Improvement of the laser-induced damage threshold of oxide/fluoride double stack high reflective coatings at 355nm by introducing interlayers

2013 ◽  
Vol 280 ◽  
pp. 772-775 ◽  
Author(s):  
Xu Li ◽  
Jie Liu ◽  
Yongqiang Hou ◽  
Kai He ◽  
Weili Zhang ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Laser Induced Damage ◽  
Reflective Coatings

Laser-induced damage threshold study on TiO2/SiO2 multilayer reflective coatings

2019 ◽  
Vol 94 (1) ◽  
pp. 105-115
Author(s):  
S. Kumar ◽  
A. Shankar ◽  
N. Kishore ◽  
C. Mukherjee ◽  
R. Kamparath ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Laser Induced Damage ◽  
Reflective Coatings

scholarly journals Substrate Cleaning Processes and Their Influence on the Laser Resistance of Anti-Reflective Coatings

2020 ◽  
Vol 10 (23) ◽  
pp. 8496
Author(s):  
Thomas Gischkat ◽  
Daniel Schachtler ◽  
Igor Stevanovic ◽  
Zoltan Balogh-Michels ◽  
Roelene Botha ◽  
...  
Keyword(s):  
Particle Density ◽  
Ion Beam ◽  
Damage Threshold ◽  
Fused Silica ◽  
Limiting Factors ◽  
Laser Damage ◽  
Angle Of Incidence ◽  
Laser Induced Damage ◽  
Reflective Coatings ◽  
Substrate Cleaning

Substrate cleaning prior to coating has a strong influence on the performance of the optical component. Exemplary, none or inadequate cleaning reduces the resistance against laser irradiation drastically. Especially in laser components coated with anti-reflective layers, the interface between substrate and coating is one of the most limiting factors. This study investigates different precision cleaning processes and their influence on the laser resistance of ion-beam sputtered anti-reflective coatings. Therefore, a SiO2/Ta2O5 multilayer anti-reflective coating for a wavelength of 1064 nm and a normal angle of incidence was deposited onto high-quality fused silica substrates. Prior to deposition, the substrates were cleaned with various cleaning processes using different solutions and ultrasonic frequencies. To characterize the cleaned surface quality, the surfaces were analyzed with respect to root-mean-square (RMS) roughness and particle density. Laser damage was measured using a 1064 nm ns-pulsed laser test bench. It was found that an alcoholic pre-clean is recommendable to prevent laser damage caused by organic films remaining from the polishing process. The applied ultrasonic frequencies strongly influenced the particle density down to the sub-micrometer range and in consequence, the laser-induced damage threshold (LIDT). Ultrasonic cleaning at excessive power levels can reduce laser resistance.

Dual wavelength laser-induced damage threshold measurements of alumina/silica and hafnia/silica ultraviolet antireflective coatings

2015 ◽  
Vol 55 (1) ◽  
pp. 104 ◽  
Author(s):  
Marius Mrohs ◽  
Lars Jensen ◽  
Stefan Günster ◽  
Thimotheus Alig ◽  
Detlev Ristau
Keyword(s):  
Damage Threshold ◽  
Dual Wavelength ◽  
Antireflective Coatings ◽  
Dual Wavelength Laser ◽  
Laser Induced Damage
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