Improving laser damage resistance of 355&#x2009;&#x2009;nm high-reflective coatings by co-evaporated interfaces

Huanbin Xing; Meiping Zhu; Yingjie Chai; Kui Yi; Jian Sun; Yun Cui; Jianda Shao

doi:10.1364/OL.41.001253

Optics Letters
Vol. 41,
Issue 6,
pp. 1253-1256
(2016)
•https://doi.org/10.1364/OL.41.001253

Improving laser damage resistance of 355 nm high-reflective coatings by co-evaporated interfaces

Huanbin Xing, Meiping Zhu, Yingjie Chai, Kui Yi, Jian Sun, Yun Cui, and Jianda Shao

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Huanbin Xing, Meiping Zhu, Yingjie Chai, Kui Yi, Jian Sun, Yun Cui, and Jianda Shao, "Improving laser damage resistance of 355 nm high-reflective coatings by co-evaporated interfaces," Opt. Lett. 41, 1253-1256 (2016)

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Abstract

355 nm high-reflective multilayer coatings with or without coevaporated interfaces (CEIs) were prepared by electron beam evaporation under the same deposition condition. Their transmission spectra, surface roughness, and mechanical stress properties were evaluated. Elemental composition analysis of the multilayer interfaces was performed using x-ray photoelectron spectroscopy, and laser-induced damage thresholds were obtained in both 1-on-1 and 300-on-1 testing modes. The coatings with CEIs reveal a lower mechanical stress and a higher laser damage resistance when irradiated with high laser fluence, and the corresponding damage modeling indicates that CEIs can significantly decrease defect density. The resulting damage morphologies show that CEI coatings can significantly suppress coating delamination and exhibit a “bulk-like” damage behavior, demonstrating better damage performance against high-power lasers.

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Time (days)	CON (MPa)	CEIs (MPa)
10	$- 88.80 \pm 6.10$	$- 61.01 \pm 4.19$
120	$- 79.70 \pm 5.48$	$- 58.80 \pm 4.04$
150	$- 73.88 \pm 5.07$	$- 56.73 \pm 3.90$

	$d_{1}$ $(1 / {mm}^{2})$	$T_{1}$ $(J / {cm}^{2})$	$Δ T_{1}$ $(J / {cm}^{2})$	$d_{2}$ $(1 / {mm}^{2})$	$T_{2}$ $(J / {cm}^{2})$	$Δ T_{2}$ $(J / {cm}^{2})$
${Con}_{1 - on - 1}$	46.8	7.0	2.7	251.2	11.5	4.1
${Con}_{300 - on - 1}$	51.0	6.0	2.3	250.8	8.6	4.1
${CEIs}_{1 - on - 1}$	4.9	7.2	2.7	28.0	12.6	4.0
${CEIs}_{300 - on - 1}$	6.1	5.9	2.5	12.1	7.9	5.1

Time (days)	CON (MPa)	CEIs (MPa)
10	$- 88.80 \pm 6.10$	$- 61.01 \pm 4.19$
120	$- 79.70 \pm 5.48$	$- 58.80 \pm 4.04$
150	$- 73.88 \pm 5.07$	$- 56.73 \pm 3.90$

	$d_{1}$ $(1 / {mm}^{2})$	$T_{1}$ $(J / {cm}^{2})$	$Δ T_{1}$ $(J / {cm}^{2})$	$d_{2}$ $(1 / {mm}^{2})$	$T_{2}$ $(J / {cm}^{2})$	$Δ T_{2}$ $(J / {cm}^{2})$
${Con}_{1 - on - 1}$	46.8	7.0	2.7	251.2	11.5	4.1
${Con}_{300 - on - 1}$	51.0	6.0	2.3	250.8	8.6	4.1
${CEIs}_{1 - on - 1}$	4.9	7.2	2.7	28.0	12.6	4.0
${CEIs}_{300 - on - 1}$	6.1	5.9	2.5	12.1	7.9	5.1

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Optics Letters