Three-dimensional nonstationary calculation of Quasi-phase-matched guided-wave, second-harmonic generation using weighted-index method

1992 ◽  
Vol 75 (5) ◽  
pp. 44-53
Author(s):  
Kazunori Yanagawa ◽  
Kazuya Hayata ◽  
Masanori Koshiba
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Three Dimensional ◽  
Guided Wave ◽  
Index Method ◽  
Weighted Index

scholarly journals Second Harmonic Generation of Guided Wave at Crack-Induced Debonding in FRP-Strengthened Metallic Plates

2018 ◽  
Vol 19 (01) ◽  
pp. 1940006 ◽  
Author(s):  
Yi Yang ◽  
Ching-Tai Ng ◽  
Andrei Kotousov
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Incident Wave ◽  
Second Harmonic ◽  
Three Dimensional ◽  
Wave Interaction ◽  
Guided Wave ◽  
Fe Model ◽  
Nonlinear Guided Wave ◽  
Metallic Plates

The use of fiber-reinforced polymer (FRP) has been widely recognized to be an effective and economical way to strengthen existing structures or repair damaged structures for extending their service life. This study investigates the feasibility of using nonlinear guided wave to monitor crack-induced debonding in FRP-strengthened metallic plates. The study focusses on investigating the nonlinear guided wave interaction with the crack-induced debonding. A three-dimensional (3D) finite element (FE) model is developed to simulate the crack-induced debonding in the FRP-strengthened metallic plates. The performance of using fundamental symmetric ([Formula: see text] and anti-symmetric ([Formula: see text] modes of guided wave as incident wave in the second harmonic generation at the crack-induced debonding is investigated in detail. It is found that the amplitude of the second harmonic and its variation with different damage sizes are very different when using [Formula: see text] and [Formula: see text] guided wave as the incident wave, respectively. The results suggest that it is possible to detect potential damage and distinguish its type based on the features of the generated second harmonic.

Numerical study of the second harmonic generation in FELs

2021 ◽  
Vol 28 (3) ◽  
Author(s):  
A. M. Kalitenko
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Free Electron ◽  
Numerical Study ◽  
Second Harmonic ◽  
Three Dimensional ◽  
X Ray ◽  
Linac Coherent Light Source ◽  
The Individual ◽  
Analytical Expressions

A numerical study of the effect of betatron oscillations on the second harmonic generation in free-electron lasers (FELs) is presented. Analytical expressions for the effective coupling strength factors are derived that clearly distinguish all contributions in subharmonics and each polarization of the radiation. A three-dimensional time-dependent numerical FEL code that takes into account the main FEL effects and the individual contribution of each electron to the second harmonic generation is presented. Also, the X- and Y-polarizations of the second harmonic are analyzed. The second harmonic was detected in experiments at the Advanced Photon Source (APS) Low Energy Undulator Test Line (LEUTL) and Linac Coherent Light Source (LCLS) in the soft X-ray regime. The approach presented in the article can be useful for a comprehensive study and diagnostics of XFELs. In the paper, the LCLS and Pohang Accelerator Laboratory X-ray Free-Electron Laser (PAL-XFEL) experiments are modeled. The simulation results are in a good agreement with the experimental data.

scholarly journals Na4Yb(CO3)3F: A New UV Nonlinear Optical Material with a Large Second Harmonic Generation Response

Crystals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 381
Author(s):  
Qiaoling Chen ◽  
Min Luo ◽  
Chensheng Lin
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Diffuse Reflectance ◽  
Second Harmonic ◽  
Three Dimensional ◽  
One Dimensional ◽  
Nonlinear Optical Crystals ◽  
3D Network ◽  
3D Framework

A new nonlinear optical crystals fluoride carbonate, Na4Yb(CO3)3F, has been synthesized by mild hydrothermal method. The Na4Yb(CO3)3F crystallizes in the noncentrosymmetric space group Cc (no. 9) with the lattice parameters a = 8.018(3), b = 15.929(5), c = 13.950(5) Å and β = 101.425(6)°. The compound Na4Yb(CO3)3F has a high density of [CO3] groups. The structure can be described as one-dimensional [Na5Yb(CO3)2F2] chains connected by [CO3] groups, forming an intricate three-dimensional (3D) framework. Other Na+ and Yb3+ cations are located in the cavities of 3D network. The powder second harmonic generation (SHG) measurement shows that Na4Yb(CO3)3F features a large SHG response, about 4.3 times that of KH2PO4 (KDP), and is a phase-matchable material. In addition, its UV-Vis-NIR diffuse reflectance spectral data indicate that Na4Yb(CO3)3F has a large optical gap about 4.72 eV, which corresponds to the UV cut-off edge of 263 nm.

scholarly journals Monitoring Fibrous Scaffold Guidance of Three-Dimensional Collagen Organisation Using Minimally-Invasive Second Harmonic Generation

PLoS ONE ◽  
2014 ◽  
Vol 9 (2) ◽  
pp. e89761 ◽  
Author(s):  
Robin M. Delaine-Smith ◽  
Nicola H. Green ◽  
Stephen J. Matcher ◽  
Sheila MacNeil ◽  
Gwendolen C. Reilly
Keyword(s):  
Minimally Invasive ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Three Dimensional ◽  
Fibrous Scaffold ◽  
Collagen Organisation
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