多波长激光同时辐照下熔石英元件的损伤研究

邱荣; 蒋勇; 郭德成; 史晋芳; 李翠; 叶成; 周强; 韩伟; 黄进

doi:10.11884/HPLPB202032.190479

多波长激光同时辐照下熔石英元件的损伤研究

doi: 10.11884/HPLPB202032.190479

邱荣^{1, 2,},
蒋勇^{1, 2},
郭德成^{1, 2},
史晋芳^{1, 3},
李翠^{1, 3},
叶成¹,
周强¹,
韩伟⁴,
黄进⁴

1.
西南科技大学极端条件物质特性联合实验室，四川绵阳 621900
2.
四川省军民融合研究院，四川绵阳 621900
3.
西南科技大学制造过程测试技术教育部重点实验室，四川绵阳 621900
4.
中国工程物理研究院激光聚变研究中心，四川绵阳 621900

基金项目: 国家自然科学基金委员会与中国工程物理研究院联合基金项目(U1530109)；国家自然科学基金项目(11972313)

详细信息

作者简介:
邱　荣(1978—)，男，副教授，主要从事强激光与物质相互作用的理论与应用技术研究；43951700@qq.com

中图分类号: O469
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出版历程
- 收稿日期: 2019-11-25
- 修回日期: 2019-12-26
- 刊出日期: 2019-12-26

Laser-induced damage in fused silica under multi-wavelength simultaneous laser irradiation

Qiu Rong^{1, 2
,},
Jiang Yong^{1, 2},
Guo Decheng^{1, 2},
Shi Jinfang^{1, 3},
Li Cui^{1, 3},
Ye Cheng¹,
Zhou Qiang¹,
Han Wei⁴,
Huang Jin⁴

1.
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621900, China
2.
Sichuan Civil-military Integration Institute, Mianyang 621900, China
3.
Key Laboratory of Testing Technology for Manufacturing Process, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
4.
Research Center of Laser Fusion, CAEP, P. O. Box 919-988, Mianyang 621900, China

摘要

摘要: 对比研究了3ω单独辐照、3ω＋2ω和3ω＋1ω双波长同时辐照下熔石英元件的初始损伤和损伤增长规律，重点研究3ω能量密度在其阈值附近时，低能量密度的2ω和1ω对初始损伤和损伤增长的影响，分析了波长间的能量耦合效应。结果表明：双波长同时辐照下，当2ω和1ω能量密度远低于其自身阈值时，它们对初始损伤几率和损伤增长阈值的影响可以忽略，但也会参与初始损伤和损伤增长过程，会增加初始损伤程度和损伤增长系数。基于飞秒双脉冲成像的冲击波速度测量表明，3ω和1ω同时辐照下，波长间的能量耦合效应会促进激光能量向材料沉积的效率。
- 激光诱导损伤 /
- 熔石英 /
- 多波长激光 /
- 初始损伤 /
- 损伤增长
Abstract: The initial damage and damage growth of fused silica optical elements irradiated by 3ω alone, by two wavelengths (3ω＋2ω and 3ω＋1ω) at the same time were studied. When the energy density of 3ω is near its threshold, the influence of 2ω and 1ω of low energy density on the initial damage and damage growth is studied. The energy coupling mechanism between wavelengths is analyzed. The results show that: When the energy density of 2ω or 1ω is much lower than its threshold, irradiating at the same time, their effects on the initial damage probability and damage growth threshold can be ignored. But the initial damage degree and damage growth coefficient will increase. The measurement of shock wave velocity based on femtosecond dual pulse imaging shows that, when 3ω and 1ω irradiate at the same time, the energy coupling effect between wavelengths will promote the deposition efficiency of laser energy to materials.
- laser induced damage /
- fused silica /
- multiwavelength laser /
- initial damage /
- damage growth

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图 1 基于飞秒双脉冲的冲击波速度测量系统的原理示意图

Figure 1. Schematic diagram of shock wave velocity measurement based on double femtosecond pulse

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图 2 基于飞秒双脉冲的熔石英后表面损伤典型阴影成像图

Figure 2. Typical shadow images of rear-surface damage based on double wavelength femtosecond laser

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表 1 双波长同时辐照下熔石英的初始损伤几率

Table 1. Damage probability of fused silica irradiated by dual wavelength laser

wavelengths	energy density/(J·cm⁻²)	damage probability/%	wavelengths	energy density/(J·cm⁻²)	damage probability/%
3ω＋2ω	17＋3	0	3ω＋1ω	17＋5	0
	17＋6	0		17＋10	3
	17＋9	2		17＋15	4.5
	17＋12	5.5		17＋20	6
	20.5＋3	7		20.5＋5	4.5
	20.5＋6	5		20.5＋10	4
	20.5＋9	1.5		20.5＋15	3
	20.5＋12	3.5		20.5＋20	8.5
	24＋3	3		24＋5	5
	24＋6	8		24＋10	7
	24＋9	10		24＋15	8
	24＋12	12		24＋20	14
	27.5＋3	31		-	-

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表 2 2ω和1ω对损伤几率和损伤坑平均面积的影响

Table 2. Influence of 2ω and 1ω wavelengths on damage probability and damage degree

wavelengths	energy density/(J·cm⁻²)	damage probability/%	average area/μm²
3ω	20.5	1.5	2 043
	24	4	3 180
	30.5	28	4 565
	31	33.5	4 737
	33	47	6 455
3ω＋2ω	20.5＋3	4	2 105
	20.5＋6	5	2 517
	20.5＋9	1.5	4 029
	20.5＋12	3.5	5 134
3ω＋1ω	20.5＋5	4.5	1 903
	20.5＋10	4	2 480
	20.5＋15	3	2 507
	20.5＋20	8.5	3 701

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表 3 3ω＋2ω同时辐照下熔石英的损伤增长几率

Table 3. Damage growth probability of fused silica irradiated by 3ω and 2ω simultaneously

No.	3ω energy density/(J·cm⁻²)	2ω energy density/(J·cm⁻²)	damage growth probability/%
1	4.4	2.4	0
2	5	0	0
3	5	1.2	0
4	5	2.4	5
5	6	0	0
6	6	1.2	11
7	6	2.4	17
8	6.5	0	13
9	6.5	1.2	18
10	6.5	2.4	26

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表 4 3ω＋1ω同时辐照下熔石英的损伤增长几率

Table 4. Damage growth probability of fused silica irradiated by 3ω and 1ω simultaneously

No.	3ω energy density/(J·cm⁻²)	1ω energy density/(J·cm⁻²)	damage growth probability/%
1	4.4	2.4	0
2	5	0	0
3	5	1.2	0
4	5	2.4	0
5	6	0	0
6	6	1.2	0
7	6	2.4	7
8	6	3.6	12
9	6.5	0	10
10	6.5	1.2	14
11	6.5	2.4	20

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