CN207799304U - A kind of lithium columbate crystal integrated structure and a kind of high energy terahertz pulse generation device - Google Patents
A kind of lithium columbate crystal integrated structure and a kind of high energy terahertz pulse generation device Download PDFInfo
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- CN207799304U CN207799304U CN201721353418.6U CN201721353418U CN207799304U CN 207799304 U CN207799304 U CN 207799304U CN 201721353418 U CN201721353418 U CN 201721353418U CN 207799304 U CN207799304 U CN 207799304U
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Abstract
A kind of lithium columbate crystal integrated structure of the utility model offer and high energy terahertz pulse generation device, described device include：Femto-second laser, reflecting grating, half-wave plate, imaging len and lithium columbate crystal integrated structure, the pumping femtosecond laser of the femto-second laser transmitting is diffracted by the reflecting grating on the half-wave plate, after the half-wave plate changes the polarization direction of the pumping femtosecond laser, again by being incident to after imaging len in lithium columbate crystal integrated structure, to generate terahertz pulse radiation in the lithium niobate crystal chip.Wherein, the lithium columbate crystal integrated structure is 62~63 degree including cutting into base angle, the lithium niobate crystal chip that the isosceles triangle prism lithium columbate crystal and a thickness that apex angle is 54~56 degree are 1~5mm, the lithium niobate crystal chip is completely covered by by the method for optical contact on the cylinder where the isosceles triangle prism lithium columbate crystal bottom edge, and three cylinders of the isoceles triangle cylindricality prism lithium columbate crystal are handled by optical polish.
Description
Technical field
The utility model is related to optical technical fields, more particularly, to a kind of lithium columbate crystal integrated structure and one kind
High energy terahertz pulse generation device.
Background technology
Terahertz (THz) radiation is commonly referred to as electromagnetic wave from 0.1~10THz, wave band microwave and far infrared it
Between.Due to specific position of the Terahertz frequency on electromagnetic spectrum so that the high-energy light source of this frequency range lacks very much.High energy
The terahertz emission source of amount can be divided into synchrotron radiation THz source and the small-sized THz source of Table top type according to the size of device.It is synchronous
The THz source of radiation can generate the terahertz pulse of hundred micro- burnt magnitudes, but such large-scale plant is costly and operation is high
It is expensive.The high field terahertz emission source of Table top type is mainly driven by pulsed femtosecond laser, can be divided into according to the difference of producing method：
Optical rectification, photoconducting antenna, air plasma, laser target shooting etc..
Although laser target shooting has been obtained for the energy of hundreds of micro- cokes, the terahertz emission that laser target shooting is obtained
Directionality is poor, is not suitable for subsequent applications, and radiation efficiency is relatively low, radiation mechanism also needs further to be studied.Air plasma
The Terahertz of generation can obtain the radiation of ultra wide band, very advantageous to the characterization of material, and air is as non-linear Jie
Damage threshold problem is not present in matter, but terahertz emission efficiency caused by this method is low, and air plasma is unstable, is
The poor signal to noise of system, high to double-colored phase matching requirement, mechanism also need further to explore.Large-aperture photoconductive antennas spoke
The Terahertz penetrated is efficient, and stability is good, covers the low-frequency range of terahertz emission, but photoconductive antenna relies on applying direct current
Field and high exciting power can lead to the screen effect of antenna breakdown and carrier, therefore antenna is easily destroyed, and obtain absolute
Terahertz energy is relatively low.
Up to the present, optical rectification is considered as the method that most effective Table top type generates high field terahertz emission.
Using optical rectification generate terahertz emission during, the same infrared light pulse cover in different spectral components between produce
Raw cascade difference frequency process, realizes the generation of terahertz emission.As long as phase-matching condition is met, the mistake converted under the frequency
Journey cascade will repeated, it is possible to so that infrared photon is completely converted into multiple Terahertz photons, obtain>100% light
Sub- transfer efficiency.Zinc telluridse (ZnTe) and gallium phosphide (GaP) are always to be used to realize that THz source is common by optical rectification
Material.Since their nonlinear factor is not high enough and has great two-photon absorption in infrared frequency, researcher is
Sight is turned to the larger organic crystal and lithium niobate (LiNbO3) crystal of nonlinear factor.Although organic crystal is expected very much,
Its intrinsic disadvantage, such as low damage threshold, are not used to high power high-energy laser；Small size is not used to high energy
Measure the laser excitation of large spot；Material is unstable, is easy to deliquesce, and can not prepare firm terahertz sources source；It needs specific
- 1.5 μm of pumpings of 1.2 μm of wavelength, and the technology of the high-energy laser of the frequency range is not mature enough；Crystal price is very expensive
Deng so that allow people to hang back to generate high field terahertz pulse using organic crystal.
Second method is that high field is generated in lithium columbate crystal using inclination wave front technology using the method for optical rectification
Terahertz emission.Lithium niobate is equivalent to silicon materials in semi-conductor industry in the status of optical field, is a candidate material well
Material.It has the advantages that very more such as big damage thresholds, can be used for high-energy laser；High nonlinear coefficient can get
High energy conversion efficiency；Big energy bandgaps (4eV), the energy loss for overcoming two-photon or Multiphoton Absorbtion to bring；To pump
Pumping wavelength non-selectivity etc..But since infrared light and THz wave have different refractive index, Qian Zheyue in lithium columbate crystal
It is 5, the latter is about 2.3, in order to realize that phase matched to greatest extent, Hebling etc. propose the method before inclined wave
Referring to non-patent literature U.S. optics letter Optics Express, volume 10, the 21st phase, 1611-1166 pages.
In the prior art, the committed step for THz wave being generated using photonic propulsion method is cutting for lithium niobate transmitting crystal
It cuts mode and uses trapezoidal or isosceles triangle cutting mode.During the experiment, 62- of the exciting light direct irradiation in crystal
63 ° of angles, THz wave is then along direction emits at an angle with incident exciting light.
Conventionally, as tilting non-colinear feature of the wave front technology on space geometry so that when high-energy is (single
Pulse energy is higher than 100mJ), the femto-second laser pulse of large spot (spot diameter be more than 5mm) acts on lithium columbate crystal and produces
When raw high energy terahertz pulse, close to 62-63 ° of angle cutting edge of crystal exciting light in crystal propagation distance it is too short,
And the propagation distance in crystal of the exciting light far from the arm of angle edge is long, this allows for exciting light and turns to the photon energy of THz wave
Changing efficiency can not further increase, or even to be maintained at previous level all highly difficult.
Utility model content
For solve in the prior art femto-second laser pulse act on lithium columbate crystal generate high energy terahertz pulse when
Wait, close to crystal 62-63 ° of angle cutting edge exciting light in crystal propagation distance it is too short, and the excitation far from the arm of angle edge
Light propagation distance in crystal is long, this allows for exciting light can not further increase to the photon energy transformation efficiency of THz wave
The problem of, propose a kind of lithium columbate crystal integrated structure and a kind of high energy terahertz pulse generation device.
One side according to the present utility model provides a kind of lithium columbate crystal integrated structure, including：Base angle is 62~63
Degree, the lithium niobate crystal chip that the isosceles triangle prism lithium columbate crystal and a thickness that apex angle is 54~56 degree are 1~5mm,
The lithium niobate crystal chip is completely covered by the isosceles triangle prism lithium columbate crystal bottom edge institute by the method for optical contact
Cylinder on；
Wherein, three cylinders of the isosceles triangle prism lithium columbate crystal are handled by optical polish.
Wherein, doped with the magnesia of 5~6.2mol% in the lithium columbate crystal integrated structure.
Second aspect according to the present utility model provides a kind of high energy terahertz pulse generation device, including：Femtosecond laser
The lithium columbate crystal that such as the utility model first aspect provides of device, reflecting grating, half-wave plate, imaging len and one combines knot
The pumping femtosecond laser of structure, the femto-second laser transmitting is diffracted by the reflecting grating on the half-wave plate, by institute
After stating the polarization direction that half-wave plate changes the pumping femtosecond laser, then by being incident to lithium columbate crystal combination after imaging len
In structure, to generate terahertz pulse radiation in the lithium niobate crystal chip.
Wherein, the incisure density of the reflecting grating is 1500~2000 every millimeter of lines.
Wherein, the imaging len between the grating and the lithium columbate crystal is single lens, double lens combination or column
Lens combination；The imaging magnification of the imaging len is 0.3~0.6 times.
Wherein, the pumping femtosecond laser pumped when femtosecond laser is incident on the lithium columbate crystal integrated structure
Polarization direction and the lithium niobate crystal chip crystal axis parallel.
The utility model proposes a kind of high energy terahertz pulse generation device, by improve lithium columbate crystal structure,
There is no non-for the THz wave that the exciting light of high-energy, large spot can be maintained efficient terahertz emission, while be penetrated
The problem of linear distortion, obtains better THz wave emission characteristics, is convenient for subsequent experimental application.
Description of the drawings
Fig. 1 is a kind of lithium columbate crystal knot for generating high energy terahertz pulse that one embodiment of the utility model provides
Close the structure chart that isosceles triangle prism lithium columbate crystal designs in structure；
Fig. 2 is a kind of lithium columbate crystal knot for generating high energy terahertz pulse that one embodiment of the utility model provides
Close the vertical view of structure；
Fig. 3 is a kind of structure chart for high energy terahertz pulse generation device that another embodiment of the utility model provides；
Fig. 4 is a kind of index path for high energy terahertz pulse generation device that another embodiment of the utility model provides.
Specific implementation mode
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
With reference to figure 1 and Fig. 2, Fig. 1 is that one kind that one embodiment of the utility model provides is used to generate high energy terahertz pulse
Lithium columbate crystal integrated structure in isosceles triangle prism lithium columbate crystal structure chart；Fig. 2 is implemented for the utility model one
A kind of vertical view for generating the lithium columbate crystal integrated structure of high energy terahertz pulse that example provides.The lithium columbate crystal
Integrated structure specifically includes：
It is 62~63 degree to cut into base angle, and apex angle is 54~56 degree of isosceles triangle prism lithium columbate crystal and one
Thickness is the lithium niobate crystal chip of 1~5mm, and the lithium niobate crystal chip is completely covered by the isosceles three by the method for optical contact
On cylinder where angular prism lithium columbate crystal bottom edge, wherein three columns of the isosceles triangle prism lithium columbate crystal
Face is handled by optical polish.
Specifically, the lithium niobate isoceles triangle prismatic crystals cut along the Y-direction of crystal；The crystal is in XZ planes
Cutting mode be two 62.8 degree of base angles, 54.4 degree of apex angle isosceles triangle；Y-direction cutting lithium niobate prism be
The MgO doping concentrations of 6.0mol%.It is triangular structure.Three rectangular surfaces non-anti-reflection coateds.In crystal XZ planes
Two isosceles triangle faces without polishing, and for the three face light requirement optical polishings parallel with Y direction.The lithium niobate prismatic is brilliant
The effect of body is, by the inclined wavefront of incident laser by being successfully transferred to the lithium niobate crystal on piece of combination, and will produce
Biological exciting light energy after terahertz emission, which is successfully all-trans, to be shot out, for use in the generation of next stage terahertz emission,
Achieve the purpose that exciting light energy Reusability, to improve the energy conversion efficiency of terahertz emission.
In the plane of 54.4 degree of angle faces of the crystal, it need to be combined closely one piece of lithium niobate by the method for optical contact
The cutting mode of chip, the chip cuts for Y-direction；The Z-direction of chip is parallel with the Y-axis of crystal；The size of chip has needed
Face where the isosceles triangle bottom edge of all standing lithium niobate prismatic crystals, and the Y of the X-axis of the chip and lithium niobate prismatic crystals
Axis is vertical.It can be smoothly transferred in lithium niobate crystal chip by the exciting light after lithium niobate prismatic crystals, it will not in the face of combination
Reflection loss is caused, it will not be to being damaged before inclined wave and so that high energy terahertz pulse can not generate.
Wherein, magnesia of the lithium columbate crystal integrated structure doped with 5~6.2mol%.
By this lithium columbate crystal integrated structure, for the exciting light of high-energy, large spot, overcome conventional crystal structure without
Method maintains the problem of efficient terahertz emission, while special design is so that non-linear mistake is not present in the THz wave of outgoing
Genuine problem obtains better THz wave emission characteristics, is convenient for subsequent experimental application.
With reference to figure 3, Fig. 3 is a kind of knot for high energy terahertz pulse generation device that another embodiment of the utility model provides
Composition, described device include：Femto-second laser 31, reflecting grating 32, half-wave plate 33, imaging len 34 and lithium columbate crystal combine
Structure 35.
The pumping femtosecond laser that the femto-second laser 31 emits is diffracted into the half-wave plate by the reflecting grating 32
On 33, after the half-wave plate 33 changes the polarization direction of the pumping femtosecond laser, then by incident after imaging len 34
Into lithium columbate crystal integrated structure 35, to generate terahertz pulse radiation in the lithium niobate crystal chip.
Specifically, with reference to figure 4, Fig. 4 is that a kind of high energy terahertz pulse that another embodiment of the utility model provides generates
The index path of device, the present embodiment use repetition rate for 10Hz-1kHz, and the amplifying stage that centre wavelength is 800nm-2000nm swashs
The laser pulse that light device 41 generates is come the lithium columbate crystal integrated structure 45 for exciting above-described embodiment to provide, excitation light pulse width
For 50fs-1ps, pulse highest energy about mJ magnitudes, spot diameter 5.6mm*5.3mm.Excitation light pulse passes through 1500-
The grating 42 of 2000 every millimeter of grooves is diffracted on half-wave plate, sharp here by accurately calculating the incidence angle and the angle of diffraction of grating
It is with a half-wave plate 43 that the polarization direction of light is vertical from being horizontally diverted and flat with the optical axis direction of the lithium niobate crystal chip of binding
Row so that for chip integrated structure, generates terahertz pulse radiation and be located in bound chip, and non-triangular cutting
In lithium niobate crystal body.Imaging system between grating and crystal is cylindrical lens pair 44, and imaging minification is 0.3-0.6 times.
On the basis of the above embodiments, it is preferred that the incisure density of the reflecting grating is 1500~2000 lines per milli
Rice.
Imaging len between the grating and the lithium columbate crystal can be that single lens, double lens combination or column are saturating
Microscope group is closed, and the imaging magnification of the imaging len is 0.3~0.6 times.Wherein, the pumping femtosecond laser is incident on the niobic acid
The crystal axis parallel of polarization direction and the lithium niobate crystal chip when crystalline lithium.
By this device, since the optical axis direction of lithium niobate crystal chip of polarised light and binding of vertical direction is parallel so that
For chip integrated structure, generates terahertz pulse radiation and be located in bound chip, and the lithium niobate of non-triangular cutting
In crystal so that for the exciting light of high-energy, large spot, can maintain efficient terahertz emission efficient for a long time
The problem of terahertz emission, non-linear distortion is not present in the THz wave penetrated, better THz wave emission characteristics is obtained, is convenient for
Subsequent experimental application.
Finally, the present processes are only preferable embodiment, are not intended to limit the scope of protection of the utility model.
Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should be included in this reality
Within novel protection domain.
Claims (6)
1. a kind of lithium columbate crystal integrated structure, which is characterized in that including：Base angle is 62~63 degree, and apex angle is 54~56 degree
The lithium niobate crystal chip that isosceles triangle prism lithium columbate crystal and a thickness are 1~5mm, the lithium niobate crystal chip pass through light
It learns on the cylinder where the method contacted is completely covered by the isosceles triangle prism lithium columbate crystal bottom edge；
Wherein, three cylinders of the isosceles triangle prism lithium columbate crystal are handled by optical polish.
2. a kind of high energy terahertz pulse generation device, which is characterized in that including：
Femto-second laser, reflecting grating, half-wave plate, imaging len and lithium columbate crystal integrated structure as described in claim 1,
The pumping femtosecond laser of the femto-second laser transmitting is diffracted by the reflecting grating on the half-wave plate, by described half
After wave plate changes the polarization direction of the pumping femtosecond laser, then it is as described in claim 1 by being incident to after imaging len
In lithium columbate crystal integrated structure, to generate terahertz pulse radiation in the lithium niobate crystal chip.
3. the apparatus of claim 2, which is characterized in that the incisure density of the reflecting grating is 1500~2000 lines
Every millimeter.
4. the apparatus of claim 2, which is characterized in that between the grating and the lithium columbate crystal integrated structure
Imaging len be single lens, double lens combination or cylindrical lens combination.
5. device according to claim 4, which is characterized in that the imaging magnification of the imaging len is 0.3~0.6 times.
6. the apparatus of claim 2, which is characterized in that the pumping femtosecond laser is incident on the lithium columbate crystal
The crystal axis parallel of the polarization direction and the lithium niobate crystal chip of pumping femtosecond laser when integrated structure.
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| CN107561815A (en) * | 2017-10-19 | 2018-01-09 | 北京航空航天大学 | A kind of high energy terahertz pulse generation device and method |
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| CN107561815A (en) * | 2017-10-19 | 2018-01-09 | 北京航空航天大学 | A kind of high energy terahertz pulse generation device and method |
| CN107561815B (en) * | 2017-10-19 | 2023-09-26 | 北京航空航天大学 | High-energy terahertz pulse generation device and method |
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