CN106841094A - A kind of method for improving terahertz time-domain spectroscopy system spectrum resolution ratio - Google Patents
A kind of method for improving terahertz time-domain spectroscopy system spectrum resolution ratio Download PDFInfo
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- CN106841094A CN106841094A CN201710002309.8A CN201710002309A CN106841094A CN 106841094 A CN106841094 A CN 106841094A CN 201710002309 A CN201710002309 A CN 201710002309A CN 106841094 A CN106841094 A CN 106841094A
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- 238000001328 terahertz time-domain spectroscopy Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001228 spectrum Methods 0.000 title claims abstract description 14
- 239000013078 crystal Substances 0.000 claims abstract description 105
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000009514 concussion Effects 0.000 claims abstract description 12
- 239000006096 absorbing agent Substances 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 20
- 230000008033 biological extinction Effects 0.000 claims description 15
- 230000005622 photoelectricity Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 abstract description 11
- 238000002592 echocardiography Methods 0.000 abstract description 4
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- 238000005516 engineering process Methods 0.000 description 14
- 230000010287 polarization Effects 0.000 description 8
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- 230000000694 effects Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000005388 cross polarization Methods 0.000 description 2
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J3/433—Modulation spectrometry; Derivative spectrometry
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Abstract
The invention discloses a kind of method for improving terahertz time-domain spectroscopy system spectrum resolution ratio, including：Electro-optic crystal in terahertz time-domain spectroscopy system is designed as wedge shape, the preceding surface of electro-optic crystal is vertical with the optical axis of exploring laser light, the optical axis of rear surface and exploring laser light forms angle；The exploring laser light of the outgoing after concussion in electro-optic crystal is sheltered from using wave-absorber.The present invention can change the direction of propagation on laser surface after crystal by designing the cutting angle of electro-optic crystal, avoid after the exploring laser light repeatedly shaken in crystal is repeated several times interaction with THz wave and enter detector, can set about eliminating echo from the root that system echoes are produced, increase effective THz wave measurement data, improve the spectral resolution of terahertz time-domain spectroscopy system.
Description
Technical field
It is more particularly to a kind of to improve terahertz time-domain spectroscopy system spectrum resolution ratio the present invention relates to Terahertz Technology field
Method.
Background technology
Background of related of the invention is illustrated below, but these explanation might not constitute it is of the invention existing
Technology.
Terahertz time-domain spectroscopy (Terahertz time domain spectroscopy, THz-TDS) technology is terahertz
Hereby the Typical Representative of technology, is a kind of emerging, very effective coherent detection technology.Due to turning for many macromolecular substances
Dynamic, vibration level is all in Terahertz frequency range, therefore terahertz time-domain spectroscopic technology can be used for the identification of some illegal drugs；It is another
Aspect, transmissivity, reflectivity of the material in terahertz frequency range can be obtained using terahertz time-domain spectroscopic technology, can indirectly calculate material
Expect in Terahertz frequency range refractive index, extinction coefficient, dielectric constant etc., to provide measurement in Terahertz frequency range material property research
Means.
THz-TDS technologies, due to its exclusive advantage, make it in last decade as a kind of Terahertz measuring technology more
Between obtained it is quick development and be widely applied.But the spectral resolution and narrow-band technology phase of current THz-TDS technologies
Than also very coarse, the spectral range of its measurement is also smaller than FT-NIR spectra (FTS) technology.Improve spectral resolution and expansion
Measurement spectral range will be the Main way of following THz-TDS technologies development.
In terahertz time-domain spectroscopy system using electro-optic crystal electrooptic effect detection THz wave be obtained in that it is wider
Frequency spectrum and dynamic range higher, be other detection methods (such as photoconductive sampling) it is incomparable, therefore this is wide by method
It is general to be applied in terahertz time-domain spectroscopy system, it is considered to be a kind of preferable THz wave detection means, its detection principle is such as
Shown in Fig. 1, when the exploring laser light of only linear polarization is by after electro-optic crystal, the polarization direction of the exploring laser light of linear polarization does not change
Become, regulation quarter wave plate can make shoot laser for circular polarization, and by Wollaston prism, exploring laser light is divided into two beam cross-polarizations
And the laser of isocandela, into eyes probe, after eyes probe converts optical signal into electric signal work difference, its differential signal is
Zero.When the exploring laser light pulse for having THz wave and linear polarization is simultaneously by after electro-optic crystal, Terahertz electric field will modulate electricity
, there is pockeles effect in luminescent crystal, the exploring laser light of script linear polarization is occurred partially by the polarization direction after electro-optic crystal
Turn, then by after quarter wave plate, with elliptical polarization outgoing, now exploring laser light again by Wollaston prism when will be divided into two
Beam cross-polarization but light intensity two beam laser not etc., incide eyes probe, convert optical signal into electric signal and poor, and it is poor
Sub-signal is proportional to the electric-field intensity of THz wave, so as to realize the detection of THz wave electric field.Although electro-optic sampling is detected too
Hertz wave has many advantages, but also has one disadvantage in that the application for hampering Electro-optic sampling always, i.e., exploring laser light enters
Some detection light is understood after crystal can occur multiple reflections, concussion in the front and rear surfaces of electro-optic crystal, and be sent out with THz wave
Raw repeatedly to interact, so as to form Terahertz echo, these echoes are not the true reflection of THz wave, are due to visiting
Survey laser and act on what is caused again with THz wave after device inside reflection, therefore use tera-hertz spectra systematic survey sample
During product, the data before echo can only being retained, this will have a strong impact on the time domain length of available THz wave, so as to influence Terahertz
Spectral resolution.
The content of the invention
The purpose of the present invention is the system echoes for eliminating terahertz time-domain spectroscopy system, increases effective terahertz time-domain ripple
Graphic data length, improves the spectral resolution of terahertz time-domain spectroscopy system.
The method of the raising terahertz time-domain spectroscopy system spectrum resolution ratio in the present invention, including：By terahertz time-domain light
Electro-optic crystal in spectra system is designed as wedge shape, the preceding surface of electro-optic crystal is vertical with the optical axis of exploring laser light, rear surface with visit
The optical axis for surveying laser forms angle；
The exploring laser light of the outgoing after concussion in the electro-optic crystal is sheltered from using wave-absorber；
Wherein, terahertz time-domain spectroscopy system includes：
The off axis paraboloidal mirror of perforate, for the focusing of THz wave；Focal length laser lens, for the poly- of exploring laser light
It is burnt；Electro-optic crystal and photoelectricity auto-balanced detection device, for the detection of THz wave；Extinction body, for blocking and absorbing in electric light
The exploring laser light repeatedly shaken in crystal.
Preferably, the focus of exploring laser light overlaps with the focus of THz wave, and positioned at the rear surface of electro-optic crystal.
Preferably, the rear surface of electro-optic crystal is circular conical surface, and the summit of circular conical surface is located on the optical axis of exploring laser light and court
To the preceding surface of electro-optic crystal.
Preferably, the rear surface of electro-optic crystal is two dimensional surface.
Preferably, the cutting angle of electro-optic crystal meets following relation：
In formula, θ for electro-optic crystal cutting angle, i.e., the angle between the preceding surface of bus and electro-optic crystal of circular conical surface or
Angle between person's two dimensional surface and the preceding surface of electro-optic crystal, unit for °；X is minimum distance apart, and L is exploring laser light in electricity
The distance of transmission primaries in luminescent crystal, unit is mm.
Preferably, X >=h；In formula, h is the spot size after focusing on, and unit is mm.
Preferably, extinction body is arranged on the rear surface of electro-optic crystal or is arranged on the rear side on surface after electro-optic crystal.
Preferably, extinction body is attached on the rear surface of electro-optic crystal, and the through hole that is provided centrally with of extinction body is used to transmit
The exploring laser light shaken from electro-optic crystal outgoing and not in electro-optic crystal.
It is wedge shape that be designed as electro-optic crystal in terahertz time-domain spectroscopy system by the present invention, the preceding surface of electro-optic crystal with
The optical axis of exploring laser light is vertical, the optical axis of rear surface and exploring laser light forms angle.By the cutting angle for designing electro-optic crystal
The direction of propagation on laser surface after crystal can be changed, it is to avoid the multiple exploring laser light and THz wave of concussion in crystal
Enter detector after interaction is repeated several times, eliminate echo, increase effective THz wave measurement data, improve terahertz
The hereby spectral resolution of time-domain spectroscopy system.
Brief description of the drawings
By the specific embodiment part of offer referring to the drawings, the features and advantages of the present invention will become more
It is readily appreciated that, in the accompanying drawings：
Fig. 1 is the principle schematic for showing probe portion in terahertz time-domain spectroscopy system in the prior art；
Fig. 2 is to show that the present invention improves the principle schematic of the method for terahertz time-domain spectroscopy system spectrum resolution ratio；
Fig. 3 is the structural representation for showing electro-optic crystal of the present invention；
Fig. 4 is to show the spy involved by a kind of method for improving terahertz time-domain spectroscopy system spectrum resolution ratio of the present invention
Survey apparatus structure schematic diagram；
In figure, 10, focal length laser lens；11 exploring laser lights；12 THz waves；13 ', electro-optic crystal of the prior art；
13rd, the electro-optic crystal in the present invention；14th, extinction body；15 photoelectricity auto-balanced detection devices；17th, the off axis paraboloidal mirror of perforate.
Specific embodiment
Illustrative embodiments of the invention are described in detail with reference to the accompanying drawings.Illustrative embodiments are retouched
State merely for the sake of demonstration purpose, and be definitely not to the present invention and its application or the limitation of usage.
Fig. 1 shows the principle of terahertz time-domain spectroscopy system in the prior art.THz wave 12 is through the off-axis parabolic of perforate
Face mirror 17 is irradiated to the preceding surface of electro-optic crystal 13 ' of the prior art after focusing on, exploring laser light 11 is through focal length laser lens 10
The preceding surface of electro-optic crystal 13 ' of the prior art is irradiated to after focusing, surface goes out electro-optic crystal 13 ' from the prior art afterwards
The exploring laser light penetrated enters photoelectricity auto-balanced detection device 15.From figure 1 it appears that when exploring laser light is by electro-optic crystal, meeting
In electro-optic crystal front and rear surfaces multiple reflections, repeatedly the exploring laser light of concussion interacts THz wave with crystal,
Multiple terahertz pulse waveforms will be showed in the terahertz time-domain waveform for detecting, wherein only main peak (i.e. time domain waveform
The THz wave of upper first appearance) it is the true reflection of terahertz pulse waveform, remaining is echo.These echoes will be serious
Influence can be with the time domain length of THz wave, so as to influence the spectral resolution of Terahertz.
In order to solve this problem, the present invention proposes a kind of side for improving terahertz time-domain spectroscopy system spectrum resolution ratio
Method, including：Electro-optic crystal in terahertz time-domain spectroscopy system is designed as wedge shape, the preceding surface of electro-optic crystal and exploring laser light
Optical axis is vertical, the optical axis of rear surface and exploring laser light forms angle；Sheltered from using wave-absorber after being shaken in electro-optic crystal
The exploring laser light of outgoing.Fig. 4 shows that the present invention is improved involved by the method for terahertz time-domain spectroscopy system spectrum resolution ratio
Detection device structural representation, wherein perforate off axis paraboloidal mirror 17 are used for the focusing of THz wave；Focal length laser lens 10 are used
In the focusing of exploring laser light；Electro-optic crystal 13 and photoelectricity auto-balanced detection device 15, for the detection of THz wave；Extinction body 14 is used
In the exploring laser light for blocking and absorbing the multiple concussion in electro-optic crystal.THz wave 12 is focused on through perforate off axis paraboloidal mirror 17
The preceding surface of electro-optic crystal 13 is irradiated to afterwards, before exploring laser light 11 is irradiated to electro-optic crystal 13 after being focused on through focal length laser lens 10
Surface；Enter photoelectricity auto-balanced detection device 15 from the exploring laser light of surface outgoing after electro-optic crystal 13.Electro-optic crystal of the invention
13 is wedge shape, and its preceding surface is vertical with the optical axis of exploring laser light, the optical axis of rear surface and exploring laser light formation angle.From Fig. 2 and
Fig. 3 can be seen that a part of exploring laser light and be directed through electro-optic crystal 13 with THz wave generation direct action；Some
After exploring laser light 11 enters electro-optic crystal 13, preceding surface is reflexed to by electro-optic crystal 13, the table after again after front surface reflection
Face outgoing.Due to forming angle, the biography on laser surface after crystal between the rear surface and preceding surface of electro-optic crystal of the present invention 13
Direction is broadcast to change, by electro-optic crystal 13 again the laser of secondary reflection be directed through separating one between the laser of electro-optic crystal 13
Fixed distance, it is to avoid the interference signal for avoiding exploring laser light and THz wave from causing in crystals concussion, improves Terahertz
The spectral resolution of time-domain spectroscopy system.
Additionally, existing method for echo cancellation mainly has two kinds, one kind clips echo data and zero padding, and another method is led to
Cross data processing method and filter off echo, two methods reduce the influence of echo using the method for later data treatment, can not
Echo is eliminated from root, the influence of echo can not be completely eliminated.The present invention sets about from the root for producing echo, by setting
The electro-optic crystal for counting wedge shape effectively eliminates the influence of echo, changes the direction of propagation on laser surface after crystal, it is to avoid detection swashs
The reflection and interaction of light and THz wave inside electro-optic crystal, eliminate the echo caused by nonlinear electrooptical crystal and believe
Number, raising can use time domain waveform length, reach the effect of the spectral resolution for improving terahertz time-domain spectroscopy system.
In order to improve the detectivity of photoelectricity auto-balanced detection device 15 as far as possible, prevent from causing light because laser intensity is too small
Electric auto-balanced detection device 15 cannot detect effective laser, in certain embodiments, the focus and THz wave of exploring laser light 11
12 focus overlaps, and positioned at the rear surface of electro-optic crystal 13.Using this structure type, moreover it is possible to make as far as possible brilliant in electric light
In body 13 directly by exploring laser light 11 and concussion after outgoing laser facula it is all relatively small so that two laser are easier
Separate.
In the preferred embodiment shown in Fig. 2-4, the rear surface of electro-optic crystal 13 is two dimensional surface.Those skilled in the art
It should be appreciated that the rear surface of electro-optic crystal 13 can also be other structure types, as long as laser can be changed in electro-optic crystal
The direction of propagation in 13.For example, the rear surface of electro-optic crystal 13 can be located at exploring laser light with circular conical surface, the summit of circular conical surface
On 11 optical axis and towards the preceding surface of electro-optic crystal 13.Angle between the preceding surface of bus and electro-optic crystal of circular conical surface or
Angle between person's two dimensional surface and the preceding surface of electro-optic crystal is designated as the cutting angle of electro-optic crystal 13.
The present invention by change the cutting angle of electro-optic crystal 13 can change between exploring laser light 11 and echo separate away from
From, therefore, in certain embodiments, the cutting angle of electro-optic crystal 13 can be determined according to default minimum distance apart.Electric light
The cutting angle of crystal 13 meets following relation：
In formula, θ for electro-optic crystal cutting angle, i.e. unit for °；X is minimum distance apart, and L is exploring laser light in electric light
The distance of transmission primaries in crystal, unit is mm.
Preferably, minimum distance apart X >=h；In formula, h is the spot size after focusing on, and unit is mm.The hot spot of laser
Size can be measured by 4 quadrant detector or ruler.
Extinction body 14 is used to absorb inside electro-optic crystal 13 echo of outgoing after outgoing after concussion.Shown in Fig. 2-4
In embodiment, extinction body 14 is arranged on the rear side on surface after electro-optic crystal 13.It will be appreciated by those skilled in the art that will can inhale
Body of light 14 is set directly on the rear surface of electro-optic crystal 13, for example, extinction body 14 is attached on the rear surface of electro-optic crystal 13,
Extinction body 14 be provided centrally with through hole (not shown) for transmit from the outgoing of electro-optic crystal 13 and not in electro-optic crystal 13
The exploring laser light 11 of interior concussion.
Although with reference to illustrative embodiments, invention has been described, but it is to be understood that the present invention does not limit to
The specific embodiment that Yu Wenzhong is described in detail and shown, in the case of without departing from claims limited range, this
Art personnel can make various changes to the illustrative embodiments.
Claims (8)
1. it is a kind of improve terahertz time-domain spectroscopy system spectrum resolution ratio method, it is characterised in that including：
Electro-optic crystal in terahertz time-domain spectroscopy system is designed as wedge shape, the preceding surface of the electro-optic crystal and exploring laser light
Optical axis is vertical, the optical axis of rear surface and exploring laser light forms angle；
The exploring laser light of the outgoing after concussion in the electro-optic crystal is sheltered from using wave-absorber；
Wherein, the terahertz time-domain spectroscopy system includes：
Perforate off axis paraboloidal mirror, for the focusing of THz wave；Focal length laser lens, for the focusing of exploring laser light；Electric light
Crystal and photoelectricity auto-balanced detection device, for the detection of THz wave；Extinction body, shakes for blocking and absorbing in electro-optic crystal
Swing the exploring laser light of rear outgoing.
2. the method for claim 1, it is characterised in that the focus of exploring laser light overlaps with the focus of THz wave, and
Positioned at the rear surface of the electro-optic crystal.
3. method as claimed in claim 2, it is characterised in that the rear surface of the electro-optic crystal is circular conical surface, the circular cone
The summit in face is located on the optical axis of the exploring laser light and towards the preceding surface of the electro-optic crystal.
4. method as claimed in claim 2, it is characterised in that the rear surface of the electro-optic crystal is two dimensional surface.
5. the method as described in claim 3 or 4, it is characterised in that the cutting angle of the electro-optic crystal meets following relation：
In formula, θ is the cutting angle of electro-optic crystal, i.e. angle or two between the preceding surface of bus and electro-optic crystal of circular conical surface
Angle between dimensional plane and the preceding surface of electro-optic crystal, unit for °；X is minimum distance apart, and L is exploring laser light brilliant in electric light
The distance of internal transmission primaries, unit is mm.
6. method as claimed in claim 5, it is characterised in that X >=h；
In formula, h is the spot size after focusing on, and unit is mm.
7. method as claimed in claim 5, it is characterised in that the extinction body is arranged on the rear surface of the electro-optic crystal
Rear side that is upper or being arranged on surface after the electro-optic crystal.
8. method as claimed in claim 7, it is characterised in that the extinction body is attached to the rear surface of the electro-optic crystal
On, the extinction body be provided centrally with through hole for transmit from the electro-optic crystal outgoing and not in the electro-optic crystal
The exploring laser light of concussion.
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Application publication date: 20170613 |