Analysis of interaction characteristics between combined pulsed laser and front/rear surface of BK7 glass

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2025-05-06 DOI:10.1016/j.jnoncrysol.2025.123589

Yunxiang Pan , Hongchao Zhang , Dandan Chen, Ling Yuan, Zewen Li, Zhonghua Shen, Jian Lu

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Abstract

The combined pulsed laser (CPL), consisting of a nanosecond (ns) and millisecond (ms) laser separated by a certain period, has been demonstrated to have higher processing efficiency when interacting with optical materials. The damage thresholds of the rear surfaces of optical elements are also well-known to be lower than those of the front surfaces. In this study, the influences of millisecond laser fluence and delay on CPL irradiation of the front and rear surfaces of BK7 glasses were studied. A conical melting zone can be generated immediately after the incidence of the nanosecond laser when the laser is focused on the front surface. There is an optimal delay range in which the probability of generating a conical melting zone is the largest. The zone continues to grow as the millisecond laser irradiates. When the laser is focused on the rear surface, the millisecond laser fluence enlarges the damaged area induced by the nanosecond laser with 100 % probability. This laser energy is significantly lower than that of the front surface. This study can provide guidance for further improving the coupling efficiency of laser energy during laser-material interactions.

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组合脉冲激光与BK7玻璃前后表面相互作用特性分析

由间隔一定时间的纳秒（ns）和毫秒（ms）激光组成的组合脉冲激光器（CPL）在与光学材料相互作用时具有较高的加工效率。众所周知，光学元件后表面的损伤阈值也低于前表面。本研究研究了毫秒激光通量和延迟对BK7玻璃前后表面CPL辐照的影响。当激光聚焦在前表面时，纳秒激光入射后立即产生锥形熔化区。存在一个最佳延迟范围，在该延迟范围内产生锥形熔化区的概率最大。当毫秒激光照射时，该区域继续增长。当激光聚焦在后表面时，微秒激光通量100%增大纳秒激光诱导的损伤面积。这种激光能量明显低于前表面的能量。该研究可为进一步提高激光与材料相互作用过程中激光能量的耦合效率提供指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.