CN208537036U - A kind of ultrashort pulse measuring device - Google Patents
A kind of ultrashort pulse measuring device Download PDFInfo
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- CN208537036U CN208537036U CN201821283084.4U CN201821283084U CN208537036U CN 208537036 U CN208537036 U CN 208537036U CN 201821283084 U CN201821283084 U CN 201821283084U CN 208537036 U CN208537036 U CN 208537036U
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Abstract
The utility model is suitable for impulsive measurement technical field, provides a kind of ultrashort pulse measuring device, 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 by the utility model, 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 utility model relates to impulsive measurement technical field more particularly to a kind of ultrashort pulse measuring devices.
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.
Utility model content
The main purpose of the utility model is that propose a kind of ultrashort pulse measuring device, it is ultrashort in the prior art to solve
Each measurement of pulse, the calibration for requiring to reacquire starting phase angle reduce to guarantee measurement accuracy and calculate ultrashort arteries and veins
The problem of rushing the accuracy and ps Pulse Measurement efficiency of time domain waveform.
To achieve the above object, the utility model embodiment first aspect provides a kind of ultrashort pulse measuring device, packet
Include pulse beam splitting module, monochromatic light generation module, phase modulation module and frequency module to be measured 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.
The ultrashort pulse measuring device that the utility model embodiment is proposed, by pulse beam splitting module to be measured by arteries and veins to be measured
Punching is divided into the first pulse signal for measuring original pulse signal to be measured, and the second arteries and veins for generating two monochromatic optical signals
Measuring signal is rushed, 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 monochromatic optical signal and the second monochromatic optical signal and the arrival of the first pulse signal and frequency module under out of phase modulation
Time difference be 0, therefore do not need the calibration for reacquiring starting phase angle before each measurement, avoid two beams and reach and frequency
The time difference of the ultrashort pulse of module, caused by generated error when calculating ultrashort pulse time domain waveform, to improve
Restore the accuracy and ps Pulse Measurement efficiency of 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 utility model embodiment one provides；
Fig. 2 is the structural schematic diagram for the ultrashort pulse measuring device that the utility model embodiment two provides；
Fig. 3 is the structural schematic diagram for the ultrashort pulse measuring device that the utility model embodiment three provides；
Fig. 4 is the structural schematic diagram for the ultrashort pulse measuring device that the utility model embodiment four provides；
Fig. 5 is the structural schematic diagram for the ultrashort pulse measuring device that the utility model embodiment five provides；
Fig. 6 is the structural schematic diagram for the ultrashort pulse measuring device that the utility model embodiment six provides；
Fig. 7 is the structural schematic diagram for the ultrashort pulse measuring device that the utility model embodiment seven provides.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
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 the explanation of the utility model, there is no specific meanings for itself.Therefore, " module " can be used mixedly with " component ".
In subsequent description, utility model embodiment sequence number is for illustration only, does not represent the advantages or disadvantages of the embodiments.
Embodiment one
As shown in Figure 1, the utility model embodiment provides a kind of ultrashort pulse measuring device 100, including pulse to be measured
Beam splitting module 10, monochromatic light generation module 20, phase modulation module 30 and frequency module 40 and waveform analysis module 50.
In the utility model embodiment, 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 the utility model embodiment, pulse beam splitting module 10 to be measured, for pulse to be measured to be divided into the first pulse letter
Number and the 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 monochromatic 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 the utility model embodiment, monochromatic light generation module 20 is single for generating first according to the second pulse signal
Coloured light 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 in the utility model embodiment
Two monochromatic optical signals, then the first monochromatic optical signal and the second monochromatic optical signal have difference on the frequency, so that in phase modulation module
It can be by the first monochromatic optical signal and the second monochromatic optical signal modulation at two monochromic beams with mutually different phase are believed
Number.
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 the utility model embodiment, phase modulation module 30, for the first monochromatic optical signal and the second monochromatic light
Signal carries out phase-modulation, that is, changes the first monochromatic light and the second monochromatic phase, to obtain the under out of phase modulation
One monochromatic optical 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 the utility model embodiment and frequency module 40, for according under the first pulse signal and out of phase modulation
The first 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 the utility model embodiment, waveform analysis module calculates according to multiple interference fringes and obtains ultrashort pulse time domain
Waveform, 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 utility model embodiment 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 utility model embodiment, by pulse beam splitting module to be measured by arteries and veins to be measured
Punching is divided into the first pulse signal for measuring original pulse signal to be measured, and the second arteries and veins for generating two monochromatic optical signals
Measuring signal is rushed, 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 monochromatic optical signal and the second monochromatic optical signal and the arrival of the first pulse signal and frequency module under out of phase modulation
Time difference be 0, therefore do not need the calibration for reacquiring starting phase angle before each measurement, avoid two beams and reach and frequency
The time difference of the ultrashort pulse of module, caused by generated error when calculating ultrashort pulse time domain waveform, to improve
Restore the accuracy and ps Pulse Measurement efficiency of pulse signal spectrum phase to be measured.
Embodiment two
As shown in Fig. 2, the utility model embodiment illustratively proposes in a kind of above-described embodiment one, pulse to be measured point
The structure of beam module 10 comprising delay cell 11 and beam splitter 12, wherein delay cell 11 is connect with beam splitter 12.
In the utility model embodiment, 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, i.e. beam splitter for pulse signal to be measured to frequency module
It is divided into 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 sends the time of the first pulse signal, so as to adjust the phase of the first pulse signal, makes the first pulse signal and output extremely
With the first monochromatic optical signal and the second monochromatic optical signal of frequency module, there is 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 utility model embodiment illustratively proposes in a kind of above-described embodiment one, monochromatic photogenerated
A kind of structure of module 20 comprising reflector element 21 and the first pulses switch unit 22, wherein reflector element 21 and the first arteries and veins
Rush the connection of converting unit 22.
In the utility model embodiment, reflector element 21 reflects the first pulse letter for accessing the second pulse signal
Number, prevent the first output of pulse signal into the first pulses switch unit；First pulses switch unit 22 is used for the second pulse
Signal is converted to two circular polarization chirped pulse signals, and exports the first monochromatic light letter according to two circular polarization chirped pulse signals
Number and the second monochromatic optical signal, due to introducing chirped pulse signal, export at this time to and frequency module the first monochromatic optical signal with
The parameter of second 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 by the embodiment of the utility model 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 utility model embodiment illustratively proposes in a kind of above-described embodiment one, monochromatic photogenerated
Another structure of module 20 comprising raster unit 23, the second pulses switch unit 24；Wherein, raster unit 23 and second
Pulses switch unit 24 connects.
In the utility model embodiment, raster unit 23 for accessing the second pulse signal, and reflects the first pulse letter
Number, and according to the second output of pulse signal angle dispersion pulse signal；Second pulses switch unit 24, for believing angle dispersion pulse
Number two circular polarization angle dispersion pulse signals are converted to, and according to two circular polarization angle dispersion the first monochromatic light of output of pulse signal
Signal and the second monochromatic optical signal, since some direction of angle dispersion pulse corresponds to an optical frequency, above-mentioned two circle
Angle dispersion pulse signal is polarized with the first pulse signal when with meeting on frequency crystal, it 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 by the embodiment of the utility model 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 utility model embodiment illustratively proposes in a kind of above-described embodiment one, phase-modulation mould
A kind of structure of block 30 comprising phase modulation unit 31 and Polarization Modulation unit 32；Wherein, phase modulation unit 31 and polarization
Modulation unit 32 connects.
In the utility model embodiment, phase modulation unit 31 is monochromatic for changing the first monochromatic optical signal and second
The initial phase of optical signal；Polarization Modulation unit 32, for changing the polarization of the first monochromatic optical signal and the second monochromatic optical signal
Direction.
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 by the embodiment of the utility model 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 utility model embodiment illustratively proposes in a kind of above-described embodiment one and frequency module 40
A kind of structure comprising focus reflector element 41 and with frequency unit 42；Wherein, it focuses reflector element 41 and connects with frequency unit 42
It connects.
In the utility model embodiment, reflector element 41 is focused, for receiving the first pulse signal and out of phase tune
The first monochromatic optical signal and the second monochromatic optical signal under system, and focus and reflex to and frequency unit；With frequency unit 42, it to be used for basis
The focusing reflected light for focusing 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 utility model embodiment illustratively proposes in a kind of above-described embodiment one, waveform analysis mould
A kind of structure of block 50 comprising shearing phase acquiring unit 51, spectroscopy unit 52 and waveshape unit 53；Wherein,
Shearing phase acquiring unit 51, spectroscopy unit 52 and waveshape unit 53 are sequentially connected.
In the utility model embodiment, shearing phase 51 is established according to multiple interference fringes for acquiring unit and is interfered
Striped Two dimensional Distribution, and Fourier transformation is carried out to Two dimensional Distribution, exchange item is extracted, shearing phase is obtained；Spectroscopy unit
52, after according to the first monochromatic optical signal and the second monochromatic optical signal and frequency under the first pulse signal and out of phase modulation
Spatial distribution, obtain the phase function of the first pulse signal；Waveshape unit 53, for the phase according to the first pulse signal
Bit function, calculates the ultrashort pulse time domain waveform of pulse signal to be measured, and restores the spectrum phase of pulse signal to be measured.
The working principle of waveform analysis module provided by the embodiment of the utility model 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 described above is only to illustrate the technical solution of the utility model, rather than its limitations；Although aforementioned reality
Example is applied the utility model is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and model of various embodiments of the utility model technical solution that it does not separate the essence of the corresponding technical solution
It encloses, should be included within the scope of protection of this utility model.
Claims (11)
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.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109084906A (en) * | 2018-08-09 | 2018-12-25 | 深圳大学 | A kind of ultrashort pulse measuring device and method |
| CN110567595A (en) * | 2019-09-11 | 2019-12-13 | 华东师范大学重庆研究院 | Real-time measurement method and system for transient ultrashort pulse time width |
| CN113959568A (en) * | 2020-07-20 | 2022-01-21 | 中国科学院大连化学物理研究所 | Measuring system and measuring method for time intensity distribution of ultrashort laser pulse |
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2018
- 2018-08-09 CN CN201821283084.4U patent/CN208537036U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109084906A (en) * | 2018-08-09 | 2018-12-25 | 深圳大学 | A kind of ultrashort pulse measuring device and method |
| CN110567595A (en) * | 2019-09-11 | 2019-12-13 | 华东师范大学重庆研究院 | Real-time measurement method and system for transient ultrashort pulse time width |
| US11143558B2 (en) | 2019-09-11 | 2021-10-12 | Chongqing Institute Of East China Normal University | Method and system for measuring transient time width of ultrashort pulse |
| CN113959568A (en) * | 2020-07-20 | 2022-01-21 | 中国科学院大连化学物理研究所 | Measuring system and measuring method for time intensity distribution of ultrashort laser pulse |
| CN113959568B (en) * | 2020-07-20 | 2023-01-20 | 中国科学院大连化学物理研究所 | Measuring system and measuring method for time intensity distribution of ultrashort laser pulse |
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