Effects of wavelengths combination on initiation and growth of laser-induced surface damage in SiO2

L. Lamaignère, S. Reyné, M. Loiseau, J. Poncetta, H. Bercegol
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引用次数: 25

Abstract

Campaigns of laser damage tests at 1w of Nd-YAG laser (1064 nm), 3w and with a combination of these two wavelengths, were conducted to complete previous existing data on damage growth in fused silica output surface. It is known that UV light is very effective in inducing preexisting damage craters to grow. When both wavelengths are present, the effect of 1w beam on damage growth depends on the delay between the IR and the UV beam. When the 1w reaches the sample before the 3w, it has nearly no consequence on growth rate. On the opposite, when the IR beam is delayed and strikes the sample after the 3w pulse, its energy simply adds to the UV in enhancing damage growth. Damage initiation is much more affected by 3w than 1w pulses. However, the number of surface damage craters also increased by the addition of 1w photons to the UV beam.
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波长组合对SiO2激光表面损伤萌生和生长的影响
在1064 nm的Nd-YAG激光(1w)、3w以及这两种波长的组合下进行了激光损伤测试,以完成先前关于熔融石英输出表面损伤生长的现有数据。众所周知,紫外线在诱导先前存在的损伤坑生长方面非常有效。当两种波长都存在时,1w光束对损伤生长的影响取决于红外和紫外光束之间的延迟。当1w在3w之前到达样品时,它对生长速率几乎没有影响。相反,当红外光束延迟并在3w脉冲后撞击样品时,其能量只是增加了紫外线,从而增强了损伤的生长。3w脉冲比1w脉冲对损伤起爆的影响更大。然而,在紫外光束中加入1w光子后,表面损伤坑的数量也增加了。
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