The Energy Density and Treatment Times Are the Main Factors That Affect the Efficacy of Long-Pulsed 1,064-nm Nd:YAG Laser Treatment for Onychomycosis Caused by Trichophyton rubrum

Dermatology ◽  
2018 ◽  
Vol 234 (3-4) ◽  
pp. 105-111 ◽  
Author(s):  
Chao Liu ◽  
Ling Zhang ◽  
Hai-Yan Zeng ◽  
Hong Bei ◽  
Shi-Ping Chen ◽  
...  
Keyword(s):  
Energy Density ◽  
Laser Treatment ◽  
Nd:Yag Laser ◽  
Trichophyton Rubrum ◽  
Main Factors

scholarly journals Effects of Co2 and Nd:YAG Laser Remelting of the Ti6Al4V Alloy on the Surface Quality and Residual Stresses

2020 ◽  
Vol 20 (1) ◽  
pp. 82-90 ◽  
Author(s):  
M. Jażdżewska
Keyword(s):  
Energy Density ◽  
Residual Stresses ◽  
Laser Treatment ◽  
Nd:Yag Laser ◽  
Heating Temperature ◽  
Ti6al4v Alloy ◽  
Surface Cracking ◽  
Nd:Yag Lasers ◽  
Compressive Stresses ◽  
Hardness Increase

AbstractThe titanium alloys are materials susceptible to tribological wear and the laser treatment can be applied in surface treatment processes to obtain for example higher hardness level. From the other side, it is important to take into consideration, that hardness increase that can be connected with cracks. The aim of this research was to investigate the effects of different lasers and the process parameters on the form and level of residual stresses in the Ti6Al4V alloy, which determine the initiation and propagation of cracking. Two lasers were used, the CO2 and Nd:YAG lasers. The specimens were remelted in liquid nitrogen, water or calm air at different pre-heating temperature. The different laser power and scan rates were applied. The increase in energy density increased the number of cracks, the change of an environment and pre-heating affected alo the surface cracking. The cracks observed after remelting with Nd:YAG laser were longer than those observed after treatment with CO2 laser. The compressive stresses after the CO2 laser treatment, and tensile stresses after treatment with the Nd:YAG laser, were found. The appearance of cracks was attributed to an excessive energy density. The different distribution of heat energy inside and around the laser tracks was discussed as the origin of presence either tensile or compressive stresses in the alloy treated with different lasers.

Creation of a pn heterojunction in Hg1−xCdxTe (x ≈ 0.2) by laser annealing

1995 ◽  
Vol 73 (3-4) ◽  
pp. 174-176
Author(s):  
E. Sheregii ◽  
M. Kuźma ◽  
C. Abeynayake ◽  
M. Pociask
Keyword(s):  
Energy Density ◽  
Laser Treatment ◽  
Solid Solutions ◽  
Nd:Yag Laser ◽  
Laser Annealing ◽  
Computer Modelling ◽  
Mass Transportation ◽  
X Ray ◽  
Current Voltage ◽  
Current Voltage Characteristics

A highly photosensitive diode area was created in solid solutions of Hg1−xCdxTe (x ≈ m 0.2) (MCT) without melting its surface. The idea of the possible formation of pn heterojunctions, which was indicated by computer modelling of the mass transportation processes under laser treatment of the MCT, was experimentally realized. MCT samples were irradiated with an Nd:YAG laser having an energy density of 0.7 J cm−2. The presence of a heterojunction on a surface not far below the upper surface has been verified by photovoltaic measurements and X-ray microanalysis as well as by current–voltage characteristics.

Histometric changes and epidermal FGF9 expression in carbon photoenhancer-assisted Nd:YAG laser treatment

2012 ◽  
Vol 25 (4) ◽  
pp. 278-282 ◽  
Author(s):  
Zhenlong Zheng ◽  
Jihyun Kim ◽  
Min Ju Choi ◽  
Boncheol Goo ◽  
Soo Il Chun ◽  
...  
Keyword(s):  
Laser Treatment ◽  
Nd:Yag Laser

MRI-Correlated Morphological Changes after Nd:YAG Laser Treatment of the Human Prostate with the SideFocus® Fiber

1997 ◽  
Vol 59 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Tullio Sulser ◽  
Wolfram Jochum ◽  
Rahel A. Huch Böni ◽  
Philipp U. Heitz ◽  
Gabriel P. Krestin ◽  
...  
Keyword(s):  
Laser Treatment ◽  
Nd:Yag Laser ◽  
Morphological Changes ◽  
Human Prostate

Laser-Triggered Surface Flashover Characteristics of Al2O3 in Pulsed Voltage

2011 ◽  
Vol 354-355 ◽  
pp. 1224-1227
Author(s):  
Ru Zheng Pan ◽  
You Hua Wang ◽  
Min Tang Li ◽  
Ling Ling Pang ◽  
Jue Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
Nd:Yag Laser ◽  
Delay Time ◽  
Laser Energy ◽  
Test System ◽  
Vacuum Condition ◽  
Surface Flashover ◽  
532 Nm ◽  
Time Decrease ◽  
Pulsed Voltage

Based on the platform of laser-triggered surface flashover in pulsed voltage, experiment of laser-triggered surface flashover is carried out in air and vacuum condition with pulsed voltage. A single/double harmonic, with wavelength of 1064/532 nm, Q-switched Nd:YAG laser is applied to trigger the surface flashover. The test system consists of flat electrodes and columned insulator. The material of electrode is copper and the material of insulator is Al2O3. Laser pulse’s wavelengths are 532nm and 1064nm, and laser is focused with rectangle. The results of experiment show that flashover delay time and jitter time decrease with increase of pulsed voltage or laser energy density, the delay time of 1064nm laser trigger is larger than that of 532nm laser trigger, and the delay time and jitter time in vacuum condition are less than the delay time and jitter time in air condition.

Sign in / Sign up

Export Citation Format

Share Document