scholarly journals Suppression of transverse stimulated Raman scattering in large-aperture potassium dihydrogen phosphate crystals by pulse stacking

2019 ◽  
Vol 37 (01) ◽  
pp. 1-4
Author(s):  
Xinmin Fan ◽  
Sensen Li ◽  
Jianxin Zhang ◽  
Xiaodong Huang ◽  
Chunyan Wang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Technical Problem ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Kdp Crystal ◽  
Potassium Dihydrogen ◽  
Suppression Effect ◽  
Large Aperture ◽  
Stimulated Raman

AbstractEffective suppression of transverse stimulated Raman scattering (TSRS) in a large-aperture potassium dihydrogen phosphate (KDP) crystal is an important scientific and technical problem in high-intensity laser research and applications. In this work, a method to suppress TSRS using pulse stacking is proposed. The method suppresses TSRS significantly, with greater numbers of subpulses producing more obvious suppression effects, and the threshold intensity growth rate of the 3ω laser in the KDP crystal reaches up to about 1.9 when the stacked pulse contains four subpulses. This suppression effect is attributed to the fact that the polarization directions of adjacent subpulses are perpendicular to each other. The method can be used to suppress other nonlinear effects, including transverse stimulated Brillouin scattering in large-aperture optical devices and stimulated rotational Raman scattering in long air paths.

scholarly journals Using polarization control plate to suppress transverse stimulated Raman scattering in large-aperture KDP crystal

2018 ◽  
Vol 36 (4) ◽  
pp. 454-457 ◽  
Author(s):  
Xinmin Fan ◽  
Sensen Li ◽  
Xiaodong Huang ◽  
Jianxin Zhang ◽  
Chunyan Wang ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Dihydrogen Phosphate ◽  
Inertial Confinement ◽  
Kdp Crystal ◽  
Polarization Control ◽  
Large Aperture ◽  
Control Plate ◽  
Stimulated Raman

AbstractTransverse stimulated Raman scattering (TSRS) is strongly generated in the third-harmonic-generation crystal potassium dihydrogen phosphate (KDP) and can even damage the KDP crystal in inertial confinement fusion drivers. In this work, a method to suppress TSRS is proposed in which the polarization control plate (PCP) is moved to a new position in the existing optical path. The proposed method can suppress TSRS significantly and doubles the laser threshold intensity in KDP crystal when the order of the PCP is 16. This result is attributed to the reduction of the gain length for the Stokes radiation. The proposed method may also be used to suppress other nonlinear effects, including transverse stimulated Brillouin scattering in large-aperture optical components.

Risk Evaluation of Transverse Stimulated Raman Scattering in Large-Aperture, High Fluence KDP Crystal

2011 ◽  
Vol 38 (5) ◽  
pp. 0502011
Author(s):  
王静 Wang Jing ◽  
张小民 Zhang Xiaomin ◽  
李富全 Li Fuquan ◽  
韩伟 Han Wei ◽  
李恪宇 Li Keyu ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Risk Evaluation ◽  
Stimulated Raman Scattering ◽  
High Fluence ◽  
Kdp Crystal ◽  
Large Aperture ◽  
Stimulated Raman

scholarly journals Elastic-plastic-brittle transitions of potassium dihydrogen phosphate crystals: characterization by nanoindentation

2020 ◽  
Vol 8 (4) ◽  
pp. 447-456
Author(s):  
Yong Zhang ◽  
Ning Hou ◽  
Liang-Chi Zhang ◽  
Qi Wang
Keyword(s):  
Plastic Deformation ◽  
Brittle Fracture ◽  
Optical Switching ◽  
Potassium Dihydrogen Phosphate ◽  
Machining Process ◽  
Fracture Mechanisms ◽  
Dihydrogen Phosphate ◽  
Kdp Crystal ◽  
Potassium Dihydrogen ◽  
Kdp Crystals

AbstractPotassium dihydrogen phosphate (KDP) crystals are widely used in laser ignition facilities as optical switching and frequency conversion components. These crystals are soft, brittle, and sensitive to external conditions (e.g., humidity, temperature, and applied stress). Hence, conventional characterization methods, such as transmission electron microscopy, cannot be used to study the mechanisms of material deformation. Nevertheless, understanding the mechanism of plastic-brittle transition in KDP crystals is important to prevent the fracture damage during the machining process. This study explores the plastic deformation and brittle fracture mechanisms of KDP crystals through nanoindentation experiments and theoretical calculations. The results show that dislocation nucleation and propagation are the main mechanisms of plastic deformation in KDP crystals, and dislocation pileup leads to brittle fracture during nanoindentation. Nanoindentation experiments using various indenters indicate that the external stress fields influence the plastic deformation of KDP crystals, and plastic deformation and brittle fracture are related to the material’s anisotropy. However, the effect of loading rate on the KDP crystal deformation is practically negligible. The results of this research provide important information on reducing machining-induced damage and further improving the optical performance of KDP crystal components.

scholarly journals Novel abrasive-free jet polishing mechanism for potassium dihydrogen phosphate (KDP) crystal

2018 ◽  
Vol 8 (4) ◽  
pp. 1012 ◽  
Author(s):  
Wei Gao ◽  
Lili Wang ◽  
Lunfu Tian ◽  
Pengfei Sun ◽  
Hui Dong ◽  
...  
Keyword(s):  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Kdp Crystal ◽  
Potassium Dihydrogen ◽  
Free Jet

A Study of Potassium Dihydrogen Phosphate (KDP) Crystal Surfaces by XPS

2001 ◽  
Vol 8 (1) ◽  
pp. 56-80 ◽  
Author(s):  
Mark Engelhard ◽  
Cheryl Evans ◽  
T. A. Land ◽  
A. J. Nelson
Keyword(s):  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Crystal Surfaces ◽  
Kdp Crystal ◽  
Potassium Dihydrogen
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