scholarly journals Studies on the temperature and energy dependence of g factor in GaAs by femtosecond laser absorption quantum beats

2006 ◽  
Vol 55 (5) ◽  
pp. 2618
Author(s):  
Xu Hai-Hong ◽  
Jiao Zhong-Xing ◽  
Liu Xiao-Dong ◽  
Lei Liang ◽  
Wen Jin-Hui ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Energy Dependence ◽  
Quantum Beats ◽  
G Factor ◽  
Laser Absorption

ENERGY DEPENDENCE OF THE POLARISATION IN ZERO-FIELD QUANTUM BEATS IN Hβ EMISSION

1979 ◽  
Vol 40 (C1) ◽  
pp. C1-335-C1-337 ◽  
Author(s):  
J. Carmeliet ◽  
J. C. Dehaes ◽  
W. Singer
Keyword(s):  
Energy Dependence ◽  
Quantum Beats ◽  
Zero Field

Demonstration of cavity enhanced FTIR spectroscopy using a femtosecond laser absorption source

2010 ◽  
Vol 75 (1) ◽  
pp. 142-145 ◽  
Author(s):  
S. Kassi ◽  
K. Didriche ◽  
C. Lauzin ◽  
X. de Ghellinck d’Elseghem Vaernewij ◽  
A. Rizopoulos ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Ftir Spectroscopy ◽  
Laser Absorption

scholarly journals Simulation of femtosecond laser absorption by metallic targets and their thermal evolution

2017 ◽  
Vol 35 (3) ◽  
pp. 415-428 ◽  
Author(s):  
A. Suslova ◽  
A. Hassanein
Keyword(s):  
Femtosecond Laser ◽  
Laser Intensity ◽  
Laser Energy ◽  
Absorption Efficiency ◽  
Optical Parameters ◽  
Temperature Dependent ◽  
Simulation Code ◽  
Laser Absorption ◽  
Plasma State ◽  
Wide Range

AbstractThe interaction of femtosecond laser with initially cold solid metallic targets (Al, Au, Cu, Mo, Ni) was investigated in a wide range of laser intensity with focus on the laser energy absorption efficiency. Our developed simulation code (FEMTO-2D) is based on two-temperature model in two-dimensional configuration, where the temperature-dependent optical and thermodynamic properties of the target material were considered. The role of the collisional processes in the ultrashort pulse laser–matter interaction has been carefully analyzed throughout the process of material transition from the cold solid state into the dense plasma state during the pulse. We have compared the simulation predictions of the laser pulse absorption with temperature-dependent reflectivity and optical penetration depth to the case of constant optical parameters. By considering the effect of the temporal and spatial (radial) distribution of the laser intensity on the light absorption efficiency, we obtained a good agreement between the simulated results and available experimental data. The appropriate model for temperature-dependent optical parameters defining the laser absorption efficiency will allow more accurate simulation of the target thermal response in the applications where it is critical, such as prediction of the material damage threshold, laser ablation threshold, and the ablation profile.

Laser energy dependence on femtosecond laser-induced nucleation of protein

2008 ◽  
Vol 93 (4) ◽  
pp. 911-915 ◽  
Author(s):  
Hiroshi Y. Yoshikawa ◽  
Ryota Murai ◽  
Syou Maki ◽  
Tomoya Kitatani ◽  
Shigeru Sugiyama ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Energy Dependence ◽  
Laser Energy

scholarly journals Laser Shock Peening of Ti6Al4V Alloy with Combined Nanosecond and Femtosecond Laser Pulses

Metals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 26
Author(s):  
Rujian Sun ◽  
Guangzhi He ◽  
Hailin Bai ◽  
Jianfeng Yan ◽  
Wei Guo
Keyword(s):  
Femtosecond Laser ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Laser Shock Peening ◽  
Metallic Materials ◽  
Laser Shock ◽  
Laser Absorption ◽  
Shock Peening ◽  
Surface Morphologies ◽  
Equiaxed Grains

Laser shock peening (LSP) with nanosecond or femtosecond laser pulses is applied to improve the mechanical properties of metallic materials. Thus, it is necessary to compare the effects of different processing methods on microstructure changes and property improvement. In this study, nanosecond LSP (NLSP), femtosecond LSP (FLSP), and LSP with combined nanosecond and femtosecond laser pulses (F-NLSP) are conducted on Ti6Al4V alloys to compare the surface morphologies, in-depth microstructures, and nanohardness changes. In FLSP, the peened surface is smooth, and the affected depth is limited near the peened surface. NLSPed and F-NLSPed samples present rough surfaces due to the severe ablation process. Small equiaxed grains with no preferred grain orientation are denser in F-NLSPed samples than that in NLSPed samples. Compared with NLSPed samples, the affected depth and amplitude of in-depth nanohardness are larger in F-NLSPed samples. This is attributed to the increased laser absorption of incident laser on the treated surface by femtosecond laser pulses. The results in this study show the effects of different LSP methods and provide chances in engineering potentials for material property improvements.

Electron spin quantum beats and room temperature g factor in GaAsN

2009 ◽  
Vol 95 (4) ◽  
pp. 041911 ◽  
Author(s):  
H. M. Zhao ◽  
L. Lombez ◽  
B. L. Liu ◽  
B. Q. Sun ◽  
Q. K. Xue ◽  
...  
Keyword(s):  
Electron Spin ◽  
Room Temperature ◽  
Quantum Beats ◽  
G Factor ◽  
Spin Quantum
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