Enhancement of EUV emission intensity from particles in a droplet by exploding the droplet
Enhancement of EUV emission intensity from particles in a droplet by exploding the droplet
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DOI：
10.1088/0022-3727/42/15/155203
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发表时间：
2009-08
期刊：
影响因子：
--
通讯作者：
Jingquan Lin;T. Tomie
中科院分区：
文献类型：
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作者：
Jingquan Lin;T. Tomie
激光等离子体是以含有氮化硼(BN)颗粒的水滴为目标，采用预脉冲/主激光脉冲方案产生的，在该方案中，预脉冲被发送以爆炸性地蒸发液滴。对含有BN颗粒的爆炸液滴的阴影测量表明，水块的膨胀速度约为200m S−1，远远高于BN颗粒的膨胀速度(小于5m S−1)。与单激光脉冲发射液滴的情况相比，双脉冲方案使BN颗粒在4.86 nm附近的极紫外(EUV)发射增强到原来的2倍以上。EUV发射的增强归因于液滴爆炸汽化后BN粒子对激光能量的主吸收增加。
Laser plasma is produced with a boron nitride (BN) particle-included water droplet as a target and a pre/main laser pulse scheme in which the pre-pulse is sent to explosively vaporize the droplet. Shadowgraph measurement of the exploded BN particle-included droplet shows that the water block expands at a velocity of about 200 m s−1, which is much higher than the expansion velocity of the BN particles (less than 5 m s−1). Extreme ultraviolet (EUV) emission around 4.86 nm from BN particles is enhanced to more than a factor of 2 with the dual-pulse scheme in comparison with the case of shooting the droplet with a single laser pulse. The enhancement of EUV emission is attributed to an increased main laser energy absorption by the BN particles after explosive vaporization of the droplet.