NDLI: Wavelength dependent damage thresholds of a bandpass filter under femtosecond laser irradiation

Content Provider	Springer Nature Link
Author	Zhu, Zhiwu Cheng, Xiangai Xu, Zhongjie Huang, Liangjin Liu, Zejin
Copyright Year	2013
Abstract	Laser induced damage thresholds of a bandpass filter with TiO2/SiO2 coatings are measured, with the laser delivering wavelength tunable, high-repetition rate, and ultrashort pulses. The multiple wavelengths are selected within the transitional region between the filter passband and stopband. A method that scans the sample along the focused laser beam is employed to vary the spot size on the coating and, consequently, change the fluence. The damage is detected by both a CCD camera and by monitoring the transmitted power simultaneously. During the experiment, an increase in the filter transmission was observed prior to damage occurrence. We demonstrate that damage induced on the coating by the high repetition rate, femtosecond pulses is governed by macroscopic thermal behavior rather than by critical free electron density in the conduction band. In addition, the process of energy deposition is determined by intrinsic nature of the coating materials. Further analysis indicates that the thresholds as a function of wavelength are determined by the combination of the properties of TiO2, interference field in the coating stack, and thermal effects. Moreover, we attribute the observed increase in the coating transmission to these thermal effects rather than ionization processes.
Starting Page	1091
Ending Page	1098
Page Count	8
File Format	PDF
ISSN	09478396
Journal	Applied Physics A
Volume Number	111
Issue Number	4
e-ISSN	14320630
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-02-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Condensed Matter Physics Optical and Electronic Materials Nanotechnology Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films Operating Procedures, Materials Treatment
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Science

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