Conditions for random and periodic hole formations during surface ablation of silicon with ultrashort pulsed lasers

2015 ◽  
Author(s):  
Matthias Domke
Keyword(s):  
Pulsed Lasers ◽  
Surface Ablation ◽  
Ultrashort Pulsed Lasers

scholarly journals Effects of Pulse Duration and Heat on Laser-Induced Periodic Surface Structures

2020 ◽  
Vol 14 (4) ◽  
pp. 552-559
Author(s):  
Shuhei Kodama ◽  
Keita Shimada ◽  
Masayoshi Mizutani ◽  
Tsunemoto Kuriyagawa ◽  
◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Pulse Duration ◽  
Pulse Laser ◽  
Pulsed Laser ◽  
Laser Wavelength ◽  
Surface Structures ◽  
Pulsed Lasers ◽  
Efficient Technology ◽  
Periodic Surface ◽  
Ultrashort Pulsed Lasers

Compared with traditional nanotexturing methods, an ultrashort-pulsed laser is an efficient technology of fabricating nanostructures called laser-induced periodic surface structures (LIPSS) on material surfaces. LIPSS are easily fabricated when the pulse duration is shorter than collisional relaxation time (CRT). Accordingly, ultrashort-pulsed lasers have been mainly used to study LIPSS, but they unstably irradiate while requiring high costs. Although long-pulsed lasers have low cost and high stability, the phenomena (such as the effect of pulse duration, laser wavelength, and heat) of the LIPSS fabricated using short-pulsed lasers with the pulse duration close to the maximum CRT, which is greater than femtosecond, have not been clarified. However, the nanosecond pulse laser has been reported to produce LIPSS, but those were unclear and ununiform. In this study, the short-pulsed laser with the pulse duration of 20 ps, which is close to the maximum CRT, was employed to clarify the effects of pulse duration and heat on the fabrication of LIPSS and to solve problems associated with ultrashort-pulsed lasers. First, a finite-difference time-domain simulation was developed at 20-ps pulse duration to investigate the effects of irradiation conditions on the electric-field-intensity distribution. Subsequently, experiments were conducted using the 20-ps pulse laser by varying conditions. The aspect ratio of the LIPSS obtained was greater than that of the LIPSS fabricated using ultrashort-pulsed lasers, but LIPSS were not fabricated at 355- and 266-nm laser wavelength. In addition, the short-pulsed laser experienced thermal influences and a cooling material was effective for the fabrication of LIPSS with high-aspect-ratio. This demonstrates the effects of pulse duration close to the CRT and heat on the fabrication of LIPSS.

scholarly journals Simultaneous multi-photon ionization of aromatic molecules in polymer solids with ultrashort pulsed lasers

2009 ◽  
Vol 475 (4-6) ◽  
pp. 240-244 ◽  
Author(s):  
Jiamo Guo ◽  
Tadahiro Togami ◽  
Hiroaki Benten ◽  
Hideo Ohkita ◽  
Shinzaburo Ito
Keyword(s):  
Pulsed Lasers ◽  
Aromatic Molecules ◽  
Photon Ionization ◽  
Ultrashort Pulsed Lasers

X-ray line polarization of He-like Si satellite spectra in plasmas driven by high-intensity ultrashort pulsed lasers

2004 ◽  
Vol 69 (5) ◽  
Author(s):  
Peter Hakel ◽  
Roberto C. Mancini ◽  
Jean-Claude Gauthier ◽  
Emilio Mínguez ◽  
Jacques Dubau ◽  
...  
Keyword(s):  
High Intensity ◽  
Pulsed Lasers ◽  
X Ray ◽  
Ultrashort Pulsed Lasers

scholarly journals Ultrashort Pulsed Lasers – Efficient Tools for Materials Micro-Processing

10.5772/22699 ◽  
2011 ◽  
Author(s):  
Marian Zamfirescu ◽  
Magdalena Ulmeanu ◽  
Alina Bunea ◽  
Gheorghe Sajin ◽  
Razvan Dabu
Keyword(s):  
Pulsed Lasers ◽  
Ultrashort Pulsed Lasers

scholarly journals Microstructural Changes Induced by Ultrashort Pulsed Lasers in Microdrilling of Fuel Nozzles

Procedia CIRP ◽  
2015 ◽  
Vol 33 ◽  
pp. 508-513 ◽  
Author(s):  
L. Romoli ◽  
G. Lovicu ◽  
C.A.A. Rashed ◽  
G. Dini ◽  
M. De Sanctis ◽  
...  
Keyword(s):  
Pulsed Lasers ◽  
Microstructural Changes ◽  
Ultrashort Pulsed Lasers
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