photonics Technology Letters, IEEE》2008,20(16):1405-1407
We have analyzed theoretically and experimentally the linewidth of the first harmonic of the photocurrent (radio-frequency (RF) linewidth) in monolithic passively mode-locked semiconductor lasers. Due to the absence of restoring force, the timing jitter is directly related to the RF linewidth, avoiding possible underestimations made with conventional methods of phase noise measurement. The RF linewidth is also analytically related to the pulse characteristics using Haus's model. The timing stability performance of a promising two-section quantum-dot laser is presented using RF linewidth measurements. Experimental evolution of the RF linewidth with power and pulsewidth is finally compared to the analytical expression. 相似文献
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Nakamura M. Suzuki N. Uematsu Y. Ozeki T. Takahashi S. 《Lightwave Technology, Journal of》1984,2(5):735-740
The relation between laser linewidth and modal noise was studied in a pulse frequency modulation transmission system through employing a distributed feedback laser which shows linewidth broadening of more than 2 Å. A 6-dB signal-to-noise ratio fluctuation for a 7-km transmission system, using a conventional Fabry-Perot laser, was reduced to 0.3 dB for 1.8-Å linewidth. It is pointed out that more than 1-Å linewidth is required to reduce the modal noise and to obtain a high-quality PFM transmission system. 相似文献
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The present paper describes AM mode locking for homogeneously broadened systems, a procedure for measuring linewidths under laser conditions, and finally, experimental results for a 1-atm CO2 laser. Working in the frequency domain, analytic solutions are given for the pulse bandwidth and pulse shape as a function of frequency detuning. We arrive at a simple expression for the maximum positional shift of the mirror distance. It turns out that the linewidth is inversely proportional to the maximum frequency shift and can be obtained independent of the modulation parameters and time constant of the pulse-signal detector. Applying this analysis to an amplitude-modulated CO2 laser the pulsewidth and linewidth have been measured as a function of gas composition and modulation depth. In contrast to predictions deduced from absorption measurements under neutral conditions we find the striking result that under laser-discharge conditions the linewidth increases and the pulsewidth decreases with increasing helium percentage. 相似文献
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Experimental measurements are presented of pulse compression in a backward Brillouin amplifier using SF6 gas pumped by 0.9 GHz linewidth KrF laser radiation. Average pulse durations of 390 ps and energy extraction effieiencies of 40 percent from 24 ns pump pulses have been demonstrated at pressures of 15.3 and 12.6 atm, respectively. 相似文献
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以Cr4+:YAG为饱和吸收体,体布拉格光栅为耦合输出窗,研究了被动调Q闪光灯泵浦Nd:YAG单纵模激光器.通过扭转模腔和体布拉格光栅相结合的方式获得单纵模输出,提高了单纵模输出能量及稳定性.对于不同初始透过率的Cr4+:YAG晶体,得到了单纵模输出能量和脉宽的曲线.单纵模激光最大线宽约为78 MHz.最大单纵模单脉冲输出能量为20.8 mJ,最小的脉宽为13.2 ns,最大峰值功率为1.18 MW. 相似文献
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提出了一种基于1064 nm掺镱光纤激光器泵浦MgO:PPLN的3.83 μm中红外光学参量振荡器。基于单谐振光学参量振荡器的阈值理论和线宽压窄前后的光束能量集中性理论,分析了不同泵浦光束聚焦深度下,谐振腔内光束分布情况以及线宽调制前后能量的不同集中程度对阈值和光-光转换效率所产生的影响。通过采用单个光纤布拉格光栅的方式压窄了泵浦光线宽,对比分析了在不同占空比下,泵浦光线宽压窄前后对中红外光学参量振荡器输出特性的影响。当泵浦功率为18 W,脉冲激光占空比为0.2%,脉宽为100 ns,泵浦光线宽为2.5 nm时,MgO:PPLN中红外光学参量振荡器获得功率为1.42 W的3.83 μm激光输出,光-光转换效率为7.9%。将线宽压窄到0.1 nm后,脉宽为2 ns,MgO:PPLN中红外光学参量振荡器获得最高功率为1.98 W的3.83 μm激光输出,光-光转换效率为11%,光束质量M2=1.89;同时相比于线宽压窄前激光输出效率提高了39.2%。 相似文献