CN109586145A - The method of double-colored THz source and its double-colored terahertz pulse of output - Google Patents
The method of double-colored THz source and its double-colored terahertz pulse of output Download PDFInfo
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- CN109586145A CN109586145A CN201811607503.XA CN201811607503A CN109586145A CN 109586145 A CN109586145 A CN 109586145A CN 201811607503 A CN201811607503 A CN 201811607503A CN 109586145 A CN109586145 A CN 109586145A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S1/00—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range
- H01S1/02—Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range solid
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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Abstract
The invention discloses a kind of methods of double-colored THz source and its double-colored terahertz pulse of output, in technical solution of the present invention, the laser pulse width that laser pulse train forming module can be exported based on light source module, form third laser pulse, the third laser pulse includes the ultrashort laser pulse string of multiple and different frequency subpulse strings, and then can make Terahertz that the double-colored terahertz light of module output occur is the double-colored terahertz pulse for including two different subpulses of frequency.
Description
Technical field
The present invention relates to ultra-fast optical and femtosecond laser technology fields, more specifically, being related to a kind of double-colored THz source
And its method of the double-colored terahertz pulse of output.
Background technique
Terahertz wave band refers to frequency in the electromagnetic wave of 0.1-10THz, since it is with penetrability, low photon energy, height
Bandwidth, spectrum fingerprint characteristic, ultrafast characteristic many advantages, such as and unique advantage, for material property research, imaging, biomedicine and
The fields such as astronomy meaning is very great.
TPTP (THz pump/THz probe) is carried out using Terahertz to measure, and is shaken for such as carrier dynamics, magnetic
The particle dynamic collective behavior that the characteristic responses such as resonance, the loss of electronics transient state of son fall in terahertz wave band has unique identification
The understanding of ability, research and deep physical mechanism hence for functional material feature physical property is particularly significant.TPTP measurement
Basic model is using the homologous terahertz light of two beams, wherein a branch of be used for ultrafast excitation, another ultrafast detection of Shu Jinhang.With TPTP
Measurement is applied to for the non-linear THz induction carrier dynamics research of condensed state matter, and THz pump light can excite doping
Semiconductor conduction band electronics, and homologous THz detection light is then used for the characteristic of probe field induction carrier.
The existing THz source for TPTP measurement is mostly single-frequency THz source, i.e. the frequency one of pump light and detection light
It causes, adjustability is poor.
Summary of the invention
In view of this, technical solution of the present invention provides a kind of double-colored THz source and its double-colored terahertz pulse of output
Method, can make Terahertz that the double-colored terahertz light of module output occur is include two different subpulses of frequency double-colored
Terahertz pulse.
To achieve the goals above, the invention provides the following technical scheme:
A kind of double-colored THz source, the double-colored THz source include:
Light source module, the light source module are used for output laser pulse；
Laser pulse train forming module, the laser pulse train forming module are used for the laser for exporting the light source module
Pulse carries out chirp spread, forms two-way chirped pulse, carries out beat frequency to two-way chirped pulse respectively, and being formed includes ultrashort laser
The first laser pulse of subpulse string and second laser pulse including ultrashort laser subpulse string, by the first laser arteries and veins
Beam is closed in punching and the second laser pulse, forms third laser pulse, the third laser pulse includes multiple and different frequencies
The ultrashort laser pulse string of subpulse string；
Module occurs for Terahertz, and the Terahertz occurs module and is used to be based on the double-colored terahertz of third pulsed laser output
Hereby light.
Preferably, in above-mentioned double-colored THz source, the laser pulse train forming module includes:
Chirp spread unit, the laser pulse that the chirp exhibition unit is used to export the light source module carry out chirp exhibition
Width exports chirped pulse；
Beam splitting unit, the beam splitting unit are used to the chirped pulse that the chirp spread unit exports being divided into two-way chirp
Pulse；
First beat frequency unit and the second beat frequency unit, what the first beat frequency unit was used to export the beam splitting unit
Chirped pulse carries out beat frequency all the way, and output includes the first laser pulse of ultrashort laser subpulse string；The second beat frequency unit
Another way chirped pulse for exporting to the beam splitting unit carries out beat frequency, and output includes the second of ultrashort laser subpulse string
Laser pulse；
Combined beam unit, the combined beam unit are used to the first laser pulse and the second laser pulse closing beam,
Third laser pulse is exported, the third laser pulse includes the ultrashort laser pulse string of multiple and different frequency subpulse strings.
Preferably, in above-mentioned double-colored THz source, the chirp spread unit includes: the first beam splitter, parallel grating
Pair and retroreflection element；
The laser pulse of the light source module output passes sequentially through first beam splitter point and the parallel grating pair
The incident retroreflection element, passes sequentially through the parallel grating pair and first beam splitter after reflection, incident
The beam splitting unit, the parallel grating is to for carrying out chirp spread.
Preferably, in above-mentioned double-colored THz source, the parallel grating is to being oppositely arranged and mutual flat including two
Capable grating, the grating are holographic diffraction grating.
Preferably, in above-mentioned double-colored THz source, the retroreflection element is retroreflection prism.
Preferably, in above-mentioned double-colored THz source, the beam splitting unit is the second beam splitter, second beam splitter
Reflection and transmission is than adjustable.
Preferably, in above-mentioned double-colored THz source, the first beat frequency unit includes with the second beat frequency unit
One plate beamsplitter mirror and two plane mirrors；
For the first beat frequency unit, the chirped pulse all the way of the beam splitting unit output passes through the first beat frequency list
The plate beamsplitter mirror of member is divided into two-way chirp subpulse, which passes through the one of the first beat frequency unit respectively
A plane mirror is reflected back the plate beamsplitter mirror of the first beat frequency unit, is input to after plate beamsplitter mirror coupling described
Combined beam unit；
For the second beat frequency unit, the another way chirped pulse of the beam splitting unit output passes through second beat frequency
The plate beamsplitter mirror of unit is divided into two-way chirp subpulse, which passes through the second beat frequency unit respectively
One plane mirror is reflected back the plate beamsplitter mirror of the second beat frequency unit, is input to institute after plate beamsplitter mirror coupling
State combined beam unit.
Preferably, in above-mentioned double-colored THz source, in same beat frequency unit, the mirror surface of the plane mirror perpendicular to
The transmission direction of the chirp subpulse of the plate beamsplitter mirror output.
Preferably, in above-mentioned double-colored THz source, the combined beam unit is light combination mirror, the reflection and transmission of the light combination mirror
Than adjustable, the angle for being incident to the laser pulse and the medium side of the light combination mirror and the normal of medium side of the light combination mirror is equal
It is 45 °.
Preferably, in above-mentioned double-colored THz source, it is photoconductive antenna or non-linear crystalline substance that module, which occurs, for the Terahertz
Body.
Preferably, in above-mentioned double-colored THz source, further includes: several reflecting mirrors, the mirror surface direction of the reflecting mirror with
It is incident between the transmission direction of the light pulse of the reflecting mirror in the presence of greater than 0 ° and the angle less than 90 °.
The present invention has also proposed a kind of method that double-colored THz source exports double-colored terahertz pulse, which comprises
Pass through light source module output laser pulse；
Chirp spread is carried out by the laser pulse that laser pulse train forming module exports the light source module, forms two
Road chirped pulse carries out beat frequency to two-way chirped pulse respectively, forms the first laser pulse including ultrashort laser subpulse string
And the second laser pulse including ultrashort laser subpulse string, by the first laser pulse and the second laser pulse
Beam is closed, forms third laser pulse, the third laser pulse includes the ultrashort laser pulse of multiple and different frequency subpulse strings
String；
Module occurs by Terahertz and is based on the double-colored terahertz light of third pulsed laser output.
As can be seen from the above description, the method for double-colored THz source provided by the invention and its double-colored terahertz pulse of output
In, the laser pulse width that laser pulse train forming module can be exported based on light source module forms third laser pulse, the third
Laser pulse includes the ultrashort laser pulse string of multiple and different frequency subpulse strings, and then it is defeated to make Terahertz that module occur
Double-colored terahertz light out is the double-colored terahertz pulse for including two different subpulses of frequency.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of structural schematic diagram of double-colored THz source provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram for exporting double-colored terahertz pulse method provided in an embodiment of the present invention；
Fig. 3 is that double-colored THz source shown in Fig. 1 obtains under the conditions of two-way beat frequency rate is respectively 1.0THz and 0.5THz
Double-colored terahertz pulse schematic diagram；
Fig. 4 is that double-colored THz source shown in Fig. 1 obtains under the conditions of two-way beat frequency rate is respectively 1.5THz and 2.0THz
Double-colored terahertz pulse schematic diagram；
Fig. 5 is that double-colored THz source shown in Fig. 1 obtains under the conditions of two-way beat frequency rate is respectively 2.5THz and 3.0THz
Double-colored terahertz pulse schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As stated in the background art it is existing for TPTP measurement THz source be mostly single-frequency THz source, i.e., pump light and
The frequency for detecting light is consistent, and adjustability is poor.
Since the characteristic response frequency coverage area of system to be measured may be very big, single-frequency THz source measures TPTP
The scope of application forms great limitation.And if realizing the continuously adjustable of frequency using two independent THz sources, it is right
The synchronizing of two beam terahertz lights requires high, and the prior art is not possible to realize.It can be used for the double frequency THz source of TPTP measurement urgently
It is to be developed.
To solve the above-mentioned problems, the embodiment of the invention provides a kind of double-colored THz source, device is simple, can be convenient
The double-colored terahertz pulse comprising the different subpulse of two frequencies is efficiently produced, and the frequency of each subpulse can be only
It stands and continuously adjusts.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
With reference to Fig. 1, Fig. 1 is a kind of structural schematic diagram of double-colored THz source provided in an embodiment of the present invention, this is double-colored too
Hertz source includes: light source module 1, and module 2 occurs for laser pulse train forming module 3 and Terahertz.
Wherein, the light source module 1 is used for output laser pulse.The laser pulse train forming module 3 is used for will be described
The laser pulse that light source module 1 exports carries out chirp spread, forms two-way chirped pulse, claps respectively two-way chirped pulse
Frequently, formed includes the first laser pulse of ultrashort laser subpulse string and the second laser arteries and veins including ultrashort laser subpulse string
The first laser pulse and the second laser pulse are closed beam, form third laser pulse, the third laser arteries and veins by punching
Punching includes the ultrashort laser pulse string of multiple and different frequency subpulse strings.The Terahertz occurs module 2 and is used for based on described the
The double-colored terahertz light of three pulsed laser outputs.
As shown in Figure 1, the laser pulse train forming module 3 includes: chirp spread unit 31, unit 31 is opened up in the chirp
Laser pulse for exporting the light source module 1 carries out chirp spread, exports chirped pulse；Beam splitting unit 32, described point
Shu Danyuan 32 is used to the chirped pulse that the chirp spread unit 31 exports being divided into two-way chirped pulse；First beat frequency unit
33a and the second beat frequency unit 33b, the first beat frequency unit 33a are used for the chirp all the way exported to the beam splitting unit 32
Pulse carries out beat frequency, and output includes the first laser pulse of ultrashort laser subpulse string；The second beat frequency unit 33b for pair
The another way chirped pulse that the beam splitting unit 32 exports carries out beat frequency, and output includes the second laser of ultrashort laser subpulse string
Pulse；Combined beam unit 34, the combined beam unit 34 are used to the first laser pulse and the second laser pulse closing beam,
Third laser pulse is exported, the third laser pulse includes the ultrashort laser pulse string of multiple and different frequency subpulse strings.Two
After road chirped pulse inputs independent beat frequency unit progress beat frequency respectively, then it is input to combined beam unit 34, final output includes two
The ultrashort laser pulse string of the subpulse string of a frequency Independent adjustable.
The chirp spread unit 31 includes: the first beam splitter 313, parallel grating to 311 and retroreflection element
312.Wherein, the laser pulse that the light source module 1 exports passes sequentially through first beam splitter 313 and the parallel grating
To the 311 incident retroreflection elements 312, the parallel grating pair and first beam splitting are passed sequentially through after reflection
Mirror 313, the incident beam splitting unit 32, the parallel grating is to for carrying out chirp spread.First beam splitter 313 has
Half-reflection and half-transmission interface, the laser pulse that light source module 1 exports divide by the first beam splitter 313 for two-way, all the way laser pulse to
Lower reflection, another way laser pulse are incident to parallel grating to 311 through the first beam splitter 313, pass through in parallel grating to 311
After first time chirp spread, incident retroreflection element 312 is again incident on parallel grating after retroreflection element 312
To 311, parallel grating to 311 after second of chirp spread, incident first beam splitter 313, by the first beam splitter 313
Reflex to beam splitting unit 32.
Optionally, the parallel grating includes two gratings that are being oppositely arranged and being parallel to each other to 311, and the grating is
Holographic diffraction grating, to generate linear-chirped-pulse using its group delay dispersion.The laser pulse that light source module 1 exports is by flat
Line raster to be broadened after 311 become with linear chrip characteristic (instantaneous frequency of light field linear function temporally and become
Change) laser pulse.Wherein, wavelength X=800nm of laser pulse, pulse halfwidth degree FWHM be 160fs.Parallel grating
It is as follows to 311 parameter: incisure density D=1800 (line/mm), incident light angle γ=39.7 °, grating space b=2.9cm.
The retroreflection element 312 is retroreflection prism.The retroreflection element 312 is for changing parallel grating
Parallel grating is returned it to the transmission direction of the laser pulse with chirping characteristics of 311 outputs and carries out secondary broadening to 311,
To increase broadening amount.First beam splitter 313 is prism beam splitter, the chirped pulse for completing secondary broadening to 311 by parallel grating
Beam splitting unit 32 is reflexed to via the first beam splitter 313.
The beam splitting unit 32 is the second beam splitter, and the reflection and transmission of second beam splitter is than adjustable.Pass through adjusting
Its reflection and transmission ratio, thus it is possible to vary the intensity ratio of two-way laser pulse after beam splitting, so that the double-colored terahertz emission finally generated
Power is also adjustable.
As shown in Figure 1, the first beat frequency unit 33a and the second beat frequency unit 33b include a plate beamsplitter
Mirror 331 and two plane mirrors 332.In same beat frequency unit, not by a plate beamsplitter mirror 331 and two reflection light paths
With and can independently, the plane mirror 332 of continuously adjustable composition.Plate beamsplitter mirror 331 be used for the chirped pulse of input into
Row, which is beamed into chirp subpulse and carries out beat frequency to the chirp subpulse that plane mirror 332 returns, forms the sub- arteries and veins of ultrashort laser
Punching string, adjusting for beat frequency rate can be realized by adjusting the light path of plane mirror 332.Herein with plate beamsplitter mirror 331 without
Using prism beam splitter, to reduce optical path difference error.
For the first beat frequency unit 33a, the chirped pulse all the way that the beam splitting unit 32 exports passes through described first
The plate beamsplitter mirror 331 of beat frequency unit 33a divides for two-way chirp subpulse, which passes through described first respectively
A plane mirror 332 of beat frequency unit 33a is reflected back the plate beamsplitter mirror 331 of the first beat frequency unit 33a, flat at this
Plate beam splitter 331 is input to conjunction beam Unit 34 after coupling.For the second beat frequency unit 33b, the beam splitting unit 32
The another way chirped pulse of output is divided by the plate beamsplitter mirror 331 of the second beat frequency unit 33b for two-way chirp subpulse,
The plane mirror 332 that the two-way chirp subpulse passes through the second beat frequency unit 33b respectively is reflected back described second
The plate beamsplitter mirror 331 of beat frequency unit 33b is input to the combined beam unit 34 after the plate beamsplitter mirror 331 coupling.
Wherein, in same beat frequency unit, the mirror surface of the plane mirror 332 is defeated perpendicular to the plate beamsplitter mirror 331
The transmission direction of chirp subpulse out.That is, in the first beat frequency unit 33a, corresponding two plane mirrors
332 mirror surface corresponds to the transmission direction of the chirp subpulse of output perpendicular to plate beamsplitter mirror 331, in the second beat frequency unit 33b
In, the mirror surface of corresponding two plane mirrors 332 corresponds to the biography of the chirp subpulse of output perpendicular to plate beamsplitter mirror 331
Defeated direction.
Optionally, the double-colored THz source can also further include several reflecting mirrors 35 according to light path layout demand, reflection
The mirror surface direction of mirror 35 and be incident to reflecting mirror 35 light pulse transmission direction between exist be greater than 0 ° and the angle less than 90 °.
As shown, having a reflecting mirror 35 between the first beat frequency unit 33a of setting and beam splitting unit 32, the first beat frequency unit is set
There is another reflecting mirror 35 between 33a and combined beam unit 34.The effect of reflecting mirror 35 is neatly to change optic path side
To in practical application, the angle of the mirror surface direction of reflecting mirror 35 and incident pulse transmission direction can be in (0 °, 90 °) range
It is any to adjust.It can also be by changing the placement direction of beam splitting unit 32 and the position of beat frequency unit to reduce reflecting mirror 35
Quantity is not provided with reflecting mirror 35.
Optionally, the combined beam unit 34 is light combination mirror, and the reflection and transmission of the light combination mirror is incident to described than being adjusted
The angle of the normal of the medium side and medium side of the laser pulse of light combination mirror and the light combination mirror is 45 °, to ensure by closing
The transmission direction of Shu Jinghou two pulses is point-blank.It includes but is not limited to for photoconduction that module 2, which occurs, for the Terahertz
Antenna or nonlinear crystal.
It should be noted that optical transport can be realized by optical fiber between all parts in the embodiment of the present invention, or logical
It crosses free light field to realize, can be arranged according to device application scenarios, the embodiment of the present invention is not specifically limited in this embodiment.
1 shoot laser pulse of light source module is the pulse of Fourier's change limitation.First beam splitter 313 and parallel grating pair
It is the pulse of existing chirp spread output between 311, which is Gaussian-shaped pulse, and for pulsewidth by broadening, bandwidth is constant, limit
Determine chirp expression is the instantaneous carrier frequency linear variation at any time of pulse.Beam splitting unit 32 and the first chirp unit 33a
Between, the laser pulse type between beam splitting unit 32 and the second chirp unit 33b and the first beam splitter 313 and parallel grating pair
Laser pulse type between 311 is consistent, but light intensity is the first beam splitter 313 and parallel grating to the laser between 311
The half of pulse.Two beat frequency units are Gaussian arteries and veins to laser pulse train, including micropulse is transmitted between combined beam unit 34
Punching, micropulse bandwidth reduce, and bandwidth and initial Gaussian Fourier's change limitation bandwidth ratio are after diminution
Burst envelope is Gaussian shaped profile, and the light pulse distribution after the distribution and the transmission chirp expansion of the first beam splitter 313 is consistent.
Double-colored THz source structure of the invention is simple, can generate to convenient and efficient the arteries and veins different comprising two frequencies
The double-colored terahertz pulse of punching, and the frequency of each subpulse independently and can be adjusted continuously.
Make the micropulse repetition frequency in subpulse string different from each other by adjusting beat frequency rate, it includes more for can obtaining
The ultrashort laser pulse string of a different frequency subpulse string encourages photoconducting antenna and electromagnetic radiation with this ultrashort laser pulse series excitation
Wave, according to displacement current equationWhen excitation light pulse pulsewidth is in subpicosecond range, the electromagnetic wave arteries and veins
Punching is terahertz pulse, and the radiation frequency of terahertz pulse is determined by the repetition rate of micropulse in ultrashort pulse string, therefore should
Ultrashort laser pulse series excitation hair photoconductive antenna can produce the high power terahertz pulse of a variety of different-wavebands, and Terahertz
The frequency of pulse is continuously adjustable.It is applied in TPTP fields of measurement, more measurement systems can be covered, expand measurement model
It encloses；Apparatus of the present invention also have huge applications potentiality in THz tomography field.
Based on the above embodiment, another embodiment of the present invention additionally provides double-colored THz source described in a kind of above-described embodiment
The method for exporting double-colored terahertz pulse, the method is as shown in Fig. 2, Fig. 2 is that a kind of output provided in an embodiment of the present invention is double
The flow diagram of color terahertz pulse method, this method comprises:
Step S11: pass through light source module output laser pulse.
The general laser pulse can be Gaussian Fourier transformation laser pulse.The light source module includes semiconductor
Laser.The light source module can export single laser pulse
Step S12: chirp exhibition is carried out by the laser pulse that laser pulse train forming module exports the light source module
Width forms two-way chirped pulse, carries out beat frequency to two-way chirped pulse respectively, forms first laser pulse and second laser arteries and veins
The first laser pulse and the second laser pulse are closed beam, form third laser pulse by punching.Laser arteries and veins can be passed through
It rushes forming module and chirp spread twice is carried out to laser pulse.
The first laser pulse includes ultrashort laser subpulse string.The second laser pulse includes the sub- arteries and veins of ultrashort laser
Punching string.The third laser pulse includes the ultrashort laser pulse string of multiple and different frequency subpulse strings.Such as third laser pulse
It may include the ultrashort laser pulse string of the subpulse string of two frequency Independent adjustables.Each subpulse string includes multiple scarcely perceptible pulses
Punching.
Step S13: module is occurred by Terahertz and is based on the double-colored terahertz light of third pulsed laser output.
The method of the embodiment of the present invention can export double-colored Terahertz by the double-colored THz source through the foregoing embodiment
Pulse can generate to convenient and efficient the double-colored terahertz pulse comprising the different subpulse of two frequencies, and each sub- arteries and veins
The frequency of punching independently and can be adjusted continuously.
Illustrate below with reference to analog result, double-colored THz source described in the embodiment of the present invention and its double-colored Terahertz arteries and veins of output
Effect of the method for punching when exporting double-colored terahertz pulse:
With reference to Fig. 3-Fig. 5, Fig. 3 be Fig. 1 shown in double-colored THz source two-way beat frequency rate be respectively 1.0THz and
The schematic diagram of the double-colored terahertz pulse obtained under the conditions of 0.5THz, Fig. 4 are double-colored THz source shown in Fig. 1 in two-way beat frequency frequency
Rate is respectively the schematic diagram of the double-colored terahertz pulse obtained under the conditions of 1.5THz and 2.0THz, and Fig. 5 is double-colored terahertz shown in Fig. 1
The schematic diagram for the double-colored terahertz pulse that hereby source obtains under the conditions of two-way beat frequency rate is respectively 2.5THz and 3.0THz.
The double-colored terahertz pulse that double-colored THz source of the invention generates it can be seen from attached drawing 3-5 includes two frequencies
The different subpulse string of rate, and by adjusting beat frequency rate, the frequency of subpulse string is also continuously adjusted and mutually indepedent, two sons
Time interval between train of pulse is also continuously adjusted.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For method disclosed in embodiment
For, since it is corresponding with double-colored THz source disclosed in embodiment, so being described relatively simple, related place is referring to double
Color THz source corresponding part explanation.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that article or equipment including a series of elements not only include those elements, but also
It including other elements that are not explicitly listed, or further include for this article or the intrinsic element of equipment.Do not having
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that in the article including above-mentioned element
Or there is also other identical elements in equipment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of double-colored THz source, which is characterized in that the double-colored THz source includes:
Light source module, the light source module are used for output laser pulse；
Laser pulse train forming module, the laser pulse train forming module are used for the laser pulse for exporting the light source module
Chirp spread is carried out, two-way chirped pulse is formed, beat frequency is carried out to two-way chirped pulse respectively, being formed includes the sub- arteries and veins of ultrashort laser
The first laser pulse and second laser pulse including ultrashort laser subpulse string for rushing string, by the first laser pulse with
And beam is closed in the second laser pulse, forms third laser pulse, the third laser pulse includes the sub- arteries and veins of multiple and different frequencies
Rush the ultrashort laser pulse string of string；
Module occurs for Terahertz, and the Terahertz occurs module and is used to be based on the double-colored Terahertz of third pulsed laser output
Light.
2. double-colored THz source according to claim 1, which is characterized in that the laser pulse train forming module includes:
Chirp spread unit, the laser pulse that the chirp exhibition unit is used to export the light source module carry out chirp spread,
Export chirped pulse；
Beam splitting unit, the beam splitting unit are used to the chirped pulse that the chirp spread unit exports being divided into two-way chirp arteries and veins
Punching；
First beat frequency unit and the second beat frequency unit, the first beat frequency unit are used for beam splitting unit output all the way
Chirped pulse carries out beat frequency, and output includes the first laser pulse of ultrashort laser subpulse string；The second beat frequency unit is used for
Beat frequency is carried out to the another way chirped pulse of beam splitting unit output, output includes the second laser of ultrashort laser subpulse string
Pulse；
Combined beam unit, the combined beam unit are used to the first laser pulse and the second laser pulse closing beam, output
Third laser pulse, the third laser pulse include the ultrashort laser pulse string of multiple and different frequency subpulse strings.
3. double-colored THz source according to claim 2, which is characterized in that the chirp spread unit includes: first point
Shu Jing, parallel grating pair and retroreflection element；
The laser pulse of the light source module output passes sequentially through first beam splitter point and the parallel grating to incidence
The retroreflection element passes sequentially through the parallel grating pair and first beam splitter after reflection, described in incidence
Beam splitting unit, the parallel grating is to for carrying out chirp spread.
4. double-colored THz source according to claim 3, which is characterized in that the parallel grating is set relatively to including two
Grating that is setting and being parallel to each other, the grating are holographic diffraction grating.
5. double-colored THz source according to claim 3, which is characterized in that the retroreflection element is retroreflection rib
Mirror.
6. double-colored THz source according to claim 2, which is characterized in that the beam splitting unit is the second beam splitter, institute
The reflection and transmission of the second beam splitter is stated than adjustable.
7. double-colored THz source according to claim 2, which is characterized in that the first beat frequency unit and the second count
Frequency unit includes a plate beamsplitter mirror and two plane mirrors；
For the first beat frequency unit, the chirped pulse all the way of the beam splitting unit output passes through the first beat frequency unit
Plate beamsplitter mirror is divided into two-way chirp subpulse, the two-way chirp subpulse pass through respectively one of the first beat frequency unit it is flat
Face reflecting mirror is reflected back the plate beamsplitter mirror of the first beat frequency unit, is input to the conjunction beam after plate beamsplitter mirror coupling
Unit；
For the second beat frequency unit, the another way chirped pulse of the beam splitting unit output passes through the second beat frequency unit
Plate beamsplitter mirror be divided into two-way chirp subpulse, which passes through one of the second beat frequency unit respectively
Plane mirror is reflected back the plate beamsplitter mirror of the second beat frequency unit, is input to the conjunction after plate beamsplitter mirror coupling
Shu Danyuan.
8. double-colored THz source according to claim 2, which is characterized in that in same beat frequency unit, the plane reflection
The transmission direction for the chirp subpulse that the mirror surface of mirror is exported perpendicular to the plate beamsplitter mirror.
9. double-colored THz source according to claim 2, which is characterized in that the combined beam unit is light combination mirror, the conjunction
The reflection and transmission of Shu Jing is incident to the laser pulse of the light combination mirror and the medium side and medium side of the light combination mirror than being adjusted
The angle of normal be 45 °.
10. a kind of method that double-colored THz source exports double-colored terahertz pulse, which is characterized in that the described method includes:
Pass through light source module output laser pulse；
Chirp spread is carried out by the laser pulse that laser pulse train forming module exports the light source module, forms two-way Zhou
Sing pulse, beat frequency carried out to two-way chirped pulse respectively, formed include ultrashort laser subpulse string first laser pulse and
The first laser pulse and the second laser pulse are closed in second laser pulse including ultrashort laser subpulse string
Beam forms third laser pulse, and the third laser pulse includes the ultrashort laser pulse string of multiple and different frequency subpulse strings；
Module occurs by Terahertz and is based on the double-colored terahertz light of third pulsed laser output.
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