Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for generating terahertz waves in non-linear crystal through cascade difference frequency and cavity phase matching by infrared laser

A nonlinear crystal, infrared laser technology, applied in the field of infrared laser, can solve problems such as low conversion efficiency

Inactive Publication Date: 2017-12-01
JIANGXI NORMAL UNIVERSITY
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome a series of problems in the background technology, the present invention provides a method for cascading Nd:YAG lasers in an organic crystal to generate terahertz waves by cavity phase matching with difference frequency. The disadvantage of low conversion efficiency

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 generating terahertz waves in non-linear crystal through cascade difference frequency and cavity phase matching by infrared laser
  • Method for generating terahertz waves in non-linear crystal through cascade difference frequency and cavity phase matching by infrared laser
  • Method for generating terahertz waves in non-linear crystal through cascade difference frequency and cavity phase matching by infrared laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be described in more detail below by means of examples, but the following examples are only illustrative, and the protection scope of the present invention will not be limited by the following examples.

[0024] The invention is based on the fact that two beams of light with different wavelengths pass through the optical second-order nonlinear effect of a nonlinear crystal to generate stable and tunable terahertz waves. In this process, the two beams of pump light and terahertz light with similar wavelengths will simultaneously satisfy the energy conservation condition and the quasi-phase matching condition. In this embodiment, more than 10 orders of cascading and cavity phase matching are used. Optical nonlinear crystals include inorganic nonlinear crystals and organic nonlinear crystals. Inorganic crystals include Gap, GaAs, and ZnGeP 2 , GaSe, LiNbO 3 , KTP, ZnTe, etc. Organic crystals include DSTMS crystals, OH1 crystals, and DAST crystal...

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

PropertyMeasurementUnit
Wavelength rangeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for generating tunable terahertz waves in a non-linear crystal by Nd:YAG laser, and in a cascade effect, an extremely small wave vector phase mismatching amount is maintained in a wide range so that generation conditions of the cascade effect can be satisfied. In the cavity phase matching, the cascade coherence length needs to be minimum to realize generation of high-power terahertz waves. The method for generating the terahertz waves in the non-linear crystal by employing cavity phase matching and cascade difference frequency by the Nd:YAG laser includes steps: 1) generating two beams of stably running tunable infrared laser by employing a Nd:YAG laser capable of directly realizing similar dual-wavelength stable running; 2) enabling the propagation directions of the two beams of infrared laser to be collinear; 3) placing the non-linear crystal on an optical path of the laser beam, wherein the length of the non-linear crystal needs to simultaneously satisfy a cascade effect condition and a cavity phase matching condition; and 4) changing the wavelength variable of two infrared laser beams output by the Nd:YAG laser. According to the method, the generated terahertz waves display wider application prospect in various fields.

Description

technical field [0001] The invention relates to the field of infrared lasers, in particular to a method for generating tunable terahertz waves in an optical nonlinear crystal using an Nd:YAG laser with a multi-level structure and capable of directly realizing similar dual-wavelength stable output. Background technique [0002] Terahertz-wave (THz) wave sources have received great attention as a powerful tool for future high-speed wireless communication, nondestructive evaluation, and medical diagnosis. Terahertz waves usually refer to electromagnetic waves (1THz=10 12 Hz), which lies between microwave and infrared waves in the electromagnetic spectrum. This band is an electromagnetic radiation area that has great scientific research value but has not yet been fully researched and developed. Terahertz science and technology integrates the characteristics of electronics and photonics. The long-wave band overlaps with millimeter waves (sub-millimeter waves), which is mainly e...

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): H01S1/02G02F1/35
CPCG02F1/3544G02F2203/13H01S1/02
Inventor 饶志明黄俊滔
Owner JIANGXI NORMAL UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com