Flexible control over optical reflection property of metallic surfaces via pulse laser

2019 ◽  
Vol 31 (2) ◽  
pp. 022502
Author(s):  
Xiao Luo ◽  
Mingyong Cai ◽  
Weijian Liu ◽  
Changhao Chen ◽  
Rui Pan ◽  
...  
Keyword(s):  
Pulse Laser ◽  
Metallic Surfaces ◽  
Flexible Control ◽  
Optical Reflection ◽  
Reflection Property

Thermo-Elastic Model of Epicenter Displacement by Laser Pulse Irradiated on Metallic Surfaces

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
Thanh Chung Truong ◽  
Ayalsew Dagnew Abetew ◽  
Jung-Ryul Lee ◽  
Jeong-Beom Ihn
Keyword(s):  
Pulse Laser ◽  
Rise Time ◽  
Degrees Of Freedom ◽  
Surface Displacement ◽  
Laser Ultrasonics ◽  
Elastic Model ◽  
Beam Size ◽  
Metallic Surfaces ◽  
Penetration Effect ◽  
Pulse Echo

In recent years, there is a much interest in developing of nondestructive testing (NDT) systems using the pulse-echo laser ultrasonics. The key idea is to combine a low-power and short-pulsewidth laser excitation with a continuous sensing laser; and use a scanning mechanism, such as five degrees-of-freedom (5DOF)-axis robot, laser mirror scanner, or motorized linear translation or rotation scanner stage, to scan the combined beam on the structure. In order to optimize the parameters of the excitation laser, a realistic theoretical model of the epicenter displacement in thermo-elastic regime is needed. This paper revisits and revises the study of Spicer and Hurley (1996, “Epicentral and Near Epicenter Surface Displacements on Pulsed Laser Irradiated Metallic Surfaces,” Appl. Phys. Lett., 68(25), pp. 3561–3563) on thermo-elastic model of epicenter displacement with two new contributions: first, we revised Spicer’s model to take into account the optical penetration effect, which was neglected in Spicer’s model; and second, the revised model was used to investigate the effect of laser rise time and beam size to the epicenter displacement. We showed that a pulse laser with short rise time generates an equivalent surface displacement with a pulse laser with long rise time, except a “spike” at the beginning of the epicenter waveform; also when the laser beam size increases, the epicenter displacement decreases. These two conclusions were then validated by experiments.

scholarly journals Study on Optical Reflection Property from Multilayer on Si Substrate Including Nanoparticles in SiO2 Layer

Shinku ◽  
2003 ◽  
Vol 46 (9) ◽  
pp. 698-702
Author(s):  
Nobutoshi ARAI ◽  
Hiroshi TSUJI ◽  
Masanori MOTONO ◽  
Hiromitsu SUGAWARA ◽  
Takuya MATSUMOTO ◽  
...  
Keyword(s):  
Sio2 Layer ◽  
Si Substrate ◽  
Optical Reflection ◽  
Reflection Property

Evaluation of nanoparticles embedded in thin silicon dioxide film by optical reflection property

2005 ◽  
Vol 196 (1-3) ◽  
pp. 44-49 ◽  
Author(s):  
Nobutoshi Arai ◽  
Hiroshi Tsuji ◽  
Kazuya Ueno ◽  
Takuya Matsumoto ◽  
Yasuhito Gotoh ◽  
...  
Keyword(s):  
Silicon Dioxide ◽  
Silicon Dioxide Film ◽  
Optical Reflection ◽  
Reflection Property ◽  
Thin Silicon ◽  
Dioxide Film
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