Measurement of quadratic electrogyration effect in KDP crystals for light propagating along the optical axis

2019 ◽  
Vol 52 (1) ◽  
pp. 158-167 ◽  
Author(s):  
Marek Izdebski
Keyword(s):  
Optical Axis ◽  
Potassium Dihydrogen Phosphate ◽  
High Sensitivity ◽  
Measurement Procedure ◽  
Measuring System ◽  
Dihydrogen Phosphate ◽  
Kdp Crystal ◽  
Potassium Dihydrogen ◽  
Electro Optic ◽  
Lock In

In this paper, a method of measuring the β31 coefficient of the quadratic electrogyration effect in potassium dihydrogen phosphate (KDP)-type crystals is proposed. It is shown that this very weak effect can be decoupled from other stronger effects occurring simultaneously in the real measuring system, even when small inaccuracies in crystal cutting and alignment are taken into account. Theoretical and numerical analyses are illustrated by experimental data obtained for the KDP crystal. High sensitivity, which is required for successful measurements at room and higher temperatures, has been achieved by using the polarimetric method for a light beam propagating along the optical axis of the crystal in combination with the lock-in technique and a new measurement procedure that compensates for the contribution of other effects such as electro-optic effects, natural birefringence and dichroism. It was found that the β31 coefficient measured at a wavelength of 632.8 nm decreases linearly from 2.53 × 10−21 m2 V−2 at a temperature of 298 K to 2.08 × 10−21 m2 V−2 at 343 K.

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

Effect of optical activity on electro-optic measurements in crystals of the potassium dihydrogen phosphate family

2012 ◽  
Vol 45 (5) ◽  
pp. 950-962 ◽  
Author(s):  
Marek Izdebski
Keyword(s):  
Electric Field ◽  
Optical Activity ◽  
Point Group ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Linear Quadratic ◽  
Potassium Dihydrogen ◽  
Electro Optic ◽  
Effective Coefficients ◽  
New Interpretation

Crystals of the potassium dihydrogen phosphate family in their paraelectric phase belong to point group \overline 4 2m, which allows for natural optical activity and electric field-induced optical activity related to the linear and nonlinear electrogyration effects. This work presents a theoretical analysis of the influence of these effects on measurements of the linear, quadratic and fourth-order electro-optic coefficients. Both the polarimetric technique and a method based on Michelson interferometry are considered. A number of configurations of the light path and the electric field directions were analyzed, and it was found that the influence, when it appears, is usually negligibly small. Thus, no previously reported experimental data need a new interpretation. However, in future measurements of some effective coefficients of the quadratic electro-optic effect using the dynamic polarimetric technique, the contribution of the quadratic electrogyration may no longer be negligible after improving the resolution from 10−21to 10−22 m2 V−2. This work also shows that the quadratic electrogyration described by the β31coefficient may be decoupled from the linear and quadratic electro-optic effects in measurements performed by the polarimetric method.

Research on Deliquescent Polishing Fluid for KDP Crystals

2009 ◽  
Vol 626-627 ◽  
pp. 53-58 ◽  
Author(s):  
Shao Long Guo ◽  
Fei Hu Zhang ◽  
Yong Zhang ◽  
Dian Rong Luan
Keyword(s):  
Removal Rate ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Kdp Crystal ◽  
Potassium Dihydrogen ◽  
Performance Requirements ◽  
Stability Experiment ◽  
Main Components ◽  
Polishing Fluid ◽  
Kdp Crystals

The characteristics and principle of deliquescent polishing technology for potassium dihydrogen phosphate (KDP) crystals are introduced, and the performance requirements of deliquescent polishing fluid for KDP crystals are proposed. The main components of the deliquescent polishing fluid for KDP crystals were selected according to these performance requirements. Through uniformity experiment, stability experiment and fluidity experiment, uniformity, stability and fluidity of deliquescent polishing fluid for KDP crystals prepared using the selected components were tested. Through deliquescent polishing experiment of KDP crystal, polishing performance of deliquescent polishing fluid compounded using the selected components was tested. The material removal rate of the KDP crystal in the deliquescent polishing experiment was 6.03μm/min, and the surface roughness of the KDP crystal after deliquescent polishing was 4.857nm. The experimental results show that the compounded deliquescent polishing fluid for KDP crystals has good polishing performance and can reach the requirements.

Thermodynamics of Potassium Dihydrogen Phosphate Growth: Baseline for Understanding Single-Crystal Formation

2012 ◽  
Vol 581-582 ◽  
pp. 727-730 ◽  
Author(s):  
Xu Zhang ◽  
De Xiang Jia ◽  
Hua Xie
Keyword(s):  
Crystal Growth ◽  
Surface Energy ◽  
Surface Chemistry ◽  
Thermodynamic Description ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Crystal Formation ◽  
Kdp Crystal ◽  
Potassium Dihydrogen ◽  
Effect Of Surface

The geometric shape of a crystal can be simulated via a thermodynamic model using breaking bond energy calculations. When this model was applied to the case of the KDP crystal, a thermodynamic description of the KDP crystal growth was successfully developed, which was consistent with experimental observations. Additionally, the effect of surface chemistry on the morphology of the KDP crystal was also investigated using the model based on the surface energy of the KDP crystal. These results confirm that bond making and breaking strongly influence the thermodynamic morphology of the KDP crystal during the crystallization.

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.

Experimental Researches on Precision Grinding of KDP Crystal

2007 ◽  
Vol 359-360 ◽  
pp. 113-117 ◽  
Author(s):  
Qiang Guo Wang ◽  
Hang Gao ◽  
Quan Zhong Zhang ◽  
Xian Suo Cao ◽  
Ren Ke Kang
Keyword(s):  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Precision Grinding ◽  
Machine Material ◽  
Kdp Crystal ◽  
Potassium Dihydrogen ◽  
Surface Damages ◽  
Feeding Speed ◽  
Experimental Researches

The KDP (Potassium Dihydrogen Phosphate) crystal, used as an important photoelectron part in the laser nuclear fusion system, is a typical kind of hard-to-machine material because of its soft, brittle, anisotropic property and nano-scale requirement for the shape and plane precision. Based on the experiments of the KDP crystal’s grindability, certain process parameters, such as the wheel granularity, the grinding depth and the workpiece’s feeding speed etc., and their influences on the grinding force and the surface roughness of KDP workpiece are analyzed. Furthermore, some KDP crystal’s typical surface damages in grinding are analyzed and some technical approaches to increasing the ultraprecision machining surface quality of KDP crystal are suggested as well.

Sign in / Sign up

Export Citation Format

Share Document