CN205843813U - A kind of device of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher - Google Patents
A kind of device of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher Download PDFInfo
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- CN205843813U CN205843813U CN201620584371.3U CN201620584371U CN205843813U CN 205843813 U CN205843813 U CN 205843813U CN 201620584371 U CN201620584371 U CN 201620584371U CN 205843813 U CN205843813 U CN 205843813U
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Abstract
The utility model discloses the device of a kind of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher, excite femtosecond pulse and the detection femtosecond pulse for terahertz pulse time-domain detection that produce for terahertz pulse transmit the most in a fiber, sweep delay line for time domain uses fiber stretcher, use HDR, wide bandwidth data collecting card acquisition and recording terahertz pulse time domain electric field information and be transferred to computer, carry out real time data processing, storage, thus realize the collection of terahertz time-domain pulse signal, process and store.This utility model system uses the design of all-fiber formula to be advantageously implemented integrated, the miniaturization of terahertz time-domain spectroscopy system, use fiber stretcher as time domain sweep delay line, improve tera-hertz spectra detection and imaging rate, and it is integrated to be prone to fibre system, use data collecting card acquisition and recording terahertz pulse time domain electric field information, the real time record of terahertz time-domain pulse information can be realized.
Description
Technical field
The invention belongs to terahertz time-domain spectroscopic technology field, be specifically related to THz wave generation technology, THz wave spy
Survey technology, time domain scanning technique, the present invention is applicable to terahertz time-domain spectroscopy detection and imaging applications.
Background technology
Tera-hertz spectra detection technique has the good characteristics such as the fingerprint spectrality of uniqueness, high-penetrability because of Terahertz, at thing
The field such as reason, chemistry, biomedicine, safety check all has a wide range of applications.At present, the inspection of most commonly used tera-hertz spectra it is applied to
Survey technology is terahertz time-domain spectroscopic technology.Traditional terahertz time-domain spectroscopy system uses walking machinery delay line to change detection
Relative time delay between femtosecond pulse and terahertz pulse, it is achieved whole terahertz time-domain electric field waveform is sampled.Due to
Using phase lock amplifying technology to carry out the detection record of Terahertz electric field signal, the record time of single time delay point measures at tens of ms
Level, therefore, the time domain electric field waveform required time of the detection whole terahertz pulse of record, in a minute magnitude, shows greatly
Actual application limitation.
At present, short scan terahertz time-domain spectroscopic technology mainly has short scan terahertz time-domain based on asynchronous optical sampling
Spectral technique, short scan terahertz time-domain spectroscopic technology based on change chamber optical sampling, short scan based on oscillation delay line are too
Hertz time-domain spectroscopic technology three kinds:
Short scan terahertz time-domain spectroscopic technology based on asynchronous optical sampling, its time domain rate of scanning up to more than KHz,
Time domain sweep limits is more than 100 ps, but it needs two femto-second lasers, involves great expense, and needs to swash for two femtoseconds
Light device synchronizes, and system operation complexity, environmental requirement is high to external world, it is difficult to be used widely in practice；
Short scan terahertz time-domain spectroscopic technology based on change chamber optical sampling, can realize number under 100 Hz rate of scanning
Time domain scanning in the range of ten ps, but the job stability of femto-second laser is required the highest, for the adaptation of working environment by it
Property is poor, shows greatly application limitation the most in practice；
Short scan terahertz time-domain spectroscopic technology based on oscillation delay line, its time domain rate of scanning is low, typically at 10Hz
Magnitude, meanwhile, the femtosecond pulse transmitted in a fiber need to be coupled to free space by it, again by femtosecond after oscillation delay line
Pulse-couple transmits in optical fiber, therefore the collimation of the moving sweep of oscillation delay line is required the highest by it, and shakes environment
Dynamic very sensitive, show greatly application limitation in practice.
Summary of the invention
The invention aims to advance the application in practice of terahertz time-domain spectroscopy detection technique, it is proposed that a kind of
All-fiber formula time domain short scan terahertz light spectral technology based on fiber stretcher, and give the spy of terahertz time-domain pulse signal
Survey extracting method.
The present invention adopts the following technical scheme that
The device of a kind of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher, for terahertz pulse
Excite femtosecond pulse and the detection femtosecond pulse for terahertz pulse time-domain detection that produce transmit the most in a fiber,
Sweep delay line for time domain uses fiber stretcher,
Use HDR, wide bandwidth data collecting card acquisition and recording terahertz pulse time domain electric field information and be transferred to
Computer, carries out real time data processing, storage, thus realizes the collection of terahertz time-domain pulse signal, processes and store.
A kind of scanning system based on technique scheme, including: femto-second laser, the outfan of described femto-second laser
Being connected to fiber coupler by light pricker, the two-way of described fiber coupler output, a road is through non-dispersive fiber transmission link
After be input to optical fiber coupling terahertz transmitter, another road be input to after non-dispersive fiber transmission link optical fiber coupling terahertz
Hereby detector；Arranging a light pricker stretcher between described optical fiber coupling terahertz detector and light pricker bonder, light pricker stretches
The signal end of device couples with optical fiber and is sequentially connected with signal generating source and data collecting card between terahertz detector.
In technique scheme, between described signal generating source with light pricker stretcher, optical fiber couple terahertz detector
It is connected by data wire with between signal generating source.
In technique scheme, described smooth pricker is single-mode fiber or polarization maintaining optical fibre.
In technique scheme, described non-dispersive fiber transmission link include single-mode fiber, wherein the one of polarization maintaining optical fibre
Plant and combine with dispersion compensating fiber.
In technique scheme, comprise the following steps:
The femtosecond pulse of optical fiber femtosecond laser output is divided into two bundles after the fiber coupler that splitting ratio is 50:50；
A branch of excite femtosecond pulse source as terahertz pulse emitter, after non-dispersive fiber transmission link, enter
It is mapped in terahertz pulse emitter；
A branch of detection femtosecond pulse source as terahertz pulse detector, after non-dispersive fiber transmission link, enters
It is mapped in terahertz pulse detector；
Terahertz pulse passes through fiber stretcher, in electricity modulated signal with the relative time-delay of detection femtosecond pulse
Under effect, it is achieved the high speed of relative time-delay, cyclically-varying, Sample acquisition output direct ratio terahertz pulse time domain electric-field strength
The weak current signal of degree；
Terahertz pulse detector output current signal, is converted to voltage signal after low noise amplification；
With HDR, wide bandwidth data collecting card Real-time Collection recording voltage signal, and it is transmitted to computer,
Carry out real time data processing, storage.
In technique scheme, described current signal is by the femtosecond pulse source incided in terahertz pulse detector
Exciting light conducting material produces instantaneous photo-generated carrier, and under terahertz pulse instantaneous electric field effect, results from Terahertz wink
Time the current signal that is directly proportional of electric field intensity.
Compared with prior art, the present invention:
1, system uses the design of all-fiber formula, excites femtosecond pulse and for Terahertz arteries and veins for what terahertz pulse produced
The detection femtosecond pulse rushing time-domain detection transmits the most in a fiber, has an advantage in that the stability that improve femtosecond pulse transmission,
The ambient adaptability of raising system；Meanwhile, all-fiber design is advantageously implemented the integrated, little of terahertz time-domain spectroscopy system
Type；
2, use fiber stretcher as time domain sweep delay line, have an advantage in that time domain rate of scanning is fast, reach as high as
To kHz, thus shorten the single time domain sweep time of terahertz time-domain spectroscopy system, improve tera-hertz spectra detection and imaging speed
Rate, and it is integrated to be prone to fibre system；
3, system uses HDR, wide bandwidth data collecting card acquisition and recording terahertz pulse time domain electric field information,
Having an advantage in that, comparing phase-locked amplification and detect recording technique, signal acquisition rate is fast, can realize terahertz time-domain pulse information
Real time record.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 present invention high-speed time domain based on fiber stretcher scanning tera-hertz spectra technological system structure chart；
Wherein: 1 is optical fiber femtosecond laser；2 is fiber coupler；3 is dispersion compensating fiber；4 is attenuator；5 is light
Fine stretcher；6 is that optical fiber couples terahertz transmitter；7 is that optical fiber couples terahertz detector；8 is off axis paraboloidal mirror；9 are
THz wave；10 is single-mode fiber or polarization maintaining optical fibre；11 is electrical bias source；12 is data collecting card；13 is computer；14
It it is data cable；15 is serial communication line；16 is signal generating source；17 is that data acquisition triggers signal.
Detailed description of the invention
Present invention all-fiber based on fiber stretcher formula time domain short scan terahertz light spectral technology, mainly includes that optical fiber flies
Second laser instrument, femtosecond pulse transmission non-dispersive optical fiber link, optical fiber manifold type terahertz pulse emitter, optical fiber manifold type terahertz
Hereby pulse detector, fiber stretcher and electricity modulated signal occurring source thereof and signals collecting and process part.The most such as
Under:
Optical fiber femtosecond laser: be less than in 1550nm wave band, time domain pulsewidth based on passive mode-locking mechanism output center wavelength
The all-fiber formula femtosecond pulse source of 100 fs, as the femtosecond pulse excitaton source of terahertz pulse emitter and detector
Femtosecond pulse transmission non-dispersive optical fiber link: use single-mode fiber (or polarization maintaining optical fibre) and dispersion compensating fiber phase
In conjunction with mode, it is achieved the total dispersion amount of whole fiber transmission link is zero, i.e. ensure femtosecond pulse through whole optical fiber link
After transmission, its time domain pulsewidth not broadening, is still femtosecond pulse.
Optical fiber manifold type terahertz pulse emitter: based on photoconduction principle, femtosecond pulse exciting light conducting material produces
Instantaneous photo-generated carrier, photo-generated carrier is under Dc bias effect, and accelerated motion forms instantaneous photoelectric current, and then gives off width
Band terahertz pulse.
Optical fiber manifold type terahertz pulse detector: based on photoconduction principle, femtosecond pulse exciting light conducting material produces
Instantaneous photo-generated carrier, photo-generated carrier is under Terahertz instantaneous electric field effect, and accelerated motion forms instantaneous photoelectric current, its value
Size is proportional to the instantaneous electric field intensity of Terahertz, and the sense of current is consistent with Terahertz instantaneous electric field direction, thus realizes too
The detection of hertz pulse instantaneous electric field intensity.
Fiber stretcher and electricity modulated signal occurring source thereof: under electricity modulated signal effect, periodically-varied terahertz
Hereby pulse and the relative time-delay detecting femtosecond pulse, in conjunction with optical fiber manifold type terahertz pulse detector, it is achieved to terahertz
Hereby pulse temporal electric field signal optical sampling detection record.
Signals collecting and process part: first the instantaneous weak current signal that terahertz pulse detector exports is carried out low noise
Sound amplification is converted to voltage signal, then uses HDR, wide bandwidth data collecting card acquisition and recording voltage signal, and real
Time transmission at computer, carry out real time data processing.
Fig. 1 is the entirety of a kind of all-fiber formula time domain short scan terahertz light spectral technology based on fiber stretcher of the present invention
Structure principle chart, its working method is: the femtosecond pulse of optical fiber femtosecond laser output is through optical fiber coupling that splitting ratio is 50:50
Two bundles it are divided into: a branch of excite femtosecond pulse source, through non-dispersive optical fiber chain as terahertz pulse emitter after clutch
Lu Hou, incides in terahertz pulse emitter, and exciting light conducting material produces instantaneous photo-generated carrier, and photo-generated carrier is directly
Doing accelerated motion under stream bias effect, thus give off broadband terahertz pulse, the broadband terahertz pulse of generation is through quasi-optical
Learn after transport module (a pair off axis paraboloidal mirror as shown in Figure 1), focus in terahertz detector；A branch of as terahertz
Hereby the detection femtosecond pulse source of pulse detector, after non-dispersive fiber transmission link, incides terahertz pulse detector
In, excite exciting light conducting material to produce instantaneous photo-generated carrier, and under terahertz pulse instantaneous electric field effect, result from too
The current signal that hertz instantaneous electric field intensity is directly proportional.Terahertz pulse passes through light with the relative time-delay of detection femtosecond pulse
Fine stretcher, under the effect of electricity modulated signal, it is achieved the high speed of relative time-delay, cyclically-varying, thus realize right
The whole time domain electric field signal Sample acquisition of terahertz pulse, the weak current letter of output direct ratio terahertz pulse time domain electric field intensity
Number.Terahertz pulse detector output current signal, is converted to voltage signal after low noise amplification, then uses high dynamic
Scope, wide bandwidth data collecting card Real-time Collection recording voltage signal, and it is transmitted to computer, carry out at real time data
Reason, storage, thus realize the collection of terahertz time-domain pulse signal, process and store.
The invention is not limited in aforesaid detailed description of the invention.The present invention expands to any disclose in this manual
New feature or any new combination, and the arbitrary new method that discloses or the step of process or any new combination.
Claims (5)
1. the device of an all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher, it is characterised in that:
Femtosecond pulse and equal for the detection femtosecond pulse of terahertz pulse time-domain detection is excited for what terahertz pulse produced
Transmit in a fiber,
Sweep delay line for time domain uses fiber stretcher,
Use HDR, wide bandwidth data collecting card acquisition and recording terahertz pulse time domain electric field information and be transferred to calculate
Device, carries out real time data processing, storage, thus realizes the collection of terahertz time-domain pulse signal, processes and store.
2. one kind based on a kind of based on fiber stretcher all-fiber formula time domain short scan tera-hertz spectra described in claim 1
Device, it is characterised in that including: femto-second laser, the outfan of described femto-second laser by light pricker be connected to optical fiber couple
Device, the two-way of described fiber coupler output, a road is input to optical fiber coupling Terahertz after non-dispersive fiber transmission link
Emitter, another road is input to optical fiber coupling terahertz detector after non-dispersive fiber transmission link；Described optical fiber couples
Arranging a light pricker stretcher between terahertz detector and light pricker bonder, the signal end of light pricker stretcher couples too with optical fiber
It is sequentially connected with signal generating source and data collecting card between hertz detector.
The dress of a kind of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher the most according to claim 2
Put, it is characterised in that between described signal generating source with light pricker stretcher, optical fiber couple terahertz detector and signal generating source
Between connected by data wire.
The dress of a kind of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher the most according to claim 2
Put, it is characterised in that described smooth pricker is single-mode fiber or polarization maintaining optical fibre.
The dress of a kind of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher the most according to claim 2
Put, it is characterised in that described non-dispersive fiber transmission link includes single-mode fiber, the one of which of polarization maintaining optical fibre and dispersion compensation
Optical fiber combines.
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| CN201620584371.3U CN205843813U (en) | 2016-06-16 | 2016-06-16 | A kind of device of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher |
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| CN201620584371.3U CN205843813U (en) | 2016-06-16 | 2016-06-16 | A kind of device of all-fiber formula time domain short scan tera-hertz spectra based on fiber stretcher |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910707A (en) * | 2016-06-16 | 2016-08-31 | 中国工程物理研究院流体物理研究所 | All-fiber time domain terahertz spectroscopy rapid scanning method based on optical fiber stretcher |
| CN108254336A (en) * | 2018-03-30 | 2018-07-06 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of terahertz light spectrometer |
| CN108801969A (en) * | 2018-03-30 | 2018-11-13 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of Terahertz detection device |
| CN108828764A (en) * | 2018-03-30 | 2018-11-16 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of optical-fiber drawing device and optical fiber delay scanning system |
| CN112235051A (en) * | 2020-08-13 | 2021-01-15 | 华中科技大学 | Terahertz frequency sweeping source and system |
-
2016
- 2016-06-16 CN CN201620584371.3U patent/CN205843813U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105910707A (en) * | 2016-06-16 | 2016-08-31 | 中国工程物理研究院流体物理研究所 | All-fiber time domain terahertz spectroscopy rapid scanning method based on optical fiber stretcher |
| CN108254336A (en) * | 2018-03-30 | 2018-07-06 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of terahertz light spectrometer |
| CN108801969A (en) * | 2018-03-30 | 2018-11-13 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of Terahertz detection device |
| CN108828764A (en) * | 2018-03-30 | 2018-11-16 | 深圳市华讯方舟太赫兹科技有限公司 | A kind of optical-fiber drawing device and optical fiber delay scanning system |
| CN108254336B (en) * | 2018-03-30 | 2021-06-08 | 深圳市重投华讯太赫兹科技有限公司 | Terahertz spectrometer |
| CN112235051A (en) * | 2020-08-13 | 2021-01-15 | 华中科技大学 | Terahertz frequency sweeping source and system |
| CN112235051B (en) * | 2020-08-13 | 2022-02-18 | 华中科技大学 | Terahertz frequency sweeping system |
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