Effect of Laser Energy and Atmosphere on the Emission Characteristics of Laser-Induced Plasmas

1993 ◽  
Vol 47 (10) ◽  
pp. 1659-1664 ◽  
Author(s):  
Mikio Kuzuya ◽  
Hitoshi Matsumoto ◽  
Hideaki Takechi ◽  
Osamu Mikami
Keyword(s):  
Energy Range ◽  
Atmospheric Pressure ◽  
Laser Energy ◽  
Low Energy ◽  
Emission Characteristics ◽  
Yag Laser ◽  
Background Ratio ◽  
High Laser ◽  
High Laser Energy ◽  
Temporal And Spatial

The effects of laser energy and atmosphere on the emission characteristics of laser-induced plasmas were studied with the use of a Q-switched Nd: YAG laser over a laser energy range of 20 to 95 mJ. Argon, helium, and air were used as surrounding atmospheres, and the pressures were changed from atmospheric pressure to 1 Torr. The experimental results showed that the maximum spectral intensity was obtained in argon at around 200 Torr at a high laser energy of 95 mJ, whereas the line-to-background ratio was maximized in helium at around 40 Torr at a low energy of 20 mJ. The results are discussed briefly on the basis of the temporal and spatial observations of the laser-induced plasmas.

High Performance n- and p-channel Strained Single Grain Silicon TFTs using Excimer Laser

2009 ◽  
Vol 1153 ◽  
Author(s):  
Alessandro Baiano ◽  
Ryoichi Ishihara ◽  
Kees Beenakker
Keyword(s):  
High Performance ◽  
Laser Energy ◽  
Silicon Layer ◽  
Silicon Thin Film ◽  
High Laser ◽  
High Laser Energy ◽  
Single Grain ◽  
Czochralski Process ◽  
Low Temperature Process

AbstractIn this paper we investigate the carriers mobility enhancement of the n- and p-channel single-grain silicon thin-film transistors (SG-TFTs) by μ-Czochralski process at low-temperature process (< 350 °C). The high laser energy density nearby the ablation phenomenon that completely melts the silicon layer during the crystallization is responsible for high tensile strain and good crystal quality of the silicon grains, which lead carriers mobility enhancement.

SUPERCONTINUUM SPECTRUM GENERATION IN THE LIQUIDS WITH DIFFERENT BAND GAP THRESHOLDS

2006 ◽  
Vol 15 (04) ◽  
pp. 447-453
Author(s):  
SHIAN ZHANG ◽  
ZHENRONG SUN ◽  
LI DENG ◽  
ZUGENG WANG
Keyword(s):  
Band Gap ◽  
Laser Energy ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Spectral Broadening ◽  
Laser Spectrum ◽  
High Laser ◽  
Supercontinuum Spectrum ◽  
High Laser Energy ◽  
Spectrum Generation

Supercontinuum spectrum generation by femtosecond laser pulses propagating in transparent liquids with different band gap thresholds is investigated. As the laser energy increases, the laser spectrum is strongly broadened and modulated, and finally a supercontinuum spectrum can be observed. The spectral broadening can be mainly attributed to the optical Kerr effect at low laser energy and the plasma created by the multiphoton excitation of electrons from the valence band to the conduction band at high laser energy. It is found that the spectral broadening and modulation strongly depend on the band gap threshold E gap of the medium.

scholarly journals Preparation of Nd-Fe-B/α-Fe nano-composite thick-film magnets on various substrates using PLD with high laser energy density above 10 J/cm2

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 056223
Author(s):  
M. Nakano ◽  
H. Kondo ◽  
A. Yamashita ◽  
T. Yanai ◽  
M. Itakura ◽  
...  
Keyword(s):  
Energy Density ◽  
Thick Film ◽  
Laser Energy ◽  
Laser Energy Density ◽  
Nano Composite ◽  
High Laser ◽  
High Laser Energy

Investigation of Profile Cutting on Glass Plates Using a Pulsed UV Laser System

2011 ◽  
Vol 5 (3) ◽  
pp. 270-276 ◽  
Author(s):  
Shih-Feng Tseng ◽  
◽  
Wen-Tse Hsiao ◽  
Kuo-Cheng Huang ◽  
Chien-Yao Huang ◽  
...  
Keyword(s):  
Laser Energy ◽  
Laser System ◽  
Glass Plate ◽  
Scanning Speed ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Machined Surface ◽  
High Laser ◽  
High Laser Energy ◽  
Glass Plates

A solid-state ultraviolet laser with a circular processing path was used for profile cutting on soda-lime glass plates. Simulation results show that decreasing scanning speed and path spacing and increasing circular processing path frequency yields a smooth cutting edge for the same processing length. Profile glass-plate cutting shows the machined surface with more obvious roughness and numerous microcracks near areas of laser focus than in areas of laser defocusing. This phenomenon is attributed to high laser-energy density and strongly affecting surface roughness.

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