CN206283093U - Seed light injects high power Terahertz difference frequency origin system - Google Patents
Seed light injects high power Terahertz difference frequency origin system Download PDFInfo
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- CN206283093U CN206283093U CN201621276323.4U CN201621276323U CN206283093U CN 206283093 U CN206283093 U CN 206283093U CN 201621276323 U CN201621276323 U CN 201621276323U CN 206283093 U CN206283093 U CN 206283093U
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- terahertz
- light
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- high power
- difference frequency
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Abstract
This patent discloses a kind of seed light injection high power Terahertz difference frequency origin system, and the system includes 1064nm pulse lasers, optical parametric oscillator, seed thz laser device, light beam delay line, optical component (half-wave plate, polarization splitting prism, Terahertz light combination mirror), gallium selenide crystal and Terahertz lens.The patent is based on seed light injection amplification principle, conventional THz wave difference frequency radiation is realized in gallium selenide crystal first with two beam high power near-infrareds pump light source (1064nm lasers and optical parametric oscillator), then seed injection Terahertz realizes high power, the terahertz emission of pole narrow linewidth in this light path.This patent has a simple structure, reliable operation, is easy to operation, and coherence is good, working and room temperature, and can enhanced rad power, pole narrow linewidth, broadband, it is tunable the advantages of.
Description
Technical field
This patent discloses a kind of high power Terahertz difference frequency origin system of seed light injection, specifically refers to introduce extremely narrow seed
In the conventional Terahertz difference frequency origin system of thz beam injection, the characteristic functions such as high power, the radiation of pole narrow linewidth are realized.
Background technology
THz wave (0.1THz-10THz), between millimeter wave and infrared ray, because its unique optical characteristics is (low
Energy property, big bandwidth, non-polar molecule penetrability, fingerprint peakses identity etc.), it is described as " changing ten big key science of future world
One of technology ", has attracted the extensive concern of numerous scientific research personnel, business circles and government department, and its Terahertz Technology will be extensive
Apply on spectrum analysis, imaging, remote sensing, radar, environmental monitoring and Homeland Security.
In numerous terahertz emission sources, existed using the close high power near-infrared nanosecoud pulse laser of two beam wavelength
Method in nonlinear crystal by optical difference frequency produces high power, broadband, narrow linewidth, quasi monochromatic relevant terahertz light
Source, has the advantages that simple structure, working and room temperature, enjoys researcher to pay close attention to.These crystal include gallium selenide, lithium niobate,
Gallium phosphide, GaAs, cadmium telluride, phosphorus germanium zinc and organic crystal DAST, OH1 etc..Nearly ten years, thus development produced by method
Serial Terahertz light source, be largely reported in world periodicals and magazines.
Practical application for following Terahertz Technology, it is necessary to resolve steam in air to the absorption by force of Terahertz this
Problem.Due to there is serial Terahertz transparent window in air, some window bands are wider, but most of frequency range is narrower, now,
Pole narrow linewidth Terahertz frequency range can be selected to be studied.
This patent is that high power narrow linewidth terahertz emission source is studied, during this patent is terahertz emission source
One important research direction, this patent will be widely used in Terahertz Active Imaging, Terahertz remote sensing, Terahertz radar, too
The key areas such as hertz safety check.
The content of the invention
This patent is studied high power narrow linewidth terahertz emission origin system, according to classical high power terahertz optics
The characteristics of difference frequency radiation source (radiant power is high, working and room temperature, and wide scope continuously adjustable etc.), introduce high power pole narrow linewidth
Terahertz electronics continuous radiation source (as seed Terahertz light source) is injected into Terahertz difference frequency system source, participates in terahertz
Hereby the smooth difference frequency of nonlinear crystal three interacts, and reaches and further narrow terahertz emission line width, improves the conversion of Terahertz difference frequency
The purpose of efficiency and terahertz light radiant power.Because seed Terahertz light source has wavelength tuning range wider, this is
Terahertz emission source produced by system also has wavelength tuning range wider.
Particular content is as follows：This patent uses high power narrow linewidth 1064nm ns pulse tuning Qs Nd:YAG laser and
Narrow line-width wavelengths tunable optical parametric oscillator is used as Terahertz difference frequency pumping source.This two beams pump beam is through a series of optics
Element (speculum, half-wave plate, polarization coupled prism), final vertical incidence to gallium selenide plane of crystal, this two light beams laser
Reach space, temporal completely the same coincidence.High power seed thz laser reflexes to gallium selenide through Terahertz light combination mirror
In crystal, and ensure that the seed Terahertz light source incident beam is spatially completely superposed with two beam near-infrared pumping lasers.Selenium
Change gallium crystal to be fixed on a multidimensional adjusting bracket, bottom is equipped with electric rotary table, in that context it may be convenient to carries out grain arrangement angle, bow
The elevation angle is adjusted, and optimal crystalline phase matching angle is reached with this.In the generation process of high power narrow linewidth Terahertz difference frequency radiation source
In, in order to further enhance terahertz emission power, it is necessary to make seed terahertz light centre wavelength, polarization direction and the reality of injection
The terahertz emission wavelength of border Terahertz difference frequency generation, polarization direction are completely the same.
The features such as this patent has simple structure, radiant power high, pole narrow linewidth, broad tuning scope, will promote high power
Terahertz difference frequency source is in fields such as national defense safety, the monitoring of remote radar, remote sensing of the earth, Terahertz communication and scientific researches
Practical application develops.
Brief description of the drawings
Fig. 1 is that seed light injection high power Terahertz difference frequency origin system produces schematic diagram.1 is 1064nm nanosecond lasers in figure
Device；2 is near-infrared half-wave plate；3 is optical parametric oscillator；4 is light beam delay line；5 is near infrared polarization couple prism；6 are
Terahertz light combination mirror；7 is gallium selenide crystal；8 is seed Terahertz light source；9 is the first Terahertz lens；10 is the second Terahertz
Lens；11 is terahertz detector.
Specific embodiment
With reference to Figure of description, specific implementation is carried out to this patent seed light injection high power Terahertz difference frequency origin system and is said
It is bright as follows：
This patent uses high power narrow linewidth 1064nm ns pulse tuning Qs Nd:YAG laser 1 is used as pumping source (frequency
10Hz, pulsewidth 8ns, line width is 0.003cm-1), light beam is using the frequency tripling (355nm) by 1064nm beam pumpings in addition
The narrow linewidth angle tuning optical parametric oscillator 3 of generation is excited, its wavelength tuning range is 400-1700nm, with radiated wave
Continuously adjustabe long, frequency 10Hz, pulsewidth 4ns, narrow linewidth (0.075cm-1), and radiant power high (1070nm nearby highest can
Up to 150mW) the features such as.After 1064nm pump beams are through 1064nm wave bands half-wave plate 2, normal incidence to polarization spectro rib is polarized vertically
Mirror 5；Optical parametric oscillator 3 exports the near infrared light (such as 1070nm wavelength) in 1064nm annex wave bands through light beam delay line 4
Afterwards in vertical incidence to polarization coupled prism 5.Regulation light beam delay line 4, finally makes this two beams near-infrared pumping laser (such as
1064nm laser and 1070nm laser) in beam propagation space, be completely superposed on the time.This two beams pumping laser passes through terahertz
During hereby light combination mirror 6 impinges perpendicularly on gallium selenide crystal 7, carry out Terahertz difference frequency and produce radiation.Seed Terahertz light source 8 is narrow line
Electronics Terahertz continuous source wide, it will provide the continuous laser of high power, narrow linewidth, continuously adjustable, the seed Terahertz
Light is incident to Terahertz light combination mirror 6 after being acted on through the first Terahertz lens 9, and reflexes to gallium selenide crystal 7, in beam propagation
Spatially realize that Terahertz seed light beam is completely superposed with two beam near-infrared pump beams.Because the radiation of Terahertz difference frequency needs completely
The specific crystalline phase matching condition of foot, that is, need precise control crystalline phase matching angle.Therefore gallium selenide in this patent
Crystal 7 is fixed on a multidimensional adjusting bracket, the regulation of the dimensions such as crystal vertical direction, horizontal direction can be met, while bottom
Portion is equipped with electric rotary table, can meet grain arrangement angle, the regulation of pitching angular dimensions.By crystal fine phase matching angle
Regulation, it will produce high-power terahertz radiation.Remaining near-infrared pump in the second actual light path of 10 pairs, Terahertz lens
Pu light beam carries out absorbing and filtering, only allows high power terahertz emission to pass through, and focus to obtain in terahertz detector 11 it is corresponding
Electrical signal, and the reading to terahertz signal is realized by correlation electronics equipment (such as oscillograph, lock-in amplifier).
It is pointed out that during this patent, in order to further enhance Terahertz transformation efficiency caused by seed light injection, it is necessary to
Terahertz polarization direction, Terahertz that polarization direction, Terahertz wavelength and the actual Terahertz difference frequency for injecting seed light are produced
Wavelength is consistent completely.
Optical element function declaration is as follows in system：
1 is 1064nm nanosecond lasers, there is provided the high power near-infrared pumping source required for Terahertz difference frequency source；
2 is near-infrared half-wave plate, changes 1064nm light polarization directions；
3 is optical parametric oscillator, there is provided another wavelength pump beam required for Terahertz difference frequency source；
4 be light beam delay line, by 4 speculum groups into light beam reflection delay light path constitute, time delay is about 4ns；
5 is near infrared polarization couple prism, and 1064nm light beams and optical parametric oscillator output beam are coupled into one
Shu Guang；
6 is Terahertz light combination mirror, and seed thz laser and two beam near-infrared pumping lasers are closed beam to gallium selenide crystal
In；
7 is gallium selenide crystal, realizes seed light injection Terahertz difference frequency radiation.
8 is seed Terahertz light source, specially high power narrow linewidth electronics terahertz sources source, will be using the U.S.
Virginia Diodes Products；
9 is the first Terahertz lens, using black high-density polyethylene material, for seed thz laser is focused to
In gallium selenide Terahertz crystal；
10 is the second Terahertz lens, using black high-density polyethylene material, for the beam pump beam of absorbing and filtering two,
Thz beam is only allowed to pass through, while terahertz signal light beam is focused on terahertz detector；
11 is terahertz detector, carries out terahertz detection, specially liquid helium refrigeration silicon bolometer.
Claims (1)
1. a kind of seed light injects high power Terahertz difference frequency origin system, including 1064nm nanosecond lasers (1), near-infrared half-wave
Piece (2), optical parametric oscillator (3), light beam delay line (4), near infrared polarization couple prism (5), Terahertz light combination mirror (6),
Gallium selenide crystal (7), seed Terahertz light source (8), the first Terahertz lens (9), the second Terahertz lens (10) and terahertz
Hereby detector (11), it is characterised in that：
Described 1064nm nanosecond lasers (1) shoot laser is incident to polarization spectro rib after being acted on through near-infrared half-wave plate (2)
Mirror (5)；Another wavelength pump light of optical parametric oscillator (3) outgoing, polarization spectro is incident to after being acted on through light beam delay line (4)
In prism (5), two beam near-infrared pump lights being completely superposed in the time, spatially is finally reached；The conjunction beam near-infrared pump light
Through being directly transmitted in gallium selenide crystal (7) after Terahertz light combination mirror (6), seed Terahertz light source (8) outgoing terahertz light
In through the first Terahertz lens (9) and Terahertz light combination mirror (6) back reflection to gallium selenide crystal (7), the final Gao Gong for producing
Rate THz wave is focused in terahertz detector (11) through the second Terahertz lens (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621276323.4U CN206283093U (en) | 2016-11-25 | 2016-11-25 | Seed light injects high power Terahertz difference frequency origin system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621276323.4U CN206283093U (en) | 2016-11-25 | 2016-11-25 | Seed light injects high power Terahertz difference frequency origin system |
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| CN206283093U true CN206283093U (en) | 2017-06-27 |
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| CN201621276323.4U Withdrawn - After Issue CN206283093U (en) | 2016-11-25 | 2016-11-25 | Seed light injects high power Terahertz difference frequency origin system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654837A (en) * | 2016-11-25 | 2017-05-10 | 中国科学院上海技术物理研究所 | Seed light-injected high-power terahertz difference frequency source system |
| CN108680500A (en) * | 2018-03-30 | 2018-10-19 | 莆田学院 | A kind of the terahertz time-domain spectroscopy instrument device and analysis method of miniaturization |
| WO2019117805A1 (en) * | 2017-12-14 | 2019-06-20 | Agency For Science, Technology And Research | An ultra-broadband mid-infrared laser with flat output spectrum |
-
2016
- 2016-11-25 CN CN201621276323.4U patent/CN206283093U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106654837A (en) * | 2016-11-25 | 2017-05-10 | 中国科学院上海技术物理研究所 | Seed light-injected high-power terahertz difference frequency source system |
| CN106654837B (en) * | 2016-11-25 | 2023-05-05 | 中国科学院上海技术物理研究所 | Seed light injection high-power terahertz difference frequency source system |
| WO2019117805A1 (en) * | 2017-12-14 | 2019-06-20 | Agency For Science, Technology And Research | An ultra-broadband mid-infrared laser with flat output spectrum |
| CN108680500A (en) * | 2018-03-30 | 2018-10-19 | 莆田学院 | A kind of the terahertz time-domain spectroscopy instrument device and analysis method of miniaturization |
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Granted publication date: 20170627 Effective date of abandoning: 20230505 |
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