scholarly journals Spot-size and incident angle dependence of filtering characteristics of narrow pass-band dielectric multilayer filters

2004 ◽  
Vol 1 (14) ◽  
pp. 442-446 ◽  
Author(s):  
Satoshi Suda ◽  
Fumio Koyama
Keyword(s):  
Incident Angle ◽  
Spot Size ◽  
Pass Band ◽  
Angle Dependence ◽  
Multilayer Filters ◽  
Dielectric Multilayer

scholarly journals Optical monitoring of nonquarterwave layers of dielectric multilayer filters using optical admittance

2006 ◽  
Vol 14 (6) ◽  
pp. 2473 ◽  
Author(s):  
Byung Chun ◽  
Chang Kwon Hwangbo ◽  
Jong Sup Kim
Keyword(s):  
Optical Monitoring ◽  
Multilayer Filters ◽  
Dielectric Multilayer

Measurement of the Incident Angle Dependence of muon flux and Calculation Using Simulation

2021 ◽  
Vol 71 (3) ◽  
pp. 255-262
Author(s):  
Hyeongjoon LEE ◽  
Hanul YOUN ◽  
Jinjoo SEO* ◽  
MinJung KWEON ◽  
Jin-Hee YOON
Keyword(s):  
Incident Angle ◽  
Muon Flux ◽  
Angle Dependence

scholarly journals Nanosecond Laser Etching of Aluminum-Plated Composite Materials Applied to Frequency Selective Surfaces

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2808
Author(s):  
Jian Cheng ◽  
Shufeng Jing ◽  
Deyuan Lou ◽  
Qibiao Yang ◽  
Qing Tao ◽  
...  
Keyword(s):  
Composite Materials ◽  
Laser Pulse ◽  
Focal Spot ◽  
Incident Angle ◽  
Spot Size ◽  
Nanosecond Laser ◽  
Frequency Selective Surfaces ◽  
Laser Etching ◽  
Focal Spot Size ◽  
Frequency Selective

High-quality frequency selective surfaces (FSSs) are important for electromagnetic signal absorption/filtration. Usually, they are made from wave-transparent composite materials covered with a thin metal layer. Current machining methods show some disadvantages when performing fabrication on the structure. Based on its flexibility and uncontactable processing characteristics, nanosecond laser etching of aluminum-plated composite materials applied to FSSs was investigated. To observe the influence of the laser light incident angle, etching of a series of square areas with different incident angles was performed. Thereafter, an image processing method, named the image gray variance (IGV), was employed to perform etching quality evaluation analysis. The observed microscopic pictures of experimental samples were consistent with those of the IGV evaluation. The potential reasons that might affect the etching quality were analyzed. Following all the efforts above, an incident angle range of ±15° was recommended, and the best etching result was obtained at the incident angle of 10°. To observe the influence of the laser pulse overlap and focal spot size on the etched area border uniformity and on the potential damage to the base materials, a theoretical equation was given, and then its prediction of area border edge burrs fluctuation was compared with the experiments. Furthermore, SEM pictures of etched samples were examined. Based on the study, a processing window of the laser pulse overlap and focal spot size was recommended. To conclude, optimal etching results of the FSS materials could be guaranteed by using the right laser operating parameters with the nanosecond laser.

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