Light Field Intensification in Optical Films Induced by Intercoupling of Defects and Organic Contamination.

Xin Chen,Ji Liu,Xiao-Feng Liu,Xiu-Lan Ling

doi:10.3390/mi13030387

Abstract

Based on the finite-difference time-domain method, light field intensification in optical films due to the intercoupling of defects and organic contamination was analyzed. The results show that the intercoupling between the defect and the organic contamination droplet leads to an increase in the local electric field and the coupling effect enhances with the decreasing distance between the defect and the organic contamination droplet and the increasing diameter of the organic contamination droplet. The coupling effect of the defect and the organic contamination layer depends on not only the thickness of the organic contamination layer but also the refractive index of the organic contamination layer. With the thickness and the refractive index of the organic contamination layer increasing, the peak value of the electric field decreases. This work deepens the physical understanding of the degradation mechanism of laser-induced damage in optical thin films used in vacuum.

Highlights

Nowadays, optical films are being widely used in vacuum environments due to the development of laser technology used in vacuum and space [1–3]
2 shows inour the of enhanced field, a leading to laserindex damage, we mainly focusedthat on in simulation electric. These defects were oxide defects in termsof of the chemical nature to optical film, the maximum field was located on the surface ideal
We firstly analyzed the local layer, whereas the peak intensity of the electric field lodged on the boundary of the defect light field enhancement of TiO2 optical films induced by a single non-absorbing spherical and a light field intensification as large as nm

Summary

Introduction

Optical films are being widely used in vacuum environments due to the development of laser technology used in vacuum and space [1–3]. Laser-induced damage degradation in closed vacuum environments is mainly attributed to organic outgassing contaminants depositing on the surface of optical thin films [7–9]. A light field model has been presented to investigate the laser-induced of TiO2 optical films on a k9 substrate due to the intercoupling of defects and Micromachinesdamage. In the presence of data reported in previous and deepens thedependence physical understanding thefield laserthe organicworks contamination layer, the of the coupling of light enhancement induced degradation mechanism of optical thin films used in vacuum.

The Effect of the Defect on Light Field Intensification

Figure

The Coupling Effect of the 3Defect

The Different Thicknesses of the Organic Contamination Layer

Conclusions