Second-order nonlinearities in the domain walls of periodically poled KTiOPO4

2004 ◽  
Vol 85 (3) ◽  
pp. 375-377 ◽  
Author(s):  
A. Fragemann ◽  
V. Pasiskevicius ◽  
F. Laurell
Keyword(s):  
Domain Walls ◽  
Second Order ◽  
Periodically Poled

scholarly journals Charged Exciton Kinetics in Monolayer MoSe2 near Ferroelectric Domain Walls in Periodically Poled LiNbO3

Nano Letters ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 959-966
Author(s):  
Pedro Soubelet ◽  
Julian Klein ◽  
Jakob Wierzbowski ◽  
Riccardo Silvioli ◽  
Florian Sigger ◽  
...  
Keyword(s):  
Domain Walls ◽  
Ferroelectric Domain ◽  
Periodically Poled ◽  
Charged Exciton

Periodically poled KTA crystal investigated using coherent X-ray beams

2000 ◽  
Vol 33 (4) ◽  
pp. 1149-1153 ◽  
Author(s):  
P. Pernot-Rejmánková ◽  
P. A. Thomas ◽  
P. Cloetens ◽  
F. Lorut ◽  
J. Baruchel ◽  
...  
Keyword(s):  
Phase Difference ◽  
Domain Walls ◽  
Structural Information ◽  
Periodically Poled ◽  
Synchrotron Source ◽  
X Ray ◽  
Diffracted Waves ◽  
Coherent Beams ◽  
Diffraction Imaging ◽  
The Difference

The distribution of inverted ferroelectric domains on the surface and within the bulk of a periodically poled KTA (KTiOAsO4) single crystal has been observed using a simple X-ray diffraction imaging setup which takes advantage of the highly coherent beams available at a third-generation synchrotron source, such as the ESRF. This technique allows one to reveal the phase difference between the waves that are Bragg diffracted from adjacent domainsviafree-space propagation (Fresnel diffraction). The phase difference of the diffracted waves is mainly produced by the difference in phases of the structure factors involved, and contains precise structural information about the nature of the domain walls.

Observation of Periodic Domain Inversion in Periodically Poled LiNbO3 by High-Resolution Topography

1996 ◽  
Vol 29 (3) ◽  
pp. 279-284 ◽  
Author(s):  
Z. W. Hu ◽  
P. A. Thomas ◽  
J. Webjörn
Keyword(s):  
High Resolution ◽  
Structural Model ◽  
Domain Walls ◽  
Periodic Pattern ◽  
Periodic Domain ◽  
Periodically Poled ◽  
Diffraction Mode ◽  
Linear Contrast ◽  
Domain Inversion ◽  
Periodic Domain Inversion

Periodic domain inversion in an electric field poled LiNbO3 crystal has been studied using high-resolution multiple-crystal multiple-reflection X-ray diffraction topography. Fine linear contrast with spacings that correspond to the lateral dimensions of the periodic pattern has been observed by the choice of an appropriate diffraction mode to provide high spatial resolution and is shown to arise essentially from strains at the domain walls. The origin of the strain contrast at the domain walls is suggested primarily to be the result of the domain-inversion processing via the converse piezeoelectric effect. A structural model for the domain inversion that is based on a pseudosymmetry argument is invoked in order to quantify the ionic displacements for twinning. These results are compared with those obtained in a previous study employing a different diffraction mode [Hu, Thomas & Webjörn (1995). J. Phys. D, 28, A189–A194].

scholarly journals Generation of Pure State Photon Triplets in the C-Band

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 775 ◽  
Author(s):  
Xi-Rong Su ◽  
Yi-Wen Huang ◽  
Tong Xiang ◽  
Yuan-Hua Li ◽  
Xian-Feng Chen
Keyword(s):  
Pure State ◽  
Schmidt Number ◽  
Second Order ◽  
Conversion Process ◽  
Gaussian Filter ◽  
Periodically Poled ◽  
Two Photon ◽  
Parametric Down Conversion ◽  
Photon States ◽  
Down Conversion

In this work, the cascaded second-order spontaneous parametric down-conversion (SPDC) is considered to produce pure state photon triplets in periodically poled lithium niobite (PPLN) doped with 5% MgO. A set of parameters are optimized through calculating the Schmidt number of two-photon states generated by each down-conversion process with different pump durations and crystal lengths. We use a Gaussian filter in part and obtain three photons with 100% purity in spectrum. We provide a feasible and unprecedented scheme to manipulate the spectrum purity of photon triplets in the communication band (C-band).

scholarly journals All-optical AND and NAND gates based on cascaded second-order nonlinear processes in a Ti-diffused periodically poled LiNbO3 waveguide

2006 ◽  
Vol 14 (7) ◽  
pp. 2776 ◽  
Author(s):  
Yeung Lak Lee ◽  
Bong-Ahn Yu ◽  
Tae Joong Eom ◽  
Woojin Shin ◽  
Changsoo Jung ◽  
...  
Keyword(s):  
Second Order ◽  
Nonlinear Processes ◽  
Periodically Poled ◽  
All Optical
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