CN109084906A - A kind of ultrashort pulse measuring device and method - Google Patents
A kind of ultrashort pulse measuring device and method Download PDFInfo
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- CN109084906A CN109084906A CN201810903752.7A CN201810903752A CN109084906A CN 109084906 A CN109084906 A CN 109084906A CN 201810903752 A CN201810903752 A CN 201810903752A CN 109084906 A CN109084906 A CN 109084906A
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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
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Abstract
The present invention is suitable for impulsive measurement technical field, and providing a kind of ultrashort pulse measuring device and method, ultrashort pulse measuring device includes pulse beam splitting module, monochromatic light generation module, phase modulation module and frequency module to be measured and waveform analysis module；It pulse beam splitting module to be measured, monochromatic light generation module, phase modulation module and is sequentially connected with frequency module, pulse beam splitting module to be measured is also connect with frequency module and frequency module is also connect with waveform analysis module.The each measurement that can be avoided ultrashort pulse through the invention, the calibration for requiring to reacquire starting phase angle improve the accuracy and ps Pulse Measurement efficiency for calculating ultrashort pulse time domain waveform to guarantee measurement accuracy.
Description
Technical field
The present invention relates to impulsive measurement technical field more particularly to a kind of ultrashort pulse measuring device and methods.
Background technique
Due to the high light intensity of ultrashort pulse and extremely short pulsewidth, it is widely used in scientific research field and precision adds
Work field.And the progress of Ultrashort pulse technology and the development of pulse width measure technology are undivided, therefore study the ultrashort of measurement
Laser pulse new technology understands pulse width, phase and shape information, is highly important content in ultrafast technical research.Mesh
The common method of preceding measurement laser pulse is correlation method, optical frequency grating switch method (FROG) and self-reference spectrum position phase phase
Dry electric field reconstruction method (SPIDER).
In the method for above-mentioned measurement laser pulse, pulse to be measured need to carry out with the close monochromatic light of two frequencies and
Frequently, however, the two and frequency signal have the time difference when reaching spectrometer, and since the time difference all may in daily use
Slight change can occur, then the time difference of error starting phase angle calculated is had according to this, will lead to reduction impulse phase letter
Second order error is generated when number, to influence the ultrashort pulse time domain waveform of reduction.Therefore, traditional laser pulse measurement method is every
The calibration of reacquisition starting phase angle is required before secondary measurement to guarantee measurement accuracy.
Summary of the invention
It is a primary object of the present invention to propose a kind of ultrashort pulse measuring device and method, to solve to surpass in the prior art
It is ultrashort to reduce calculating to guarantee measurement accuracy for each measurement of short pulse, the calibration for requiring to reacquire starting phase angle
The problem of accuracy and ps Pulse Measurement efficiency of pulse temporal waveform.
To achieve the above object, first aspect of the embodiment of the present invention provides a kind of ultrashort pulse measuring device, including to
Survey pulse beam splitting module, monochromatic light generation module, phase modulation module and frequency module and waveform analysis module；
The pulse beam splitting module to be measured, the monochromatic light generation module, the phase modulation module and described and frequency mould
Block is sequentially connected, and the pulse beam splitting module to be measured is also connect with described and frequency module, described and frequency module also with the waveform
Analysis module connection；
Pulse to be measured is divided into the first pulse signal and the second pulse signal by the pulse beam splitting module to be measured, and described first
Pulse signal is sent to described and frequency module, second pulse signal and is sent to monochromatic light generation module；
The monochromatic light generation module generates the first monochromatic optical signal and the second monochromatic light according to second pulse signal
Signal；
The phase modulation module carries out phase-modulation to the described first monochromatic optical signal and the second monochromatic optical signal,
Obtain the first monochromatic optical signal and the second monochromatic optical signal under out of phase modulation；
Described and frequency module is according to the first monochromatic optical signal under first pulse signal and out of phase modulation
Multiple interference fringes are generated with the second monochromatic optical signal；
The waveform analysis module is calculated according to the multiple interference fringe obtains ultrashort pulse time domain waveform, described in reduction
The spectrum phase of pulse signal to be measured.
Optionally, the pulse beam splitting module to be measured includes delay cell and beam splitter；
The delay cell is connect with the beam splitter；
The beam splitter sends first pulse signal to the delay cell, and sends to the phase modulation module
Second pulse signal, and the first pulse signal is sent to described and frequency module；
The delay units delay, the beam splitter send the time of first pulse signal to described and frequency module.
Optionally, a kind of implementation of the monochromatic light generation module includes reflector element and the first pulses switch list
Member；
The reflector element is connected with the first pulses switch unit；
The reflector element accesses second pulse signal, and reflects first pulse signal；
Second pulse signal is converted to two circular polarization chirped pulse signals by the first pulses switch unit, and
According to the monochromatic optical signal of described two circular polarization chirped pulse signals output described first and the second monochromatic optical signal.
Optionally, the reflector element includes reflecting mirror；
The first pulses switch unit includes high dispersive medium, uniaxial crystal and quarter-wave plate.
Optionally, another implementation of the monochromatic light generation module includes raster unit, the second pulses switch list
Member；
The raster unit is connected with the second pulses switch unit；
The raster unit accesses second pulse signal, and reflects first pulse signal, and according to described the
Two output of pulse signal angle dispersion pulse signals；
The angle dispersion pulse signal is converted to two circular polarization angle dispersion pulse letters by the second pulses switch unit
Number, and the first monochromatic optical signal and second monochromatic light letter according to described two circular polarization angle dispersion output of pulse signal
Number.
Optionally, the raster unit includes reflecting grating；
The second pulses switch unit includes Wollaston prism and quarter-wave plate.
Optionally, the phase modulation module includes phase modulation unit and Polarization Modulation unit；
The phase modulation unit is connected with the Polarization Modulation unit；
The phase modulation unit changes the initial phase of the described first monochromatic optical signal and the second monochromatic optical signal；
The Polarization Modulation unit changes the polarization direction of the described first monochromatic optical signal and the second monochromatic optical signal.
Optionally, the phase modulation unit includes electronically controlled rotary table, and the Polarization Modulation unit includes polarizer；
The electronically controlled rotary table is connected with the polarizer；
Equipped with half-wave plate in the electronically controlled rotary table, the rotation angle of the half-wave plate is corresponding with the initial phase.
Optionally, described and frequency module include focus reflector element and with frequency unit；
The focusing reflector element is connected with described with frequency unit；
The focusing reflector element receives the first monochromatic light under first pulse signal and out of phase modulation
Signal and the second monochromatic optical signal, and focus and reflex to described and frequency unit；
Described and frequency unit generates the multiple interference fringe according to the focusing reflected light for focusing reflector element.
Optionally, the focusing reflector element includes concave mirror, and described and frequency unit includes and frequency crystal.
Optionally, the waveform analysis module includes shearing phase acquiring unit, spectroscopy unit and waveshape list
Member；
The shearing phase acquiring unit, the spectroscopy unit and the waveshape unit are sequentially connected；
The shearing phase acquiring unit establishes interference fringe Two dimensional Distribution according to the multiple interference fringe, and to described
Two dimensional Distribution carries out Fourier transformation, extracts exchange item, obtains shearing phase；
The spectroscopy unit is according to the first monochromatic light under first pulse signal and out of phase modulation
Spatial distribution after signal and the second monochromatic optical signal and frequency, obtains the phase function of first pulse signal；
The waveshape unit calculates the pulse signal to be measured according to the phase function of first pulse signal
Ultrashort pulse time domain waveform restores the spectrum phase of the pulse signal to be measured.
Second aspect of the embodiment of the present invention provides a kind of ps Pulse Measurement method, applied to above-mentioned ps Pulse Measurement
Device, the ps Pulse Measurement method include:
Pulse to be measured is divided into the first pulse signal and the second pulse signal；
The first monochromatic optical signal and the second monochromatic optical signal are generated according to second pulse signal；
Phase-modulation is carried out to the described first monochromatic optical signal and the second monochromatic optical signal, obtains out of phase modulation
Under the first monochromatic optical signal and the second monochromatic optical signal；
According to the first monochromatic optical signal and the second monochromatic light under first pulse signal and out of phase modulation
Signal generates multiple interference fringes；
It is calculated according to the multiple interference fringe and obtains ultrashort pulse time domain waveform, restore the light of the pulse signal to be measured
Compose phase.
The ultrashort pulse measuring device and method that the embodiment of the present invention is proposed, will be to be measured by pulse beam splitting module to be measured
Pulse is divided into the first pulse signal for measuring original pulse signal to be measured, and second for generating two monochromatic optical signals
Then pulsed measuring signals carry out phase tune to the first monochromatic optical signal and the second monochromatic optical signal by phase modulation module
System, so that the first monochromatic optical signal and the second monochromatic optical signal and the arrival of the first pulse signal and frequency mould under out of phase modulation
The time difference of block is 0, therefore does not need the calibration for reacquiring starting phase angle before each measurement, avoid two beams reach and
The time difference of the ultrashort pulse of frequency module, caused by generated error when calculating ultrashort pulse time domain waveform, to improve
The accuracy and ps Pulse Measurement efficiency of reduction pulse signal spectrum phase to be measured.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the ultrashort pulse measuring device that the embodiment of the present invention one provides；
Fig. 2 is the structural schematic diagram of ultrashort pulse measuring device provided by Embodiment 2 of the present invention；
Fig. 3 is the structural schematic diagram for the ultrashort pulse measuring device that the embodiment of the present invention three provides；
Fig. 4 is the structural schematic diagram for the ultrashort pulse measuring device that the embodiment of the present invention four provides；
Fig. 5 is the structural schematic diagram for the ultrashort pulse measuring device that the embodiment of the present invention five provides；
Fig. 6 is the structural schematic diagram for the ultrashort pulse measuring device that the embodiment of the present invention six provides；
Fig. 7 is the structural schematic diagram for the ultrashort pulse measuring device that the embodiment of the present invention seven provides；
Fig. 8 is the implementation process schematic diagram for the ps Pulse Measurement method that the embodiment of the present invention eight provides.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or device.
Herein, using the suffix for indicating such as " module ", " component " or " unit " of element only for advantageous
In explanation of the invention, there is no specific meanings for itself.Therefore, " module " can be used mixedly with " component ".
In subsequent description, inventive embodiments serial number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
Embodiment one
As shown in Figure 1, the embodiment of the invention provides a kind of ultrashort pulse measuring device 100, including pulse beam splitting to be measured
Module 10, monochromatic light generation module 20, phase modulation module 30 and frequency module 40 and waveform analysis module 50.
In embodiments of the present invention, the connection relationship of above-mentioned module is as follows:
Pulse beam splitting module 10 to be measured, monochromatic light generation module 20, phase modulation module 30 and successively connect with frequency module 40
Connect, the second pulse signal by monochromatic light generation module 20, phase modulation module 30 processing after, output to and frequency module 40；To
It surveys pulse beam splitting module 10 also to connect with frequency module 40, the first pulse signal is as pulse signal measured directly is carried out, directly
Connect output to and frequency module 40；With frequency module 40 also connect with waveform analysis module 50 and frequency module 40 output and frequency after arteries and veins
It rushes signal to waveform analysis module 50 and carries out waveform analysis.
In embodiments of the present invention, pulse beam splitting module 10 to be measured, for by pulse to be measured be divided into the first pulse signal and
Second pulse signal, wherein the first pulse signal and the second pulse signal have frequency identical with pulse signal to be measured, period
And amplitude etc., the direction of propagation is different, and the first pulse signal is sent to and frequency module, and the second pulse signal is sent to list
Coloured light generation module.
In a particular application, pulse beam splitting module to be measured can be that arbitrarily single beam pulse signal can be divided into two bundles arteries and veins
The optical electron device or optical electron combination of devices for rushing signal and exporting respectively, such as grating is to, birefringece crystal and beam splitting
Device etc..
In embodiments of the present invention, monochromatic light generation module 20, for generating the first monochromatic light according to the second pulse signal
Signal and the second monochromatic optical signal.
In practical applications, a branch of natural light optical signal can be divided into countless monochromatic optical signals, the monochromatic light separated
Signal will have optical frequency difference；The second pulse signal is divided into the first monochromatic optical signal and the second list in the embodiment of the present invention
Coloured light signal, then the first monochromatic optical signal and the second monochromatic optical signal have difference on the frequency, so that can in phase modulation module
By the first monochromatic optical signal and the second monochromatic optical signal modulation at the two monochromic beam signals with mutually different phase.
In a particular application, monochromatic light generation module can be believed for pulse signal can be arbitrarily decomposed into two monochromic beams
Number optical electron device or optical electron combination of devices, such as the combination of high dispersive medium and uniaxial crystal.
In embodiments of the present invention, phase modulation module 30, for the first monochromatic optical signal and the second monochromatic optical signal
Phase-modulation is carried out, that is, changes the first monochromatic light and the second monochromatic phase, to obtain the first list under out of phase modulation
Coloured light signal and the second monochromatic optical signal.
In practical applications, the first monochromatic optical signal under out of phase modulation and the second monochromatic optical signal refer to: multiple groups phase
Potential difference different the first monochromatic optical signal and the second monochromatic optical signal；Such as the first monochromatic light letter under three groups of out of phase modulation
Number and the second monochromatic optical signal show themselves in that phase difference isThe first monochromatic optical signal and the second monochromatic optical signal, phase difference beThe first monochromatic optical signal and the second monochromatic optical signal, phase difference beThe first monochromatic optical signal and the second monochromatic light letter
Number.
In a particular application, phase modulation module can be the optical electron that can arbitrarily adjust monochromatic optical signal phase
Device or optical electron combination of devices, such as phase-modulator or phase-shift circuit.
In embodiments of the present invention with frequency module 40, for according to the under the first pulse signal and out of phase modulation
One monochromatic optical signal and the second monochromatic optical signal generate multiple interference fringes.
In practical applications, on the one hand, interference fringe is produced as the first pulse signal, the first monochromatic optical signal and second
The superposition of monochromatic optical signal, and since phase modulation module can change the first monochromatic light and the second monochromatic phase,
According to the first lower monochromatic optical signal of out of phase modulation and second monochrome optical signal multiple interference fringes generated not phase
Together；On the other hand, and the observation of interference fringe and analysis need optic analytical instrument to assist.
It in a particular application can be the optical electron that arbitrarily multiple optical signals can be integrated, interfered with frequency module
Device or optical electron combination of devices, such as the combination with frequency crystal and concentrating device.
In embodiments of the present invention, waveform analysis module calculates according to multiple interference fringes and obtains ultrashort pulse time domain wave
Shape, and restore the spectrum phase of pulse signal to be measured.
In practical applications, the analysis of interference fringe and calculating are needed based on optic analytical instrument, to pulse to be measured
The measurement of signal is to measure its pulsewidth, amplitude, phase, space-time distortion etc..The present embodiment is according to ultrashort pulse time domain waveform, energy
It enough obtains the pulsewidth of pulse signal to be measured, amplitude, phase etc., and restores the spectrum phase of pulse signal to be measured.
In a particular application, waveform analysis module can be the optics that observation analysis can be arbitrarily carried out to interference fringe
Electronic device or optical electron combination of devices, such as spectrometer.
The working principle of ultrashort pulse measuring device provided by the embodiment of the present invention is as follows:
After pulse signal to be measured is by pulse beam splitting module to be measured, it is divided into the first pulse signal as measurement, and be used as
Monochromatic second pulse signal is produced, because of the first pulse signal in ps Pulse Measurement, as pulse signal to be measured
Need the monochromatic light progress and frequency close with two frequencies.First pulse signal can be described as A (ω in spectral domain1-ωs)exp
(iΦ(ω1-ωs)), wherein A represents spectral amplitudes,Spectrum phase is represented, ω 1 is spectrum angular frequency, ωsFor measured signal
Centre frequency.Assuming that the close monochromatic frequency of the two frequencies is respectively ωcAnd ωc+ Ω, wherein Ω is two monochromes
The difference on the frequency of light.So, in frequency module, the first monochromatic optical signal and the second monochromatic optical signal carry out and become frequently: A
(ω1-(ωs+ωc))exp(iΦ(ω1-(ωs+ωc))) and A (ω1-(ωs+ωc+Ω))exp(iΦ(ω1-(ωs+ωc+
Ω))).Enable ω=ω1-(ωs+ωc), available above-mentioned two and frequency light can be expressed as in frequency domain, A (ω) exp
(i Φ (ω)) and A (ω-Ω) exp (i Φ (ω-Ω)).If the two and frequency signal have time difference τ, the first monochromatic light
Signal and the second monochromatic optical signal pass through and the interference fringe of frequency module generation can indicate are as follows: A2(ω)+A2(ω-Ω)+2A
(ω)A(ω-Ω)cos(Φ(ω-Ω)-Φ(ω)-ωτ).By being extracted after carrying out Fourier transformation to interference fringe data
Exchange item obtains 2A (ω) A (ω-Ω) cos (Φ (ω-Ω)-Φ (ω)-ω τ), and extracts phase and obtain Φ (ω-Ω)-Φ
(ω)-ωτ.At this point, enabling ω τ is 0, that is, by phase modulation module, the phase shift of interference fringe is introduced, to demodulate
Shearing phase outUltrashort pulse time domain waveform is calculated by waveform analysis module again, and restores spectrum phase
Position
Ultrashort pulse measuring device provided by the embodiment of the present invention is divided pulse to be measured by pulse beam splitting module to be measured
For the first pulse signal for measuring original pulse signal to be measured, and the second pulse survey for generating two monochromatic optical signals
Signal is measured, phase-modulation is then carried out to the first monochromatic optical signal and the second monochromatic optical signal by phase modulation module, so that
The first lower monochromatic optical signal of out of phase modulation and the second monochromatic optical signal and the arrival of the first pulse signal and frequency module when
Between difference be 0, therefore do not need the calibration for reacquiring starting phase angle before each measurement, avoid two beams and reach and frequency module
Ultrashort pulse time difference, caused by generated error when calculating ultrashort pulse time domain waveform, to improve reduction
The accuracy and ps Pulse Measurement efficiency of pulse signal spectrum phase to be measured.
Embodiment two
As shown in Fig. 2, the embodiment of the present invention illustratively proposes in a kind of above-described embodiment one, pulse beam splitting mould to be measured
The structure of block 10 comprising delay cell 11 and beam splitter 12, wherein delay cell 11 is connect with beam splitter 12.
In embodiments of the present invention, beam splitter 12, for sending the first pulse signal to delay cell, and to phase-modulation
Module sends the second pulse signal, and sends the first pulse signal to frequency module, i.e. pulse signal to be measured is divided by beam splitter
The direction of propagation different the first pulse signal and the second pulse signal；Delay cell 11, for postponing, beam splitter to and frequency module
The time of the first pulse signal is sent, so as to adjust the phase of the first pulse signal, makes the first pulse signal and output extremely and frequency
The monochromatic optical signal of the first of module and the second monochromatic optical signal, have fixed phase relationship, meet interference condition.
In a particular application, beam splitter can be first device that light beam can be arbitrarily divided into two-beam or multi-beam
Part；Delay cell can be the component that arbitrarily can export for a period of time signal delay.
In one embodiment, delay cell includes optical delay line.
Embodiment three
As shown in figure 3, the embodiment of the present invention illustratively proposes in a kind of above-described embodiment one, monochromatic light generation module
20 a kind of structure comprising reflector element 21 and the first pulses switch unit 22, wherein reflector element 21 and the first pulse turn
Change the connection of unit 22.
In embodiments of the present invention, reflector element 21 is for accessing the second pulse signal, and reflects the first pulse signal, resistance
Only the first output of pulse signal is into the first pulses switch unit；First pulses switch unit 22 is used for the second pulse signal
Be converted to two circular polarization chirped pulse signals, and according to two monochromatic optical signals of circular polarization chirped pulse signals output first and
Second monochromatic optical signal, due to introducing chirped pulse signal, export at this time to and frequency module the first monochrome optical signal and second
The parameter of monochromatic optical signal is amplified.
In one embodiment, reflector element includes reflecting mirror；First pulses switch unit includes high dispersive medium, single shaft
Crystal and quarter-wave plate.
The working principle of monochromatic light generation module provided in an embodiment of the present invention is as follows:
Pulse signal to be measured is divided into two beams by pulse beam splitting module to be measured, the first pulse of the reflection exported from beam splitter
Signal road is as pulse signal to be measured, and the second pulse signal is for generating two quasi-monochromatic lights for having difference on the frequency.Monochromatic photoproduction
At in module, the second pulse signal becomes chirped pulse signal after first passing through reflecting mirror and dispersive medium, then by uniaxial brilliant
Body becomes two orthogonal chirped pulse signals of polarization of time escaping, then by crystal quarter-wave plate, by this
Two orthogonal chirped pulse signals of polarization become circular polarization, and the direction of rotation of circular polarization is opposite.Since chirped pulse is believed
Number some moment therefore a corresponding optical frequency with the first pulse signal when with meeting on frequency crystal, can be used as list
Coloured light, i.e., the first monochromatic optical signal and the second monochromatic optical signal.Due to having the time difference between the two chirped pulse signals, because
This is with pulse signal to be measured, the first monochromatic optical signal and the second monochromatic optical signal have difference on the frequency when with meeting on frequency crystal.
Example IV
As shown in figure 4, the embodiment of the present invention illustratively proposes in a kind of above-described embodiment one, monochromatic light generation module
20 another structure comprising raster unit 23, the second pulses switch unit 24；Wherein, raster unit 23 and the second pulse
Converting unit 24 connects.
In embodiments of the present invention, the first pulse signal for accessing the second pulse signal, and is reflected in raster unit 23,
And according to the second output of pulse signal angle dispersion pulse signal；Second pulses switch unit 24 is used for angle dispersion pulse signal
Two circular polarization angle dispersion pulse signals are converted to, and are believed according to two circular polarization angle dispersion the first monochromatic light of output of pulse signal
Number and the second monochromatic optical signal, due to the corresponding optical frequency in some direction of angle dispersion pulse, above-mentioned two circle is inclined
Shake angle dispersion pulse signal with the first pulse signal when with meeting on frequency crystal, can be as monochromatic light.
In one embodiment, raster unit includes reflecting grating；Second pulses switch unit includes Wollaston prism
And quarter-wave plate.
The working principle of monochromatic light generation module provided in an embodiment of the present invention is as follows:
Pulse signal to be measured is divided into two beams by pulse beam splitting module to be measured, the first pulse of the reflection exported from beam splitter
Signal road is as pulse signal to be measured, and the second pulse signal signal is for generating two quasi-monochromatic lights for having difference on the frequency.
In monochromatic light generation module, the second pulse signal becomes angle dispersion pulse signal (i.e. different optical frequencies after reflecting grating
Light can be along different directions), then become two orthogonal angles of polarization of direction escaping by a Wollaston prism
The two are polarized orthogonal angle dispersion pulse signal and become by dispersion pulse signal then by crystal quarter-wave plate
Direction of rotation for circular polarization, circular polarization is opposite.Due to dispersion pulse signal be focused into on frequency crystal, then with frequency crystal
Different spaces on, the ingredient of the different optical frequencies of corresponding dispersion pulse signal, and since the second pulse signal is also poly-
Coke is a bit, angle dispersion pulse signal can be as monochromatic light, i.e., the first monochromatic optical signal and the second monochromatic optical signal at this time.Separately
Outside, due to having direction difference between two angle dispersion pulse signals, thus the first monochromatic optical signal and the second monochromatic optical signal with
For first pulse signal when with meeting on frequency crystal, the first monochromatic optical signal and the second monochromatic optical signal have difference on the frequency.
Embodiment five
As shown in figure 5, the embodiment of the present invention illustratively proposes in a kind of above-described embodiment one, phase modulation module 30
A kind of structure comprising phase modulation unit 31 and Polarization Modulation unit 32；Wherein, phase modulation unit 31 and Polarization Modulation
Unit 32 connects.
In embodiments of the present invention, phase modulation unit 31, for changing the first monochromatic optical signal and the second monochromatic light letter
Number initial phase；Polarization Modulation unit 32, for changing the polarization direction of the first monochromatic optical signal and the second monochromatic optical signal.
In one embodiment, phase modulation unit includes electronically controlled rotary table, and Polarization Modulation unit includes polarizer；Its
In, electronically controlled rotary table is connected with polarizer；Equipped with half-wave plate, the rotation angle and initial phase of half-wave plate in electronically controlled rotary table
It is corresponding, that is, when changing the rotation angle of half-wave revolving fragment, to the phase-modulation of the first monochromatic optical signal and the second monochromatic optical signal
It is corresponding to change.
The working principle of phase modulation module provided in an embodiment of the present invention is as follows:
In phase modulation module, electronically controlled rotary table carries a half-wave plate, (wherein a branch of to be to two monochromatic circularly polarized lights
Left-hand polarization, another beam are dextropolarization, and the optical frequency of two-beam has minute differences) phase-modulation is carried out, then pass through one
A polarizer.Assuming that half-wave plate rotation angle is θ, then the phase-modulation that wherein a monochromic beam introduces is 2 θ, another Shu Dan
Coloured light is then -2 θ.
Embodiment six
As shown in fig. 6, the embodiment of the present invention illustratively propose in a kind of above-described embodiment one and frequency module 40 one
Kind of structure comprising focus reflector element 41 and with frequency unit 42；Wherein, it focuses reflector element 41 and is connected with frequency unit 42.
In embodiments of the present invention, reflector element 41 is focused, for receiving under the first pulse signal and out of phase modulation
The first monochromatic optical signal and the second monochromatic optical signal, and focus and reflex to and frequency unit；With frequency unit 42, it is used for according to focusing
The focusing reflected light of reflector element generates multiple interference fringes.
In one embodiment, focusing reflector element includes concave mirror and frequency unit includes and frequency crystal.
Embodiment seven
As shown in fig. 7, the embodiment of the present invention illustratively proposes in a kind of above-described embodiment one, waveform analysis module 50
A kind of structure comprising shearing phase acquiring unit 51, spectroscopy unit 52 and waveshape unit 53；Wherein, it shears
Phase acquiring unit 51, spectroscopy unit 52 and waveshape unit 53 are sequentially connected.
In embodiments of the present invention, interference fringe is established according to multiple interference fringes for acquiring unit in shearing phase 51
Two dimensional Distribution, and Fourier transformation is carried out to Two dimensional Distribution, exchange item is extracted, shearing phase is obtained；Spectroscopy unit 52 is used
According to the light after the first monochromatic optical signal and the second monochromatic optical signal and frequency under the first pulse signal and out of phase modulation
Spectral structure obtains the phase function of the first pulse signal；Waveshape unit 53, for the phase letter according to the first pulse signal
Number, calculates the ultrashort pulse time domain waveform of pulse signal to be measured, and restore the spectrum phase of pulse signal to be measured.
The working principle of waveform analysis module provided in an embodiment of the present invention is as follows:
It carries out with the first pulse signal in frequency module and the first monochromatic optical signal and the second monochromatic optical signal and frequently, generates
Interference fringe be A2(ω)+A2(ω-Ω)+2A (ω) A (ω-Ω) cos (Φ (ω-Ω)-Φ (ω) -4 θ) obtains different turn
The available Two dimensional Distribution of multiple interference fringes under angle carries out Fourier transformation along angle direction, after extracting exchange item,
Shearing phase Φ (ω-Ω)-Φ (ω) can be calculated, it is then assumed that phase is 0, i.e. Φ (0)=0, at this moment, root at center
According to known shearing phase Φ (ω-Ω)-Φ (ω), Φ (ω) is calculated to both ends.According to spectrometer measurement light to be measured
The available A of spatial distribution2(ω), then inverse Fourier transform is carried out to A (ω) exp (i Φ (ω)) and can be obtained by ultrashort arteries and veins
Time domain waveform is rushed, finally according to ultrashort pulse time domain waveform, restores the spectrum phase of the pulse signal to be measured.
Embodiment eight
As shown in figure 8, the embodiment of the present invention proposes a kind of ps Pulse Measurement method, it is applied to such as above-described embodiment institute
The ultrashort pulse measuring device of offer, ps Pulse Measurement method include:
S801, pulse to be measured is divided into the first pulse signal and the second pulse signal.
S802, the first monochromatic optical signal and the second monochromatic optical signal are generated according to second pulse signal.
S803, phase-modulation is carried out to the described first monochromatic optical signal and the second monochromatic optical signal, obtains different phases
The first monochromatic optical signal and the second monochromatic optical signal under the modulation of position.
S804, according to lower the first monochromatic optical signal and second of first pulse signal and out of phase modulation singly
Coloured light signal generates multiple interference fringes.
S805, acquisition ultrashort pulse time domain waveform is calculated according to the multiple interference fringe, restore the pulse letter to be measured
Number spectrum phase.
The ps Pulse Measurement method that the embodiment of the present invention is proposed, by pulse to be measured is divided into be used to measure it is original to
The first pulse signal of pulse signal, and the second pulsed measuring signals for generating two monochromatic optical signals are surveyed, are then passed through
Phase-modulation is carried out to the first monochromatic optical signal and the second monochromatic optical signal, so that the first monochromatic light letter under out of phase modulation
Number and the second monochromatic optical signal and the first pulse signal reaches and the time difference of frequency module is 0, therefore do not need measuring every time
The preceding calibration for reacquiring starting phase angle avoids the first monochromatic optical signal and the second monochromatic optical signal and the first pulse signal
Reach and the time difference of frequency module, caused by generated error when calculating ultrashort pulse time domain waveform, to improve light
Compose the accuracy and ps Pulse Measurement efficiency of phase.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although previous embodiment
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all include
Within protection scope of the present invention.
Claims (12)
1. a kind of ultrashort pulse measuring device, which is characterized in that including pulse beam splitting module to be measured, monochromatic light generation module, phase
Position modulation module and frequency module and waveform analysis module；
The pulse beam splitting module to be measured, the monochromatic light generation module, the phase modulation module and described and frequency module according to
Secondary connection, the pulse beam splitting module to be measured are also connect with described and frequency module, described and frequency module also with the waveform analysis
Module connection；
Pulse to be measured is divided into the first pulse signal and the second pulse signal, first pulse by the pulse beam splitting module to be measured
Signal is sent to described and frequency module, second pulse signal and is sent to monochromatic light generation module；
The monochromatic light generation module generates the first monochromatic optical signal and the second monochromatic optical signal according to second pulse signal；
The phase modulation module carries out phase-modulation to the described first monochromatic optical signal and the second monochromatic optical signal, obtains
The first monochromatic optical signal and the second monochromatic optical signal under out of phase modulation；
Described and frequency module is according to the first lower monochrome optical signal of first pulse signal and out of phase modulation and the
Two monochromatic optical signals generate multiple interference fringes；
The waveform analysis module calculates according to the multiple interference fringe and obtains ultrashort pulse time domain waveform, restores described to be measured
The spectrum phase of pulse signal.
2. ultrashort pulse measuring device as described in claim 1, which is characterized in that the pulse beam splitting module to be measured includes prolonging
Slow unit and beam splitter；
The delay cell is connect with the beam splitter；
The beam splitter sends first pulse signal to the delay cell, and described in sending to the phase modulation module
Second pulse signal, and the first pulse signal is sent to described and frequency module；
The delay units delay, the beam splitter send the time of first pulse signal to described and frequency module.
3. ultrashort pulse measuring device as described in claim 1, which is characterized in that a kind of reality of the monochromatic light generation module
Existing mode includes reflector element and the first pulses switch unit；
The reflector element is connected with the first pulses switch unit；
The reflector element accesses second pulse signal, and reflects first pulse signal；
Second pulse signal is converted to two circular polarization chirped pulse signals by the first pulses switch unit, and according to
The monochromatic optical signal of described two circular polarization chirped pulse signal outputs described first and the second monochromatic optical signal.
4. ultrashort pulse measuring device as claimed in claim 3, which is characterized in that the reflector element includes reflecting mirror；
The first pulses switch unit includes high dispersive medium, uniaxial crystal and quarter-wave plate.
5. ultrashort pulse measuring device as described in claim 1, which is characterized in that the another kind of the monochromatic light generation module
Implementation includes raster unit, the second pulses switch unit；
The raster unit is connected with the second pulses switch unit；
The raster unit accesses second pulse signal, and reflects first pulse signal, and according to second arteries and veins
Rush signal output angle dispersion pulse signal；
The angle dispersion pulse signal is converted to two circular polarization angle dispersion pulse signals by the second pulses switch unit, and
The first monochromatic optical signal according to described two circular polarization angle dispersion output of pulse signal and the second monochromatic optical signal.
6. ultrashort pulse measuring device as claimed in claim 5, which is characterized in that the raster unit includes reflecting grating；
The second pulses switch unit includes Wollaston prism and quarter-wave plate.
7. ultrashort pulse measuring device as described in claim 1, which is characterized in that the phase modulation module includes phase tune
Unit processed and Polarization Modulation unit；
The phase modulation unit is connected with the Polarization Modulation unit；
The phase modulation unit changes the initial phase of the described first monochromatic optical signal and the second monochromatic optical signal；
The Polarization Modulation unit changes the polarization direction of the described first monochromatic optical signal and the second monochromatic optical signal.
8. ultrashort pulse measuring device as claimed in claim 7, which is characterized in that the phase modulation unit includes automatically controlled rotation
Turntable, the Polarization Modulation unit includes polarizer；
The electronically controlled rotary table is connected with the polarizer；
Equipped with half-wave plate in the electronically controlled rotary table, the rotation angle of the half-wave plate is corresponding with the initial phase.
9. ultrashort pulse measuring device as described in claim 1, which is characterized in that described and frequency module includes focusing reflection list
Member and with frequency unit；
The focusing reflector element is connected with described with frequency unit；
The focusing reflector element receives the first monochromatic optical signal under first pulse signal and out of phase modulation
With the second monochromatic optical signal, and focuses and reflex to described and frequency unit；
Described and frequency unit generates the multiple interference fringe according to the focusing reflected light for focusing reflector element.
10. ultrashort pulse measuring device as claimed in claim 9, which is characterized in that the focusing reflector element includes concave surface
Mirror, described and frequency unit include and frequency crystal.
11. ultrashort pulse measuring device as described in claim 1, which is characterized in that the waveform analysis module includes shearing
Phase acquiring unit, spectroscopy unit and waveshape unit；
The shearing phase acquiring unit, the spectroscopy unit and the waveshape unit are sequentially connected；
The shearing phase acquiring unit establishes interference fringe Two dimensional Distribution according to the multiple interference fringe, and to the two dimension
Distribution carries out Fourier transformation, extracts exchange item, obtains shearing phase；
The spectroscopy unit is according to the first monochromatic optical signal under first pulse signal and out of phase modulation
Spatial distribution with after the second monochromatic optical signal and frequency, obtains the phase function of first pulse signal；
The waveshape unit calculates the ultrashort of the pulse signal to be measured according to the phase function of first pulse signal
Pulse temporal waveform restores the spectrum phase of the pulse signal to be measured.
12. a kind of ps Pulse Measurement method, which is characterized in that be applied to as described in any one of claim 1 to 11 ultrashort
Impulsive measurement device, the ps Pulse Measurement method include:
Pulse to be measured is divided into the first pulse signal and the second pulse signal；
The first monochromatic optical signal and the second monochromatic optical signal are generated according to second pulse signal；
Phase-modulation is carried out to the described first monochromatic optical signal and the second monochromatic optical signal, is obtained under out of phase modulation
First monochromatic optical signal and the second monochromatic optical signal；
According to the first monochromatic optical signal and the second monochromatic optical signal under first pulse signal and out of phase modulation
Generate multiple interference fringes；
It is calculated according to the multiple interference fringe and obtains ultrashort pulse time domain waveform, restore the spectrum phase of the pulse signal to be measured
Position.
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| CN111412986A (en) * | 2019-01-07 | 2020-07-14 | 中国移动通信有限公司研究院 | Optical signal waveform detection device and method |
| CN111416659A (en) * | 2019-01-07 | 2020-07-14 | 中国移动通信有限公司研究院 | Optical signal time domain waveform measuring method, device, electronic equipment and medium |
| WO2021203499A1 (en) * | 2020-04-09 | 2021-10-14 | 华南理工大学 | Light pulse signal processing system |
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