WO2020232790A1 - 超快光场的信息实时测量系统 - Google Patents
超快光场的信息实时测量系统 Download PDFInfo
- Publication number
- WO2020232790A1 WO2020232790A1 PCT/CN2019/092426 CN2019092426W WO2020232790A1 WO 2020232790 A1 WO2020232790 A1 WO 2020232790A1 CN 2019092426 W CN2019092426 W CN 2019092426W WO 2020232790 A1 WO2020232790 A1 WO 2020232790A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- time
- signal
- frequency
- dispersion
- information
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 112
- 238000005259 measurement Methods 0.000 title claims abstract description 53
- 239000000835 fiber Substances 0.000 claims abstract description 103
- 238000006243 chemical reaction Methods 0.000 claims abstract description 43
- 238000001228 spectrum Methods 0.000 claims abstract description 23
- 239000006185 dispersion Substances 0.000 claims description 95
- 238000000034 method Methods 0.000 claims description 38
- 230000003595 spectral effect Effects 0.000 claims description 30
- 230000008569 process Effects 0.000 claims description 27
- 239000013307 optical fiber Substances 0.000 claims description 24
- 230000004927 fusion Effects 0.000 claims description 19
- 239000000523 sample Substances 0.000 claims description 15
- 238000010130 dispersion processing Methods 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 11
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 8
- 230000014509 gene expression Effects 0.000 description 8
- 230000000737 periodic effect Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 239000002609 medium Substances 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000002612 dispersion medium Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005316 response function Methods 0.000 description 2
- 241000239290 Araneae Species 0.000 description 1
- 241000143248 Idaea laevigata Species 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
Definitions
- This application relates to the technical field of ultrafast signal measurement, in particular to a real-time information measurement system for ultrafast light fields.
- ultrafast light fields such as ultrafast lasers (light fields on the order of picoseconds and femtoseconds) have shown great advantages in simulating multiple types of cross-scale physics scenes and processes, and can reproduce only extreme or critical Physical phenomena that occur under conditions, such as simulating the horizons of black holes and white holes in astronomy, strange waves and turbulence in fluid mechanics, and Bose-Einstein condensation in thermodynamics.
- the detection and characterization of these processes puts high demands on the time and frequency domain resolution, time domain record length and real-time performance of ultrafast measurement technology.
- the time-frequency information of the ultrafast light field can be measured.
- the time domain resolution of these two types of methods can reach fs (femtosecond) level, the time domain measurement range is about 10ps (picosecond), and the time bandwidth product is about 104, which can measure the time of ultrafast light field to a certain extent. Descriptive information such as domains.
- the iterative speed of the algorithm and the frame rate of equipment such as spectrometers the real-time performance of traditional measurement schemes is poor.
- a real-time measurement system for ultrafast light field information including: continuous cascaded time lens optical path, first spectral light splitting component, first photodetection array, time lens time-frequency conversion optical path, second photodetection array, time domain pull Extend the single-mode optical fiber, the second spectrum splitting component and the third photodetection array;
- the continuous cascading time lens optical path amplifies the first signal in the time domain to obtain a time domain amplified signal; the first spectrum splitting component performs spectrum splitting at each spatial point position of the time domain amplified signal; the first photodetection array splits the spectrum The subsequent multiple signals are converted into electrical signals, and the time domain information of each spatial point position of the first signal is obtained;
- the time-lens time-frequency conversion optical path performs time-lens time-frequency conversion processing on the second signal;
- the second photodetection array converts the optical signal at each spatial point position in the signal processed by the time-lens time-frequency conversion into electrical signals to obtain the first The first frequency domain information of the continuous light part of the two-channel signal;
- the time-domain stretched single-mode fiber performs time-domain stretch on the third signal to realize the Fourier transform to obtain the time-frequency transform spectrum;
- the second spectral splitting component performs spectral splitting on the time-frequency transform spectrum to obtain the decoupled time-domain intersection Overlapping information;
- the third photodetection array performs photoelectric conversion on the decoupled time-domain overlapping information to obtain the second frequency domain information of the pulse light part of the third signal; the first signal, the second signal and the third signal Three signals obtained by branching the ultrafast optical field signal to be tested.
- the above-mentioned continuous cascaded time lens optical path includes a first single-mode fiber, a first pump pulse light source, a second single-mode fiber, a first high nonlinear fiber, a first optical filter, and a first dispersion. Compensation fiber
- the first single-mode fiber performs the first dispersion processing on the first signal to form the first probe light;
- the first pump pulse light source generates an ultrashort pulse sequence as the first pump pulse;
- the second single-mode fiber performs the first pump The pulse is subjected to the second dispersion treatment to form the first pump light;
- the first highly nonlinear optical fiber provides a nonlinear medium for the nonlinear parametric process between the first probe light and the first pump light;
- the first optical filter will not The first idle frequency light generated by the linear parameter process is filtered out;
- the first dispersion compensation fiber performs third dispersion processing on the first idle frequency light to obtain a time-domain amplified signal.
- the dispersion of the first single-mode fiber, the dispersion parameter of the second single-mode fiber, and the dispersion of the first dispersion compensation fiber satisfy the following imaging relationship:
- D in represents the dispersion of the first single-mode fiber
- D out represents the dispersion of the first dispersion compensation fiber
- D f represents the dispersion parameter of the second single-mode fiber
- 2D f represents the second single-mode fiber The amount of dispersion
- the time domain magnification M of the first signal is:
- the spectral bandwidth of the first pump pulse light source, the repetition frequency of the first pump pulse light source, and the dispersion parameter of the second single-mode fiber satisfy the following relationship:
- ⁇ represents the spectral bandwidth of the first pump pulse light source
- D f represents the dispersion parameter of the second single-mode fiber
- f p represents the repetition frequency of the first pump pulse light source
- the above-mentioned time lens time-frequency conversion optical path includes a third single-mode optical fiber, a second pump pulse light source, a fourth single-mode optical fiber, a second highly nonlinear optical fiber, a second optical filter, and a second dispersion compensation optical fiber;
- the third single-mode fiber applies fourth dispersion processing to the second signal to form the second probe light;
- the second pump pulse light source generates an ultrashort pulse sequence as the second pump pulse;
- the fourth single-mode fiber applies the second pump The pulse is subjected to fifth dispersion processing to form the second pump light;
- the second highly nonlinear optical fiber provides a nonlinear medium for the nonlinear parametric process between the second probe light and the second pump light;
- the second optical filter will not The second idle frequency light generated by the linear parameter process is filtered out;
- the second dispersion compensation fiber compresses the second idle frequency light to obtain a signal processed by time-lens time-frequency conversion.
- the dispersion of the third single-mode fiber, the dispersion parameter of the fourth single-mode fiber, and the dispersion of the second dispersion compensation fiber satisfy the following relationship:
- ⁇ in represents the dispersion of the third single-mode fiber
- ⁇ out represents the dispersion of the second dispersion compensation fiber
- ⁇ f represents the dispersion parameter of the fourth single-mode fiber
- 2 ⁇ f represents the fourth single-mode fiber The amount of dispersion.
- the above-mentioned real-time information measurement system of the ultrafast light field further includes a synchronous reference pulse source, an optical branching component and a fusion terminal;
- the synchronization reference pulse source generates the synchronization reference pulse signal;
- the optical branching component divides the combined ultrafast optical field signal and the synchronization reference pulse signal into the first signal, the second signal and the third signal;
- the fusion terminal reads the synchronization reference pulse signal contained in the time domain information, the first frequency domain information, and the second frequency domain information, and separates any two of the time domain information, the first frequency domain information, and the second frequency domain information.
- the third information is aligned. After the time domain information, the first frequency domain information and the second frequency domain information are aligned, the time domain information, the first frequency domain information and the second frequency domain information are fused to obtain the fused information.
- the above-mentioned real-time measurement system of ultrafast light field information further includes an analog-to-digital converter
- the above-mentioned analog-to-digital converter converts the time domain information, the first frequency domain information, and the second frequency domain information into corresponding digitized signals, and inputs the converted digitized signals into the fusion terminal.
- the aforementioned synchronization reference pulse source is a picosecond pulse laser or a femtosecond pulse laser
- the pulse repetition frequency of the synchronization reference pulse source is lower than the pulse light source frequency in the time-frequency conversion optical path of the time lens;
- the optical branching component is an optical fiber coupler.
- the above-mentioned real-time measurement system of ultrafast light field information further includes a single-frequency laser light source;
- the single-frequency laser light source generates a single-frequency laser signal; the single-frequency laser signal is used to combine with the first signal; the continuous cascade time lens optical path amplifies the combined signal in the time domain to obtain a time-domain amplified signal.
- the above-mentioned real-time measurement system for ultrafast light field information uses a continuous cascaded time lens optical path, a first spectroscopic component and a first photodetection array to measure the time domain information of each spatial point position in the ultrafast light field signal; adopts a time lens
- the time-frequency conversion optical path and the second photodetection array measure the first frequency domain information of the continuous light part of the ultrafast optical field signal; the time domain stretched single-mode fiber, the second spectrum splitting component and the third photodetection array are used to measure the ultrafast
- the second frequency domain information of the pulsed light part of the light field signal can realize the time domain information of the ultrafast light field signal, and various frequency domain information including time information and spatial information (such as the first frequency domain information and the second frequency domain information).
- the real-time measurement of information has high timeliness and improves the accuracy and completeness of the measured information.
- Fig. 1 is a schematic structural diagram of a real-time measurement system for ultrafast light field information in an embodiment
- Figure 2 is a schematic structural diagram of a real-time measurement system for ultrafast light field information in another embodiment
- Fig. 3 is a schematic structural diagram of a real-time measurement system for ultrafast light field information in another embodiment
- FIG. 4 is a schematic diagram of the relative intensity of the signal to be measured in the time domain according to an embodiment
- FIG. 5 is a schematic diagram of a comparison of simulation results corresponding to the distribution of the existing measurement system and the measurement system provided by the present invention in an embodiment
- Figure 6 is a schematic diagram of the simulation results of the existing measurement system
- Fig. 7 is a schematic diagram of simulation results corresponding to the measurement system of the present invention in an embodiment
- Fig. 8 is a schematic diagram of the amplitude and phase information of the picosecond pulse in the time domain in an embodiment.
- a real-time measurement system of ultrafast light field information which includes: a continuous cascaded time lens optical path 11, a first spectral splitting component 12, and a first photodetection array 13 , Time lens time-frequency conversion optical path 21, second photodetection array 22, time-domain stretched single-mode optical fiber 31, second spectrum splitting component 32 and third photodetection array 33;
- the continuous cascade time lens optical path 11 amplifies the first signal in the time domain to obtain a time domain amplified signal; the first spectrum splitting component 12 performs spectrum splitting at each spatial point position of the time domain amplified signal; the first photodetection array 13 Convert the spectrally split multiple signals into electrical signals, and obtain the time domain information of the positions of the spatial points of the first signal;
- the time-lens time-frequency conversion optical path 21 performs time-lens time-frequency conversion processing on the second signal;
- the second photodetection array 22 converts the optical signal at each spatial point position in the signal after the time-lens time-frequency conversion processing into an electrical signal, Obtain the first frequency domain information of the continuous light part of the second signal;
- the time-domain stretched single-mode optical fiber 31 performs time-domain stretch on the third signal to achieve Fourier transform to obtain the time-frequency transform spectrum; the second spectral splitting component 32 performs spectral splitting of the time-frequency transform spectrum to obtain the decoupling time Domain overlap information; the third photodetection array 33 performs photoelectric conversion on the decoupled time domain overlap information to obtain the second frequency domain information of the pulse light part of the third signal; the first signal, the second signal, and the first signal
- the three-channel signal is the three-channel signal obtained by branching the ultrafast optical field signal to be tested.
- the first photodetection array 13, the second photodetection array 22, and the third photodetection array 33 are high-speed photodetection arrays, which can efficiently convert the corresponding input signal into the corresponding electrical signal, so as to facilitate the corresponding information (such as time domain). Information, the first frequency domain information and the second frequency domain information) identification and other processing.
- the aforementioned time-lens time-frequency conversion optical path 21 is a high-refresh rate time-frequency conversion optical path, which can improve the timeliness of the time-frequency conversion processing of the time lens.
- the above-mentioned time-domain stretched single-mode fiber 31 may be a third dispersion compensation fiber or a chirped fiber Bragg grating, so as to smoothly perform a time-domain stretch on the third signal to realize Fourier transform.
- the above-mentioned real-time information measurement system for the ultrafast light field uses a continuous cascaded time lens optical path 11, a first spectral beam splitter 12 and a first photodetection array 13 to measure the time domain information of each spatial point position in the ultrafast light field signal;
- the time-lens time-frequency conversion optical path 21 and the second photodetection array 22 are used to measure the first frequency domain information of the continuous light part of the ultrafast optical field signal;
- the three-photoelectric detection array 33 measures the second frequency domain information of the pulsed light part of the ultrafast light field signal, and can realize the time domain information of the ultrafast light field signal, and various frequency domain information including time information and space information (such as the first The real-time measurement of frequency domain information and second frequency domain information) has high timeliness and improves the accuracy and completeness of the measured information.
- the above-mentioned continuous cascaded time lens optical path includes a first single-mode fiber, a first pump pulse light source, a second single-mode fiber, a first high nonlinear fiber, a first optical filter, and a first dispersion. Compensation fiber
- the first single-mode fiber performs the first dispersion processing on the first signal to form the first probe light;
- the first pump pulse light source generates an ultrashort pulse sequence as the first pump pulse;
- the second single-mode fiber performs the first pump The pulse is subjected to the second dispersion treatment to form the first pump light;
- the first highly nonlinear optical fiber provides a nonlinear medium for the nonlinear parametric process between the first probe light and the first pump light;
- the first optical filter will not The first idle frequency light generated by the linear parameter process is filtered out;
- the first dispersion compensation fiber performs third dispersion processing on the first idle frequency light to obtain a time-domain amplified signal.
- the first signals may be directly input or a single-frequency laser signal after a first single-mode fiber beam combiner, the first single-mode fiber subjected to dispersion D in, the above dispersion amount D in the first single mode fiber may also be referred to as The "object distance" of the optical path of the continuous cascade time lens.
- the above-mentioned first pump pulse light source, second single-mode fiber, first highly nonlinear fiber, and first optical filter assist each other to apply the time domain signal to the optical field signal (first probe light) after the first dispersion processing Periodic secondary phase modulation
- the frequency of the periodic secondary phase modulation is f and the width of the modulation window is T f , which can realize the time lens function.
- the magnification M of the optical path of the continuous cascade time lens, the frequency f of the periodic secondary phase modulation, and the modulation window width T f satisfy the following relationship:
- the above-mentioned periodic secondary phase modulation method may be an electro-optical phase modulator or an optical parameter frequency conversion process based on a chirped pulse sequence.
- the dispersion parameter D f of the second single-mode fiber can also be referred to as the "focal length" of the corresponding time lens function.
- the dispersion amount D out of the first dispersion compensation fiber described above may also be referred to as the "image distance" of the optical path of the continuous cascade time lens.
- the above-mentioned first optical filter may be an optical fiber bandpass filter or a wavelength division multiplexer, which is used in the continuous cascade time lens optical path to filter out the idle frequency light generated by the nonlinear parameter process to ensure the filtering effect .
- the dispersion of the first single-mode fiber, the dispersion parameter of the second single-mode fiber, and the dispersion of the first dispersion compensation fiber satisfy the following imaging relationship:
- D in represents the dispersion of the first single-mode fiber
- D out represents the dispersion of the first dispersion compensation fiber
- D f represents the dispersion parameter of the second single-mode fiber
- 2D f represents the second single-mode fiber The amount of dispersion
- the time domain magnification M of the first signal is:
- the spectral bandwidth of the first pump pulse light source, the repetition frequency of the first pump pulse light source, and the dispersion parameter of the second single-mode fiber satisfy the following relationship:
- ⁇ represents the spectral bandwidth of the first pump pulse light source
- D f represents the dispersion parameter of the second single-mode fiber
- f p represents the repetition frequency of the first pump pulse light source
- This embodiment can perform a more precise time domain amplification on the first signal, which ensures the accuracy of the time domain amplified signal obtained.
- the above-mentioned first signal can be input to the continuous cascade time lens optical path directly or after being combined with a single-frequency laser.
- the expression of the input light field is:
- e r is the optical field amplitude of the single-frequency laser
- e s (t) is the amplitude of the first signal
- Is the phase of the first signal
- ⁇ is the center optical frequency difference between the first signal and the single-frequency laser signal
- a in (t) represents the signal after the first signal is combined with the single-frequency laser
- t is the time variable
- i is an imaginary unit.
- the pump end of the continuous cascade time lens must meet:
- a in (t) and A in ( ⁇ ) are the expressions of the signal in the time domain and frequency domain after the first signal is combined with the single-frequency laser signal, and A out (t) is the continuous cascading time
- the output signal of the lens optical path symbol Represents the Fourier transform in the time-frequency domain, the symbol Represents the inverse Fourier transform in the time-frequency domain, t represents the time variable, ⁇ represents the frequency variable, i is the imaginary unit, the symbol " ⁇ " represents proportional to, and D in and D out are the continuous cascaded time lens optical path
- D f represents the modulation parameter used in the periodic secondary phase modulation process, and M represents the amplification factor, ⁇ represents the spectral bandwidth of the first pump pulse light source, and f p represents the repetition frequency of the first pump pulse light source.
- the first signal directly input has been amplified in the time domain, and the coherent optical field signal combined with the single-frequency laser can be used to reverse the input from the modulation signal in the time domain using the Fourier domain filtering method after being amplified in the time domain.
- Ultra-fast light field signal Ultra-fast light field signal.
- this example can use the spectral splitting method to decouple the time-domain overlap signal at the output.
- the light field of the continuous cascade time lens optical path passes through the first spectral splitting component to obtain the decoupled intensity signal, as shown in the following formula:
- H( ⁇ - ⁇ 0 ) is the spectral response function
- ⁇ 0 is the center frequency
- a out (t) is the output signal of the continuous cascaded time lens optical path
- a in is the first signal combined with the single frequency laser
- A(t; ⁇ 0 ) is the output signal after passing through the first spectral spectroscopic accessory.
- the signal after the spectrum splitting is received by the high-speed photodetection array and converted into an electrical signal to realize the collection and recording of time domain information to obtain the time domain information of each spatial point position of the first signal.
- the above-mentioned time lens time-frequency conversion optical path includes a third single-mode optical fiber, a second pump pulse light source, a fourth single-mode optical fiber, a second highly nonlinear optical fiber, a second optical filter, and a second dispersion compensation optical fiber;
- the third single-mode fiber applies fourth dispersion processing to the second signal to form the second probe light;
- the second pump pulse light source generates an ultrashort pulse sequence as the second pump pulse;
- the fourth single-mode fiber applies the second pump The pulse is subjected to fifth dispersion processing to form the second pump light;
- the second highly nonlinear optical fiber provides a nonlinear medium for the nonlinear parametric process between the second probe light and the second pump light;
- the second optical filter will not The second idle frequency light generated by the linear parameter process is filtered out;
- the second chromatic dispersion compensation fiber compresses the second idle frequency light to obtain the signal processed by the time-lens time-frequency transform (ie, the initial frequency domain information corresponding to the first frequency domain information).
- the above-mentioned second optical filter may be an optical fiber bandpass filter or a wavelength division multiplexer, which is used in the time-lens time-frequency conversion optical path to filter out the idle frequency light generated by the nonlinear parameter process to ensure the filtering effect.
- the dispersion ⁇ in of the third single-mode fiber mentioned above can also be referred to as the "object distance" of the time-lens time-frequency conversion optical path.
- the second pump pulse light source, the fourth single-mode fiber, the second highly nonlinear fiber, and the second optical filter work together to realize the periodicity of the optical field signal (second probe light) obtained by the fourth dispersion processing.
- Sub-phase modulation To realize the time lens function, the “focal length” of the time lens is ⁇ f , that is, the dispersion amount of the second dispersion compensation fiber.
- the method of periodic secondary phase modulation may be an electro-optic phase modulator or an optical parameter frequency conversion process based on a chirped pulse sequence.
- the dispersion amount ⁇ out of the second dispersion compensation fiber described above may also be referred to as the "image distance" of the time-lens time-frequency conversion optical path.
- the dispersion of the third single-mode fiber, the dispersion parameter of the fourth single-mode fiber, and the dispersion of the second dispersion compensation fiber satisfy the following relationship:
- ⁇ in represents the dispersion of the third single-mode fiber
- ⁇ out represents the dispersion of the second dispersion compensation fiber
- ⁇ f represents the dispersion parameter of the fourth single-mode fiber
- 2 ⁇ f represents the fourth single-mode fiber The amount of dispersion.
- This embodiment can perform more accurate time-lens time-frequency transformation processing on the second signal, thereby ensuring the accuracy of the obtained first frequency domain information.
- the second signal enters the time-frequency conversion optical path of the high refresh rate time lens, where the frequency domain measurement process of the continuous light part can be analogous to the Fourier transform process in the spatial lens 2-f system.
- the image of the continuous light component after the time lens can be expressed as:
- the rectangular function Describes the time domain pulse as an equivalent lens
- ⁇ p represents the pump frequency
- ⁇ s represents the signal light frequency
- 2 ⁇ f represents the amount of dispersion at the pump end in the optical path of the high refresh rate time lens
- the symbol " ⁇ " represents proportional to
- i represents the imaginary unit
- a cw (t) represents the light field expression of the continuous light part
- E TL (t) represents the image of the continuous light part after the time lens.
- the time-frequency Fourier transform is realized on the image surface after dispersion at the output end, as shown in the following formula:
- ET LS (t) is the expression of the light field output through the high refresh rate time lens optical path
- 2 ⁇ f and ⁇ out are the dispersion amounts of the pump end and output end in the high refresh rate time lens optical path
- ⁇ 2 ⁇ p - ⁇ s
- sinc function variables carry information Delta] [omega frequency ⁇ s of the continuous light, and in the condition 2 ⁇ out ⁇ P ⁇ T R, wherein, ⁇ P represents time lens
- TR represents the pulse interval time of the pump pulse, and the time-domain signal overlap problem in the time-stretched time-frequency conversion optical path will not occur.
- the ultra-fast light field signal is converted into an electrical signal by the high-speed photodetection array after passing through the time-frequency conversion optical path of the high refresh rate time lens to realize the collection and recording of the frequency domain information of the continuous light part, so as to obtain the second continuous light part of the signal.
- a frequency domain information is converted into an electrical signal by the high-speed photodetection array after passing through the time-frequency conversion optical path of the high refresh rate time lens to realize the collection and recording of the frequency domain information of the continuous light part, so as to obtain the second continuous light part of the signal.
- a frequency domain information is converted into an electrical signal by the high-speed photodetection array after passing through the time-frequency conversion optical path of the high refresh rate time lens to realize the collection and recording of the frequency domain information of the continuous light part, so as to obtain the second continuous light part of the signal.
- the third signal enters the time-domain stretched dispersion component, and after the time stretched, the ultrafast light field to be measured completes the time-frequency Fourier transform.
- the output signal intensity I TSS (t) can be expressed as:
- a p ( ⁇ ) is the expression in the frequency domain of the light field of the third signal pulse light
- ⁇ TS represents the dispersion of the time-domain stretched dispersion component
- i represents the imaginary unit
- t represents the time variable
- time-domain signal overlap will occur after time-stretched time-frequency transformation.
- This example proposes to use the method of spectral light splitting to decouple the time-domain overlap signal at the output end, and the time-domain light field output by the time-domain stretching dispersive component obtains the decoupled intensity signal through the second spectral splitting component, as shown in the following formula:
- H( ⁇ - ⁇ 0 ) is the spectral response function
- ⁇ 0 is the center frequency
- the above-mentioned real-time measurement system for ultrafast light field information further includes a synchronization reference pulse source 41, an optical branching component 42 and a fusion terminal 43;
- the synchronization reference pulse source 41 generates a synchronization reference pulse signal;
- the optical splitting component 42 divides the combined ultrafast optical field signal and the synchronization reference pulse signal into a first signal, a second signal and a third signal;
- the fusion terminal 43 reads the synchronization reference pulse signal contained in the time domain information, the first frequency domain information, and the second frequency domain information, and combines any two of the time domain information, the first frequency domain information, and the second frequency domain information.
- the third information is aligned separately, and after the time domain information, the first frequency domain information and the second frequency domain information are aligned, the time domain information, the first frequency domain information and the second frequency domain information are fused to obtain the fused information.
- the aforementioned fusion terminal 43 is an intelligent terminal that has processing functions such as receiving various signals and aligning and fusing corresponding signals.
- the fusion terminal 43 can read the synchronization reference pulse signal contained in the time domain information, the first frequency domain information, and the second frequency domain information, and combine any two of the time domain information, the first frequency domain information, and the second frequency domain information.
- the information is respectively aligned with the third information in the time domain information, the first frequency domain information and the second frequency domain information except for the above two information, so as to realize the time domain information, the first frequency domain information and the second frequency domain information. Aligned.
- the fusion terminal 43 Before aligning the time domain information, the first frequency domain information, and the second frequency domain information, the fusion terminal 43 can convert the time domain information, the first frequency domain information, and the second frequency domain information into corresponding digital signals, respectively, and then perform The alignment of the three to ensure the accuracy of the alignment results.
- the synchronization reference pulse signal generated by the synchronization reference pulse source 41 may carry alignment marks.
- the fusion terminal 43 reads the alignment marks carried by the time domain information, the first frequency domain information and the second frequency domain information, and combines the time domain information and the second frequency domain information. Any two pieces of information in the first frequency domain information and the second frequency domain information are respectively aligned with the third information to improve the corresponding alignment efficiency.
- the fusion terminal 43 aligns the time domain information, the first frequency domain information, and the second frequency domain information, the time domain information, the first frequency domain information, and the second frequency domain information are fused, so that the resulting fusion information can include ultrafast light.
- the time domain information, spatial domain information and frequency domain information of the field signal have high integrity.
- the above-mentioned real-time measurement system of ultrafast light field information further includes an analog-to-digital converter
- the above-mentioned analog-to-digital converter converts the time domain information, the first frequency domain information, and the second frequency domain information into corresponding digitized signals, and inputs the converted digitized signals to the fusion terminal, so that the fusion terminal is directed to the time domain information,
- the digitized signals corresponding to the first frequency domain information and the second frequency domain information are aligned and fused to ensure the accuracy of related processing.
- the above-mentioned analog-to-digital converter is a high-speed electrical analog-to-digital converter to ensure the efficiency of the corresponding digital conversion process, so that the obtained digital signal is easier to collect or read, and to facilitate related back-end data processing.
- the aforementioned synchronization reference pulse source is a picosecond pulse laser or a femtosecond pulse laser; the synchronization reference pulse signal generated by it is more stable, which can effectively ensure that the subsequent fusion terminal performs time domain information, first frequency domain information, and first frequency information. Second, the accuracy of the frequency domain information alignment work.
- the pulse repetition frequency of the above-mentioned synchronization reference pulse source is lower than the frequency of the pulse light source in the time-frequency conversion optical path of the time lens; the synchronization reference pulse signal carried by the second signal is weakened for time lensing in the time-frequency conversion optical path of the time lens Interference caused by the time-frequency conversion process.
- the above-mentioned optical branching component is an optical fiber coupler to accurately branch the combined ultrafast optical field signal and the synchronization reference pulse signal to obtain the first signal, the second signal and the third signal. Road signal.
- the time axis of each acquisition signal is corrected based on the synchronization reference pulse signal, Obtain time-frequency information under a unified time axis.
- the phase information of the light field is retrieved based on the generalized projection method, and the phase information of the ultrafast light field is reconstructed by the following iterative relationship under the assumption of the initial phase:
- I M (t) and They are the measurement samples in the time domain and frequency domain, respectively, u t1 (t) is the light field expression in the time domain of iteration step 1 in the generalized projection method, and ⁇ 0 (t) is the light field u t0 (t) in iteration step 4 U ⁇ 0 ( ⁇ ) is the frequency domain expression of the light field obtained according to u t1 (t) in iteration step 2, u ⁇ 1 ( ⁇ ) is the frequency domain measurement sample and u ⁇ 0 ( ⁇ ).
- the frequency domain expression obtained from the phase information of) is used to reconstruct the data, and real-time ultrafast measurement of the time-frequency information of the ultrafast light field signal can be realized.
- the above-mentioned real-time measurement system for ultrafast light field information further includes a single-frequency laser light source 14;
- the single-frequency laser light source 14 generates a single-frequency laser signal; the single-frequency laser signal is used for beam combination with the first signal; the continuous cascade time lens optical path 11 performs time domain amplification on the combined signal to obtain a time domain amplified signal.
- the single-frequency laser light source 14 can be used to load the time-space domain phase information onto the intensity information of the first signal by means of interference, so that the first signal and the single-frequency laser signal can be combined to make the first signal and The single-frequency laser signal coherently forms a modulated signal, and the amplitude and phase information of the original signal can be restored by demodulating the modulated signal.
- the relative intensity in the time domain of the signal to be measured with a time length of 5 ns is shown in Fig. 4, and the comparison chart of the simulation results of ultrafast light field information measurement performed by the existing measurement system and the measurement system provided by the present invention can be Referring to Fig. 5, it can be seen from Fig. 5 that the recording time length of the existing measurement system is limited, and the obtained measurement results are non-time domain continuous measurement results, while the measurement system of the present invention can completely collect the time domain of the signal to be measured. information.
- the existing measurement system and the measurement system of the present invention are used to test the signal to be measured with a time length of 9 ns.
- the simulation result after the existing measurement system is shown in Fig. 6. It can be seen from Fig. 6 that the measured result has a low spectral resolution and does not have the ability to identify the continuous light part of the signal to be measured.
- the simulation result after the measurement system of the present invention is shown in FIG. 7, and compared with the result in FIG. 6, it can be seen that the measurement system of the present invention has the ability to distinguish the continuous light part in the ultrafast light field, and the measurement refresh rate reaches 1 GHz.
- the time domain and frequency domain information of the ultrafast optical field measured by the measurement system of the present invention can be used to obtain the amplitude and phase information of the picosecond pulse in the time domain, as shown in FIG. 8.
- the above-mentioned real-time information measurement system of ultrafast light field obtains the amplified time domain light field signal containing all details through the continuous cascaded time lens optical path. After the time domain overlap of the spectral decoupling signal, the time domain is realized by the high-speed photoelectric detection array. Real-time measurement of the signal waveform in the domain; at the same time, the time-lens optical path and the time-domain stretching dispersive component are used to complete the time-frequency Fourier transform of the continuous light part and the pulsed light part of the optical field.
- the photoelectric detection array realizes real-time measurement of high refresh rate frequency domain information, uses reference pulse source to synchronize, calibrates each signal and uses inversion algorithm to fuse time-frequency information, and finally achieves high refresh rate (refresh rate greater than 1GHz), high time and frequency resolution Real-time ultra-fast measurement of ultra-fast light field time-frequency information with high speed (time resolution up to about 50fs and spectral resolution up to about 1pm).
- first ⁇ second ⁇ third involved in the embodiments of this application only distinguishes similar objects, and does not represent a specific order of objects. Understandably, “first ⁇ second ⁇ third” “Three” can be interchanged in a specific order or sequence when permitted. It should be understood that the objects distinguished by “first ⁇ second ⁇ third” can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
- the "plurality” mentioned herein means two or more.
- “And/or” describes the association relationship of the associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone.
- the character “/” generally indicates that the associated objects are in an "or” relationship.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
一种超快光场的信息实时测量系统，包括连续级联式时间透镜光路（11）、第一光谱分光部件（12）、第一光电探测阵列（13）、时间透镜时频变换光路（21）、第二光电探测阵列（22）、时域拉伸单模光纤（31）、第二光谱分光部件（32）和第三光电探测阵列（33）；其中，采用连续级联式时间透镜光路（11）、第一光谱分光部件（12）和第一光电探测阵列（13）测量超快光场信号中各个空间点位置的时域信息；采用时间透镜时频变换光路（21）、第二光电探测阵列（22）测量超快光场信号中连续光部分的第一频域信息；采用时域拉伸单模光纤（31）、第二光谱分光部件（32）和第三光电探测阵列（33）测量超快光场信号中脉冲光部分的第二频域信息。采用超快光场的信息实时测量系统能够实现对超快光场信号时域信息和各类频域信息的实时测量。
Description
本申请涉及超快信号测量技术领域，特别是涉及一种超快光场的信息实时测量系统。
近年来，超快激光等超快光场(皮秒、飞秒时间量级的光场)在模拟多类跨尺度的物理学图景和过程中显现出巨大优势，能够重现仅在极端或临界条件下发生的物理学现象，如模拟天文学中黑洞和白洞视界、流体力学中怪波和湍流、热力学中玻色-爱因斯坦凝聚等。而对于这些过程的探测和表征对超快测量技术的时、频域分辨率、时域记录长度和实时性方面提出了很高的要求。
目前，基于较为成熟的FROG和SPIDER技术可以对超快光场的时频信息进行测量。这两类方法的时域分辨率均可达fs(飞秒)级别，时域测量范围约为10ps(皮秒)，时间带宽积约为104，能在一定程度上测量超快光场的时域等相关描述信息。但由于受限于其中采用算法的迭代速度和光谱仪等设备的帧速，传统测量方案的实时性较差。
发明内容
基于此，有必要针对上述技术问题，提供一种能够实时获得超快光场的信息实时测量系统。
一种超快光场的信息实时测量系统，包括：连续级联式时间透镜光路、第一光谱分光部件、第一光电探测阵列、时间透镜时频变换光路、第二光电探测 阵列、时域拉伸单模光纤、第二光谱分光部件和第三光电探测阵列；
连续级联式时间透镜光路将第一路信号进行时域放大，得到时域放大信号；第一光谱分光部件在时域放大信号的各个空间点位置进行光谱分光；第一光电探测阵列将光谱分光后的多路信号转换为电信号，得到第一路信号各个空间点位置的时域信息；
时间透镜时频变换光路对第二路信号进行时间透镜时频变换处理；第二光电探测阵列将时间透镜时频变换处理后的信号中各个空间点位置处的光信号转变为电信号，得到第二路信号连续光部分的第一频域信息；
时域拉伸单模光纤对第三路信号进行时域拉伸，实现傅里叶变换，得到时频变换光谱；第二光谱分光部件对时频变换光谱进行光谱分光，得到解耦时域交叠信息；第三光电探测阵列对解耦时域交叠信息进行光电转换，得到第三路信号脉冲光部分的第二频域信息；上述第一路信号、第二路信号和第三路信号为待测的超快光场信号分路得到的三路信号。
在一个实施例中，上述连续级联式时间透镜光路包括第一单模光纤、第一泵浦脉冲光源、第二单模光纤、第一高非线性光纤、第一光学滤波器和第一色散补偿光纤；
第一单模光纤对第一路信号进行第一色散处理，形成第一探测光；第一泵浦脉冲光源产生超短脉冲序列作为第一泵浦脉冲；第二单模光纤对第一泵浦脉冲施加第二色散处理，形成第一泵浦光；第一高非线性光纤为第一探测光和第一泵浦光之间的非线性参量过程提供非线性媒介；第一光学滤波器将非线性参量过程产生的第一闲频光滤出；第一色散补偿光纤对第一闲频光进行第三色散处理，得到时域放大信号。
作为一个实施例，上述第一单模光纤的色散量、第二单模光纤的色散参数 和第一色散补偿光纤的色散量满足如下成像关系式：
式中，D
in表示第一单模光纤的色散量，D
out表示第一色散补偿光纤的色散量，D
f表示第二单模光纤的色散参数，相应地，2D
f表示第二单模光纤的色散量；
第一路信号的时域放大倍数M为：
作为一个实施例，上述第一泵浦脉冲光源的光谱带宽、第一泵浦脉冲光源的重复频率和第二单模光纤的色散参数，满足如下关系式：
式中，Ω表示第一泵浦脉冲光源的光谱带宽，D
f表示第二单模光纤的色散参数，f
p表示第一泵浦脉冲光源的重复频率。
在一个实施例中，上述时间透镜时频变换光路包括第三单模光纤、第二泵浦脉冲光源、第四单模光纤、第二高非线性光纤、第二光学滤波器和第二色散补偿光纤；
第三单模光纤对第二路信号施加第四色散处理，形成第二探测光；第二泵浦脉冲光源产生超短脉冲序列作为第二泵浦脉冲；第四单模光纤对第二泵浦脉冲施加第五色散处理，形成第二泵浦光；第二高非线性光纤为第二探测光和第二泵浦光之间的非线性参量过程提供非线性媒介；第二光学滤波器将非线性参量过程产生的第二闲频光滤出；第二色散补偿光纤压缩第二闲频光，得到时间透镜时频变换处理后的信号。
作为一个实施例，上述第三单模光纤的色散量、第四单模光纤的色散参数和第二色散补偿光纤的色散量，满足如下关系式：
Φ
in＝Φ
out＝Φ
f，
式中，Φ
in表示第三单模光纤的色散量，Φ
out表示第二色散补偿光纤的色散量，Φ
f表示第四单模光纤的色散参数，相应地，2Φ
f表示第四单模光纤的色散量。
在一个实施例中，上述超快光场的信息实时测量系统还包括同步参考脉冲源、光学分路部件和融合终端；
同步参考脉冲源产生同步参考脉冲信号；光学分路部件将合束后的超快光场信号和同步参考脉冲信号分为第一路信号、第二路信号和第三路信号；
融合终端读取时域信息、第一频域信息和第二频域信息分别包含的同步参考脉冲信号，将时域信息、第一频域信息和第二频域信息中的任意两个信息分别对准第三个信息，在时域信息、第一频域信息和第二频域信息对准之后，融合时域信息、第一频域信息和第二频域信息，得到融合信息。
作为一个实施例，上述超快光场的信息实时测量系统还包括模数转换器；
上述模数转换器将时域信息、第一频域信息和第二频域信息分别转换为相应的数字化信号，并将转换得到的各个数字化信号输入融合终端。
作为一个实施例，上述同步参考脉冲源为皮秒脉冲激光器或飞秒脉冲激光器；
和/或，同步参考脉冲源的脉冲重复频率低于时间透镜时频变换光路中的脉冲光源频率；
和/或，光学分路部件为光纤型耦合器。
在一个实施例中，上述超快光场的信息实时测量系统还包括单频激光光源；
单频激光光源产生单频激光信号；单频激光信号用于与第一路信号合束；连续级联式时间透镜光路将合束后的信号进行时域放大，得到时域放大信号。
上述超快光场的信息实时测量系统，采用连续级联式时间透镜光路、第一 光谱分光部件和第一光电探测阵列测量超快光场信号中各个空间点位置的时域信息；采用时间透镜时频变换光路、第二光电探测阵列测量超快光场信号中连续光部分的第一频域信息；采用时域拉伸单模光纤、第二光谱分光部件和第三光电探测阵列测量超快光场信号中脉冲光部分的第二频域信息，能够实现对超快光场信号时域信息、包括时间信息和空间信息的各类频域信息(如第一频域信息和第二频域信息)的实时测量，具有较高的时效性，提高了所测量的信息的准确性和完整性。
图1为一个实施例中超快光场的信息实时测量系统的结构示意图；
图2为另一个实施例中超快光场的信息实时测量系统的结构示意图；
图3为另一个实施例中超快光场的信息实时测量系统的结构示意图；
图4为一个实施例的待测信号时域相对强度示意图；
图5为一个实施例中现有测量系统和本发明提供的测量系统分布对应的仿真结果对比示意图；
图6为现有测量系统的仿真结果示意图；
图7为一个实施例中本发明的测量系统对应的仿真结果示意图；
图8为一个实施例中皮秒脉冲在时域上的幅度和相位信息示意图。
为了使本申请的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本申请进行进一步详细说明。应当理解，此处描述的具体实施例仅仅用以解释本申请，并不用于限定本申请。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在一个实施例中，如图1所示，提供了一种超快光场的信息实时测量系统，包括：连续级联式时间透镜光路11、第一光谱分光部件12、第一光电探测阵列13、时间透镜时频变换光路21、第二光电探测阵列22、时域拉伸单模光纤31、第二光谱分光部件32和第三光电探测阵列33；
连续级联式时间透镜光路11将第一路信号进行时域放大，得到时域放大信号；第一光谱分光部件12在时域放大信号的各个空间点位置进行光谱分光；第一光电探测阵列13将光谱分光后的多路信号转换为电信号，得到第一路信号各个空间点位置的时域信息；
时间透镜时频变换光路21对第二路信号进行时间透镜时频变换处理；第二光电探测阵列22将时间透镜时频变换处理后的信号中各个空间点位置处的光信号转变为电信号，得到第二路信号连续光部分的第一频域信息；
时域拉伸单模光纤31对第三路信号进行时域拉伸，实现傅里叶变换，得到时频变换光谱；第二光谱分光部件32对时频变换光谱进行光谱分光，得到解耦时域交叠信息；第三光电探测阵列33对解耦时域交叠信息进行光电转换，得到第三路信号脉冲光部分的第二频域信息；上述第一路信号、第二路信号和第三路信号为待测的超快光场信号分路得到的三路信号。
上述第一光电探测阵列13、第二光电探测阵列22和第三光电探测阵列33分别为高速光电探测阵列，能高效地将输入的相应信号转换为相应电信号，以 便于相应信息(如时域信息、第一频域信息和第二频域信息)的识别和其他处理。上述时间透镜时频变换光路21为高刷新率时间透镜时频变换光路，可以提高时间透镜时频变换处理的时效性。上述时域拉伸单模光纤31可以为第三色散补偿光纤或啁啾光纤布拉格光栅，以顺利对第三路信号进行时域拉伸，实现傅里叶变换。
上述超快光场的信息实时测量系统，采用连续级联式时间透镜光路11、第一光谱分光部件12和第一光电探测阵列13测量超快光场信号中各个空间点位置的时域信息；采用时间透镜时频变换光路21、第二光电探测阵列22测量超快光场信号中连续光部分的第一频域信息；采用时域拉伸单模光纤31、第二光谱分光部件32和第三光电探测阵列33测量超快光场信号中脉冲光部分的第二频域信息，能够实现对超快光场信号时域信息、包括时间信息和空间信息的各类频域信息(如第一频域信息和第二频域信息)的实时测量，具有较高的时效性，提高了所测量的信息的准确性和完整性。
在一个实施例中，上述连续级联式时间透镜光路包括第一单模光纤、第一泵浦脉冲光源、第二单模光纤、第一高非线性光纤、第一光学滤波器和第一色散补偿光纤；
第一单模光纤对第一路信号进行第一色散处理，形成第一探测光；第一泵浦脉冲光源产生超短脉冲序列作为第一泵浦脉冲；第二单模光纤对第一泵浦脉冲施加第二色散处理，形成第一泵浦光；第一高非线性光纤为第一探测光和第一泵浦光之间的非线性参量过程提供非线性媒介；第一光学滤波器将非线性参量过程产生的第一闲频光滤出；第一色散补偿光纤对第一闲频光进行第三色散处理，得到时域放大信号。
第一路信号可以直接或者与单频激光信号合束后输入第一单模光纤，使第 一单模光纤对其进行色散D
in，上述第一单模光纤的色散量D
in也可以称为连续级联式时间透镜光路的“物距”。上述第一泵浦脉冲光源、第二单模光纤、第一高非线性光纤和第一光学滤波器相互协助，可以对第一色散处理后的光场信号(第一探测光)施加时域上的周期性二次相位调制
上述周期性二次相位调制的频率为f，调制窗口宽度为T
f，能够实现时间透镜功能。具体地，连续级联式时间透镜光路的放大倍数M、周期性二次相位调制的频率f和调制窗口宽度T
f满足如下关系式：
上述周期性二次相位调制的方法可以是电光型相位调制器或是基于啁啾脉冲序列的光参量频率转换过程。第二单模光纤的色散参数D
f也可以称为相应时间透镜功能的“焦距”。
上述第一色散补偿光纤的色散量D
out也可以称为连续级联式时间透镜光路的“像距”。上述第一光学滤波器可以为光纤型带通滤波器或波分复用器，在连续级联式时间透镜光路中用于将非线性参量过程产生的闲频光滤出，以保证滤出效果。
作为一个实施例，上述第一单模光纤的色散量、第二单模光纤的色散参数和第一色散补偿光纤的色散量满足如下成像关系式：
式中，D
in表示第一单模光纤的色散量，D
out表示第一色散补偿光纤的色散量，D
f表示第二单模光纤的色散参数，相应地，2D
f表示第二单模光纤的色散量；
第一路信号的时域放大倍数M为：
作为一个实施例，上述第一泵浦脉冲光源的光谱带宽、第一泵浦脉冲光源的重复频率和第二单模光纤的色散参数，满足如下关系式：
式中，Ω表示第一泵浦脉冲光源的光谱带宽，D
f表示第二单模光纤的色散参数，f
p表示第一泵浦脉冲光源的重复频率。
本实施例能够对第一路信号进行更为精准地时域放大，保证了所获得的时域放大信号的准确性。
在一个示例中，上述第一路信号可以直接或者和单频激光合束后输入连续级联式时间透镜光路，输入光场的表达式为：
在第一路信号与单频激光信号合束的情况下，e
r为单频激光的光场振幅，e
s(t)为第一路信号的幅度，
为第一路信号的相位，Δω为第一路信号与单频激光信号的中心光频率差，A
in(t)表示第一路信号与单频激光合束后的信号，t为时间变量，i为虚数单位。基于时空对应原理，连续级联式时间透镜光路中输入端色散、泵浦端色散和输出端色散在满足成像关系的情况下可以实现M倍数的时域放大，如下式所示：
连续级联式时间透镜的泵浦端需满足：
其中，A
in(t)和A
in(ω)分别为第一路信号与单频激光信号合束后信号在时域和频域上的表达式，A
out(t)为连续级联式时间透镜光路的输出信号，符号
表示时频域上的傅里叶变换，符号
表示时频域上的傅里叶逆变换，t表 示时间变量，ω表示频率变量，i为虚数单位，符号“∝”表示正比于，D
in和D
out分别为连续级联式时间透镜光路中输入端色散介质(第一单模光纤)和输出端色散介质(第一色散补偿光纤)的色散量大小，D
f表示所述周期性二次相位调制过程采用的调制参数，M表示放大倍数，Ω表示第一泵浦脉冲光源的光谱带宽，f
p表示第一泵浦脉冲光源的重复频率。直接输入的第一路信号得到了时域放大，同时和单频激光合束后的相干光场信号在被时域放大后可以从时域的调制信号中利用傅里叶域滤波方法反推输入的超快光场信号。
由于长时间尺度的光场在经历时域放大后会出现信号时域交叠问题，本示例可以利用光谱分光的方法解耦输出端时域交叠信号。经连续级联式时间透镜光路的光场通过第一光谱分光部件得到解耦后的强度信号，如下式所示：
其中，H(ω-ω
0)为频谱响应函数，ω
0为中心频率，A
out(t)为连续级联式时间透镜光路的输出信号，A
in为第一路信号与单频激光合束后的信号，A(t；ω
0)为经第一光谱分光附件后的输出信号。光谱分光后的信号被高速光电探测阵列接收并转换为电信号，实现时域信息的采集和记录，以获得第一路信号各个空间点位置的时域信息。
在一个实施例中，上述时间透镜时频变换光路包括第三单模光纤、第二泵浦脉冲光源、第四单模光纤、第二高非线性光纤、第二光学滤波器和第二色散补偿光纤；
第三单模光纤对第二路信号施加第四色散处理，形成第二探测光；第二泵浦脉冲光源产生超短脉冲序列作为第二泵浦脉冲；第四单模光纤对第二泵浦脉冲施加第五色散处理，形成第二泵浦光；第二高非线性光纤为第二探测光和第二泵浦光之间的非线性参量过程提供非线性媒介；第二光学滤波器将非线性参 量过程产生的第二闲频光滤出；第二色散补偿光纤压缩第二闲频光，得到时间透镜时频变换处理后的信号(即第一频域信息对应的初始频域信息)。
上述第二光学滤波器可以为光纤型带通滤波器或波分复用器，在时间透镜时频变换光路中用于将非线性参量过程产生的闲频光滤出，以保证滤出效果。
上述第三单模光纤的色散量Φ
in也可以称为时间透镜时频变换光路的“物距”。第二泵浦脉冲光源、第四单模光纤、第二高非线性光纤和第二光学滤波器共同协作，可以实现对第四色散处理得到的光场信号(第二探测光)的周期性二次相位调制
实现时间透镜功能，时间透镜的“焦距”为Φ
f，即第二色散补偿光纤的色散量。具体地，时间透镜时频变换处理过程中，周期性二次相位调制的方法可以是电光型相位调制器或是基于啁啾脉冲序列的光参量频率转换过程。上述第二色散补偿光纤的色散量Φ
out也可以称为时间透镜时频变换光路的“像距”。
作为一个实施例，上述第三单模光纤的色散量、第四单模光纤的色散参数和第二色散补偿光纤的色散量，满足如下关系式：
Φ
in＝Φ
out＝Φ
f，
式中，Φ
in表示第三单模光纤的色散量，Φ
out表示第二色散补偿光纤的色散量，Φ
f表示第四单模光纤的色散参数，相应地，2Φ
f表示第四单模光纤的色散量。
本实施例可以对第二路信号进行更为精准地时间透镜时频变换处理，进而保证了所获得的第一频域信息的准确性。
在一个示例中，第二路信号进入高刷新率时间透镜时频变换光路中，其中连续光部分的频域测量过程可以类比为空间透镜2-f系统中的傅里叶变换过程，光场中连续光成分在时间透镜后的像可以表示为：
式中，矩形函数
描述了作为等效透镜的时域脉冲，ω
p表示泵浦频率，ω
s表示信号光频率，2Φ
f表示高刷新率时间透镜光路中的泵浦端色散量，符号“∝”表示正比于，i表示虚数单位，A
cw(t)表示连续光部分的光场表达式，E
TL(t)表示连续光部分在时间透镜后的像。经过输出端色散后在像面上实现时频傅里叶变换，如下式所示：
式中，ET
LS(t)为经高刷新率时间透镜光路输出的光场表达式，2Φ
f和Φ
out分别为高刷新率时间透镜光路中泵浦端和输出端色散量大小，符号
表示傅里叶变换，符号
表示傅里叶逆变换，δω＝2ω
p-ω
s，sinc函数的变量δω携带了连续光频率ω
s的信息，且在满足条件2Φ
outΔΩ
P＜T
R下，其中，ΔΩ
P表示时间透镜时频变换光路中泵浦脉冲的光谱带宽，T
R表示泵浦脉冲的脉冲间隔时间，不会出现时间拉伸时频变换光路中的时域信号交叠问题。超快光场信号经过高刷新率时间透镜时频变换光路后由高速光电探测阵列转换为电信号，实现其连续光部分频域信息的采集和记录，以获得第二路信号连续光部分的第一频域信息。
在一个示例中，第三路信号进入时域拉伸色散部件，经过时间拉伸后待测超快光场完成时频傅里叶变换。基于时空对应原理，在满足夫琅禾费衍射的近 似条件下输出信号强度I
TSS(t)可以表达为：
其中，A
p(ω)为第三路信号脉冲光部分光场在频域上的表达式，Φ
TS表示时域拉伸色散部件的色散量大小，i表示虚数单位，t表示时间变量，ω表示频率变量。在高光谱分辨率频域测量中，时间拉伸时频变换后会出现时域信号交叠的问题。本示例提出利用光谱分光的方法解耦输出端时域交叠信号，经时域拉伸色散部件输出的时域光场通过第二光谱分光部件得到解耦后的强度信号，如下式所示：
其中，H(ω-ω
0)为频谱响应函数，ω
0为中心频率。从上式可以看出，时间变量t与频率变量ω为一一对应关系，经过时域拉伸时频变换后的光场信号与光谱分光部件作用后会直接映射到时刻t＝ω
0Φ
TS下的时域信号，光场经光谱分光部件后由高速光电探测阵列转换为电信号，实现其脉冲光部分频域信息的采集和记录，以获得第三路信号中脉冲光部分的第二频域信息。
参考图2所示，在一个实施例中，上述超快光场的信息实时测量系统还包括同步参考脉冲源41、光学分路部件42和融合终端43；
同步参考脉冲源41产生同步参考脉冲信号；光学分路部件42将合束后的超快光场信号和同步参考脉冲信号分为第一路信号、第二路信号和第三路信号；
融合终端43读取时域信息、第一频域信息和第二频域信息分别包含的同步 参考脉冲信号，将时域信息、第一频域信息和第二频域信息中的任意两个信息分别对准第三个信息，在时域信息、第一频域信息和第二频域信息对准之后，融合时域信息、第一频域信息和第二频域信息，得到融合信息。
上述融合终端43为具有接收各类信号，对相应信号进行对准、融合等处理功能的智能终端。融合终端43可以读取时域信息、第一频域信息和第二频域信息分别包含的同步参考脉冲信号，将时域信息、第一频域信息和第二频域信息中的任意两个信息分别对准时域信息、第一频域信息和第二频域信息中除上述两个信息之外的第三个信息，以实现时域信息、第一频域信息和第二频域信息三者地对准。融合终端43在对准时域信息、第一频域信息和第二频域信息之前，可以将上述时域信息、第一频域信息和第二频域信息分别转换为相应的数字化信号，再进行三者的对准，以保证对准结果的准确性。上述同步参考脉冲源41产生的同步参考脉冲信号可以携带对准标记，融合终端43读取时域信息、第一频域信息和第二频域信息携带的对准标记，将时域信息、第一频域信息和第二频域信息中的任意两个信息分别对准第三个信息，以提高相应的对准效率。融合终端43在时域信息、第一频域信息和第二频域信息对准之后，融合时域信息、第一频域信息和第二频域信息，使得到的融合信息可以包括超快光场信号的时域信息、空域信息和频域信息，具有较高的完整性。
作为一个实施例，上述超快光场的信息实时测量系统还包括模数转换器；
上述模数转换器将时域信息、第一频域信息和第二频域信息分别转换为相应的数字化信号，并将转换得到的各个数字化信号输入融合终端，以使融合终端针对时域信息、第一频域信息和第二频域信息分别对应的数字化信号进行对准、融合等处理，保证相关处理过程的准确性。
上述模数转换器为高速电模数转换器，以保证相应数字化转换过程中的效 率，使所得到的数字化信号更易于被采集或者读取，便于进行相关后端数据处理。
作为一个实施例，上述同步参考脉冲源为皮秒脉冲激光器或飞秒脉冲激光器；其产生的同步参考脉冲信号更为稳定，能够有效保证后续融合终端进行时域信息、第一频域信息和第二频域信息对准工作的准确性。
作为一个实施例，上述同步参考脉冲源的脉冲重复频率低于时间透镜时频变换光路中的脉冲光源频率；以弱化第二路信号携带的同步参考脉冲信号在时间透镜时频变换光路进行时间透镜时频变换处理过程所造成的干扰。
作为一个实施例，上述光学分路部件为光纤型耦合器，以对合束后的超快光场信号和同步参考脉冲信号进行准确分路，得到第一路信号、第二路信号和第三路信号。
在一个示例中，在进行时域信息、第一频域信息和第二频域信息对准、融合等数据重构时，以同步参考脉冲信号为依据对各路采集信号的时间轴进行校正，获得统一时间轴下的时频信息。基于广义投影法反演光场的相位信息，在假设初始相位的情况下通过如下迭代关系重构超快光场的相位信息：
其中I
M(t)和
分别为时域和频域的测量样本，u
t1(t)为广义投影法中迭代步骤1中的光场时域表达式，φ
0(t)为迭代步骤4中光场u
t0(t)的相位表达式，u
ω0(ω)为迭代步骤2中根据u
t1(t)得到的光场频域表达式，u
ω1(ω)为迭代步骤3中根据频域测量样本和u
ω0(ω)的相位信息得到的频域表达式，以此进行数据重构， 可以实现针对超快光场信号时频信息的实时超快测量。
参考图3所示，在一个实施例中，上述超快光场的信息实时测量系统还包括单频激光光源14；
单频激光光源14产生单频激光信号；单频激光信号用于与第一路信号合束；连续级联式时间透镜光路11将合束后的信号进行时域放大，得到时域放大信号。
具体地，可以将单频激光光源14通过干涉的方法将时空域相位信息加载到第一路信号的强度信息上，实现第一路信号与单频激光信号的合束，使第一路信号与单频激光信号相干形成调制信号，通过对该调制信号的解调处理可以还原初始信号的幅度和相位信息。
在一个示例中，时间长度为5ns的待测信号其时域相对强度如图4所示，通过现有测量系统和本发明提供的测量系统分别进行超快光场信息测量的仿真结果对比图可以参考图5所示，从图5中可以看出现有测量系统的记录时间长度有限，得到的为非时域连续的测量结果，而本发明的测量系统可以完整地采集到待测信号的时域信息。
在一个具体的示例中，分别采用现有测量系统和本发明测量系统对时间长度为9ns的待测信号进行测试。通过现有测量系统后的仿真结果如图6所示，从图6中可以看出测得的结果其光谱分辨率低，且不具备识别待测信号中连续光部分的能力。通过本发明测量系统后的仿真结果如图7所示，与图6中的结果对比可以看出，本发明测量系统具备辨别超快光场中连续光部分的能力，同时测量刷新率达到1GHz。实验中，利用本发明的测量系统测得的超快光场的时域和频域信息，可以得到皮秒脉冲在时域上的幅度和相位信息，如图8所示。
上述超快光场的信息实时测量系统通过连续级联式时间透镜光路获得了包含所有细节的放大的时域光场信号，经光谱分光解耦信号时域交叠后由高速光 电探测阵列实现时域信号波形的实时测量；同时利用时间透镜光路和时域拉伸色散部件分别完成对光场连续光部分和脉冲光部分的时频傅里叶变换，经光谱分光解耦信号交叠后配合高速光电探测阵列实现高刷新率频域信息实时测量，采用参考脉冲源同步、校准各路信号并利用反演算法融合时频信息，最终达到高刷新率(刷新率大于1GHz)，高时、频分辨率(时间分辨率可达约50fs，光谱分辨率可达约1pm)的超快光场时频信息的实时超快测量。
以上实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
需要说明的是，本申请实施例所涉及的术语“第一\第二\第三”仅仅是区别类似的对象，不代表针对对象的特定排序，可以理解地，“第一\第二\第三”在允许的情况下可以互换特定的顺序或先后次序。应该理解“第一\第二\第三”区分的对象在适当情况下可以互换，以使这里描述的本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。
本申请实施例的术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或模块的过程、方法、装置、产品或设备没有限定于已列出的步骤或模块，而是可选地还包括没有列出的步骤或模块，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或模块。
在本文中提及的“多个”是指两个或两个以上。“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细， 但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。
Claims (10)
- 一种超快光场的信息实时测量系统，其特征在于，包括：连续级联式时间透镜光路、第一光谱分光部件、第一光电探测阵列、时间透镜时频变换光路、第二光电探测阵列、时域拉伸单模光纤、第二光谱分光部件和第三光电探测阵列；所述连续级联式时间透镜光路将第一路信号进行时域放大，得到时域放大信号；所述第一光谱分光部件在所述时域放大信号的各个空间点位置进行光谱分光；所述第一光电探测阵列将光谱分光后的多路信号转换为电信号，得到所述第一路信号各个空间点位置的时域信息；所述时间透镜时频变换光路对第二路信号进行时间透镜时频变换处理；所述第二光电探测阵列将时间透镜时频变换处理后的信号中各个空间点位置处的光信号转变为电信号，得到所述第二路信号连续光部分的第一频域信息；所述时域拉伸单模光纤对第三路信号进行时域拉伸，实现傅里叶变换，得到时频变换光谱；所述第二光谱分光部件对所述时频变换光谱进行光谱分光，得到解耦时域交叠信息；所述第三光电探测阵列对所述解耦时域交叠信息进行光电转换，得到所述第三路信号脉冲光部分的第二频域信息；所述第一路信号、所述第二路信号和所述第三路信号为待测的超快光场信号分路得到的三路信号。
- 根据权利要求1所述的系统，其特征在于，所述连续级联式时间透镜光路包括第一单模光纤、第一泵浦脉冲光源、第二单模光纤、第一高非线性光纤、第一光学滤波器和第一色散补偿光纤；所述第一单模光纤对所述第一路信号进行第一色散处理，形成第一探测光； 所述第一泵浦脉冲光源产生超短脉冲序列作为第一泵浦脉冲；所述第二单模光纤对第一泵浦脉冲施加第二色散处理，形成第一泵浦光；所述第一高非线性光纤为第一探测光和第一泵浦光之间的非线性参量过程提供非线性媒介；所述第一光学滤波器将非线性参量过程产生的第一闲频光滤出；所述第一色散补偿光纤对所述第一闲频光进行第三色散处理，得到所述时域放大信号。
- 根据权利要求2所述的系统，其特征在于，所述第一单模光纤的色散量、所述第二单模光纤的色散参数和所述第一色散补偿光纤的色散量满足如下成像关系式：
式中，D in表示第一单模光纤的色散量，D out表示第一色散补偿光纤的色散量，D f表示第二单模光纤的色散参数；所述第一路信号的时域放大倍数M为：
- 根据权利要求2所述的系统，其特征在于，所述第一泵浦脉冲光源的光谱带宽、所述第一泵浦脉冲光源的重复频率和所述第二单模光纤的色散参数，满足如下关系式：
式中，Ω表示第一泵浦脉冲光源的光谱带宽，D f表示第二单模光纤的色散参数，f p表示第一泵浦脉冲光源的重复频率。 - 根据权利要求1所述的系统，其特征在于，所述时间透镜时频变换光路包括第三单模光纤、第二泵浦脉冲光源、第四单模光纤、第二高非线性光纤、第二光学滤波器和第二色散补偿光纤；所述第三单模光纤对所述第二路信号施加第四色散处理，形成第二探测光； 所述第二泵浦脉冲光源产生超短脉冲序列作为第二泵浦脉冲；所述第四单模光纤对所述第二泵浦脉冲施加第五色散处理，形成第二泵浦光；所述第二高非线性光纤为第二探测光和第二泵浦光之间的非线性参量过程提供非线性媒介；所述第二光学滤波器将非线性参量过程产生的第二闲频光滤出；所述第二色散补偿光纤压缩第二闲频光，得到时间透镜时频变换处理后的信号。
- 根据权利要求5所述的系统，其特征在于，所述第三单模光纤的色散量、所述第四单模光纤的色散参数和所述第二色散补偿光纤的色散量，满足如下关系式：Φ in＝Φ out＝Φ f，式中，Φ in表示第三单模光纤的色散量，Φ out表示第二色散补偿光纤的色散量，Φ f表示第四单模光纤的色散参数。
- 根据权利要求1至6任一项所述的系统，其特征在于，还包括同步参考脉冲源、光学分路部件和融合终端；所述同步参考脉冲源产生同步参考脉冲信号；所述光学分路部件将合束后的所述超快光场信号和所述同步参考脉冲信号分为所述第一路信号、所述第二路信号和所述第三路信号；所述融合终端读取所述时域信息、所述第一频域信息和所述第二频域信息分别包含的同步参考脉冲信号，将所述时域信息、所述第一频域信息和所述第二频域信息中的任意两个信息分别对准第三个信息，在所述时域信息、所述第一频域信息和所述第二频域信息对准之后，融合所述时域信息、所述第一频域信息和所述第二频域信息，得到融合信息。
- 根据权利要求7所述的系统，其特征在于，还包括模数转换器；所述模数转换器将所述时域信息、所述第一频域信息和所述第二频域信息 分别转换为相应的数字化信号，并将转换得到的各个数字化信号输入所述融合终端。
- 根据权利要求7所述的系统，其特征在于，所述同步参考脉冲源为皮秒脉冲激光器或飞秒脉冲激光器；和/或，所述同步参考脉冲源的脉冲重复频率低于所述时间透镜时频变换光路中的脉冲光源频率；和/或，所述光学分路部件为光纤型耦合器。
- 根据权利要求1至6任一项所述的系统，其特征在于，还包括单频激光光源；所述单频激光光源产生单频激光信号；所述单频激光信号用于与所述第一路信号合束；所述连续级联式时间透镜光路将合束后的信号进行时域放大，得到所述时域放大信号。
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910409566.2A CN110186577B (zh) | 2019-05-17 | 2019-05-17 | 超快光场的信息实时测量系统 |
| CN201910409566.2 | 2019-05-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2020232790A1 true WO2020232790A1 (zh) | 2020-11-26 |
Family
ID=67716462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2019/092426 WO2020232790A1 (zh) | 2019-05-17 | 2019-06-21 | 超快光场的信息实时测量系统 |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110186577B (zh) |
| WO (1) | WO2020232790A1 (zh) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113837980A (zh) * | 2021-10-12 | 2021-12-24 | Oppo广东移动通信有限公司 | 分辨率的调整方法、装置、电子设备及存储介质 |
| CN113900316A (zh) * | 2021-10-12 | 2022-01-07 | 浙江工业大学 | 一种基于时间透镜的高性能电采样系统及方法 |
| CN113959969A (zh) * | 2021-09-29 | 2022-01-21 | 华东师范大学重庆研究院 | 一种高分辨超灵敏的时间拉伸红外高光谱成像技术 |
| CN114136467A (zh) * | 2021-11-26 | 2022-03-04 | 深圳大学 | 一种1-1.7μm波段超快激光的实时脉冲测量系统和方法 |
| CN115165106A (zh) * | 2022-06-20 | 2022-10-11 | 华中科技大学 | 超快光谱强度和相位信息测量方法及装置 |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110186578B (zh) * | 2019-05-17 | 2020-01-21 | 华南理工大学 | 超快光场的三域信息获取方法和系统 |
| CN111474803A (zh) * | 2020-04-03 | 2020-07-31 | 浙江工业大学 | 一种基于时间透镜成像的全光异或光逻辑门运算系统 |
| CN111442851B (zh) * | 2020-04-13 | 2021-01-29 | 重庆大学 | 基于拉曼孤子自频移的时间透镜测量系统 |
| CN111693159B (zh) * | 2020-05-30 | 2021-09-21 | 华南理工大学 | 基于时频复用的大带宽超快脉冲实时时域测量方法和系统 |
| CN111678611B (zh) * | 2020-05-30 | 2021-11-23 | 华南理工大学 | 基于高重复频率飞秒脉冲全场信息实时测量系统和方法 |
| CN111693157B (zh) * | 2020-05-30 | 2021-09-21 | 华南理工大学 | 基于时频复用的大泵浦带宽超快脉冲时域测量方法和系统 |
| CN111595470B (zh) * | 2020-05-30 | 2021-05-14 | 华南理工大学 | 一种智能高重复频率飞秒脉冲实时全场测量方法和系统 |
| CN111693143B (zh) * | 2020-05-30 | 2021-09-21 | 华南理工大学 | 一种具有大动态范围的实时脉冲激光光谱测量方法和系统 |
| CN111693158B (zh) * | 2020-05-31 | 2021-12-21 | 华南理工大学 | 基于波分解复用的高重频超快脉冲时域探测方法和系统 |
| CN111693160B (zh) * | 2020-05-31 | 2021-09-21 | 华南理工大学 | 基于时间解复用的高重频超快脉冲时域探测方法和系统 |
| CN113834574B (zh) * | 2021-08-30 | 2022-09-16 | 北京邮电大学 | 超短光脉冲测量系统和方法 |
| CN114001835B (zh) * | 2021-11-01 | 2024-02-13 | 深圳大学 | 一种超短脉冲的实时光谱测量系统和方法 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858566A (zh) * | 2006-06-09 | 2006-11-08 | 中国科学院上海光学精密机械研究所 | 超短脉冲精确实时测量装置 |
| WO2008002622A2 (en) * | 2006-06-27 | 2008-01-03 | The Regents Of The University Of California | Ultrafast chirped optical waveform recorder using referenced heterodyning and a time microscope |
| CN102388298A (zh) * | 2009-02-05 | 2012-03-21 | 康奈尔大学 | 通过使用四波混频进行时间展宽的高速光采样 |
| WO2013171155A1 (de) * | 2012-05-14 | 2013-11-21 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | ZEITLINSENAUFBAU MIT VARIABLER VERGRÖßERUNG |
| CN107219002A (zh) * | 2017-04-19 | 2017-09-29 | 华中科技大学 | 一种超高分辨率光谱测量方法及系统 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100587420C (zh) * | 2007-03-16 | 2010-02-03 | 电子科技大学 | 一种激光光谱测量方法 |
| CN102353465B (zh) * | 2011-09-30 | 2012-12-19 | 湖南大学 | 超短脉冲不同空间位置的时间脉宽测量系统及其测量方法 |
| CN104460177B (zh) * | 2014-12-12 | 2017-06-23 | 浙江工业大学 | 一种时间透镜成像系统 |
| CN105806495A (zh) * | 2016-03-14 | 2016-07-27 | 华中科技大学 | 超快脉冲的全光场实时测量系统及方法 |
-
2019
- 2019-05-17 CN CN201910409566.2A patent/CN110186577B/zh active Active
- 2019-06-21 WO PCT/CN2019/092426 patent/WO2020232790A1/zh active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858566A (zh) * | 2006-06-09 | 2006-11-08 | 中国科学院上海光学精密机械研究所 | 超短脉冲精确实时测量装置 |
| WO2008002622A2 (en) * | 2006-06-27 | 2008-01-03 | The Regents Of The University Of California | Ultrafast chirped optical waveform recorder using referenced heterodyning and a time microscope |
| CN102388298A (zh) * | 2009-02-05 | 2012-03-21 | 康奈尔大学 | 通过使用四波混频进行时间展宽的高速光采样 |
| WO2013171155A1 (de) * | 2012-05-14 | 2013-11-21 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | ZEITLINSENAUFBAU MIT VARIABLER VERGRÖßERUNG |
| CN107219002A (zh) * | 2017-04-19 | 2017-09-29 | 华中科技大学 | 一种超高分辨率光谱测量方法及系统 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113959969A (zh) * | 2021-09-29 | 2022-01-21 | 华东师范大学重庆研究院 | 一种高分辨超灵敏的时间拉伸红外高光谱成像技术 |
| CN113959969B (zh) * | 2021-09-29 | 2024-02-13 | 华东师范大学重庆研究院 | 一种高分辨超灵敏的时间拉伸红外高光谱成像技术 |
| CN113837980A (zh) * | 2021-10-12 | 2021-12-24 | Oppo广东移动通信有限公司 | 分辨率的调整方法、装置、电子设备及存储介质 |
| CN113900316A (zh) * | 2021-10-12 | 2022-01-07 | 浙江工业大学 | 一种基于时间透镜的高性能电采样系统及方法 |
| CN114136467A (zh) * | 2021-11-26 | 2022-03-04 | 深圳大学 | 一种1-1.7μm波段超快激光的实时脉冲测量系统和方法 |
| CN115165106A (zh) * | 2022-06-20 | 2022-10-11 | 华中科技大学 | 超快光谱强度和相位信息测量方法及装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110186577A (zh) | 2019-08-30 |
| CN110186577B (zh) | 2020-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020232790A1 (zh) | 超快光场的信息实时测量系统 | |
| US9291509B2 (en) | High-speed optical sampling by temporal stretching using four-wave mixing | |
| US7738111B2 (en) | Ultrafast chirped optical waveform recording using referenced heterodyning and a time microscope | |
| Bowlan et al. | Crossed-beam spectral interferometry: a simple, high-spectral-resolution method for completely characterizing complex ultrashort pulses in real time | |
| US6456380B1 (en) | Method and apparatus for measuring waveform of optical signal | |
| WO2020232787A1 (zh) | 超快光场的频域信息获取方法和系统 | |
| CN110832295B (zh) | 实时光学光谱-时间分析仪和方法 | |
| WO2020232788A1 (zh) | 超快光场的三域信息获取方法和系统 | |
| US9013705B2 (en) | Ultrafast chirped optical waveform recorder using a time microscope | |
| US11143558B2 (en) | Method and system for measuring transient time width of ultrashort pulse | |
| Hernandez et al. | 104 MHz rate single-shot recording with subpicosecond resolution using temporal imaging | |
| Cuadrado-Laborde et al. | Phase recovery by using optical fiber dispersion and pulse pre-stretching | |
| Dorrer et al. | Linear self-referencing techniques for short-optical-pulse characterization | |
| FR2774762A1 (fr) | Procede et dispositif pour mesurer le spectre complexe (amplitude et phase) d'impulsions optiques | |
| WO2020232789A1 (zh) | 超快光场的时空信息获取方法和系统 | |
| JP3378530B2 (ja) | 光信号電界の時間波形測定方法及び装置 | |
| Supradeepa et al. | Single shot amplitude and phase characterization of optical arbitrary waveforms | |
| US20040257578A1 (en) | Optical pulse characterization for telecommunications applications | |
| Fontaine et al. | Near quantum-limited, single-shot coherent arbitrary optical waveform measurements | |
| Dorrer et al. | High-sensitivity high-resolution sampling using linear optics and waveguide optical hybrid | |
| Crockett et al. | Capturing ultra-broadband complex-fields of arbitrary duration using a real-time spectrogram | |
| KR100337646B1 (ko) | 광 펄스 파형 측정 장치 | |
| Yang et al. | Direct spectral phase retrieval of ultrashort pulses by double modified one-dimensional autocorrelation traces | |
| US20240097782A1 (en) | Method and system for generating the spectrogram of a signal | |
| CN115165106B (zh) | 超快光谱强度和相位信息测量方法及装置 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 19929782 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 19929782 Country of ref document: EP Kind code of ref document: A1 |
|
| 32PN | Ep: public notification in the ep bulletin as address of the adressee cannot be established |
Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 19/05/2022) |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 19929782 Country of ref document: EP Kind code of ref document: A1 |