CN106936054A - A kind of method of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide - Google Patents
A kind of method of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide Download PDFInfo
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- CN106936054A CN106936054A CN201710345527.1A CN201710345527A CN106936054A CN 106936054 A CN106936054 A CN 106936054A CN 201710345527 A CN201710345527 A CN 201710345527A CN 106936054 A CN106936054 A CN 106936054A
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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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Abstract
The invention discloses a kind of method of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide, its object is to solve the problem that prior art efficiently excites THz wave to exist using collinear phase matching.The scheme of use is：Sub-wavelength waveguide ferroelectric material as terahertz radiation source, the femto-second laser pulse for allowing laser to produce are focused on sub-wavelength waveguide side, terahertz pulse is produced by impulsive stimulated Raman scattering；Under sub-wavelength waveguide effect, the phase matched of long range is met between the THz wave and femtosecond laser of specific wavelength, produce arrowband, the THz wave for amplifying；Terahertz time-domain transient state spectrum is obtained by phase contrast imaging；Fast Fourier Transform (FFT) is carried out to it using correlation computations software on computer, the narrow band terahertz band wave frequency spectrum being amplified.The present invention has device simply easily manipulation, THz wave narrow bandwidth and the characteristics of efficiency high, can improve sensitivity and the precision of detection.
Description
Technical field
The present invention relates to THz wave generation technology field, more particularly to a kind of narrow band terahertz band based on sub-wavelength waveguide
Wave producer and the method for detection.
Background technology
THz wave frequency range be between microwave and infrared ray, i.e. 0.1THz to 10THz, corresponding wavelength from 3 millimeters to
30 microns.Due to its residing specific position in electromagnetic spectrum, with a series of special properties, for example：Transient state, low energy
Property, penetrability, high bandwidth and security etc. that harmful organism ionizes will not be produced, this causes that THz wave is supervised in biomolecule
The fields such as survey, national defense safety, medical diagnosis, noninvasive imaging, safety check have broad application prospects.And the product of narrow band terahertz band wave
The raw sensitivity for improving detection is especially important.
At present, producing the method for the relevant THz wave in arrowband has a lot, for example：Free electron laser, quanta cascade swash
Light device, Cherenkov's non-colinear phase matched and THz wave and femtosecond laser collinear phase matching etc..It is especially conllinear
Phase matched, it is possible to achieve the effective extraction interacted with energy long.But because THz wave is different with femtosecond laser speed,
With transmission, both deviate so that the realization of phase matched is still relatively difficult, so as to limit relevant narrow band terahertz band
The efficient of ripple excites.
The content of the invention
Present invention seek to address that prior art realizes the problem of collinear phase matching using anisotropic nonlinear crystal,
There is provided a kind of sub-wavelength waveguide broadside and detection system, the THz wave and femtosecond laser of specific wavelength meet it is long away from
From collinear phase matching, it is achieved thereby that the reinforcement of narrow band terahertz band wave.
To achieve the above object, the scheme of present invention use is：
(1) it is vertically fixed on behind post lens as terahertz radiation source using sub-wavelength waveguide ferroelectric material；
(2) start femto-second laser, produce femto-second laser pulse, laser pulse to produce pump light and detection by beam splitter
Light；
(3) pump light converges at sub-wavelength waveguide side through post lens, and Terahertz is excited by impulsive stimulated Raman scattering
Ripple；
(4) according to Effective index method, in sub-wavelength waveguide, between the THz wave and femtosecond laser of specific wavelength
Meet the phase matched of long range, realize the generation and amplification of narrow band terahertz band wave；
(5) due to optical kerr effect and photorefractive effect, THz wave causes index distribution in waveguide to change, and detects light
Fundamental frequency signal and aperture system filter shaping are filtered off through bbo crystal frequency multiplication, filter plate, sub-wavelength waveguide surface is incided, will
Variations in refractive index caused by THz wave is recorded in its phase information, by 4F systems, is converted into strength information, then through prolonging
Slow line adjustment can obtain terahertz time-domain transient pulse signal on CCD；
(6) Fast Fourier Transform (FFT) is done to terahertz time-domain pulse signal using correlation computations software on computer, obtains
The narrow band terahertz band wave frequency spectrum of amplification.
Wherein, step (1) Central Asia length waveguides ferroelectric material refers to material of the thickness at 0.3-300 μm, and material properties are
Ferroelectric crystal such as lithium niobate, lithium tantalate.
Preferably, the wavelength of femto-second laser pulse is ultraviolet to near-infrared in step (2), and repetition rate is 1Hz-
100MHz, pulsewidth can be 5-1000fs.
Preferably, the average power density of pump light is minimum not less than 4W/cm in step (2)2, not more than sub-wavelength
Waveguide ferroelectric material damage threshold, and ferroelectric material damage threshold is different for different materials numerical value, such as complete same lithium niobate
Threshold value be 50KW/cm2, for mg-doped lithium niobate threshold value more than 1000KW/cm2。
Preferably, the incidence angle that pump light is incided in sub-wavelength waveguide in step (3) is no more than ± 10 °, focal beam spot
Big I is 10-150 μm.
Preferably, step (3) Central Asia length waveguides side refers to sub-wavelength thickness direction and the short transverse composition of structure
Two dimensional surface.
Step (4) middle and long distance phase matched refers to that pump light focuses on sub-wavelength waveguide side, inspires wide range too
Hertz wave.Under sub-wavelength waveguide limitation, effective refractive index can be less than the refractive index in body material, and different frequencies to THz wave
The corresponding refractive index of rate is different；For pump light, duct thickness is much larger than femtosecond laser wavelength, and its refractive index is regarded as normal
Number.Therefore, in the timing of duct thickness one, the THz wave for always having CF has and femtosecond laser identical refractive index, from
And the THz wave of narrow linewidth is produced.In addition, broadside structure interferes mutually length to provide for THz wave and femtosecond laser
Sufficiently long range, effectively realizes the amplification of narrow band terahertz band wave.Therefore, the bar that long range phase matched need to meet
Part：
And there is long enough distance interference mutually long in Terahertz transmission direction.Wherein,It is the Terahertz of frequency f
Effective phase refractive index of the ripple in sub-wavelength waveguide,It is pump light group index in the waveguide.
Compared with prior art, the invention has the advantages that：
The present invention effectively changes the effective refractive index of THz wave due to the structure using sub-wavelength waveguide so that
The collinear phase matching of THz wave and femtosecond laser is possibly realized in lithium niobate, and this is provided for the generation of narrow band terahertz band wave
A kind of more succinct scheme；
The present invention can realize the continuous reinforcement of THz wave due to the system using broadside, effectively reduce system
Complexity, improve the stability of system, be capable of achieving narrow band terahertz band wave generation and amplification.
The present invention has that device is simple, low cost, source material are easily obtained, Terahertz pulse width, efficiency high the characteristics of.
Brief description of the drawings
Fig. 1 is broadside narrow band terahertz band wave Experimental equipment
Fig. 2 is the structural representation of broadside
Fig. 3 is the schematic diagram of the phase matched of one embodiment
Fig. 4 is the spectrogram of the narrow band terahertz band wave of one embodiment
Drawing reference numeral is as follows：
1- femto-second lasers, 2- beam splitters, 3-BBO, 4- filter plate, the speculums of 5- first, 6- delay lines, 7- pin-hole filter-ings
System, the speculums of 8- the 4th, the speculums of 9- the 5th, the speculums of 10- the 6th, 11- posts lens, 12- terahertz radiation sources, 13-
4F systems, 14-CCD, 15- computer, a- pump lights, b- THz waves.
Specific embodiment
The present invention proposes a kind of method of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide, with reference to
Accompanying drawing, is described further to the solution of the present invention.
As shown in figure 1, anti-the inventive system comprises femto-second laser 1, beam splitter 2, bbo crystal 3, filter plate 4, first
Penetrate mirror 5, the second speculum and the 3rd speculum and constitute delay line 6, pin-hole filter-ing system 7, the 4th speculum 8, the 5th speculum
9th, the 6th speculum 10, post lens 11, terahertz radiation source 12,4F systems 13, CCD 14 and computer 15.
Accompanying drawing 2 is the structural representation of broadside, and wherein a is pump light, and b is THz wave.
Implementation steps of the invention：
(1) it is vertically fixed on behind post lens 11, sub-wavelength waveguide as terahertz emission source 12 using sub-wavelength waveguide
Ferroelectric material refers to material of the thickness at 0.3-300 μm, and material properties are ferroelectric crystal such as lithium niobate, lithium tantalate；
(2) start femto-second laser 1, produce femto-second laser pulse, wavelength can be ultraviolet to near-infrared, repetition rate 1Hz-
100MHz, pulsewidth 5-1000fs, laser pulse produce pump light and detection light by beam splitter 2；
(3) pump light reflects through the 4th speculum 8, the 5th speculum 9 and the 6th speculum 10, then poly- through the line of post lens 11
Jiao produces THz wave in the side of terahertz radiation source 12 by impulsive stimulated Raman scattering；
(4) according to Effective index method, in sub-wavelength waveguide, between the THz wave and femtosecond laser of specific wavelength
The phase matched of long range is met, so as to realize the generation and amplification of narrow band terahertz band wave；
(5) due to optical kerr effect and photorefractive effect, THz wave causes index distribution in waveguide to change, and detects light
Fundamental frequency signal is filtered by the frequency multiplication of bbo crystal 3, filter plate 4, then by the first speculum 5, delay line 6, into pin-hole filter-ing system
System 7 filters detection light radio-frequency component, the surface of terahertz radiation source 12 is incided, by the variations in refractive index caused by THz wave
Record, by 4F systems 13, is converted into strength information in its phase information, by dynamic mobile delay line, can be in CCD 14
Upper acquisition terahertz time-domain transient pulse signal；
(6) Fast Fourier Transform (FFT) is done to terahertz time-domain pulse signal using correlation computations software on computer 15, obtains
To the narrow band terahertz band wave frequency spectrum for amplifying.
The average power density of pump light is minimum not less than 4W/cm in above-mentioned steps (2)2, not more than sub-wavelength
Waveguide ferroelectric material damage threshold, and ferroelectric material damage threshold is different for different materials numerical value.
The incidence angle that pump light is incided in sub-wavelength waveguide in above-mentioned steps (3) is no more than ± 10 °, and focal beam spot is big
I is 10-150 μm.
Refer to that pump light focuses on sub-wavelength waveguide side in above-mentioned steps (4) middle and long distance phase matched referring to Fig. 2,
Excite wide range THz wave.Due to the limitation of sub-wavelength duct thickness, the effective refractive index of THz wave can be less than in body material
Refractive index, and the corresponding refractive index of different frequency is different；And to pump light, duct thickness is much larger than femtosecond laser wavelength, because
This, the refractive index of pump light is regarded as constant.In the timing of duct thickness one, the THz wave and femtosecond for always having CF swash
Light has identical refractive index, so as to the THz wave of narrow linewidth can be produced.In addition, broadside structure is THz wave and femtosecond
Laser interference is mutually long to provide sufficiently long range, effectively realizes the amplification of narrow band terahertz band wave.Therefore, long range phase
The condition that matching need to meet：
And there is long enough distance interference mutually long in Terahertz transmission direction.Wherein,It is the Terahertz of frequency f
Effective phase refractive index of the ripple in sub-wavelength waveguide,It is pump light group index in the waveguide.
Embodiment：
Narrow band terahertz band wave based on sub-wavelength waveguide is produced and detection method is comprised the following steps that：
(1) use size for 1cm × 30 μ m 1.1cm, y to cutting mg-doped lithium niobate sub-wavelength waveguide as Terahertz
Radiation source, is vertically fixed on behind post lens；
(2) start titanium sapphire femto-second laser, produce wavelength 800nm, repetition rate 1KHz, the laser of pulsewidth 120fs
Pulse, after laser pulse shines beam splitter with 45° angle, reflected light is pump light, and transmitted light is detection light, pump light and detection light
Initial bit it is mutually identical but mean power is respectively 450mW and 50mW；
(3) pump light reflects through the 4th speculum, the 5th speculum and the 6th speculum, then through post lens line focus in too
Hertz wave radiation source side, parallel to optical axis of crystal direction, focal beam spot is 30 μm to focus direction, is dissipated by impacting excited Raman
Penetrate and excite THz wave；
(4) according to Effective index method, under the limitation of sub-wavelength waveguiding structure, the THz wave and femtosecond of specific wavelength
The phase matched of long range is met between laser, the generation and amplification of narrow band terahertz band wave is realized；
(5) due to optical kerr effect and photorefractive effect, THz wave causes index distribution in waveguide to change, and detects light
Fundamental frequency light is filtered through bbo crystal frequency multiplication, filter plate, then by the first speculum, delay line 6, is filtered into pin-hole filter-ing system
Detection light radio-frequency component, incides terahertz radiation source front, and the variations in refractive index caused by THz wave is recorded at it
In phase information, by 4F systems, image on CCD.By dynamic mobile delay line, the dynamic of transient state THz wave is capable of achieving
Imaging.
(6) Fast Fourier Transform (FFT) is done to terahertz time-domain burst spectrum using MATLAB softwares on computer, is amplified
Narrow band terahertz band wave frequency spectrum.
The polarization direction of the pump light, detection light and THz wave is each parallel to lithium columbate crystal optical axis direction.
Accompanying drawing 3 is the schematic diagram of phase matched, and the intersection point of pump light and THz wave effective refractive index represents phase matched
Point.It is theoretical according to slab guide, when femto-second laser pulse polarization and focus direction incide mg-doped lithium niobate each parallel to optical axis
During sub-wavelength waveguide side, the THz wave of TE patterns is inspired.Under sub-wavelength waveguide limitation, the THz wave of wide range has
Refractive index 5.11 has reduced in effect refractive index opposite bank lithium niobate, and the corresponding effective refractive index of different frequency is different.And
The refractive index of femtosecond laser is regarded as 2.2.For 30 μm of lithium columbate crystal of thickness, frequency is the THz wave of 0.28THz
With with femtosecond laser identical refractive index, so as under conditions of phase matched is met, the THz wave of narrow linewidth is produced
It is raw.In addition, broadside structure interferes mutually length to provide sufficiently long range for THz wave and femtosecond laser, it is effective to realize
The amplification of narrow band terahertz band wave, gained spectrogram is as shown in Figure 4.
Obvious above-described embodiment only clearly illustrates examples of the invention, and not to the restriction of implementation method.
For those of ordinary skill in the field, on the basis of the above description, the change of other multi-forms can also be made
Change or change, there is no need and unable to be exhaustive to all implementation methods.Thus the obvious change or change amplified
Among moving still in the protection domain of the invention.
Claims (7)
1. a kind of method of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide, it is characterised in that including following
Step：
(1) it is vertically fixed on behind post lens as terahertz radiation source using sub-wavelength waveguide ferroelectric material；
(2) start femto-second laser, produce femto-second laser pulse, laser pulse to produce pump light and detection light by beam splitter；
(3) pump light converges at sub-wavelength waveguide side through post lens, and THz wave is excited by impulsive stimulated Raman scattering；
(4) according to Effective index method, in sub-wavelength waveguide, meet between the THz wave and femtosecond laser of specific wavelength
The phase matched of long range, realizes the generation and amplification of narrow band terahertz band wave；
(5) due to optical kerr effect and photorefractive effect, THz wave causes index distribution in waveguide to change, detection light warp
Bbo crystal frequency multiplication, filter plate filter off fundamental frequency signal and aperture system filter shaping, incide sub-wavelength waveguide surface, will too
Variations in refractive index caused by Hertz wave is recorded in its phase information, by 4F systems, is converted into strength information, then delayed
Line regulation and control can obtain terahertz time-domain transient pulse signal on CCD；
(6) Fast Fourier Transform (FFT) is done to terahertz time-domain pulse signal using correlation computations software on computer, is amplified
Narrow band terahertz band wave frequency spectrum.
2. the method for a kind of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide according to claim 1,
Characterized in that, step (1) Central Asia length waveguides ferroelectric material refers to material of the thickness at 0.3-300 μm, material properties
It is ferroelectric crystal such as lithium niobate, lithium tantalate.
3. the method for a kind of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide according to claim 1,
Characterized in that, the wavelength of femto-second laser pulse is ultraviolet to near-infrared in the step (2), repetition rate is 1Hz-
100MHz, pulsewidth can be 5-1000fs.
4. the method for a kind of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide according to claim 1,
Characterized in that, the average power density of pump light is minimum not less than 4W/cm in the step (2)2, not more than sub-wavelength
The damage threshold of waveguide ferroelectric material, for example, with the damage threshold of lithium niobate be full 50KW/cm2, mg-doped lithium niobate damage threshold
Value is more than 1000KW/cm2。
5. the method for a kind of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide according to claim 1,
Characterized in that, the incidence angle that pump light is incided in sub-wavelength waveguide in the step (3) is no more than ± 10 °, focal beam spot
Big I is 10-150 μm.
6. the method for a kind of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide according to claim 1,
Characterized in that, sub-wavelength thickness direction and short transverse that step (3) Central Asia length waveguides side refers to structure are constituted
Two dimensional surface.
7. the method for a kind of narrow band terahertz band wave producer and detection based on sub-wavelength waveguide according to claim 1,
Characterized in that, step (4) the middle and long distance phase matched refers to work as
And the matching way met when Terahertz transmission direction has long enough distance interference mutually long, wherein,It is frequency
Effective phase refractive index of the THz wave of rate f in sub-wavelength waveguide,It is femtosecond light group index in the waveguide.
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Cited By (4)
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| CN109286053A (en) * | 2018-10-09 | 2019-01-29 | 南开大学 | A kind of on piece broadband Terahertz unidirectional transmission unit on combination gradual change super surface and sub-wavelength waveguide |
| CN110160984A (en) * | 2019-01-08 | 2019-08-23 | 南开大学 | It is a kind of that enhancing device is sensed based on the on piece Terahertz of super surface and lithium niobate mixed structure |
| CN110504613A (en) * | 2019-08-30 | 2019-11-26 | 中国科学院半导体研究所 | Fourier mode locking optical-electronic oscillator |
| CN111033375A (en) * | 2017-08-10 | 2020-04-17 | 株式会社拓普康 | Terahertz wave generation method and terahertz wave generation device |
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| CN111033375A (en) * | 2017-08-10 | 2020-04-17 | 株式会社拓普康 | Terahertz wave generation method and terahertz wave generation device |
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