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value="http://forum.oecr.com/plugin.php?id=attachcenter:page&aid=25376" size="50" /></p> </div> <div class="bm"> <div class="bm_c xld"> <b>激光冷加工:</b><div class="postmsg">激光冷加工是直接打断化学键的激光加工，355nm 大概是3.5ev，但到底是热还还是冷，还要看材料，有没有达人有经验的，那些材料可以那些不行，介绍下，严重感谢。</div> <div class="postmsg">目前来看，激光冷加工的最有力工具还是飞秒激光，几乎可以对所有材料进行精细加工，如各种金属、玻璃、聚合物、炸药、晶体，等等。<div class="quote"><blockquote>飞秒激光微加工展现了许多优异的特性，例如确定的烧蚀阈值、高可重复性、高效率、更小的热影响区和极好的加工柔性等。飞秒脉冲与材料的相互作用过程中，自由电子主要通过光致电离（多光子电离和隧道电离）产生；脉冲前沿通过光致电离产生种子电子，这些种子电子在脉冲作用下发生雪崩从而使材料发生光学击穿。该过程不像长脉冲（>10 ps）那样依赖于材料中的缺陷，因而超短激光脉冲对材料的烧蚀阈值是确定的。同时，超短脉冲与长脉冲相比，达到烧蚀阈值功率所需要的能量更小，从而沉积到材料中的能量也更小；材料中所沉积能量的减少将导致更精确地烧蚀或体内改性。因此，飞秒激光脉冲对材料的烧蚀远比长脉冲规则，可重复性极高。</blockquote></div><br /> 目前主流的商用飞秒激光系统的工作波长都在800nm附近，对应的单光子能量约1.5eV，对于大多材料，均可通过多光子电离机制进行加工，此时热效应几乎可以忽略。对于3.5eV的禁带宽度，应为3光子电离，fs激光应该可以胜任。<br /> <br /> </div> <div style="height200px;"></div> </div> </div> </div> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a 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