Processing fused silica with wet chemical technology

Hui YE; Ya-guo LI; Chen JIANG; Qi CHEN

doi:10.3788/OPE.20202802.0382

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Processing fused silica with wet chemical technology

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-07-16

- Processing fused silica with wet chemical technology
- Optics and Precision Engineering Vol. 28, Issue 2, Pages: 382-389(2020)
- 作者机构：
  
  1.上海理工大学机械工程学院, 上海 200093
  2.中国工程物理研究院激光聚变研究中心, 绵阳 621900
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20202802.0382
  CLC： TH145; O43
- Received：03 June 2019，
  
  Revised：01 August 2019，
  
  Accepted：01 August 2019，
  
  Published：25 February 2020
- 稿件说明：
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Hui YE, Ya-guo LI, Chen JIANG, et al. Processing fused silica with wet chemical technology[J]. Optics and precision engineering, 2020, 28(2): 382-389.
DOI：

Hui YE, Ya-guo LI, Chen JIANG, et al. Processing fused silica with wet chemical technology[J]. Optics and precision engineering, 2020, 28(2): 382-389. DOI： 10.3788/OPE.20202802.0382.

摘要

为了提高熔石英元件的抗激光损伤能力，采用基于氢氟酸刻蚀的湿法化学技术去除元件内的激光损伤诱因。利用不同的氢氟酸溶液处理经氧化铈抛光的熔石英元件，并对元件的刻蚀速率、表面洁净度、粗糙度、透过率和激光损伤性能进行评价。研究结果表明，与传统的静态刻蚀相比，在质量分数为6%的氢氟酸刻蚀溶液中引入能量密度约为0.6 W/cm

的兆声能量对元件的溶解速率和激光损伤性能没有明显的提升作用；化学刻蚀产生的沉积物对元件表面粗糙度和透过率均有不利影响，且沉积物比例与所用的刻蚀液成分和浓度密切相关；经质量分数6%或12%的纯氢氟酸溶液刻蚀(5±1) μm深度后，熔石英元件的激光损伤阈值相比于未刻蚀元件提升了约1.9倍；熔石英元件的激光损伤性能与表面粗糙度和透过率之间不是简单的线性关系，但激光损伤阈值较理想的元件(＞20 J/cm

@3ns)往往具有较光滑的表面，即表面粗糙度＜2 nm，由此可以确定有利于熔石英元件激光损伤性能的刻蚀条件，并获得元件表面粗糙度的控制指标。

Abstract

HF-based etching is used in this paper to remove laser damage precursors to improve the laser-damage resistance of fused silica optics. Several CeO

-polished samples were post-treated by various HF-based etchants and the responses of etching rate

surface cleanliness

roughness

transmission

and laser damage performance of optics to the etching state

etchant composition

and etched depth were investigated. No solid evidence shows that adding acoustic power ~0.6W/cm

to 6%wt. HF contributes to either the etching rate or the damage performance of samples. The appearance of etching-induced deposits

which deteriorate both the surface roughness and transmission significantly

is highly dependent on the composition and concentration of the etchant. The damage testing results reveal that 6%wt. and 12%wt. HF can efficiently improve LIDT optics ~1.9 times the value of an un-etched sample with a (5±1) μm material removal value. Moreover

the damage performance of the optics is found to be somewhat isolated with surface root mean square (RMS)roughness and light transmissionandthat surfaces with a high laser-induced damage threshold (LIDT

20 J/cm

@3ns) are usually smooth with an RMS roughness

2 nm. Therefore

the wet chemical etching condition that yields surfaces with the desired damage performance can be obtained and the control criterion of surface roughness can be determined.

关键词

Keywords

references

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