CN106382989A - High-spatial-resolution Terahertz detector based on 800nm optical fiber coupling - Google Patents
High-spatial-resolution Terahertz detector based on 800nm optical fiber coupling Download PDFInfo
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- 238000013519 translation Methods 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims description 16
- 230000005684 electric field Effects 0.000 claims description 12
- 239000006185 dispersion Substances 0.000 claims description 5
- 230000005281 excited state Effects 0.000 claims description 4
- 238000005311 autocorrelation function Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 24
- 230000001427 coherent effect Effects 0.000 abstract description 17
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention belongs to the technical field of Terahertz detection, and proposes a light guide antenna Terahertz detector which is high in spatial resolution and can move flexibly. The detector can enlarge the application range of a system when the detector is used in a Terahertz detection coherent system. Accordingly, the technical scheme of the invention is that the detector consists of an optical grating, an optical fiber coupler, an optical fiber, an optical fiber collimator, a short focus lens, a reflector, a Terahertz light guide probe, a lifting platform, and a two-dimensional electric translation platform. The optical grating, the optical fiber coupler and the two-dimensional electric translation platform are arranged on an optical platform. Two ends of the optical fiber are respectively connected with the optical fiber coupler and the optical fiber collimator. The optical fiber collimator, the short focus lens, the reflector and the light guide probe are arranged on the lifting platform from the top to the bottom. The lifting platform is installed on the two-dimensional electric translation platform. The detector is mainly used in the Terahertz detection occasion.
Description
Technical field
The invention belongs to terahertz detection technical field, specifically, it is related to the high-space resolution based on the coupling of 800nm optical fiber
Rate terahertz detector.
Background technology
THz wave in electromagnetic spectrum be located at infrared and microwave between, refer generally to the electromagnetic wave of frequency 0.1-10THz, closely
Over a little years, Terahertz correlation technique by extensive concern and obtains fast development, due to its special spectral position and physical property,
It is made to have very big application potential at aspects such as national defence, safety check, biomedicine, physicss.Terahertz detector is as terahertz
A hereby crucial part in technology, its development will have a strong impact on the development of Terahertz Technology, and then affect the application of Terahertz.Visit
Measuring tape width, spatial resolution, obtain Signal-to-Noise, whether can collect phase information, response speed, flexibility ratio, stability
It is the performance parameter of terahertz detector etc. parameter, these performance parameters directly determine Terahertz systematic difference scope.
Nowadays the terahertz detection means growing up mainly have：(1) photoconducting antenna detector[2]Visit with electro-optic crystal
Survey device[3], both approaches are all based on the class coherent detection method that terahertz time-domain spectroscopic technology grows up, can be simultaneously
The amplitude of record terahertz signal and phase information, can obtain higher signal to noise ratio；(2) kampometer[4]Visit with high Lay box
Survey[5], it is a class calorimetric formula detector, easily disturbed by surrounding, signal to noise ratio is relatively low；(3) heterodyne system detector[6], with
Based on electronics mixing, sensitivity is high, and structure is more complicated, and measurement effect is subject to many impact.Compare above several frequently seen
Terahertz detector[7], between 0.1-20THz, signal to noise ratio is high, can record simultaneously for the detective bandwidth of photoconducting antenna detector
The amplitude of terahertz signal and phase information, fast response time, stability is high, technology relative maturity, and structure is simply it is easy to adjust
With optimization so that the Terahertz coherent detection system based on optical waveguide detector is the widest in Terahertz research field range.
Terahertz light lead antenna detector is made up of semiconductor base and two wires[2], substrate is typically using low temperature life
Long GaAs material or the silicon-on-sapphire with radiant heat damage.In detection process, when a branch of ultrashort pulse light (arteries and veins
Rush width and be generally femtosecond magnitude) when being irradiated on the semiconductor base between two wires, instantaneous photoproduction in substrate, can be produced
Carrier, if reach the parallel direction perpendicular to metal wire for the polarization direction of the terahertz pulse on exploring antenna, in substrate
Carrier will be modulated by Terahertz electric field, between two wires formed electric current, the electricity that will be modulated by THz electric field
Stream extracts the time-domain signal that just can obtain Terahertz in time.
According to the femtosecond laser wavelength for exciting photoconducting antenna detector, terahertz light lead antenna detector is divided into two
Kind：1550nm photoconducting antenna detector and 800nm photoconducting antenna detector.
In order to improve the flexibility ratio of Terahertz system, the photoconducting antenna detector using 1550nm has been developed that light fibrillation
Detector[8], detector can flexibly be put according to experiment demand, complete the experiment of complexity.This detector is applied to take at this stage
The Terahertz system built is capable of certain Terahertz scan function, but its spatial resolution is not high, and this is by this kind
The volume of detector leads to greatly very much, and the silicon lens of this kind of detector front end limits this kind of detector and is only used for measuring Terahertz
Far field is it is impossible to break through diffraction limit of far-field it is impossible to reach the spatial resolution of sub-wavelength dimensions so as to some experiments can not be reached
Condition, which limits its range of application.
The diffraction limit in far field can be broken through by way of near field detects, and then the space of sub-wavelength dimensions can be reached and divide
Resolution.The detection Terahertz near field that appears as of the Terahertz optical probe of 800nm provides possibility[9], using this kind of probe
The terahertz detector developed is to be built based on the laser instrument of the free light in output 800nm space[10], whole in detecting module
Individual light path is all the free light path in space, applies it to although Terahertz near field can be detected in Terahertz coherent detection system,
But seem especially clumsy, the purpose of scanning can only be reached by the way of mobile example, rather than direct traveling probe is carried out
Scanning is so as to can not apply in some experiments needing traveling probe to reach scanning purpose.
Comprehensive background above technology is it would be highly desirable to seek a kind of high spatial resolution Terahertz spy based on the coupling of 800nm optical fiber
Survey device so as to have that device is simple, can easily be accommodated, high stability, high s/n ratio, high response speed, high spatial resolution and
There is the record performance such as terahertz signal amplitude and phase information function simultaneously, be integrated in Terahertz coherent system,
Terahertz detector flexibly can be moved according to experiment demand, complete kinds of experiments.This for THz devices light field verify,
The aspects such as the biology outside the spectroscopy analysis of micro/nano-scale, sample inspection, the research of Theoretical Physics and physical application
Research Significance is far-reaching.
[1] Ferguson B, Zhang Xicheng, Terahertz science and technology Research Review, physics, 2003,32 (5)：286-
293.
[2]Van Exter M,Fattinger C,Grischkowsky D.High-brightness terahertz
beams characterized with an ultrafast detector[J].Applied Physics Letters,
1989,55(4):337-339.
[3]Wu Q,Zhang X C.Ultrafast electro-optic field sensors[J].Applied
physics letters,1996,68(12):1604-1606.
[4]Richards P L.Bolometers for infrared and millimeter waves[J]
.Journal of Applied Physics,1994,76(1):1-24.
[5]Liddiard K C.Application of interferometric enhancement to self-
absorbing thin film thermal IR detectors[J].Infrared Physics,1993,34(4):379-
387.
[6]Dolan G J,Phillips T G,Woody D P.Low-noise 115-GHz mixing in
superconducting oxide-barrier tunnel junctions[J].Applied Physics Letters,
1979,34(5):347-349.
[7] Song Shufang, the progress of THz wave Detection Techniques, infrared and laser, 2012,42 (12)：1367-
1371.
[8]Gong Y D,Chia M Y W,Luo B.Terahertz spectroscopy technology trend
using 1550-nm ultrafast fiber laser[J].Microwave and Optical Technology
Letters,2007,49(2):439-443.
[9]M,Nagel M,Kurz H.Tapered photoconductive terahertz field
probe tip with subwavelength spatial resolution[J].Applied Physics Letters,
2009,95(4):041112.
[10]Bitzer A,Merbold H,Thoman A,et al.Terahertz near-field imaging of
electric and magnetic resonances of a planar metamaterial[J].Optics express,
2009,17(5):3826-3834.
Content of the invention
For overcoming the deficiencies in the prior art, it is contemplated that proposing one kind both there is high spatial resolution, detector and energy
Enough photoconducting antenna terahertz detectors flexibly moving, apply it in Terahertz coherent system, expand systematic difference
Scope.For this reason, the technical solution used in the present invention is, based on the high spatial resolution terahertz detector of 800nm optical fiber coupling,
By grating, fiber coupler, optical fiber, optical fiber collimator, short focus lens, reflecting mirror, Terahertz optical probe, lifting platform and two dimension
Motorized precision translation stage is constituted；Wherein, grating, fiber coupler and two-dimentional motorized precision translation stage are displayed on optical table；Optical fiber two ends
Connect fiber coupler and optical fiber collimator respectively；Optical fiber collimator, short focus lens, reflecting mirror and optical probe are pacified from top to bottom
It is contained on lifting platform；Lifting platform is arranged on two-dimentional motorized precision translation stage；Optical fiber collimator, short focus lens, reflecting mirror and photoconduction are visited
Pin is fixed on lifting platform from top to bottom, and the laser of laser instrument output is through grating, that fiber coupler is coupled into optical fibre optical fibre is another
The optical fiber collimator of one connection, optical fiber collimator output light is the femtosecond collimation laser of 800nm；Lifting platform can allow model
Enclose interior any movement and do not change light path；Lifting platform is arranged on two-dimentional motorized precision translation stage, enables detector to complete three-dimensional
The function of scanning THz electric field；On lifting platform, by adjusting position and the shape of optical fiber collimator, short focus lens and reflecting mirror
State, on the needle point that the light out from optical fiber collimator is focused on optical probe, makes the photoelectric current of optical probe reach maximum, such as
The excited state of optical probe is transferred to optimal so as to detect THz electric field in the best condition by this.
Grating is a pair, and laser is advanced twice back and forth in grating centering, adjusts the relative distance of two gratings and is incident to
This two parameters of the laser light incident angle of the first concave grating, it becomes possible to adjust dispersion compensation degree, are observed from light using autocorrelation function analyzer
The laser pulse width that fine collimator output comes, adjusts two above parameter, by the pulse of the laser out from optical fiber collimator
Width is transferred to 100fs.
The feature of the present invention and beneficial effect are：
Apply the invention in Terahertz coherent detection system, when in system using photoconducting antenna launch THz wave
When, the signal to noise ratio of system can reach 1000:1, and there is the ability of measurement Terahertz surface wave[11-13], system record is too
Hz information comprises amplitude and phase information simultaneously, and flexibly, easy and simple to handle, the Terahertz system using the present invention was both permissible for system
Far field for scanning imagery Terahertz[14], can be used to the near field of scanning imagery Terahertz[11-13].
Brief description：
Fig. 1 is the structural plan of the present invention；Accompanying drawing top is the x-y plane view that on optical table, each device is put,
Bottom is the x-z-plane view that on motorized precision translation stage, each device is installed.
In figure：1-a and 1-b is grating, and 2 is fiber coupler, and 3 is optical fiber, and 4 is optical fiber collimator, and 5 is that short focus are saturating
Mirror, 6-a, 6-b, 6-c and 6-d are reflecting mirrors, and 7 is Terahertz optical probe, and 8 is lifting platform, and 9 is two-dimentional motorized precision translation stage.
Specific embodiment
In existing terahertz detector, photoconducting antenna detector has that device is simple, can easily be accommodated, high stability, height
Signal to noise ratio, high response speed and the characteristic such as function with record terahertz signal amplitude and phase information simultaneously, in terahertz
Hereby in research work, the range of photoconducting antenna detector is the widest.But the photoconducting antenna of existing two kinds of respective wavelength detects
Device all has certain problem.The photoconducting antenna detector volume of 1550nm is too big, and spatial resolution is not high enough；800nm's
Probe can reach the spatial resolution of sub-wavelength, but probe can not flexibly move it is impossible to reach some experiment demands.Therefore need
One kind to be built both had had high spatial resolution, the photoconducting antenna terahertz detector that detector can flexibly move again, will
It is applied in Terahertz coherent system, expands systematic difference scope.
The present invention is a kind of high spatial resolution terahertz detector based on the coupling of 800nm optical fiber, can be applied
In the Terahertz coherent detection system that 800nm femtosecond laser excites, using the integrated Terahertz system of the present invention, there is sub-wavelength
Spatial resolution, and flexibly and easily, kinds of experiments demand can be met, the ability not only with terahertz light analysis of spectrum also has
Terahertz imaging function, has very high practical value in Terahertz scientific research field.
High spatial resolution terahertz detector based on the coupling of 800nm optical fiber, simultaneously using optical fiber and 800nm probe, makes
Detector can either move on freedom and flexibility ground, has the ability detecting Terahertz near field again, and then it is relevant to improve Terahertz
The spatial resolution of detection system, this is the key inventive point of the present invention.
The present invention forms (as shown in Figure of description) by following nine kinds of devices：Grating, fiber coupler, optical fiber, optical fiber
Collimator, short focus lens, reflecting mirror, Terahertz optical probe, lifting platform and two-dimentional motorized precision translation stage.Wherein, grating, optical fiber coupling
Clutch and two-dimentional motorized precision translation stage are displayed on the ad-hoc location of optical table；Optical fiber two ends connect fiber coupler and light respectively
Fine collimator；Optical fiber collimator, short focus lens, reflecting mirror 6-d and optical probe are arranged on lifting platform from top to bottom；Lifting platform
It is arranged on two-dimentional motorized precision translation stage.
The exciting light that the present invention uses is the femtosecond laser that wavelength is 800nm, and the laser due to laser instrument output is space
Free light, needs, using fiber coupler, this space is freely optically coupled into optical fiber；The other end of optical fiber connects fiber optic collimator
Device so that from optical fiber light out be collimated light；In order to increased the flexibility ratio of detector, will be saturating to optical fiber collimator, short focus
Mirror, reflecting mirror 6-d and optical probe are fixed on lifting platform from top to bottom, so pass through an optical fiber and just can complete to conduct laser
Effect, lifting platform can arbitrarily move in allowed band and not change light path；Lifting platform is arranged on two-dimentional electric translation
On platform, detector is enable to complete the function of 3-D scanning THz electric field；On lifting platform, need by adjusting fiber optic collimator
The position of device, short focus lens and reflecting mirror and state, on the needle point that the light out from optical fiber collimator is focused on optical probe,
Make the photoelectric current of optical probe reach maximum, so by the excited state of optical probe be transferred to optimal so as in the best condition
Detect THz electric field.
In the present invention because the optical fiber employing 800nm dissipates to laser colored, it can broadening be used for exciting optical probe
Exciting light pulse width, and then affect optical probe detective bandwidth it is therefore desirable to dispersion compensation be carried out to it, using light
Grid to being a kind of effective means, allow laser grating centering advance back and forth twice, adjustment two gratings relative distance with
And it is incident to this two parameters of laser light incident angle of the first concave grating it becomes possible to adjust dispersion compensation degree, using autocorrelation function analyzer
The laser pulse width that observation comes from optical fiber collimator output, adjustment two above parameter will be it is possible to will go out from optical fiber collimator
The pulse width of the laser coming is transferred to 100fs.Compare to compensating dispersion method with using prism, using grating to can save
Save space, improves the whole integrated level detecting light path.
The present invention is a kind of Terahertz coherence detector, needs to be integrated into the terahertz that 800nm femto-second laser excites
Hereby go its effect of competence exertion in coherent detection system.In Terahertz coherent system, typically use beam splitter and femtosecond is swashed
Light is divided into two bundles, a branch of referred to as terahertz sources light path：It is used for exciting terahertz transmitter transmitting THz wave, another bundle is referred to as
Terahertz detection light path：It is used for exciting terahertz detector to detect THz wave.The present invention is just integrated in terahertz detection light path
In, will be used for exciting the femtosecond laser of terahertz detector to be incorporated in the present invention, the excited state of optical probe is transferred to
Optimum state, completes the regulation of terahertz detector.Terahertz transmitter can use guide emission antenna, using a face parabolic
The THz wave that face mirror is emitted reflexes on optical probe vertically upward, puts into sample to be tested below optical probe
Product, it is possible to drive two-dimentional motorized precision translation stage to complete the scan function to THz electric field, optical probe are just approached sample surfaces
With direct detection near field, and then high spatial resolution scan can be completed.
In a word, the present invention is a kind of high spatial resolution terahertz detector based on the coupling of 800nm optical fiber, and here is invented
Middle use optical fiber, can increase the flexibility ratio of terahertz detection module, can improve the spatial resolution of system using probe, can be by it
Apply in the Terahertz coherent detection system that 800nm femtosecond laser excites, had using the integrated Terahertz system of the present invention
The spatial resolution of sub-wavelength, and flexibly and easily, kinds of experiments demand can be met, not only there is the ability of terahertz light analysis of spectrum
Also there is terahertz imaging function, in Terahertz scientific research field, there is very high practical value, this to Terahertz surface wave device,
The research fields such as Terahertz Meta Materials, electronics, biology all have and have very important significance.
Specific embodiment：
1st, a kind of based on 800nm optical fiber coupling high spatial resolution terahertz detector be made up of following nine kinds of devices：
Grating 1-a, 1-b, fiber coupler 2, optical fiber 3, optical fiber collimator 4, short focus lens 5, reflecting mirror 6-a, 6-b, 6-c, 6-d, too
Hertz optical probe 7, lifting platform 8, two-dimentional motorized precision translation stage 9.
2nd, free for 800nm space laser is shone the position on the upper side in the first concave grating 1-a, put parallel to grating 1-a
Grating 1-b, laser passes through grating 1-a and grating 1-b and reaches reflecting mirror 6-b, adjusts reflecting mirror 6-a, and laser vertical is anti-downwards
It is incident upon reflecting mirror 6-b, adjust reflecting mirror 6-b, laser is back to the position on the lower side in grating 1-b and 1-a.
3rd, adjust reflecting mirror 6-c, the laser out of the position on the lower side from grating 1-a reflexes to optical fiber by reflecting mirror 6-c
Bonder 2, adjusts fiber coupler 2, laser is introduced optical fiber, and from optical fiber collimator 4 out.
4th, observation is from optical fiber collimator 4 out laser pulse width, adjust the relative distance of grating 1-a and grating 1-b with
And incide laser light incident angle on grating 1-a, from optical fiber collimator 4, out laser pulse width reaches 100fs.
5th, optical fiber collimator 4, short focus lens 5, reflecting mirror 6-d and Terahertz optical probe 7 are arranged on liter from top to bottom
On fall platform 8, lifting platform 8 is arranged on two-dimentional motorized precision translation stage 9.
6th, coarse adjustment short focus lens 5 and reflecting mirror 6-d, makes laser focusing to the needle point of Terahertz optical probe 7, and fine setting is short
Focus lens 5 and reflecting mirror 6-d, make the photoelectric current that Terahertz optical probe 7 exports maximum.
7th, by whole, coherent detection system is applied to based on the high spatial resolution terahertz detector of 800nm optical fiber coupling
In, complete THz electric field scanning, step is as follows：
(1) two restraint a branch of being incorporated into based on 800nm optical fiber coupling in laser by what beam splitting chip in coherent detection system was divided into
In the high spatial resolution terahertz detector closing, adjusting another Shu Jiguang light path makes transmitting light path and the Terahertz of Terahertz
Detect light path to match.
(2) two-dimentional motorized precision translation stage 9 is driven to complete the point by point scanning of THz electric field.
This invention is applied in Terahertz coherent detection system, applied range, be capable of Terahertz near field and
The scan function of spatial field, is a kind of effective laboratory facilities of Terahertz research field, this is to Terahertz surface wave device, terahertz
Hereby the research field such as Meta Materials, electronics, biology all has and has very important significance.
[11]Xu Y,Zhang X,Tian Z,et al.Mapping the near-field propagation of
surface plasmons on terahertz metasurfaces[J].Applied Physics Letters,2015,
107(2):021105.
[12]Zhang X,Xu Y,Yue W,et al.Anomalous Surface Wave Launching by
Handedness Phase Control[J].Advanced Materials,2015,27(44):7123-7129.
[13]Zhang X,Xu Q,Li Q,et al.Asymmetric excitation of surface plasmons
by dark mode coupling[J].Science advances,2016,2(2):e1501142.
[14]Wang Q,Zhang X,Xu Y,et al.A Broadband Metasurface‐Based Terahertz
Flat‐Lens Array[J].Advanced Optical Materials,2015,3(6):779-785.
Further describe the present invention with instantiation below in conjunction with the accompanying drawings.
1st, a kind of based on 800nm optical fiber coupling high spatial resolution terahertz detector be made up of following nine kinds of devices：
Grating 1-a, 1-b, fiber coupler 2, optical fiber 3, optical fiber collimator 4, short focus lens 5, reflecting mirror 6-a, 6-b, 6-c, 6-d, too
Hertz optical probe 7, lifting platform 8, two-dimentional motorized precision translation stage 9.
2nd, free for 800nm space laser is shone the position on the upper side in the first concave grating 1-a, put parallel to grating 1-a
Grating 1-b, laser passes through grating 1-a and grating 1-b and reaches reflecting mirror 6-b, adjusts reflecting mirror 6-a, and laser vertical is anti-downwards
It is incident upon reflecting mirror 6-b, adjust reflecting mirror 6-b, laser is back to the position on the lower side in grating 1-b and 1-a.
3rd, adjust reflecting mirror 6-c, the laser out of the position on the lower side from grating 1-a reflexes to optical fiber by reflecting mirror 6-c
Bonder 2, adjusts fiber coupler 2, laser is introduced optical fiber, and from optical fiber collimator 4 out.
4th, observation is from optical fiber collimator 4 out laser pulse width, adjust the relative distance of grating 1-a and grating 1-b with
And incide laser light incident angle on grating 1-a, from optical fiber collimator 4, out laser pulse width reaches 100fs.
5th, optical fiber collimator 4, short focus lens 5, reflecting mirror 6-d and Terahertz optical probe 7 are arranged on liter from top to bottom
On fall platform 8, lifting platform 8 is arranged on two-dimentional motorized precision translation stage 9.
6th, coarse adjustment short focus lens 5 and reflecting mirror 6-d, makes laser focusing to the needle point of Terahertz optical probe 7, and fine setting is short
Focus lens 5 and reflecting mirror 6-d, make the photoelectric current that Terahertz optical probe 7 exports maximum.
7th, by whole, coherent detection system is applied to based on the high spatial resolution terahertz detector of 800nm optical fiber coupling
In, complete THz electric field scanning, step is as follows：
(1) two restraint a branch of being incorporated into based on 800nm optical fiber coupling in laser by what beam splitting chip in coherent detection system was divided into
In the high spatial resolution terahertz detector closing, adjusting another Shu Jiguang light path makes transmitting light path and the Terahertz of Terahertz
Detect light path to match.
(2) two-dimentional motorized precision translation stage 9 is driven to complete the point by point scanning of THz electric field.
Claims (2)
1. a kind of high spatial resolution terahertz detector based on the coupling of 800nm optical fiber, is characterized in that, by grating, optical fiber coupling
Clutch, optical fiber, optical fiber collimator, short focus lens, reflecting mirror, Terahertz optical probe, lifting platform and two-dimentional motorized precision translation stage structure
Become；Wherein, grating, fiber coupler and two-dimentional motorized precision translation stage are displayed on optical table；Optical fiber two ends connect optical fiber respectively
Bonder and optical fiber collimator；Optical fiber collimator, short focus lens, reflecting mirror and optical probe are arranged on lifting platform from top to bottom
On；Lifting platform is arranged on two-dimentional motorized precision translation stage；Optical fiber collimator, short focus lens, reflecting mirror and optical probe are from top to bottom
It is fixed on lifting platform, the laser of laser instrument output is coupled into the connection of optical fibre optical fibre other end through grating, fiber coupler
Optical fiber collimator, optical fiber collimator output light is the femtosecond collimation laser of 800nm；Lifting platform arbitrarily can move in allowed band
Move and do not change light path；Lifting platform is arranged on two-dimentional motorized precision translation stage, enables detector to complete 3-D scanning Terahertz
The function of field；On lifting platform, by adjusting position and the state of optical fiber collimator, short focus lens and reflecting mirror, will be from optical fiber
Collimator light out focuses on the needle point of optical probe, makes the photoelectric current of optical probe reach maximum, so visits photoconduction
The excited state of pin is transferred to optimal so as to detect THz electric field in the best condition.
2. the high spatial resolution terahertz detector based on the coupling of 800nm optical fiber as claimed in claim 1, is characterized in that,
Grating is a pair, and laser is advanced twice back and forth in grating centering, adjusts the relative distance of two gratings and is incident to the first face light
This two parameters of the laser light incident angle of grid, it becomes possible to adjust dispersion compensation degree, are observed from optical fiber collimator using autocorrelation function analyzer
The laser pulse width that output comes, adjusts two above parameter, the pulse width of the laser out from optical fiber collimator is transferred to
100fs about.
Priority Applications (1)
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| JP2008122278A (en) * | 2006-11-14 | 2008-05-29 | Hitachi Ltd | Terahertz spectral diffraction/imaging apparatus |
| CN101871814A (en) * | 2009-04-23 | 2010-10-27 | 中国航天科工集团第二研究院二○七所 | Method for measuring pumping electrooptics of Terahertz impulse energy |
| CN203350184U (en) * | 2013-07-31 | 2013-12-18 | 天津智易时代科技发展有限公司 | Terahertz spectral analysis system |
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| JP2008122278A (en) * | 2006-11-14 | 2008-05-29 | Hitachi Ltd | Terahertz spectral diffraction/imaging apparatus |
| CN101871814A (en) * | 2009-04-23 | 2010-10-27 | 中国航天科工集团第二研究院二○七所 | Method for measuring pumping electrooptics of Terahertz impulse energy |
| CN203350184U (en) * | 2013-07-31 | 2013-12-18 | 天津智易时代科技发展有限公司 | Terahertz spectral analysis system |
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| XU, YUEHONG等: "Mapping the near-field propagation of surface plasmons on terahertz metasurfaces", 《APPLIED PHYSICS LETTERS》 * |
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