Method for increasing bandwidth of quasi-phase matching frequency multiplication conversion

A technology of quasi-phase matching and frequency doubling conversion, applied in nonlinear optics, instruments, optics, etc., to achieve the effect of improving the second harmonic conversion bandwidth

Active Publication Date: 2016-05-11
NANJING UNIV OF POSTS & TELECOMM
View PDF1 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, each technology has certain limitations, so the problem of high...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for increasing bandwidth of quasi-phase matching frequency multiplication conversion
  • Method for increasing bandwidth of quasi-phase matching frequency multiplication conversion
  • Method for increasing bandwidth of quasi-phase matching frequency multiplication conversion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The following is a description of the preferred examples of the present invention. It should be understood that the preferred examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0019] The invention starts from the quasi-phase matching technology and the principle of group velocity matching, uses non-periodically polarized crystals, and aims to obtain wider frequency-doubling second harmonic conversion bandwidth. In the following, the non-periodic poled lithium niobate crystal is taken as the optimal embodiment for description.

[0020] In order to obtain the optimal structure of the non-periodically polarized lithium niobate crystal in the present invention, the present invention adopts a genetic algorithm optimization method, which encodes the problem to be optimized in the form of chromosomes to form a solution to the problem The population, by imitating the theory of biological...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for increasing the bandwidth of quasi-phase matching frequency multiplication conversion. A crystal used in the method is provided with a non-period structure, multi-wavelength frequency multiplication conversion can be achieved at the same time, and the crystal meets quasi-phase matching and group velocity matching conditions at the same time within a specific wavelength range. The optimal structure of the crystal is obtained through a genetic algorithm. The preference structure of the crystal is a non-period polarized lithium niobate crystal, the crystal is in a cuboid shape, the upper surface and the lower surface are parallel and are polished, the crystal is uniformly divided into unit domains with the equal length in the light wave propagation direction, the spontaneous polarization direction of each unit domain is selected to be upward or downward, and the unit domains with a few continuous signals being the same form one positive domain or one negative domain. According to the method, the quasi-phase matching and group velocity matching conditions are met at the same time, higher and smooth conversion efficiency is kept within a certain specific wavelength range, the bandwidth of the frequency multiplication conversion can be increased, and the method has great theoretical and practical significance.

Description

technical field [0001] The invention relates to a method for improving the bandwidth of quasi-phase matching frequency multiplication conversion. Background technique [0002] The second-order nonlinear optical effects, such as frequency doubling, sum frequency, difference frequency and optical parametric oscillation, have always been the research hotspots of nonlinear optics. Using the second-order nonlinear coefficient of the material, second-order nonlinear processes such as frequency conversion can be realized. However, since the propagation speeds of the fundamental wave and the harmonic wave in the material are inconsistent, it will cause phase mismatch and reduce the conversion efficiency [Ye Peixian, nonlinear optics, China Science and Technology Press, Beijing, 1999.]. Taking optical doubling as an example, the frequency of the fundamental wave is ω, the frequency of the second harmonic is 2ω, and the refractive indices of the fundamental wave and the second harmon...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G02F1/35G02F1/355G02F1/37
CPCG02F1/3544G02F1/3558G02F1/37G02F1/3548
Inventor 蒋建张建东肖璇王凯陆云清王瑾
Owner NANJING UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap