CN208224601U - A kind of high speed optical delay line - Google Patents
A kind of high speed optical delay line Download PDFInfo
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- CN208224601U CN208224601U CN201820605648.5U CN201820605648U CN208224601U CN 208224601 U CN208224601 U CN 208224601U CN 201820605648 U CN201820605648 U CN 201820605648U CN 208224601 U CN208224601 U CN 208224601U
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- corner cube
- cube mirror
- group
- fixed
- delay line
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- 230000003287 optical effect Effects 0.000 title claims abstract description 37
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 4
- 238000007747 plating Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 abstract description 7
- 238000001328 terahertz time-domain spectroscopy Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 229910007709 ZnTe Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Abstract
The utility model discloses a kind of high speed optical delay line, including linear electrical displacement platform, mobile corner cube mirror group, fixed corner cube mirror group, wherein, mobile corner cube mirror group is fixed on the sliding table of linear electrical displacement platform, fixed corner cube mirror group is fixed, the logarithm of corner cube mirror may be the same or different in mobile corner cube mirror group and fixed corner cube mirror group, and specific number can require setting according to system light path structure and optical scanner delay.The high speed optical delay line can realize higher scanning speed and biggish scanning range under the lower movement speed of linear electricity driving displacement platform and lesser stroke.
Description
Technical field
The utility model belongs to optical scanning technique field, is related to optical delay device, and especially a kind of high speed optical prolongs
Slow line, the high speed optical delayed sweep suitable for terahertz time-domain spectroscopy system and Electro Optic Sampling System.
Background technique
In terahertz time-domain spectroscopy system and Electro Optic Sampling System, require to change using variable optical delay means
Relative delay between two-way light realizes scanning and detection of the ultrashort light pulse to impulse waveform to be measured.Currently used optics
Delaying means mainly linear electricity driving displacement platform, circle involute, optical fiber expansion bend and asynchronous optical sampling etc., wherein linear
For electricity driving displacement platform due to easy to use, sweep length is unrestricted, advantage of lower cost, is most common method.At this
In method, usually two corner cube mirrors are fixed on displacement platform, light beam occur through two secondary reflections it is primary round-trip, make light path with
The movement of displacement platform change, realize the change in relative time delay.In order to guarantee higher displacement accuracy and stationarity, it is displaced
The speed of platform is often lower, and therefore, the single sweep operation time is longer, generally reaches several minutes or more.Especially when needs are swept on a large scale
When retouching, the size of required displacement platform is very big, and sweep time reaches several hours, and measurement efficiency is very low, and whole system
Volume will be very huge.
Therefore, a kind of high speed optical delay line is developed, guarantees higher displacement accuracy while improving speed, and realize
The miniaturization of device all has important value for terahertz time-domain spectroscopy system and Electro Optic Sampling System.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of high speed optical delay line, scanning speed is fast, is displaced
Precision is high, small in size, so as to shorten the sweep time of terahertz time-domain spectroscopy system and Electro Optic Sampling System, improves measurement effect
Rate.
The technical solution of the utility model is as follows:
A kind of high speed optical delay line, including linear electrical displacement platform, mobile corner cube mirror group, fixed corner cube mirror
Group, wherein mobile corner cube mirror group is fixed on the sliding table of linear electrical displacement platform, and fixed corner cube mirror group is fixed
It is motionless.The logarithm of corner cube mirror may be the same or different in mobile corner cube mirror group and fixed corner cube mirror group,
Specific number can require setting according to system light path structure and optical scanner delay.
In the apparatus, wherein the first working method are as follows: incident light one group of corner cube mirror group wherein incident first
On, pass throughNIt is secondary it is round-trip after from the last a piece of corner cube mirror outgoing of another group of corner cube mirror group.If linear electrical displacement platform
By the timetMoving distance beL 0, then the knots modification of light path is within the timeL b=N·L 0, to make the scanning of delay line
Speed improves compared with linear electrical displacement platform movement speedNTimes.
Second of working method are as follows: in incident light one group of corner cube mirror group wherein incident first, pass throughNIt is secondary it is round-trip after
From the last a piece of corner cube mirror outgoing of same group of corner cube mirror group.Which calculation method is complete with first way
Equivalent.
In the optical delay line device, the effect of linear electrical displacement platform is to drive mobile corner cube mirror group according to institute
It needs speed and stroke mobile, gradually changes the relative displacement between mobile corner cube mirror group and fixed corner cube mirror group,
To change the light path of transmitting beam thereon.
In the first working method, mobile corner cube mirror group and fixed corner cube mirror group are respectively by 2NA right angle is anti-
It penetrates microscope group and closes fixed form；In second of working method, wherein one group of corner cube mirror group includes 2NA corner cube mirror, and
Another group comprising 2 (N- 1) a corner cube mirror.Inclined-plane plating and the Wavelength matched height of required reflection laser of each corner cube mirror
Reflectivity film, to reduce the loss of laser power caused by multiple reflections.
The effect and benefit of the utility model are:
(1) the high speed optical delay line, can under the lower movement speed of linear electricity driving displacement platform and lesser stroke,
Realize higher scanning speed and biggish scanning range；
(2) since linear electrical displacement platform speed is lower, it is ensured that higher displacement accuracy；
(3) by reducing the stroke of corner cube mirror and linear electrical displacement platform, it can ensure the same of larger scanning range
When realization device miniaturization.
Detailed description of the invention
Fig. 1 high speed optical delay line schematic illustration.
Fig. 2 typical case's terahertz time-domain spectroscopy systematic schematic diagram.
Fig. 3 uses the terahertz time-domain spectroscopy systematic schematic diagram of this case high speed optical delay line.
In figure: 1 linear electrical displacement platform；2 mobile corner cube mirror groups；3 fixed corner cube mirror groups.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure of description 1, high speed optical delay line includes three parts, respectively linear electrical displacement platform 1, movement
Corner cube mirror group 2 and fixed corner cube mirror group 3, wherein mobile corner cube mirror group 2 is fixed on linear electrical displacement platform 1
Sliding table on, the fixed position installation of fixed corner cube mirror group 3 is motionless.Mobile corner cube mirror group 2 and fixed right angle are anti-
Penetrating every section of a piece of corner cube mirror in perpendicular (coordinate system yz plane) in microscope group 3 is all isosceles right triangle,
And mutual geometric parameter should be all consistent, and the mode in attached drawing 1 is installed to specifications, its inclined-plane is made
For laser reflection face.When installation, the right-angle side of mobile corner cube mirror group 2 and fixed corner cube mirror group 3 in the y-direction is needed as far as possible
In parallel, to ensure that incidence angle of laser light incident when on the inclined-plane of each corner cube mirror is 45 °, so as to scanned
Optical delay amount in journey is accurately controlled.
Embodiment
High speed optical delay line is the important component of terahertz time-domain spectroscopy system, and effect is to pass through mechanical displacement
Or other means change pump light and detect the optical path difference between light, realize to the scanning probe of terahertz pulse waveform.At a high speed
Optical delay line is in the relative mounting location in terahertz time-domain spectroscopy system as shown in Figure of description 3.
Typical terahertz time-domain spectroscopy systematic schematic diagram is as shown in Figure of description 2, the pulsewidth of femto-second laser sending
For tens of fs to 100fs magnitude and polarization state is that the ultra-short pulse laser of linear polarization is divided into two-way by beam splitter, wherein passing through all the way
The signal that acousto-optic modulator is modulated to specific frequency is crossed, is incident on photoconductive day after a series of reflecting mirror M and lens are assembled
On the electrooptical switching of line, the terahertz pulse that pulsewidth is ps magnitude is inspired, is collimated by off axis paraboloidal mirror, using
Off axis paraboloidal mirror is focused on ZnTe crystal.Meanwhile the another way laser pulse that beam splitter separates is after reflecting mirror M reflection
Into optical delay line, the structure of ordinary optical delay line is usually on precision linear electricity driving displacement platform according to special angle
Two corner cube mirrors are fixed, light beam is incident on and is returned afterwards by two secondary reflections along former direction above, by controlling software pair
Electricity driving displacement platform carries out accurate control, can the transmission light path of the road Shi Gai laser beam change, by a series of reflecting mirror M reflections
And after lens are assembled, it is incident on together with THz wave above-mentioned on ZnTe crystal.Since ZnTe crystal is that a kind of electric light is brilliant
Body, its refractive index changes under the modulation of THz wave electric field, i.e. generation birefringence effect, becomes after the wave plate of λ/4
The different elliptically polarized light of two polarized component intensity, can be orthogonal partially by two in elliptically polarized light using Wollaston prism
The component that shakes separates, and detects by light intensity difference of the balanced detector to two orthogonal polarization components.Due to linear electro-optic effect,
The light intensity difference is directly proportional to the intensity of THz wave electric field, so as to realize the detection to terahertz pulse time domain waveform.By
Very poor in the Signal-to-Noise that balanced detector receives, therefore, it is necessary to signal is filtered and is put by lock-in amplifier
Big processing carries out Fourier transform etc. to the terahertz time-domain signal received finally by data collection and transmission
Reason, obtains spectral information to be measured.Wherein, the effect of signal generator is to provide for acousto-optic modulator and lock-in amplifier with reference to frequency
Rate.Optical delay line in the light path system makes light beam that two secondary reflections have occurred wherein and return along former direction.If displacement platform
Stroke be L, ignore the size of corner cube mirror, then its to detection light generate time delay be Δ t=2L/c, wherein c
For the light velocity.
Using the terahertz time-domain spectroscopy system of this case high speed optical delay line, as shown in Figure of description 3, high-speed light is removed
It learns outside delay line, the principle and function of other each sections are identical as the typical terahertz time-domain spectroscopy system in Figure of description 2.
If the stroke of linear electrical displacement platform 1 is similarly L, mobile corner cube mirror quantity on linear electrical displacement platform is 8, then its
The time delay that detection light is generated are as follows: Δ t '=8L/c.It is 4 times of ordinary optical delay line retardation.By increasing right angle
The quantity of reflecting mirror can be such that its retardation further increases.Therefore, in the case where linear 1 stroke of electricity driving displacement platform is constant, this
The high speed optical delay line proposed in invention can be such that retardation greatly increases, and shorten sweep time, to make measurement efficiency significantly
It improves.
Embodiment described above is only that the embodiments of the present invention is described, not to the utility model
Conception and scope be defined.Without departing from the design concept of the present utility model, ordinary people in the field is to this reality
The all variations and modifications made with novel technical solution, should fall within the protection scope of the present utility model, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein, and should not treat any reference in the claims as limiting
Related claim.
Claims (5)
1. a kind of high speed optical delay line, including linear electrical displacement platform (1), mobile corner cube mirror group (2), fixed right angle are anti-
Penetrate microscope group (3), which is characterized in that the mobile corner cube mirror group (2) is fixed on the sliding table of linear electrical displacement platform (1)
On, the fixed position installation of fixed corner cube mirror group (3) is motionless；The mobile corner cube mirror group (2) and fixed right angle
The logarithm of corner cube mirror may be the same or different in reflection microscope group (3), specific number can according to system light path structure and
Optical scanner delay requires setting.
2. a kind of high speed optical delay line according to claim 1, it is characterised in that: working method that there are two types of tools, first
Kind working method, two groups of corner cube mirror groups are respectively by 2NA corner cube mirror combination fixation forms, and incident light beam strikes are wherein
In one group of corner cube mirror group, pass throughNIt is secondary it is round-trip after from the last a piece of corner cube mirror outgoing of another group of corner cube mirror group,
The corner cube mirror number of two groups of corner cube mirror groups is identical in which；Second of working method, one group of corner cube mirror group
Include 2NA corner cube mirror, and another group comprising 2 (N- 1) a corner cube mirror, incident light first it is incident wherein one group it is straight
In corner reflection microscope group, pass throughNIt is secondary it is round-trip after from the last a piece of corner cube mirror outgoing of same group of corner cube mirror group, which
In the corner cube mirror numbers of two groups of corner cube mirror groups differ a pair of.
3. a kind of high speed optical delay line according to claim 1, it is characterised in that: the mobile corner cube mirror group
(2) and in fixed corner cube mirror group (3) the every section of a piece of corner cube mirror in perpendicular is all isosceles right angle trigonometry
Shape, and mutual geometric parameter is all consistent, and using its inclined-plane as laser reflection face.
4. a kind of high speed optical delay line according to claim 3, it is characterised in that: the inclined-plane plating swashs with required reflection
The matched high reflection film of optical wavelength.
5. a kind of high speed optical delay line according to claim 1 or 3, it is characterised in that: the mobile corner cube mirror
When group (2) and fixed corner cube mirror group (3) installation, right-angle side in the horizontal direction needs parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820605648.5U CN208224601U (en) | 2018-04-26 | 2018-04-26 | A kind of high speed optical delay line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820605648.5U CN208224601U (en) | 2018-04-26 | 2018-04-26 | A kind of high speed optical delay line |
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| Publication Number | Publication Date |
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| CN208224601U true CN208224601U (en) | 2018-12-11 |
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| CN201820605648.5U Expired - Fee Related CN208224601U (en) | 2018-04-26 | 2018-04-26 | A kind of high speed optical delay line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398780A (en) * | 2018-04-26 | 2018-08-14 | 中国工程物理研究院计量测试中心 | A kind of high speed optical delay line |
-
2018
- 2018-04-26 CN CN201820605648.5U patent/CN208224601U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398780A (en) * | 2018-04-26 | 2018-08-14 | 中国工程物理研究院计量测试中心 | A kind of high speed optical delay line |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181211 |