CN116087156B - Degenerate pumping detection device with high signal-to-noise ratio - Google Patents
Degenerate pumping detection device with high signal-to-noise ratio Download PDFInfo
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Abstract
The invention belongs to the field of ultrafast dynamics, and is used for solving the problem of low signal-to-noise ratio of the existing degenerate pump detection device, in particular to a degenerate pump detection device with high signal-to-noise ratio, which comprises a laser beam splitting component, a pump light adjusting component, a probe light adjusting component, a beam splitter, a dichroic mirror, a focusing lens, a three-dimensional objective table, a microscopic imaging device, a detection and data analysis device and a processor, wherein the laser beam splitting component is used for adjusting the pump light; the laser beam splitting assembly comprises a laser, a first half-wave plate and a polarization beam splitting prism, wherein the laser is used for outputting femtosecond laser, the laser output by the laser passes through the first half-wave plate, the polarization direction of the laser output is adjusted through the first half-wave plate, and the first half-wave plate is matched with the polarization beam splitting prism to adjust the light intensity ratio of pump light and detection light; the invention skillfully introduces the beam splitter, ensures that the pump light and the detection light are separated to the greatest extent in space, and eliminates the adverse effect on the test caused by low filtering rate of the polarizer on the pump light.
Description
Technical Field
The invention belongs to the field of ultrafast dynamics, and particularly relates to a degenerate pumping detection device with high signal-to-noise ratio.
Background
As the size of semiconductor devices is continuously reduced, micron-sized materials are receiving more and more attention, and are widely applied to the fields of photonics, photoelectric devices and the like; the study of the photogenerated carrier dynamics of materials is the basis for designing and optimizing their optics. The pumping detection technology utilizes the ultra-short pulse characteristic of the femtosecond laser, realizes the split sampling of time by controlling the optical path difference of the pumping light and the detection light, has the time resolution of subpicosecond or even femtosecond level, and is an ideal tool for researching the dynamics of carriers.
For micro-scale material, the problem of separation of pump light and detection light with the same wavelength is always a difficulty of degenerate pump detection, the prior degenerate pump detection device adjusts the polarization directions of the incident pump light and the detection light to be mutually perpendicular through a polaroid, the two paths of light beams are collinearly focused on a sample, and then the polaroid is used for filtering the pump light, and the signal to noise ratio of the system test is lower because the filtering rate of the polaroid to the pump light is not high; at present, a degenerate pump detection device meeting the requirements of micro-area measurement and high signal to noise ratio is needed to be provided.
Aiming at the technical problems, the application provides a degenerate pumping detection device with high signal-to-noise ratio.
Disclosure of Invention
The invention aims to provide a degenerate pumping detection device with high signal-to-noise ratio, which is used for solving the problem of low signal-to-noise ratio of the existing degenerate pumping detection device;
the technical problems to be solved by the invention are as follows: how to provide a degenerate pump detection device with high signal-to-noise ratio.
The aim of the invention can be achieved by the following technical scheme:
a degenerated pumping detection device with high signal-to-noise ratio comprises a laser beam splitting component, a pumping light adjusting component, a detection light adjusting component, a beam splitter, a dichroic mirror, a focusing lens, a three-dimensional objective table, a microscopic imaging device, a detection and data analysis device and a processor;
the laser beam splitting assembly comprises a laser, a first half-wave plate and a polarization beam splitting prism, wherein the laser is used for outputting femtosecond laser, the laser output by the laser passes through the first half-wave plate, the polarization direction of the laser output is adjusted through the first half-wave plate, and the first half-wave plate is matched with the polarization beam splitting prism to adjust the light intensity ratio of pump light and detection light;
the pump light adjusting assembly comprises a first adjustable attenuator, a first reflecting mirror and a second reflecting mirror, wherein the first adjustable attenuator is used for adjusting the pump light beam power to meet different testing requirements, and the first reflecting mirror and the second reflecting mirror are used for adjusting the direction of the pump light beam;
the detection light adjusting component comprises a third reflector, a delay line, a second adjustable attenuator, a fourth reflector, a beam expander, a fifth reflector and a second half-wave plate, wherein the third reflector is matched with the delay line to adjust the optical path difference between the pump light and the detection light, the detection sample is excited by the pump light and then evolves along with time, the fourth reflector and the fifth reflector are used for changing the direction of the detection light beam, the beam expander expands the detection light beam, and the second half-wave plate is used for changing the polarization direction of the detection light so that the detection light and the pump light have the same or different polarization directions;
the processor is in communication connection with a stability analysis module, an optimization analysis module and a storage module.
As a preferred embodiment of the invention, the delay line consists of an electric control displacement table and a roof mirror, and the beam splitter is used for leading out returned detection light and pump light in a direction perpendicular to the original light beam;
the dichroic mirror is used for reflecting the pump light and the detection light and transmitting the imaging white light;
the three-dimensional object stage is used for carrying a sample to be tested and carrying out position movement on the test area to obtain multi-point data.
As a preferred embodiment of the invention, the focusing lens is used for focusing the pump beam and the probe beam to a preset position and a spot size, the reflecting mirror is adjusted to maximally space-separate the pump beam and the probe beam, the space-separation distance takes the clear aperture of the beam splitter and the focusing lens as a limit, so that two laser beams symmetrically enter the focusing lens with the optical axis of the focusing lens as a center, and return in the direction of a symmetrical light path after interacting with a sample to be detected.
As a preferred embodiment of the present invention, the microscopic imaging device includes an illumination imaging module for obtaining imaging information of a sample to be measured and an imaging lens group for adjusting magnification and positioning a region to be measured.
As a preferred embodiment of the present invention, the detecting and data analyzing device includes a chopper, a light barrier, a photodetector, a lock-in amplifier, and a computer; the chopper is connected with the photoelectric detector and the lock-in amplifier, the light barrier is used for shielding pumping light which is spatially separated from detection light, and the computer is used for imaging, laser and attenuator control and data processing.
As a preferred embodiment of the present invention, the stability analysis module is configured to analyze degenerate pump probe stability: marking the time length for degenerate pumping detection as detection time length, dividing the detection time length into a plurality of detection time periods, acquiring pulse data MC, frequency data PL and power data GL in the detection time length, and obtaining a stability coefficient WD of the detection time length by carrying out numerical calculation on the pulse data MC, the frequency data PL and the power data GL in the detection time length; the method comprises the steps of acquiring historical data of degenerate pump detection in a storage module, wherein the historical data comprise laser intensity values, stability coefficients WD and signal to noise ratios of the degenerate pump detection, dividing the maximum value and the minimum value of the laser intensity values into a plurality of intensity intervals, summing the stability coefficients WD of the degenerate pump detection in the intensity intervals to obtain the stability values of the intensity intervals, marking the intensity interval with the minimum value of the stability values as a standard interval of the degenerate pump detection, and sending the standard interval to the storage module for storage through a processor.
As a preferred embodiment of the present invention, the acquisition process of the pulse data MC in the detection duration includes: marking the maximum value of the femtosecond laser pulse value output by the laser in the detection period as the pulse height value of the detection period, and performing variance calculation on the pulse height values in all the detection periods to obtain pulse data MC; the acquisition process of the frequency data PL in the detection duration includes: marking the highest value of the laser frequency output by the laser in the detection period as the frequency high value of the detection period, and performing variance calculation on the frequency high values of all the detection periods to obtain frequency data PL; the acquisition process of the detection duration power data GL comprises the following steps: and marking the maximum value of the pump light power in the detection period as a power high value, and performing variance calculation on the power high values in all the detection periods to obtain power data GL.
As a preferred embodiment of the present invention, the optimization analysis module is configured to perform an optimization analysis on the detection parameters of degenerate pump detection: and marking the pump light power set value of the degenerate pump detection as a power set value, marking the modulation frequency set value of the degenerate pump detection as a frequency set value, carrying out parameter optimization on the degenerate pump detection, obtaining a parameter standard range, and sending the parameter standard range to a storage module for storage through a processor.
As a preferred embodiment of the present invention, the specific process of parameter optimization for degenerate pump detection comprises: sorting degenerate pump detection processes according to the sequence of the signal to noise ratio values from large to small, removing L1 degenerate pump detections which are sorted in front, performing variance calculation on the signal to noise ratios of the rest degenerate pump detections to obtain signal wave values, acquiring signal wave threshold values through a storage module, and comparing the signal wave values with the signal wave threshold values:
if the signal wave value is smaller than the Yu Xinbo threshold value, marking the rejected degenerate pump detection as a standard test process;
if the signal wave value is greater than or equal to the signal wave threshold value, detecting and eliminating the degenerate pump with the forefront rest sequencing, recalculating the signal wave value, and comparing the recalculated signal wave value with the signal wave threshold value until the signal wave value is smaller than the Yu Xinbo threshold value;
the maximum value and the minimum value of the power setting value in the standard test process form a power range, the maximum value and the minimum value of the frequency setting value in the standard test process form a radio frequency range, and the power range and the radio frequency range form a parameter standard range.
The invention has the following beneficial effects:
the invention skillfully introduces the beam splitter, ensures that the pump light and the detection light are separated to the greatest extent in space, and eliminates the adverse effect on the test caused by low filtering rate of the polarizer on the pump light; meanwhile, a beam expander is introduced into one beam of detection light, so that the focused pumping light spot completely covers the detection light spot, and the test signal-to-noise ratio is further improved; in addition, the device is provided with two paths of online adjustable attenuators, and half wave plates are introduced into one path of detection light to provide polarization and power adjustment dimensions, so that technical support is provided for researching ultra-fast carrier dynamics of various micro-area materials with micron-scale sizes;
according to the invention, the stability of the degenerate pump detection process can be analyzed through the stability analysis module, the stability coefficient is obtained by carrying out numerical calculation on each parameter, and the stability state of each parameter of the degenerate pump detection process is fed back through the numerical value of the stability coefficient, so that the accuracy of the detection result of the degenerate pump detection process is ensured;
the detection parameters of degenerate pump detection can be set and optimized through the optimization analysis module, the parameter standard range is obtained through parameter optimization analysis, and parameters such as laser intensity, pump light power, modulation frequency and the like of degenerate pump detection are constrained by combining a standard interval, so that the accuracy of the result of degenerate pump detection is further improved.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
fig. 2 is a system block diagram of a second embodiment of the present invention.
In the figure: 1. a laser; 2. a first half-wave plate; 3. a polarization beam splitter prism; 4. a beam expander; 5. a first adjustable attenuator; 6. a first mirror; 7. a chopper; 8. a second mirror; 9. a beam splitter; 10. a dichroic mirror; 11. a focusing lens; 12. a sample to be tested; 13. a three-dimensional stage; 14. a third mirror; 15. a delay line; 16. a second adjustable attenuator; 17. a fourth mirror; 18. a fifth reflecting mirror; 19. a second half-wave plate; 20. a light barrier; 21. a photodetector; 22. an illumination imaging module; 23. an imaging lens group; 24. a phase-locked amplifier; 25. and a computer.
Description of the embodiments
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
As shown in FIG. 1, a degenerate pump detection device with high signal-to-noise ratio comprises a laser beam splitting component, a pump light adjusting component, a detection light adjusting component, a beam splitter 9, a dichroic mirror 10, a focusing lens 11, a three-dimensional objective table 13, a microscopic imaging device, a detection and data analysis device and a processor.
The laser beam splitting assembly comprises a laser 1, a first half wave plate 2 and a polarization beam splitting prism 3, wherein the laser 1 is a high-stability full polarization maintaining laser, femtosecond laser is output, the polarization direction of the output of the laser 1 is adjusted through the first half wave plate 2, and the laser beam splitting assembly is matched with the polarization beam splitting prism 3 to flexibly adjust the light intensity ratio of pump light and detection light.
The pump light adjusting component comprises a first adjustable attenuator 5, a first reflecting mirror 6 and a second reflecting mirror 8, wherein the first adjustable attenuator 5 is used for properly adjusting the pump light beam power so as to meet different testing requirements, and the first reflecting mirror 6 and the second reflecting mirror 8 are used for changing the direction of the pump light beam and ensuring complete parallelism with the probe light beam.
The probe light adjusting component comprises a third reflecting mirror 14, a delay line 15, a second adjustable attenuator 16, a fourth reflecting mirror 17, a beam expander 4, a fifth reflecting mirror 18 and a second half-wave plate 19, wherein the third reflecting mirror 14 is matched with the delay line 15 to adjust the optical path difference between the pump light and the probe light, the evolution process of the probe sample along with time after being excited by the pump light is carried out, the fourth reflecting mirror 17 and the fifth reflecting mirror 18 are used for changing the direction of the probe light and ensuring that the probe light is parallel to the pump light, the beam expander 4 expands the probe light, the focused probe light obtains smaller spot size, the pump light spot on the sample is ensured to completely cover the probe light spot, the signal to noise ratio of the system is further improved, the second half-wave plate 19 is used for changing the polarization direction of the probe light, the probe light and the pump light have the same or different polarization directions, and the characterization dimension of the degenerate pump probe device is further increased.
The delay line 15 consists of an electric control displacement table and a roof mirror, and realizes rapid and high-precision optical path difference adjustment.
The beam splitter 9 is used for leading out the returned detection light and pump light in a direction perpendicular to the original light beam, so that the detection light signal is conveniently collected.
The dichroic mirror 10 reflects the pump light and the probe light, transmits the imaging white light, and obtains a clear imaging effect under the condition that the light path is not moved.
The focusing lens 11 is used for focusing the pump beam and the probe beam to specific positions and spot sizes, and the reflecting mirror is adjusted to skillfully separate the pump beam and the probe beam to the greatest extent, the distance takes the clear aperture of the beam splitter 9 and the focusing lens 11 as a limit, so that two laser beams are ensured to symmetrically enter the focusing lens 11 with the optical axis of the focusing lens as the center, and return in the direction of a symmetrical light path after interacting with the sample 12 to be measured.
The three-dimensional object stage 13 is used for carrying the sample 12 to be tested and performing position movement on the test area to obtain multi-point data.
The microscopic imaging device comprises an illumination imaging module 22 and an imaging lens group 23, wherein the illumination imaging module 22 is used for obtaining imaging information of a sample to be detected, and the imaging lens group 23 is used for adjusting magnification factors so as to facilitate observation of samples with different sizes and positioning of a region to be detected.
The detection and data analysis device comprises a chopper 7, a light barrier 20, a photoelectric detector 21, a lock-in amplifier 24 and a computer 25; the chopper 7 is arranged on the pump light beam and is connected with the photoelectric detector 21 and the lock-in amplifier 24, and is used for receiving signals, filtering ambient background noise and improving the signal to noise ratio of signals to be detected, and the light barrier 20 is used for shielding the pump light spatially separated from the detection light, so that the pump light is prevented from acting on the photoelectric detector 21, and the overall signal to noise ratio is further improved; the computer 25 is used for imaging, laser and attenuator control, and data processing.
By introducing the beam splitter 9, the pump light and the detection light are ensured to be separated to the greatest extent in space, and the adverse effect on the test caused by low filtering rate of the polarizer on the pump light is eliminated; meanwhile, a beam of detection light is led into the beam expander 4, so that the focused pumping light spot completely covers the detection light spot, and the test signal-to-noise ratio is further improved; in addition, the device is provided with two paths of online adjustable attenuators, and half wave plates are introduced into one path of detection light, so that polarization and power adjustment dimensions are provided, and technical support is provided for researching ultra-fast carrier dynamics of various micro-area materials with micron-scale sizes.
Examples
As shown in fig. 2, the processor is in communication connection with a stability analysis module, an optimization analysis module and a storage module;
the stability analysis module is used for analyzing the degenerate pump detection stability: marking the time length for degenerate pumping detection as detection time length, dividing the detection time length into a plurality of detection time periods, and acquiring pulse data MC, frequency data PL and power data GL in the detection time length, wherein the acquisition process of the pulse data MC in the detection time length comprises the following steps: marking the maximum value of the femtosecond laser pulse value output by the laser 1 in the detection period as the pulse height value of the detection period, and performing variance calculation on the pulse height values in all the detection periods to obtain pulse data MC; the acquisition process of the frequency data PL in the detection duration includes: marking the highest value of the laser frequency output by the laser 1 in the detection period as the frequency high value of the detection period, and performing variance calculation on the frequency high values of all the detection periods to obtain frequency data PL; the acquisition process of the detection duration power data GL comprises the following steps: marking the maximum value of the pump light power in the detection period as a power high value, and performing variance calculation on the power high values in all the detection periods to obtain power data GL; obtaining a stability coefficient WD of the detection duration through a formula wd=α1mc+α2pl+α3gl, wherein α1, α2 and α3 are proportionality coefficients, and α1 > α2 > α3 > 1; the method comprises the steps of acquiring historical data of degenerate pump detection in a storage module, wherein the historical data comprise laser intensity values, stability coefficients WD and signal to noise ratios of the degenerate pump detection, dividing the maximum value and the minimum value of the laser intensity values into a plurality of intensity intervals, summing the stability coefficients WD of the degenerate pump detection in the intensity intervals to obtain the stability values of the intensity intervals, marking the intensity interval with the minimum value of the stability values as a standard interval of the degenerate pump detection, and sending the standard interval to the storage module for storage through a processor; and analyzing the stability of the degenerate pumping detection process, calculating the numerical value of each parameter to obtain a stability coefficient, and feeding back the stable state of each parameter of the degenerate pumping detection process according to the numerical value of the stability coefficient so as to ensure the accuracy of the detection result of the degenerate pumping detection process.
The optimization analysis module is used for carrying out optimization analysis on detection parameters of degenerate pump detection: marking a pump light power set value of degenerate pump detection as a power set value, marking a modulation frequency set value of degenerate pump detection as a frequency set value, and carrying out parameter optimization on degenerate pump detection: sorting the degenerate pump detection processes according to the sequence of the signal to noise ratio values from large to small, removing the L1 degenerate pump detections which are sorted in front, and performing variance calculation on the signal to noise ratio of the rest degenerate pump detections to obtain a signal wave value, wherein L1 is a constant value, and the value of L1 is set by a manager; the signal wave threshold value is obtained through the storage module, and the signal wave value is compared with the signal wave threshold value: if the signal wave value is smaller than the Yu Xinbo threshold value, marking the rejected degenerate pump detection as a standard test process; if the signal wave value is greater than or equal to the signal wave threshold value, detecting and eliminating the degenerate pump with the forefront rest sequencing, recalculating the signal wave value, and comparing the recalculated signal wave value with the signal wave threshold value until the signal wave value is smaller than the Yu Xinbo threshold value; the power range is formed by the maximum value of the power setting value and the minimum value of the power setting value in the standard test process, the radio frequency range is formed by the maximum value of the medium frequency setting value and the minimum value of the medium frequency setting value in the standard test process, the parameter standard range is formed by the power range and the radio frequency range, and the parameter standard range is sent to the storage module for storage through the processor; and setting and optimizing the detection parameters of the degenerate pump detection, obtaining a parameter standard range through parameter optimization analysis, and restricting the laser intensity, the pump light power, the modulation frequency and other parameters of the degenerate pump detection by combining a standard interval, thereby further improving the accuracy of the result of the degenerate pump detection.
The degenerate pump detection device with high signal-to-noise ratio is characterized in that when the degenerate pump detection device is in operation, a laser 1 outputs femtosecond laser, the output polarization direction of the laser is adjusted through a first half wave plate 2 and is matched with a polarization beam splitting prism 3, the light intensity ratio of pump light to detection light is flexibly adjusted, the power of the pump light beam can be properly adjusted by a first adjustable attenuator 5 so as to meet different test requirements, the direction of the pump light beam can be changed by a first reflecting mirror 6 and a second reflecting mirror 8, the complete parallelism with the detection light beam is ensured, the detection light beam is expanded by an expanding mirror 4, the smaller light spot size is obtained after focusing, the pump light spot on a sample is ensured to completely cover the detection light spot, and the signal-to-noise ratio of the system is further improved; the second half-wave plate 19 changes the polarization direction of the probe light so that the probe light and the pump light have the same or different polarization directions, thereby increasing the characterization dimension of the degenerate pump detection device.
The foregoing is merely illustrative of the structures of this invention and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the invention or from the scope of the invention as defined in the accompanying claims.
The formulas are all formulas obtained by collecting a large amount of data for software simulation and selecting a formula close to a true value, and coefficients in the formulas are set by a person skilled in the art according to actual conditions; such as: the formula wd=α1×mc+α2×pl+α3×gl; collecting a plurality of groups of sample data by a person skilled in the art and setting a corresponding stability coefficient for each group of sample data; substituting the set stability coefficient and the acquired sample data into a formula, forming a ternary one-time equation set by any three formulas, screening the calculated coefficient, and taking an average value to obtain values of alpha 1, alpha 2 and alpha 3 of 4.28, 3.15 and 2.36 respectively;
the size of the coefficient is a specific numerical value obtained by quantizing each parameter, so that the subsequent comparison is convenient, and the size of the coefficient depends on the number of sample data and the corresponding stability coefficient is preliminarily set for each group of sample data by a person skilled in the art; as long as the proportional relation between the parameter and the quantized value is not affected, for example, the stability factor is proportional to the value of the pulse data.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (6)
1. The degenerated pumping detection device with high signal-to-noise ratio is characterized by comprising a laser beam splitting component, a pumping light adjusting component, a detection light adjusting component, a beam splitter (9), a dichroic mirror (10), a focusing lens (11), a three-dimensional objective table (13), a microscopic imaging device, a detection and data analysis device and a processor;
the laser beam splitting assembly comprises a laser (1), a first half-wave plate (2) and a polarization beam splitting prism (3), wherein the laser (1) is used for outputting femtosecond laser, the laser output by the laser (1) passes through the first half-wave plate (2), the polarization direction of the output of the laser (1) is adjusted through the first half-wave plate (2), and the first half-wave plate (2) is matched with the polarization beam splitting prism (3) to adjust the light intensity ratio of pump light and detection light;
the pump light adjusting assembly comprises a first adjustable attenuator (5), a first reflecting mirror (6) and a second reflecting mirror (8), wherein the first adjustable attenuator (5) is used for adjusting the pump light beam power to meet different test requirements, and the first reflecting mirror (6) and the second reflecting mirror (8) are used for adjusting the direction of the pump light beam;
the detection light adjusting component comprises a third reflecting mirror (14), a delay line (15), a second adjustable attenuator (16), a fourth reflecting mirror (17), a beam expander (4), a fifth reflecting mirror (18) and a second half-wave plate (19), wherein the third reflecting mirror (14) is matched with the delay line (15) to adjust the optical path difference between the pump light and the detection light, the evolution process of the detection sample with time after being excited by the pump light is carried out, the fourth reflecting mirror (17) and the fifth reflecting mirror (18) are used for changing the direction of the detection light beam, the beam expander (4) expands the detection light beam, and the second half-wave plate (19) is used for changing the polarization direction of the detection light so that the detection light and the pump light have the same or different polarization directions;
the processor is in communication connection with a stability analysis module, an optimization analysis module and a storage module;
the focusing lens (11) is used for focusing the pumping light beam and the detecting light beam to a preset position and a light spot size, the pumping light beam and the detecting light beam are separated to the greatest extent through the adjusting reflector, the spatial separation distance takes the clear aperture of the beam splitter (9) and the focusing lens (11) as a limit, the two laser beams symmetrically enter the focusing lens (11) by taking the optical axis of the focusing lens (11) as the center, and return in the direction of a symmetrical light path after interacting with the sample (12) to be detected;
the stability analysis module is used for analyzing the degenerate pump detection stability: marking the time length for degenerate pumping detection as detection time length, dividing the detection time length into a plurality of detection time periods, acquiring pulse data MC, frequency data PL and power data GL in the detection time length, and obtaining a stability coefficient WD of the detection time length by carrying out numerical calculation on the pulse data MC, the frequency data PL and the power data GL in the detection time length; the method comprises the steps of acquiring historical data of degenerate pump detection in a storage module, wherein the historical data comprise laser intensity values, stability coefficients WD and signal to noise ratios of the degenerate pump detection, dividing the maximum value and the minimum value of the laser intensity values into a plurality of intensity intervals, summing the stability coefficients WD of the degenerate pump detection in the intensity intervals to obtain the stability values of the intensity intervals, marking the intensity interval with the minimum value of the stability values as a standard interval of the degenerate pump detection, and sending the standard interval to the storage module for storage through a processor;
the optimization analysis module is used for carrying out optimization analysis on detection parameters of degenerate pump detection: and marking the pump light power set value of the degenerate pump detection as a power set value, marking the modulation frequency set value of the degenerate pump detection as a frequency set value, carrying out parameter optimization on the degenerate pump detection, obtaining a parameter standard range, and sending the parameter standard range to a storage module for storage through a processor.
2. The degenerate pump detector of high signal-to-noise ratio as recited in claim 1, wherein the delay line (15) is comprised of an electronically controlled displacement stage and a roof mirror, and the beam splitter (9) is configured to direct the returned probe light and pump light in a direction perpendicular to the original beam;
the dichroic mirror (10) is used for reflecting the pump light and the detection light and transmitting the imaging white light;
the three-dimensional objective table (13) is used for bearing a sample (12) to be tested, and carrying out position movement on the test area to obtain multi-point data.
3. A degenerate pump detection arrangement with high signal-to-noise ratio according to claim 2, characterized in that the microscopic imaging arrangement comprises an illumination imaging module (22) and an imaging lens group (23), the illumination imaging module (22) being adapted to obtain imaging information of the sample (12) to be measured, the imaging lens group (23) being adapted to adjust the magnification and to position the area to be measured.
4. A high signal-to-noise ratio degenerate pump detection arrangement according to claim 3, characterized in that the detection and data analysis arrangement comprises a chopper (7), a light barrier (20), a photodetector (21), a lock-in amplifier (24) and a computer (25); the chopper (7) is connected with the photoelectric detector (21) and the lock-in amplifier (24), the light barrier (20) is used for shielding pumping light which is spatially separated from detection light, and the computer (25) is used for imaging, laser (1) and attenuator control and data processing.
5. The degenerate pump probe apparatus with high signal-to-noise ratio as recited in claim 4, wherein the acquisition process of the pulse data MC during the probe duration comprises: marking the maximum value of the femtosecond laser pulse value output by the laser (1) in the detection period as the pulse height value of the detection period, and performing variance calculation on the pulse height values in all the detection periods to obtain pulse data MC; the acquisition process of the frequency data PL in the detection duration includes: marking the highest value of the laser frequency output by the laser (1) in the detection period as the frequency high value of the detection period, and performing variance calculation on the frequency high values of all the detection periods to obtain frequency data PL; the acquisition process of the detection duration power data GL comprises the following steps: and marking the maximum value of the pump light power in the detection period as a power high value, and performing variance calculation on the power high values in all the detection periods to obtain power data GL.
6. The degenerate pump detection apparatus with high signal-to-noise ratio as recited in claim 5, wherein the specific process of parameter optimization for degenerate pump detection comprises: sorting degenerate pump detection processes according to the sequence of the signal to noise ratio values from large to small, removing L1 degenerate pump detections which are sorted in front, performing variance calculation on the signal to noise ratios of the rest degenerate pump detections to obtain signal wave values, acquiring signal wave threshold values through a storage module, and comparing the signal wave values with the signal wave threshold values:
if the signal wave value is smaller than the Yu Xinbo threshold value, marking the rejected degenerate pump detection as a standard test process;
if the signal wave value is greater than or equal to the signal wave threshold value, detecting and eliminating the degenerate pump with the forefront rest sequencing, recalculating the signal wave value, and comparing the recalculated signal wave value with the signal wave threshold value until the signal wave value is smaller than the Yu Xinbo threshold value;
the maximum value and the minimum value of the power setting value in the standard test process form a power range, the maximum value and the minimum value of the frequency setting value in the standard test process form a radio frequency range, and the power range and the radio frequency range form a parameter standard range.
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