Spectral analysis of the effects of laser wavelength and pulse duration on tempera paints

2010 ◽  
pp. 27-34
Keyword(s):  
Spectral Analysis ◽  
Pulse Duration ◽  
Laser Wavelength

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.

Effect of Laser Wavelength and Pulse Duration on Laser-Light Absorption and Back Reflection

1982 ◽  
Vol 48 (15) ◽  
pp. 1018-1021 ◽  
Author(s):  
C. Garban-Labaune ◽  
E. Fabre ◽  
C. E. Max ◽  
R. Fabbro ◽  
F. Amiranoff ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Light Absorption ◽  
Laser Light ◽  
Laser Wavelength ◽  
Back Reflection

Heterodyne Method for Time Resolved Spectral Analysis of Fast Laser Wavelength Switching

2009 ◽  
Vol 21 (20) ◽  
pp. 1517-1519 ◽  
Author(s):  
J. P. Engelstaedter ◽  
B. Roycroft ◽  
F. H. Peters ◽  
B. Corbett
Keyword(s):  
Spectral Analysis ◽  
Laser Wavelength ◽  
Wavelength Switching ◽  
Time Resolved ◽  
Heterodyne Method

Influence of laser wavelength and pulse duration on processing of crystalline silicon

2008 ◽  
Author(s):  
Oliver Haupt ◽  
Aart Schoonderbeek ◽  
Lars Richter ◽  
Rainer Kling ◽  
Andreas Ostendorf
Keyword(s):  
Pulse Duration ◽  
Crystalline Silicon ◽  
Laser Wavelength

scholarly journals FLASH free-electron laser single-shot temporal diagnostic: terahertz-field-driven streaking

2018 ◽  
Vol 25 (1) ◽  
pp. 26-31 ◽  
Author(s):  
Rosen Ivanov ◽  
Jia Liu ◽  
Günter Brenner ◽  
Maciej Brachmanski ◽  
Stefan Düsterer
Keyword(s):  
Spectral Analysis ◽  
Pulse Duration ◽  
Free Electron ◽  
Free Electron Laser ◽  
Arrival Time ◽  
Single Shot ◽  
Pulse Arrival Time ◽  
Photon Pulse ◽  
Operation Stability ◽  
Pulse Arrival

The commissioning of a terahertz-field-driven streak camera installed at the free-electron laser (FEL) FLASH at DESY in Hamburg, being able to deliver photon pulse duration as well as arrival time information with ∼10 fs resolution for each single XUV FEL pulse, is reported. Pulse durations between 300 fs and <15 fs have been measured for different FLASH FEL settings. A comparison between the XUV pulse arrival time and the FEL electron bunch arrival time measured at the FLASH linac section exhibits a correlation width of 20 fs r.m.s., thus demonstrating the excellent operation stability of FLASH. In addition, the terahertz-streaking setup was operated simultaneously to an alternative method to determine the FEL pulse duration based on spectral analysis. FLASH pulse duration derived from simple spectral analysis is in good agreement with that from terahertz-streaking measurement.

Investigation of damage threshold to TiO2 coatings at different laser wavelength and pulse duration

2008 ◽  
Vol 516 (6) ◽  
pp. 1237-1241 ◽  
Author(s):  
Jianke Yao ◽  
Zhengxiu Fan ◽  
Yunxia Jin ◽  
Yuanan Zhao ◽  
Hongbo He ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Damage Threshold ◽  
Laser Wavelength ◽  
Tio2 Coatings

scholarly journals High power laser interaction with clusters

2001 ◽  
Vol 19 (1) ◽  
pp. 163-168 ◽  
Author(s):  
TARA DESAI
Keyword(s):  
Pulse Duration ◽  
Small Volume ◽  
Bulk Material ◽  
Emission Spectra ◽  
Laser Wavelength ◽  
Gold Clusters ◽  
Laser Interaction ◽  
Aluminum Clusters ◽  
Electrons And Ions ◽  
Bulk Gold

Response of clusters to laser radiation depends on the laser parameters like wavelength, pulse duration, field, and so forth. At moderate laser intensities, I ∼ 1012 W/cm2, using a laser beam of wavelength 1.06 μm and 10-ns pulse duration, we have studied X-ray emission spectra from aluminum clusters of diameter 0.4 μm and gold clusters of 1.25 μm. Aluminum clusters show a different spectra compared to bulk material whereas gold clusters evolve towards bulk gold. Results are analyzed on the basis of cluster dimension, laser wavelength, and pulse duration. At higher laser intensities ≥1018 W/cm2, clusters undergo Coulomb explosion, giving rise to energetic electrons and ions. Here we discuss the possibility of harnessing these energetic particles for heating a small volume of the precompressed DT fuel to ignition condition relevant to fast ignition. Preliminary results are discussed.

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