Generation of microstructures and extreme sub-wavelength laser-induced periodic structures on the Si surface using $$\hbox {N}_{2}$$ nanosecond pulsed laser for the reduction of reflectance

Pramana ◽  
2021 ◽  
Vol 95 (1) ◽  
Author(s):  
P Chandrakanta Singh ◽  
Susanta Kumar Das
Keyword(s):  
Periodic Structures ◽  
Pulsed Laser ◽  
Nanosecond Pulsed Laser ◽  
Sub Wavelength

scholarly journals Direct Laser Processing of Two-Scale Periodic Structures for Superhydrophobic Surfaces Using a Nanosecond Pulsed Laser

2020 ◽  
Vol 7 (4) ◽  
pp. 496-512 ◽  
Author(s):  
Hidenori Shimada ◽  
Shunichi Kato ◽  
Takumi Watanabe ◽  
Masaki Yamaguchi
Keyword(s):  
Contact Angle ◽  
Laser Processing ◽  
Periodic Structures ◽  
Pulsed Laser ◽  
Processing Method ◽  
Superhydrophobic Surfaces ◽  
Processing Rate ◽  
Nanosecond Pulsed Laser ◽  
Direct Laser ◽  
Micro Holes

AbstractHierarchical structures are promising geometries for superhydrophobic surfaces, however a processing method with a single laser light source that is capable of both one-pass and rapid processing has not been established. The purpose of this study was to propose a concept of direct laser processing of two-scale periodic structures exhibiting superhydrophobicity. We hypothesized that the molten material that occurs due to the expanding plasma and that is squeezed around the micro-holes could play an active role in the processing of two-scale periodic structures. Percussion drilling using a nanosecond pulsed laser (532 nm wavelength) was performed on a steel surface. Twenty four different test-pieces were prepared using pitch (16–120 μm), number of repetition shots (1–120), and fluence (2.49–20 J/cm2), as the parameters. As the results, micro-holes with bank-shaped outer rims were formed. The maximum apparent contact angle was 161.4° and the contact angle hysteresis was 4.2° for a pitch of 80 μm and 20 repetition shots. The calculated results for the apparent contact angles were consistent with the measured results. Finally, an equation for estimating the processing rate was proposed. We demonstrated that this direct processing method can achieve a maximum processing rate of 823 mm2/min.

Inside process of glass with nanosecond pulsed laser

2008 ◽  
Author(s):  
Takeji Arai ◽  
Noritaka Asano ◽  
Akihiko Minami ◽  
Hideaki Kusano
Keyword(s):  
Pulsed Laser ◽  
Nanosecond Pulsed Laser

Removal mechanism of surface cleaning on TA15 titanium alloy using nanosecond pulsed laser

2021 ◽  
Vol 139 ◽  
pp. 106998
Author(s):  
Zhichao Li ◽  
Donghe Zhang ◽  
Xuan Su ◽  
Shirui Yang ◽  
Jie Xu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Pulsed Laser ◽  
Surface Cleaning ◽  
Removal Mechanism ◽  
Nanosecond Pulsed Laser ◽  
Ta15 Titanium Alloy

scholarly journals 105 W ultra-narrowband nanosecond pulsed laser at 2 μm based on monolithic Tm-doped fiber MOPA

2015 ◽  
Vol 23 (4) ◽  
pp. 4233 ◽  
Author(s):  
Xiong Wang ◽  
Xiaoxi Jin ◽  
Pu Zhou ◽  
Xiaolin Wang ◽  
Hu Xiao ◽  
...  
Keyword(s):  
Pulsed Laser ◽  
Nanosecond Pulsed Laser
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