CN106953224A - Continuous tilt impulse wave face-pumping lithium niobate produces the method and device of THz wave - Google Patents
Continuous tilt impulse wave face-pumping lithium niobate produces the method and device of THz wave Download PDFInfo
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- CN106953224A CN106953224A CN201710321497.0A CN201710321497A CN106953224A CN 106953224 A CN106953224 A CN 106953224A CN 201710321497 A CN201710321497 A CN 201710321497A CN 106953224 A CN106953224 A CN 106953224A
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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 present invention relates to femtosecond laser optical rectification method produce THz wave method, to realize continuous tilt pulse corrugated, without introduce it is any when, sky, frequency domain distortion, light THz wave conversion efficiency can be lifted, and with cheap, it is easy to adjust, it is simple efficient, the characteristics of practical.To reach above-mentioned purpose, the present invention, continuous tilt impulse wave face-pumping lithium niobate produces the method and device of THz wave, be made up of femtosecond laser light source, beam expanding lens, plane-parallel reflector, imaging len, lithium columbate crystal, plane-parallel reflector by two panels it is opposite to the total reflective mirror of pumping laser wave band, parallel, dislocation placement constitute；The laser pulse that femtosecond laser light source is produced is plane by described beam expanding lens afterpulse corrugated, then projects plane-parallel reflector, the parallel output after the secondary reflection of plane-parallel reflector two, then imaged lens projects are to lithium columbate crystal.Present invention is mainly applied to produce THz wave occasion.
Description
Technical field
The present invention relates to the method that femtosecond laser optical rectification method produces THz wave, particularly one kind uses double mirror
The plane-parallel reflector of composition realizes the method that continuous corrugated heeling pump Pu lithium niobate produces Terahertz.
Background technology
It is that the important photon in Terahertz Technology field is learned to do to produce ultrafast THz wave using optical rectification method at present
One of section [1].The dominant mechanism that optical rectification method produces ultrafast THz wave is the second nonlinear using nonlinear crystal
Effect.When femtosecond pulse acts on nonlinear crystal, the monochromatic component no longer independent propagation in pulse, but be mixed
Phenomenon.It neutralizes frequency effect and produces frequency close to the light wave of second harmonic, and beat effect can then produce a low-frequency oscillation
Electric polarization, this electric polarization field energy enough gives off the low-frequency electromagnetic wave in terahertz wave band.Therefore, imitated using optical rectification
The energy that THz wave should be produced is mainly derived from the energy of incident laser pulse, and its energy conversion efficiency is depended on：
The second order nonlinear coefficient of medium, medium are to the phase between the absorption coefficient and laser pulse and THz wave of THz wave
Match condition.After nonlinear crystal is selected, phase-matching condition is exactly only consideration controllable factor.Femtosecond laser
Phase matched when being acted on nonlinear crystal is better, then pumping pulse can be acted on the THz wave produced in crystal
Distance is longer, and the light-light conversion efficiency of THz wave is just higher.
It is necessary to have the nonlinear crystal of larger nonlinear factor in the research that optical rectification method produces THz wave,
And the nonlinear crystal that can match lasing light emitter wave band generation THz wave at present is limited.Wherein have compared with high non-linearity system
Several lithium niobate (LiNbO3) crystal is one of current most popular crystal.But the THz wave band refractive indexes in the crystal
THz wave can only be sent in the form of " Cerenkov radiation " more than the refractive index of pump light, therefore under the conditions of conventional pumping,
And exported with silicon prism or along THz ripple exit direction sliced crystals face.Under these conditions, due to pump light and THz wave
" space is walked off " effect and " Cerenkov radiation " [2] THz wave taper launch face so that use LiNbO3 crystal
THz source generation efficiency is relatively low and THz wave is second-rate.
Until 2002, Hungarian Hebling etc. [3] was proposed in LiNbO3 crystal using inclination impulse wave face-pumping
(TPFP) new method, can provide pump light has velocity component in THz wave direction, and maintains and THz wave speed
It is synchronous, thus overcome " when, empty walk-off effect ", hence it is evident that add conversion efficiency；And cause THz wave by " Cherenkov
The conical surface transmitting of radiation " is changed into one-way planar transmitting, and the availability of THz wave is also greatly promoted.From this this technology
Research obtains fast development with application.The method that pulse wave front tilting is realized in current TPFP technologies is carried using diffraction grating
The angle dispersion of confession, recycles lens imaging system to tilt corrugated Pulse Imageing on the inside of the exit facet of LiNbO3 crystal prisms.
Therefore, in the technology for tilting impulse wave face-pumping LiNbO3 crystal generation THz wave, pulse corrugated is tilted
Quality is most important to the generation process and quality of THz wave.In principle, the method on pulse corrugated is tilted except providing arteries and veins
Outside the inclined effect in shock front, should not on original pumping pulse when, the characteristic such as sky, frequency domain bring influence, otherwise produce
THz wave when, sky, frequency domain characteristic will be different from non-inclined pulse corrugated method.However, using diffraction grating angle
During TPFP is realized in dispersion, time and space chirp necessarily are introduced to former pumping femtosecond pulse；Simultaneously because optical grating construction
Presence, when being to the result of impulse action, frequency division dissipate, that is, it is no longer continuous to tilt the pulse corrugated behind corrugated, be by
During each in light beam, frequency division from small-pulse effect set form, and light beam is also diverging light, this give the accuracy that is imaged below and
Generation Terahertz process, which is brought, to be significantly affected.
In addition, can realize accurately meet LiNbO at present3Crystal prism shooting angle (produces terahertz in lithium niobate crystal body
The hereby Cherenkov corrugated of ripple) inclination pulse corrugated needed for diffraction grating parameter be difficult to be matched with existing commercial grating parameter.
If customizing grating high cost.The commercial grating of parameter similar is typically all purchased, angle of inclination mistake has so been necessarily introduced
Difference.Therefore, THz wave technology field, a kind of continuous tilt pumping pulse of research and development are produced for TPFP lithium columbate crystals
Corrugated, but do not cause pumping pulse when, the new technology of the characteristic distortion such as sky, frequency domain is very important.
[1] Xu Jingzhou, Zhang Xicheng, Terahertz science and technology and application, BJ University Press, 2007.
[2]D.H.Auston,K.P.Cheung,J.A.Valdmanis,and D.A.Kleinman,Cherenkov
radiation from femtosecond optical pulses in electro-optic media,
Phys.Rev.Lett.1984,53:1555.
[3]Hebling J,Almasi G,Kozma I Z,et al.Velocity matching by pulse
front tilting for large-area THz-pulse generation[J].Optics Express,2002,10
(21):1161.
The content of the invention
To overcome the deficiencies in the prior art, the present invention is directed to propose the parallel planar reflective that a kind of use double mirror is constituted
Device realizes the method that continuous corrugated heeling pump Pu lithium niobate produces Terahertz.This method is opposing parallel using two panels plane mirror
Dislocation place, to expanding after pumping femtosecond pulse realize continuous tilt pulse corrugated, without introduce it is any when, sky, frequency
The distortion in domain, can lift light-THz wave conversion efficiency, and with cheap, easy to adjust, simple efficient, practicality
Strong the characteristics of.To reach above-mentioned purpose, the technical solution adopted by the present invention is that continuous tilt impulse wave face-pumping lithium niobate is produced
The device of THz wave, is made up of femtosecond laser light source, beam expanding lens, plane-parallel reflector, imaging len, lithium columbate crystal,
Plane-parallel reflector by two panels it is opposite to the total reflective mirror of pumping laser wave band, parallel, dislocation placement constitute；Femtosecond laser light source
The laser pulse of generation is plane by described beam expanding lens afterpulse corrugated, then projects plane-parallel reflector, through flat
Parallel output after the secondary reflection of row plane reflector two, then imaged lens projects are to lithium columbate crystal.
The described lithium columbate crystal thang-kng plane of incidence is the z-a faces of the optical axis of crystal, and crystal exit face and the angle in z-b faces are
63.5 degree；According to incident wavelength, the angle can be adjusted.
Exit facet of the lithium columbate crystal pulse corrugated parallel to lithium columbate crystal is projected, the exit facet of lithium columbate crystal is pressed
According to the Cerenkov radiation face cutting that THz wave is produced in lithium niobate crystal body.
The method that continuous tilt impulse wave face-pumping lithium niobate produces THz wave, uses femtosecond laser light source, beam expanding lens
The pulse that pulse corrugated is plane is produced, is placed using the opposing parallel dislocation of two panels plane mirror, flies the pumping after expanding
Continuous tilt pulse corrugated is realized in pulse per second (PPS), then imaged lens projects are to lithium columbate crystal.
Exit facet of the lithium columbate crystal pulse corrugated parallel to lithium columbate crystal is projected, the exit facet of lithium columbate crystal is pressed
According to the Cerenkov radiation face cutting that THz wave is produced in lithium niobate crystal body.
The features of the present invention and beneficial effect are：
Because the plane-parallel reflector that this method is constituted using double mirror realizes that wave tilt pumping lithium niobate is produced
The technology of Terahertz, is not related to angle dispersion and diffraction, therefore compared with first method, the present invention has following outstanding feature：
1. this method is by expanding and reflecting and realize the inclination to pumping pulse corrugated to pumping pulse, without right
When original pulse introduces other, the distortion of sky, frequency domain.
2. this method is by expanding than adjusting the regulation realized to pumping pulse inclined wave face angle degree, operation letter with incidence angle
Folk prescription is just.
3. the beam exit direction after pumping pulse wave tilt and dispersion angle will not be changed in this method.So that after
The imaging system in face is in experimentation without adjusting again.
4. realize that to pumping pulse wave tilt insertion loss is small by two secondary reflections in this method.
The need for 5. expanding in this method is not only realization to pumping pulse wave tilt, while being greatly reduced
Power (energy) density in crystal is mapped to, is conducive to continuing to increase pump power, obtains higher THz wave power (energy
Amount).
6. the component used in this method is all very easy to obtain, relatively first method, with low cost.
Brief description of the drawings：
Plane-parallel reflector structure and schematic diagram that Fig. 1 double mirrors are constituted.
The plane-parallel reflector that Fig. 2 is constituted using double mirror realizes that wave tilt pumping lithium niobate produces Terahertz
The sketch of method.Label is respectively in figure：Femtosecond laser light source 1, beam expanding lens 2, plane-parallel reflector 3, imaging len 4, niobium
Sour lithium crystalline substance 5.
Fig. 3 contrast and experiment figures.
Embodiment
Present invention aims to overcome that prior art produces THz wave using grating slope impulse wave face-pumping lithium niobate
The limitation of method realizes continuous corrugated heeling pump Pu niobic acid there is provided the plane-parallel reflector that a kind of use double mirror is constituted
The method that lithium produces Terahertz.This process employs two panels plane mirror it is opposing parallel dislocation place, to expanding after pumping
Femtosecond pulse realizes continuous tilt pulse corrugated, without introduce it is any when, sky, frequency domain distortion, improve light-Terahertz
Ripple conversion efficiency.The present invention is easy to adjust with cheap, simple efficient, the characteristics of practical.
Method of the present invention solution is as follows：
The plane-parallel reflector that a kind of use double mirror is constituted realizes that continuous corrugated heeling pump Pu lithium niobate is produced too
The method of hertz, the device used includes femtosecond laser light source, beam expanding lens, plane-parallel reflector, imaging len, lithium niobate
Crystal.It is characterized in that this method comprises the following steps：
1. described femtosecond laser light source output wavelength is 1040nm femtosecond pulse, and laser pulse is expanded by described
Mirror；
2. pumping laser beam diameter is expanded to 2-4 times by described beam expanding lens.Pumping pulse after expanding is passed through
Described plane-parallel reflector；
3. described niobic acid is incident to by described imaging len by described plane-parallel reflector pumping pulse
Crystalline lithium；
Described 1040nm pumping lasers pulse can meet following condition：
1. described 1040nm femto-second lasers can be the pulse laser of other wavelength.
2. described 1040nm femto-second lasers pulse width is fs-ps magnitudes.
Described plane-parallel reflector meets claimed below.
1. described plane-parallel reflector is by two panels is opposite to the total reflective mirror of pumping laser wave band, parallel, misplace placement
Constitute；
2. spacing, the depth of parallelism and the integral-rotation angle between the two panels speculum of described plane-parallel reflector can
Adjust.
Described imaging len meets claimed below：
1. described imaging len can be simple lens imaging or poly-lens combined imaging.
Described lithium columbate crystal meets claimed below：
2. the described lithium columbate crystal thang-kng plane of incidence is the z-a faces of the optical axis of crystal, crystal exit face and the angle in z-b faces
For 63.5 degree；According to incident wavelength, the angle can be adjusted.
The present invention principle be：
Produce the plane-parallel reflector of pumping pulse wave tilt by two panels it is opposite to the total reflective mirror of pumping laser wave band,
Parallel, dislocation, which is placed, to be constituted, and its structure is as shown in Figure 1.The pumping pulse of a branch of extension, is plane when its pulse corrugated starts,
All parts in space reach vertical reference plane simultaneously i.e. within the same time；Incline when the pulsed light is incided according to design requirement
After the plane-parallel reflector tiltedly placed, only passing through two secondary reflections parallel can export, i.e., insertion loss is small and beam quality
It is high；Due to being extension light beam, the pulse only generates what pulse corrugated was practised physiognomy relative to position after plane-parallel reflector
Tilt；Particularly by reflection process former pumping pulse will not be introduced as the angle dispersion of grating approach when, sky chirp；And pumping
The angle of inclination of pulse is only related to expanding than or inciding the angle of plane-parallel reflector, therefore adjusts the parameter
Control the angle of inclination of pulse；Because the pulse Jing Guo plane-parallel reflector outgoing is directional light, thus lens below into
As system is once mixed up, without adjusting again；The pump light for tilting pulse corrugated enters lithium niobate crystal by lens imaging system
Body, pulse corrugated parallel to lithium columbate crystal exit facet (face according in crystal produce THz wave Cerenkov radiation
Cut in face).As described above, the composition sketch of whole system is as shown in Figure 2.Result of study shows, this invention technology with it is original
Method, which is compared, can effectively lift the conversion efficiency of THz wave and the quality of THz wave.
The present invention is that the plane-parallel reflector constituted using double mirror realizes that wave tilt pumping lithium niobate is produced too
The method of hertz, please referring initially to Fig. 2, Fig. 2 is that the plane-parallel reflector that the present invention is constituted using double mirror realizes that corrugated is inclined
Oblique pumping lithium niobate produces the index path of the method for Terahertz, as seen from the figure, and the device used includes femtosecond laser light source, expanded
Shu Jing, plane-parallel reflector, imaging len, lithium columbate crystal.This method comprises the following steps：
A) femtosecond laser light source (1) described in exports laser pulse of the wavelength for 1040nm 50fs-150fs, swashs
Described beam expanding lens (2) is passed through in light pulse；
B) a diameter of 2mm-4mm of pumping laser pulse light beam is exported by described beam expanding lens (2), then by described
Plane-parallel reflector (3).
C) plane-parallel reflector (3) described in exports a pumping pulse for tilting pulse corrugated and passes through described imaging
Lens (4).
The pumping pulse for tilting pulse corrugated is coupled into lithium columbate crystal and produces terahertz by the imaging len (4) described in d)
Hereby ripple.
Described 1040nm pumping laser pulses meet following condition：
Described 1040nm femto-second lasers can be the pulse laser of other wavelength.
Described plane-parallel reflector meets claimed below：
1. described plane-parallel reflector is by two panels is opposite to the total reflective mirror of pumping laser wave band, parallel, misplace placement
Constitute；
2. spacing, the depth of parallelism and the integral-rotation angle between the two panels speculum of described plane-parallel reflector can
Adjust.
Described imaging len meets claimed below：
1. described imaging len can be simple lens imaging or poly-lens combined imaging, such as telescopic system.
Described lithium columbate crystal meets claimed below：
1. the described lithium columbate crystal thang-kng plane of incidence is the z-a faces of the optical axis of crystal, crystal exit face and the angle in z-b faces
For 63.5 degree；According to incident wavelength, the angle can be adjusted.
Claims (5)
1. a kind of continuous tilt impulse wave face-pumping lithium niobate produces the device of THz wave, it is characterized in that, by femtosecond laser light
Source, beam expanding lens, plane-parallel reflector, imaging len, lithium columbate crystal are constituted, and plane-parallel reflector is swashed by two panels to pumping
The total reflective mirror of optical band is opposite, parallel, dislocation is placed and constituted；The laser pulse that femtosecond laser light source is produced is expanded by described
Mirror afterpulse corrugated is plane, then projects plane-parallel reflector, parallel defeated after the secondary reflection of plane-parallel reflector two
Go out, then imaged lens projects are to lithium columbate crystal.
2. continuous tilt impulse wave face-pumping lithium niobate as claimed in claim 1 produces the device of THz wave, it is characterized in that,
The described lithium columbate crystal thang-kng plane of incidence is the z-a faces of the optical axis of crystal, and crystal exit face and the angle in z-b faces are 63.5 degree；
According to incident wavelength, the angle can be adjusted.
3. continuous tilt impulse wave face-pumping lithium niobate as claimed in claim 1 produces the device of THz wave, it is characterized in that,
Exit facet of the lithium columbate crystal pulse corrugated parallel to lithium columbate crystal is projected, the exit facet of lithium columbate crystal is according to lithium niobate
The Cerenkov radiation face cutting of THz wave is produced in crystal.
4. a kind of method that continuous tilt impulse wave face-pumping lithium niobate produces THz wave, it is characterized in that, continuous tilt pulse
The method that pumping lithium niobate in corrugated produces THz wave, it is plane to produce pulse corrugated using femtosecond laser light source, beam expanding lens
Pulse, is placed using the opposing parallel dislocation of two panels plane mirror, the pumping femtosecond pulse after expanding is realized continuous tilt arteries and veins
Shock front, then imaged lens projects are to lithium columbate crystal.
5. the method that continuous tilt impulse wave face-pumping lithium niobate as claimed in claim 4 produces THz wave, it is characterized in that,
Exit facet of the lithium columbate crystal pulse corrugated parallel to lithium columbate crystal is projected, the exit facet of lithium columbate crystal is according to lithium niobate
The Cerenkov radiation face cutting of THz wave is produced in crystal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107404059A (en) * | 2017-07-21 | 2017-11-28 | 天津大学 | Continuous tilt impulse wave face-pumping lithium niobate produces the method and device of THz wave |
| CN107561813A (en) * | 2017-09-05 | 2018-01-09 | 天津大学 | Based on compound lens continuous tilt pulse corrugated THz wave generation device and method |
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| CN104158077A (en) * | 2014-07-31 | 2014-11-19 | 天津大学 | Rapid tuning terahertz parametric oscillation radiation source device and method based on rowland circle |
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| JP2000137077A (en) * | 1998-11-02 | 2000-05-16 | Nec Corp | Pulse laser distance measuring device |
| CN101408708A (en) * | 2008-11-26 | 2009-04-15 | 天津大学 | Pumping optical multiplexing high-efficiency generating high power THz radiation pulse source |
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| CN107404059A (en) * | 2017-07-21 | 2017-11-28 | 天津大学 | Continuous tilt impulse wave face-pumping lithium niobate produces the method and device of THz wave |
| CN107404059B (en) * | 2017-07-21 | 2024-02-02 | 天津大学 | Method and device for generating terahertz waves by continuously inclined pulse wave surface pumping lithium niobate |
| CN107561813A (en) * | 2017-09-05 | 2018-01-09 | 天津大学 | Based on compound lens continuous tilt pulse corrugated THz wave generation device and method |
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