CN110411587A - One kind stretching imaging device and method based on pulse modulated ultrafast time domain - Google Patents
One kind stretching imaging device and method based on pulse modulated ultrafast time domain Download PDFInfo
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- 239000006185 dispersion Substances 0.000 claims description 28
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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
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
Abstract
The invention belongs to high-speed imaging technology fields, it discloses a kind of stretch based on pulse modulated ultrafast time domain and device and method is imaged, it will be by the pulse branch of observation object by coupler, and using the synchronous two-way that generates of arbitrary waveform generator there is the square wave of identical frequency, different phase shifts to be respectively acting on two electrooptic modulators, so that two electrooptic modulators are respectively to per the selection of femtosecond pulse separately all the way.The present invention solves the problems, such as the mutual limitation between the imaging frame speed and superelevation sample rate of the ultra-fast optical stretched in the prior art based on time domain imaging, it under the premise of not sacrificing the picture quality of acquisition, can not only increase the frame speed of system but also reduce the sample rate of high-speed oscilloscope.
Description
Technical field
The present invention relates to high-speed imaging technology fields, more particularly to a kind of stretched based on pulse modulated ultrafast time domain to be imaged
Device and method.
Background technique
The hot spot that high speed imaging has become a research attracts extensive concern, and more and more fields such as laser is burnt
Erosion, nervous activity, intracellular chemistry reaction etc., need the imaging frame speed of superelevation to meet the requirement of temporal resolution.Currently,
CCD and CMOS is the tool of most common observation quick events, and quick development has been obtained, and imaging frame speed can reach
1MHz, but it is not still able to satisfy the demand of many applications.For scientific research, usually using having picosecond even femtosecond time
The pump probe technology of resolution ratio, but it can only observe repeatable event and cannot observe and primary or not reproducible thing only occurs
Part, such as optics shock wave.It detects such event and needs a quick, real-time, continuous imaging device.
Recently, a kind of ultra-fast optical imaging method stretched based on time domain is had been carried out as emerging optical image technology
To be more than the frame speed continuous high speed imaging of 1GHz.The important feature of the imaging method is spatial information-pulse frequency spectrum-time domain
The mapping of waveform.In mapping process, two switch process are critically important, and the first step is frequency-space transformation, to pass through space color
It dissipates device the spatial information of imageable target is mapped on the frequency spectrum of pulse.Second step is frequency-time transformation, to pass through dispersion
The spectrum information of pulse is mapped in time domain waveform by Fourier transform.It is clear quasi- in order to be obtained under higher imaging frame speed
True image simultaneously realizes high spatial resolution, and the accuracy of frequency-time mapping process is extremely important.Firstly, it is necessary to enough
Group velocity dispersion accurately indicates pulse code spectrum to ensure that time domain stretches waveform, but too big group velocity dispersion can cause arteries and veins
Overlapping between punching, so that the image fault obtained, therefore unconfined cannot stretch in the time domain pulse.Secondly, imaging system
System needs the high-speed oscilloscope with superelevation sample rate to stretch waveform to retrieve time domain.However, using state-of-the-art high speed
Oscillograph inevitably leads to high cost and limits its widely application.The frame speed of the imaging system is equal to laser
Repetition rate needs higher sample rate to obtain higher imaging frame speed.Therefore, the figure obtained in not sacrificial system
Under the premise of image quality amount, it not only can increase system imaging frame speed but also the sample rate of high-speed oscilloscope can be reduced to the imaging method
It is widely used and has a very important significance.
Therefore, currently there is an urgent need to both can increase and be based under the premise of a kind of picture quality obtained in not sacrificial system
The device and method that the ultra-fast optical system imaging frame speed that time domain stretches can reduce the sample rate of high-speed oscilloscope again, so that
The imaging system is widely applied.
Summary of the invention
Device and method is imaged by providing a kind of stretch based on pulse modulated ultrafast time domain in the embodiment of the present application, solves
Mutual limitation between the imaging frame speed and superelevation sample rate of the ultra-fast optical imaging stretched in the prior art based on time domain
The problem of.
The embodiment of the present application provides a kind of based on pulse modulated ultrafast time domain stretching imaging device, comprising: femtosecond laser
Device, the first diffraction grating, focus pack, collection assembly, the second diffraction grating, coupler, the first modulation and time domain stretching assembly,
Second modulation and time domain stretching assembly, arbitrary waveform generator, high-speed oscilloscope, computer；
Between the femto-second laser and the focus pack, observation object is located at described first diffraction grating
Between focus pack and the collection assembly, second diffraction grating between the collection assembly and the coupler,
The coupler is separately connected first modulation and time domain stretching assembly, second modulation and time domain stretching assembly, described
First modulation and time domain stretching assembly, second modulation and time domain stretching assembly are connect with the high-speed oscilloscope respectively, institute
High-speed oscilloscope is stated to connect with the computer；
First modulation and time domain stretching assembly include the first electrooptic modulator, the first single mode optical fiber, the spy of the first photoelectricity
Device is surveyed, and is sequentially connected；Second modulation and time domain stretching assembly include the second electrooptic modulator, the second single mode optical fiber, the
Two photodetectors, and be sequentially connected；
The input terminal of the arbitrary waveform generator is connect with the femto-second laser, the arbitrary waveform generator it is defeated
Outlet is connect with first electrooptic modulator, second electrooptic modulator respectively.
Preferably, first modulation and time domain stretching assembly further include the first erbium-doped fiber amplifier, and described second adjusts
System and time domain stretching assembly further include the second erbium-doped fiber amplifier；First erbium-doped fiber amplifier is coupled with described respectively
Device, first electrooptic modulator connection, second erbium-doped fiber amplifier respectively with the coupler, second electric light
Modulator connection.
Preferably, described to be based on pulse modulated ultrafast time domain to stretch imaging device further including first collimator, the second standard
Straight device；The first collimator is between the femto-second laser and first diffraction grating, second collimator position
Between second diffraction grating and the coupler.
Preferably, described to be based on pulse modulated ultrafast time domain to stretch imaging device further including low-pass filter；It is described low
The input terminal of bandpass filter is connect with the femto-second laser, and the output end of the low-pass filter and the random waveform occur
Device connection.
Preferably, the focus pack includes the first plano-convex lens, the second plano-convex lens, the first display object lens, and described the
One plano-convex lens, second plano-convex lens, described first show that the primary optical axis of object lens is parallel or is overlapped；The collection assembly packet
Include the second display object lens, third plano-convex lens, the 4th plano-convex lens, the second display object lens, the third plano-convex lens, institute
It states the primary optical axis of the 4th plano-convex lens in parallel or is overlapped.
The embodiment of the present application provides a kind of based on pulse modulated ultrafast time domain stretching imaging method, comprising the following steps:
Step 1 generates femtosecond pulse by femto-second laser, and is incident on the first diffraction grating；
The femtosecond pulse spatially dispersion is formed the one-dimensional dispersion pulse of line style by step 2, first diffraction grating,
And focused on observation object by focus pack, the surface information of observation object is encoded to the one-dimensional dispersion pulse of the line style
Spectrally, space encoding pulse is formed；
Step 3 is collected the space encoding pulse by collection assembly, and is incident on the second diffraction grating；
The space encoding pulse is reduced to pulse, and switch-in coupler by step 4, second diffraction grating；
The pulse is divided into the first pulse, the second pulse by step 5, the coupler, and is separately input into the first electricity
Optical modulator, the second electrooptic modulator；The arbitrary waveform generator generates first party under the triggering of the femto-second laser
Wave signal, the second square-wave signal, first square-wave signal and second square-wave signal have identical frequency, different phase shifts；
First electrooptic modulator is modulated first pulse according to first square-wave signal, passes through the first single mode optical fiber
To first pulse carry out time domain stretching, by the first photodetector will first pulses switch for analog electrical signal simultaneously
It is transmitted to high-speed oscilloscope；Second electrooptic modulator adjusts second pulse according to second square-wave signal
System carries out time domain stretching to second pulse by the second single mode optical fiber, by the second photodetector by second arteries and veins
Red switch is changed to analog electrical signal and is transmitted to high-speed oscilloscope；
Analog electrical signal is converted to digital electric signal by step 6, the high-speed oscilloscope, and is transmitted to computer；It is described
Digital electric signal described in computer disposal obtains image, and stores to described image.
Preferably, in the step 5, before first pulse input to the first electrooptic modulator, bait is mixed by first
Fiber amplifier amplifies compensation to first pulse；Before second pulse input to the second electrooptic modulator, lead to
It crosses the second EDFA Erbium-Doped Fiber Amplifier and compensation is amplified to second pulse.
Preferably, in the step 1, the femtosecond pulse is incident to described first after first collimator is collimated and spreads out
It penetrates on grating；In the step 4, the pulse accesses the coupler after the second collimator is collimated.
Preferably, in the step 5, the electric signal of the electricity output port output of the femto-second laser passes through low-pass filtering
After device carries out low-pass filtering, as the trigger signal of the arbitrary waveform generator, triggers the arbitrary waveform generator and generate
First square-wave signal, the second square-wave signal.
Preferably, in the step 2, the one-dimensional dispersion pulse of line style passes sequentially through the first plano-convex lens, the second plano-convex
Lens, the first microcobjective focus on observation object；
The observation object is placed on one-dimensional motorized precision translation stage, the moving direction of the one-dimensional motorized precision translation stage with it is described
The direction of the one-dimensional dispersion pulse of line style is vertical；Or the observation object is placed in microfluidic channel, the stream of the microfluid
Dynamic direction is vertical with the direction of the one-dimensional dispersion pulse of the line style；
In the step 3, the space encoding pulse passes sequentially through the second microcobjective, third plano-convex lens, Siping City
Convex lens is incident to second diffraction grating.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
In the embodiment of the present application, it will be sent out by the pulse branch of observation object, and using random waveform by coupler
There is the synchronous two-way that generates of raw device the square wave of identical frequency, different phase shifts to be respectively acting on two electrooptic modulators, even if electricity consumption
Optical modulator respectively therefore can be in the image matter for not sacrificing acquisition to the selection carried out separately per femtosecond pulse all the way
Under the premise of amount, the frame speed of system was not only increased but also had reduced the sample rate of high-speed oscilloscope, so that the imaging method is by wider
General application.In addition, the instrument in imaging device is common instrument, realized convenient for system.
Detailed description of the invention
It, below will be to needed in embodiment description in order to illustrate more clearly of the technical solution in the present embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is one embodiment of the present of invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is that a kind of structure for stretching imaging device based on pulse modulated ultrafast time domain provided in an embodiment of the present invention is shown
It is intended to；
Fig. 2 is that one kind provided in an embodiment of the present invention is reconstituted based on pulse modulated ultrafast time domain stretching imaging method middle arteries
The schematic illustration of system and selection.
Wherein, 101- femto-second laser, 102- first collimator, the first diffraction grating of 103-, the first plano-convex lens of 104-,
The second plano-convex lens of 105-, the first microcobjective of 106-, 107- observation object, the second microcobjective of 108-, 109- third plano-convex
Lens, the 4th plano-convex lens of 110-, the second diffraction grating of 111-, the second collimator of 112-, 113- coupler, 114- first mix bait
Fiber amplifier, the second EDFA Erbium-Doped Fiber Amplifier of 115-, the first electrooptic modulator of 116-, the second electrooptic modulator of 117-, 118-
First single mode optical fiber, the second single mode optical fiber of 119-, the first photodetector of 120-, the second photodetector of 121-, 122- high speed
Oscillograph, 123- low-pass filter, 124- arbitrary waveform generator, 125- computer.
Specific embodiment
The present invention provides one kind to stretch imaging device based on pulse modulated ultrafast time domain, specifically includes that femtosecond laser
Device, the first diffraction grating, focus pack, collection assembly, the second diffraction grating, coupler, the first modulation and time domain stretching assembly,
Second modulation and time domain stretching assembly, arbitrary waveform generator, high-speed oscilloscope, computer.
Wherein, first diffraction grating is between the femto-second laser and the focus pack, observation object position
Between the focus pack and the collection assembly, second diffraction grating is located at the collection assembly and the coupler
Between, the coupler is separately connected first modulation and time domain stretching assembly, second modulation and time domain stretching assembly,
First modulation and time domain stretching assembly, second modulation and time domain stretching assembly connect with the high-speed oscilloscope respectively
It connects, the high-speed oscilloscope is connect with the computer.
First modulation and time domain stretching assembly include the first electrooptic modulator, the first single mode optical fiber, the spy of the first photoelectricity
Device is surveyed, and is sequentially connected；Second modulation and time domain stretching assembly include the second electrooptic modulator, the second single mode optical fiber, the
Two photodetectors, and be sequentially connected.
The input terminal of the arbitrary waveform generator is connect with the femto-second laser, the arbitrary waveform generator it is defeated
Outlet is connect with first electrooptic modulator, second electrooptic modulator respectively.
Imaging method is stretched based on pulse modulated ultrafast time domain correspondingly, the present invention provides one kind, mainly include with
Lower step:
Step 1 generates femtosecond pulse by femto-second laser, and is incident on the first diffraction grating；
The femtosecond pulse spatially dispersion is formed the one-dimensional dispersion pulse of line style by step 2, first diffraction grating,
And focused on observation object by focus pack, the surface information of observation object is encoded to the one-dimensional dispersion pulse of the line style
Spectrally, space encoding pulse is formed；
Step 3 is collected the space encoding pulse by collection assembly, and is incident on the second diffraction grating；
The space encoding pulse is reduced to pulse, and switch-in coupler by step 4, second diffraction grating；
The pulse is divided into the first pulse, the second pulse by step 5, the coupler, and is separately input into the first electricity
Optical modulator, the second electrooptic modulator；The arbitrary waveform generator generates first party under the triggering of the femto-second laser
Wave signal, the second square-wave signal, first square-wave signal and second square-wave signal have identical frequency, different phase shifts；
First electrooptic modulator is modulated first pulse according to first square-wave signal, passes through the first single mode optical fiber
To first pulse carry out time domain stretching, by the first photodetector will first pulses switch for analog electrical signal simultaneously
It is transmitted to high-speed oscilloscope；Second electrooptic modulator adjusts second pulse according to second square-wave signal
System carries out time domain stretching to second pulse by the second single mode optical fiber, by the second photodetector by second arteries and veins
Red switch is changed to analog electrical signal and is transmitted to high-speed oscilloscope；
Analog electrical signal is converted to digital electric signal by step 6, the high-speed oscilloscope, and is transmitted to computer；It is described
Digital electric signal described in computer disposal obtains image, and stores to described image.
I.e. the present invention will be produced by coupler by the pulse branch of observation object, and using arbitrary waveform generator is synchronous
There is raw two-way the square wave of identical frequency, different phase shifts to be respectively acting on two electrooptic modulators, i.e., is occurred using random waveform
Device and electrooptic modulator therefore can be in the images for not sacrificing acquisition to the selection carried out separately per femtosecond pulse all the way
Under the premise of quality, the frame speed of system was not only increased but also had reduced the sample rate of high-speed oscilloscope.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
It present embodiments provides one kind and imaging device is stretched based on pulse modulated ultrafast time domain, as shown in Figure 1, comprising:
Femto-second laser 101, first collimator 102, the first diffraction grating 103, the first plano-convex lens 104, the second plano-convex lens 105,
First microcobjective 106, the second microcobjective 108, third plano-convex lens 109, the 4th plano-convex lens 110, the second diffraction grating
111, the second collimator 112, coupler 113, the first EDFA Erbium-Doped Fiber Amplifier 114, the second EDFA Erbium-Doped Fiber Amplifier 115, first
Electrooptic modulator 116, the second electrooptic modulator 117, the first single mode optical fiber 118, the second single mode optical fiber 119, the first photodetection
Device 120, the second photodetector 121, high-speed oscilloscope 122, low-pass filter 123, arbitrary waveform generator 124, computer
125。
The femto-second laser 101 is connect with the first collimator 102；First diffraction grating 103 is with a spacing
From (such as d1=15.58mm) and angle (such as θ1=600) it is placed in the front of the first collimator 102；First plano-convex
(such as the d at a certain distance of lens 1042=100mm) and angle (such as θ2=150) it is placed in first diffraction grating 103
Front；Second plano-convex lens 105 (such as d at a certain distance3=150mm) it is placed in first plano-convex lens in parallel
104 front；First microcobjective 106 (such as d at a certain distance4=50mm) to be placed in second plano-convex in parallel saturating
The front of mirror 105；(such as the d at a certain distance of observation object 1075=10mm) it is placed in first microcobjective 106 in parallel
Front；Second microcobjective 108 (such as d at a certain distance6=10mm) it is placed in the observation object 107 in parallel
Front；The third plano-convex lens 109 (such as d at a certain distance7=50mm) it is placed in second microcobjective 108 in parallel
Front；4th plano-convex lens 110 (such as d at a certain distance8=150mm) it is placed in the third plano-convex lens 109
Front；Second diffraction grating 111 (such as d at a certain distance9=100mm) and angle (such as θ3=150) it is placed in institute
State the front of the 4th plano-convex lens 110；Second collimator 112 (such as d at a certain distance10=15.58mm) and angle
(such as θ4=600) it is placed in the front of second diffraction grating 111；The coupler 113 connects with second collimator 112
It connects；The coupler 113, first EDFA Erbium-Doped Fiber Amplifier 114, first electrooptic modulator 116, first single mode
Optical fiber 118, first photodetector 120 are sequentially connected in series；The coupler 113, second erbium-doped fiber amplification
Device 115, second electrooptic modulator 117, second single mode optical fiber 119, second photodetector 121 are sequentially connected in series
Connection；The femto-second laser 101, the low-pass filter 123, the arbitrary waveform generator 124 are sequentially connected in series；Institute
Arbitrary waveform generator 124 is stated to connect with first electro-optical detector 116 and second electro-optical detector 117 respectively；Institute
High-speed oscilloscope 122 is stated to connect with first electro-optical detector 120 and second electro-optical detector 121 respectively；The meter
Calculation machine 125 is connect with the high-speed oscilloscope 122.
The femto-second laser 101 is for generating femtosecond pulse；The first collimator 102 is used for femtosecond pulse from one
Fixed angle is incident to first diffraction grating 103 in the form of spatial light；First diffraction grating 103 is by femtosecond pulse
Dispersion in space；The femtosecond pulse of spatial dispersion passes through first plano-convex lens 104, second plano-convex lens 105, institute
It is focused on the observation object 107 after stating the first microcobjective 106, spectrally to femtosecond pulse by body surface information coding
Complete space encoding；The femtosecond pulse of space encoding is by second microcobjective 108, the third plano-convex lens 109, described
4th plano-convex lens 110 are incident on second diffraction grating 111 after collecting；Second diffraction grating 111 is by space color
Scattered pulse is reduced to pulse；Second collimator 112 is by the pulse coupled into optical fibres of reduction；The coupler 113
The pulse that will be coupled into optical fiber is divided into two-way；First EDFA Erbium-Doped Fiber Amplifier 114 and second EDFA Erbium-Doped Fiber Amplifier
115 pairs per pulse amplifying all the way with compensated pulse power loss；The low-pass filter 123 is to the femto-second laser 101
Output electric signal does low-pass filtering, and is used as the trigger signal of the arbitrary waveform generator 124；The arbitrary waveform generator
124 generate the square-wave signal that two-way has identical frequency, different phase shifts, are exported respectively to 116 He of the first electrooptic modulator
Second electrooptic modulator 117；First electrooptic modulator 116 and second electrooptic modulator 117 are respectively to each
Road impulse modulation is with strobe pulse separately；First single mode optical fiber 118 and second single mode optical fiber 119 are respectively to one
Road pulse carries out time domain stretching, completes the duplication of pulse spectrum to time domain waveform；First photodetector 120 and described
Two electro-optical detectors 121 will pulses switch be all the way respectively analog electrical signal；The high-speed oscilloscope 122 will be per simulation electricity all the way
Signal is converted to digital electric signal；The computer disposal 125 handles the digital electric signal that the high-speed oscilloscope 122 acquires and obtains
It is stored to image, and to image.
Specifically, 101 type selecting of femto-second laser is center wavelength 1550nm, spectrum width 30nm, pulsewidth 100fs, again
The pulse laser of complex frequency 100MHz；102 type selecting of first collimator is the F260FC-1550 of Thorlabs；Described
One diffraction grating, 103 type selecting is incisure density 600/mm；First plano-convex lens, 104 type selecting is focal length f=100mm, described
Second plano-convex lens, 105 type selecting is focal length f=50mm；First microcobjective, 106 type selecting is numerical aperture 0.65, times magnification
Rate 50x；The observation object 107 is located on one-dimensional motorized precision translation stage or in microfluidic channel；Second microcobjective 108
Type selecting is numerical aperture 0.65, enlargement ratio 50x；109 type selecting of third plano-convex lens is focal length f=50mm；Described 4th
110 type selecting of plano-convex lens is focal length f=100mm；Second diffraction grating, 111 type selecting is incisure density 600/mm；Described
Two collimators, 112 type selecting is the F260FC-1550 of Thorlabs；113 type selecting of coupler is coupling ratio 50:50's
The TW1550R5F1 of thorlabs；First EDFA Erbium-Doped Fiber Amplifier, 114 type selecting is operation wavelength 1550nm wave band；Described
Two EDFA Erbium-Doped Fiber Amplifiers, 115 type selecting is operation wavelength 1550nm wave band；First electrooptic modulator, 116 type selecting is 1550nm
The Mach-Zehnder modulators of wave band；Second electrooptic modulator, 117 type selecting is the Mach-Zehnder tune of 1550nm wave band
Device processed；First single mode optical fiber, 118 type selecting is the single mode optical fiber that group velocity dispersion is 550ps/nm；Second single mode optical fiber
119 type selectings are the single mode optical fiber that group velocity dispersion is 550ps/nm；First photodetector, 120 type selecting is Thorlabs's
DET01CFC/M；Second photodetector, 121 type selecting is the DET01CFC/M of Thorlabs；The high-speed oscilloscope 122
Type selecting is the DSA91304A that the U.S. is Deco skill；123 type selecting of low-pass filter is the U.S.
The SLP-100+ of Mini-Circuits company；124 type selecting of arbitrary waveform generator is that the U.S. is Deco skill
M8195A；The computer 125 is server.
Below with reference to Fig. 1 and Fig. 2, to provided in this embodiment a kind of based on pulse modulated ultrafast time domain stretching imaging side
Method is described further, comprising the following steps:
Step 1: the femto-second laser 101 generates femtosecond pulse, wherein a length of 1550nm of cardiac wave, bandwidth 30nm, arteries and veins
Width is 100fs, repetition rate 100MHz, and the frame rate of imaging is equal to the repetition rate of pulse, realizes the imaging speed of 100MHz
Degree.Femtosecond pulse is incident on first diffraction grating from certain angle by the first collimator 102 in the form of spatial light
On 103.
Step 2: incident femtosecond pulse spatially dispersion is formed the one-dimensional dispersion of line style by first diffraction grating 103
Pulse；First plano-convex lens 104, second plano-convex lens 105, first microcobjective 106 are by the one-dimensional color of line style
Pulse concentration is dissipated on the observation object 107, and the observation object 107 can be placed on one-dimensional motorized precision translation stage or be located at micro-
In fluid channel, the moving direction of motorized precision translation stage or the flow direction of microfluid are vertical with pulse dispersion direction, when the sight
Object 107 is surveyed when high-speed mobile, the different location of the observation object 107 is illuminated in the one-dimensional dispersion pulse of line style, by institute
The surface information for stating observation object 107 is encoded to the one-dimensional dispersion pulse of line style spectrally, realizes frequency and space reflection, complete
At space encoding.
Step 3: second microcobjective 108, the third plano-convex lens 109, the 4th plano-convex lens 110 are collected
Pulse is simultaneously incident on second diffraction grating 111 by the pulse of space encoding.
Step 4: the pulse of spatial dispersion is reduced to pulse by second diffraction grating 111；Second collimator
112 is fine by the pulse coupling entering light of reduction.
Step 5: coupling ratio is that the pulse that 113 will be coupled into optical fiber is divided into identical two-way by the coupler of 50:50；
It is carried out respectively to per pulse all the way by first EDFA Erbium-Doped Fiber Amplifier 114 and second EDFA Erbium-Doped Fiber Amplifier 115
The power loss when observation object 107 and optical lens is passed through in amplification with compensated pulse；The low-pass filter 123 is right
The electric signal of the electricity output port output of the femto-second laser 101 does low-pass filtering, as the arbitrary waveform generator 124
Trigger signal；It is synchronous to produce after the arbitrary waveform generator 124 receives the trigger signal from the low-pass filter 123
Raw two-way has the square-wave signal of identical frequency, different phase shifts, and is transferred to first electrooptic modulator 116 and described respectively
Second electrooptic modulator 117, the frequency of square-wave signal are the half of the femto-second laser repetition rate, the amplitude of square-wave signal
From 0 to 500mV；First electrooptic modulator 116 and second electrooptic modulator 117 are sent out according to from the random waveform
The square-wave signal of raw device 124 is modulated to per pulse all the way respectively, so that respectively can choosing separately on per pulse all the way
Select pulse, first pulse selected of two-way pulse be in original pulse sequence it is adjacent in time domain, as shown in Figure 2；Institute
It states the first single mode optical fiber 118 and second single mode optical fiber 119 and carries out time domain stretching to per pulse all the way respectively, realize frequency
To the mapping of time domain, the duplication of pulse spectrum to time domain waveform is completed；First photodetector 120 and second electric light
Detector 121 will be respectively analog electrical signal per pulses switch all the way, and be transferred to the high-speed oscilloscope 122.
Step 6: the high-speed oscilloscope 122 will be converted to digital electric signal per analog electrical signal all the way, and number is believed
Number it is transmitted to the computer 125.The computer 125 handles the digital electric signal that the transmission of high-speed oscilloscope 122 comes and obtains
It is stored to image, and to image.
To sum up, the component in above-mentioned imaging device and method is all common component, is easy to implement, while passing through coupling
Device will have identical frequency, difference by the pulse branch of observation object, and using the synchronous two-way that generates of arbitrary waveform generator
The square wave of phase shift is respectively acting on two electrooptic modulators, so that two electrooptic modulators are respectively per arteries and veins on the way separately
Punching, therefore,, can be at double when high-speed oscilloscope has enough sample rates under the premise of not sacrificing the picture quality of acquisition
Increase system frame speed, when the imaging frame speed requirement of system, can at double reduction high-speed oscilloscope sample rate,
Can also both take compromise, while the sample rate of the imaging frame speed of increase system appropriate and reduction high-speed oscilloscope.When
Using more couplers and using the modulation of identical method, strobe pulse on each sub-path, the imaging system can be made
System obtains higher frame speed, can reduce the sample rate of high-speed oscilloscope to a greater degree.
It should be noted last that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it,
Although being described the invention in detail referring to example, those skilled in the art should understand that, it can be to the present invention
Technical solution be modified or replaced equivalently, without departing from the spirit and scope of the technical solution of the present invention, should all cover
In the scope of the claims of the present invention.
Claims (10)
1. one kind stretches imaging device based on pulse modulated ultrafast time domain characterized by comprising femto-second laser, first
Diffraction grating, focus pack, collection assembly, the second diffraction grating, coupler, the first modulation and time domain stretching assembly, second are adjusted
System and time domain stretching assembly, arbitrary waveform generator, high-speed oscilloscope, computer；
For first diffraction grating between the femto-second laser and the focus pack, observation object is located at the focusing
Between component and the collection assembly, second diffraction grating is described between the collection assembly and the coupler
Coupler be separately connected it is described first modulation and time domain stretching assembly, it is described second modulation and time domain stretching assembly, described first
Modulation and time domain stretching assembly, second modulation and time domain stretching assembly are connect with the high-speed oscilloscope respectively, the height
Fast oscillograph is connect with the computer；
First modulation and time domain stretching assembly include the first electrooptic modulator, the first single mode optical fiber, the first photodetector,
And it is sequentially connected；Second modulation and time domain stretching assembly include the second electrooptic modulator, the second single mode optical fiber, the second photoelectricity
Detector, and be sequentially connected；
The input terminal of the arbitrary waveform generator is connect with the femto-second laser, the output end of the arbitrary waveform generator
It is connect respectively with first electrooptic modulator, second electrooptic modulator.
2. according to claim 1 stretch imaging device based on pulse modulated ultrafast time domain, which is characterized in that described the
One modulation and time domain stretching assembly further include the first erbium-doped fiber amplifier, and second modulation and time domain stretching assembly further include
Second erbium-doped fiber amplifier；First erbium-doped fiber amplifier respectively with the coupler, first electrooptic modulator
Connection, second erbium-doped fiber amplifier are connect with the coupler, second electrooptic modulator respectively.
3. according to claim 1 stretch imaging device based on pulse modulated ultrafast time domain, which is characterized in that further include
First collimator, the second collimator；The first collimator between the femto-second laser and first diffraction grating,
Second collimator is between second diffraction grating and the coupler.
4. according to claim 1 stretch imaging device based on pulse modulated ultrafast time domain, which is characterized in that further include
Low-pass filter；The input terminal of the low-pass filter is connect with the femto-second laser, the output end of the low-pass filter
It is connect with the arbitrary waveform generator.
5. according to claim 1 stretch imaging device based on pulse modulated ultrafast time domain, which is characterized in that described poly-
Burnt component includes the first plano-convex lens, the second plano-convex lens, the first display object lens, first plano-convex lens, described second flat
Convex lens, described first show that the primary optical axis of object lens is parallel or is overlapped；The collection assembly is flat including the second display object lens, third
Convex lens, the 4th plano-convex lens, described second shows the key light of object lens, the third plano-convex lens, the 4th plano-convex lens
Axis is parallel or is overlapped.
6. one kind stretches imaging method based on pulse modulated ultrafast time domain, which comprises the following steps:
Step 1 generates femtosecond pulse by femto-second laser, and is incident on the first diffraction grating；
The femtosecond pulse spatially dispersion is formed the one-dimensional dispersion pulse of line style by step 2, first diffraction grating, and is led to
Over-focusing component focuses on observation object, and the surface information of observation object is encoded to the light of the one-dimensional dispersion pulse of the line style
In spectrum, space encoding pulse is formed；
Step 3 is collected the space encoding pulse by collection assembly, and is incident on the second diffraction grating；
The space encoding pulse is reduced to pulse, and switch-in coupler by step 4, second diffraction grating；
The pulse is divided into the first pulse, the second pulse by step 5, the coupler, and is separately input into the first electric light tune
Device processed, the second electrooptic modulator；The arbitrary waveform generator generates the first square wave letter under the triggering of the femto-second laser
Number, the second square-wave signal, first square-wave signal and second square-wave signal have identical frequency, different phase shifts；It is described
First electrooptic modulator is modulated first pulse according to first square-wave signal, by the first single mode optical fiber to institute
It states the first pulse and carries out time domain stretching, be analog electrical signal by first pulses switch by the first photodetector and transmit
To high-speed oscilloscope；Second electrooptic modulator is modulated second pulse according to second square-wave signal, leads to
It crosses the second single mode optical fiber and time domain stretching is carried out to second pulse, by the second photodetector by second pulses switch
For analog electrical signal and it is transmitted to high-speed oscilloscope；
Analog electrical signal is converted to digital electric signal by step 6, the high-speed oscilloscope, and is transmitted to computer；The calculating
The machine processing digital electric signal obtains image, and stores to described image.
7. according to claim 6 stretch imaging method based on pulse modulated ultrafast time domain, which is characterized in that the step
In rapid 5, before first pulse input to the first electrooptic modulator, by the first EDFA Erbium-Doped Fiber Amplifier to first arteries and veins
Punching amplifies compensation；Before second pulse input to the second electrooptic modulator, pass through the second EDFA Erbium-Doped Fiber Amplifier pair
Second pulse amplifies compensation.
8. according to claim 6 stretch imaging method based on pulse modulated ultrafast time domain, which is characterized in that the step
In rapid 1, the femtosecond pulse is incident on first diffraction grating after first collimator is collimated；In the step 4,
The pulse accesses the coupler after the second collimator is collimated.
9. according to claim 6 stretch imaging method based on pulse modulated ultrafast time domain, which is characterized in that the step
In rapid 5, after the electric signal of the electricity output port output of the femto-second laser carries out low-pass filtering by low-pass filter, as
The trigger signal of the arbitrary waveform generator triggers the arbitrary waveform generator and generates the first square-wave signal, the second square wave
Signal.
10. according to claim 6 stretch imaging method based on pulse modulated ultrafast time domain, which is characterized in that described
In step 2, it is poly- that the one-dimensional dispersion pulse of line style passes sequentially through the first plano-convex lens, the second plano-convex lens, the first microcobjective
Coke is on observation object；
The observation object is placed on one-dimensional motorized precision translation stage, the moving direction of the one-dimensional motorized precision translation stage and the line style
The direction of one-dimensional dispersion pulse is vertical；Or the observation object is placed in microfluidic channel, the flowing side of the microfluid
To vertical with the direction of the one-dimensional dispersion pulse of the line style；
In the step 3, the space encoding pulse passes sequentially through the second microcobjective, third plano-convex lens, Siping City's convex lens
Mirror is incident to second diffraction grating.
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