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Non-linear coupling method for achieving intermediate infrared wave band laser source tertiary cascade efficient frequency conversion

A nonlinear coupling, laser light source technology, used in nonlinear optics, optics, instruments, etc.

Active Publication Date: 2016-03-30
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] The purpose of the present invention is to provide a nonlinear coupling method for realizing the three-time cascaded high-efficiency frequency conversion of the mid-infrared band laser light source, which can solve the design modulation method and multiple quasi-phase matching of the coupling strength of the three-time cascaded nonlinear high-efficiency frequency conversion problems, and can obtain a very valuable mid-infrared band laser light source

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  • Non-linear coupling method for achieving intermediate infrared wave band laser source tertiary cascade efficient frequency conversion
  • Non-linear coupling method for achieving intermediate infrared wave band laser source tertiary cascade efficient frequency conversion
  • Non-linear coupling method for achieving intermediate infrared wave band laser source tertiary cascade efficient frequency conversion

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Embodiment Construction

[0060] In this embodiment, a non-linear coupling method for realizing the three-time cascaded high-efficiency frequency conversion of the mid-infrared band laser light source is realized. The high-efficiency three-time cascade conversion from the wavelength of 607nm to the mid-infrared 3800nm ​​is realized through the PPLN crystal. The schematic diagram of the three-time cascade is as follows figure 1 As shown, the specific steps of the coupling method are as follows:

[0061] Select four laser light sources, they are:

[0062] The frequency of the signal light source is ω 1 , the wavelength is 605nm, and the light intensity is 100MW / cm 2 .

[0063] The frequency of pump light source 1 is ω p1 , the wavelength is 1550nm, and the light intensity is 2GW / cm 2 .

[0064] The frequency of the pump light source 2 is ω p2 , the wavelength is 2700nm, and the light intensity is 20GW / cm 2 .

[0065] The frequency of the pump light source 3 is ω p3 , the wavelength is 2900nm, an...

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Abstract

The invention discloses a non-linear coupling method for achieving intermediate infrared wave band laser source tertiary cascade efficient frequency conversion. The method includes the steps that firstly, a laser source and PPLN crystal are selected; secondly, the PPLN crystal is processed to achieve quasi-phase matching when light waves are transmitted in the PPLN crystal; thirdly, the forward and reverse domain widths of the PPLN crystal are set to modulate the constant-volume leap-type coupling strength k12, k23 and k34; fourthly, the coupling strength k12, k23 and k34 are modulated in a Gaussian mode; fifthly, the light waves are converted, and a signal light source is converted into intermediate infrared wave band wavelength. By means of the method, a design modulation method of the coupling strength of tertiary cascade non-linear efficient frequency conversion is provided, the problem of multi-quasi-phase matching can be solved, and an intermediate infrared wave band laser source with high application value can be obtained.

Description

technical field [0001] The invention relates to a laser light source coupling method, in particular to a nonlinear coupling method for realizing triple cascaded high-efficiency frequency conversion of a mid-infrared band laser light source, which is used to generate some mid-infrared band laser light sources with great utilization value. Background technique [0002] The 2-5μm mid-infrared light source has been used in many aspects, and the main method to obtain the mid-infrared light source is the frequency conversion of nonlinear optics, such as OPO, difference frequency conversion, etc. [0003] Nonlinear optics play an important role in the field of frequency conversion and access to new sources of radiation. In the process of wavelength conversion, two beams of light with different frequencies are incident into the nonlinear dielectric material, and a third beam of light will be generated in the form of frequency multiplication (SHG), frequency mixing and cascading. Se...

Claims

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Application Information

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IPC IPC(8): G02F1/355
CPCG02F1/3551
Inventor 陈长水胡辉徐磊杨晓
Owner SOUTH CHINA NORMAL UNIVERSITY
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