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Enhanced thermomechanical stability on laser-induced damage by functionally graded layers in quasi-rugate filters.
- Source :
-
Applied Surface Science . May2018, Vol. 440, p288-293. 6p. - Publication Year :
- 2018
-
Abstract
- Ta 2 O 5 -SiO 2 quasi-rugate filters with a reasonable optimization of rugate notch filter design were prepared by ion-beam sputtering. The optical properties and laser-induced damage threshold are studied. Compared with the spectrum of HL-stacks, the spectrum of quasi-rugate filters have weaker second harmonic peaks and narrower stopbands. According to the effect of functionally graded layers (FGLs), 1-on-1 and S-on-1 Laser induced damage threshold (LIDT) of quasi-rugate filters are about 22% and 50% higher than those of HL stacks, respectively. Through the analysis of the damage morphologies, laser-induced damage of films under nanosecond multi-pulse are dominated by a combination of thermal shock stress and thermomechanical instability due to nodules. Compared with catastrophic damages, the damage sits of quasi-rugate filters are developed in a moderate way. The damage growth behavior of defect-induced damage sites have been effectively restrained by the structure of FGLs. Generally, FGLs are used to reduce thermal stress by the similar thermal-expansion coefficients of neighboring layers and solve the problems such as instability and cracking raised by the interface discontinuity of nodular boundaries, respectively. [ABSTRACT FROM AUTHOR]
- Subjects :
- *COMPOSITE materials
*MATERIALS
*BRAIDED structures
*SHEAR waves
*MICROSTRUCTURE
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 440
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 128275355
- Full Text :
- https://doi.org/10.1016/j.apsusc.2018.01.138