CN111366544B - Double-beam non-collinear pumping-detecting system - Google Patents
Double-beam non-collinear pumping-detecting system Download PDFInfo
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- CN111366544B CN111366544B CN202010157064.8A CN202010157064A CN111366544B CN 111366544 B CN111366544 B CN 111366544B CN 202010157064 A CN202010157064 A CN 202010157064A CN 111366544 B CN111366544 B CN 111366544B
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- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000001228 spectrum Methods 0.000 claims abstract description 7
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 230000009977 dual effect Effects 0.000 claims abstract 4
- 238000006073 displacement reaction Methods 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000000523 sample Substances 0.000 abstract description 21
- 238000005259 measurement Methods 0.000 abstract description 3
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- 238000000926 separation method Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 4
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- 230000003993 interaction Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N2021/0106—General arrangement of respective parts
- G01N2021/0112—Apparatus in one mechanical, optical or electronic block
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Abstract
The invention discloses a double-beam non-collinear pumping-detecting system, which comprises a beam splitter, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a fifth reflecting mirror, a first concave reflecting mirror, a second concave reflecting mirror, a spectroscope, a diaphragm, a spectrometer, a computer, a convex lens and a CCD camera, wherein the beam splitter is arranged on the beam splitter; a dual beam non-collinear pump-probe system is assembled by the installation of these optics. The system has the advantages of compact structure, simple light path, convenient practical adjustment and high stability of light beam space superposition and time superposition. The system adopts a non-collinear configuration, realizes the spatial separation of the pumping and detection pulses and the sample after the action, can be used for the situation that the frequency spectrums of two beams overlap, changes the laser incidence mode before a beam splitter and can also be used for pumping-detection measurement of different colors.
Description
Technical Field
The invention belongs to the technical field of pumping-detecting equipment, and particularly relates to a double-beam non-collinear pumping-detecting system.
Background
In recent years, with the rapid development of laser technology, ultra-short pulse-based pump-probe technology has been widely used to resolve the kinetic processes of electrons in atomic molecules. The research not only innovates our knowledge of the physical process on the ultra-short time scale, but also has important significance for the control of the ultra-fast chemical reaction process and the synthesis of some molecular devices. Typically, the pump light is first applied to excite the sample, and the subsequent probe light is then used to detect changes in the sample. The time delay between the pumping and the detection of the two beams of light is adjustable, and the evolution of the system to be detected along with time can be reflected by the morphological change of the spectrum of the detection light.
In the current common pump-detection system, two beams of light adopt a collinear geometric configuration, and the configuration cannot be used for the situation that the frequency spectrums of the two beams of light overlap. In addition, the light path is complex, and the lens is too much to use, so that the light beam is unstable to propagate, and the actual measurement is interfered. Aberration is also introduced by the light beam passing through the lens, so that the interaction between the laser and the medium is influenced, and finally the accuracy of a conclusion obtained by the experiment is influenced.
Based on the above-mentioned problems, the present invention proposes a non-collinear geometry for separating the pump and probe pulses after interaction of the laser with the sample.
Disclosure of Invention
In view of the shortcomings identified in the background art, the present invention provides a dual-beam non-collinear pump-detection system, which aims to solve the problems of the prior art in the background art.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a double-beam non-collinear pumping-detecting system comprises a beam splitter, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a fifth reflecting mirror, a first concave reflecting mirror, a second concave reflecting mirror, a spectroscope, a diaphragm, a spectrometer, a computer, a convex lens and a CCD camera; the first reflecting mirror is fixed on an electric displacement table, and the electric displacement table is connected with a computer;
the beam splitter divides incident laser into pump light and detection light which are transmitted in parallel, a first reflector and a second reflector are arranged on a beam outgoing light path of the beam splitter, the pump light and the detection light are respectively emitted into the first reflector and the second reflector, a first concave reflector is vertically arranged on a reflected light path of the first reflector and the second reflector, a third reflector is arranged on a reflected light path of the first concave reflector, a sample to be detected is arranged on a reflected light path of the third reflector, a beam splitter is arranged on a beam light path of a beam transmitted after the beam acts on the sample to be detected, a fourth reflector is arranged on a transmitted light path of the beam splitter, a diaphragm is arranged on a reflected light path of the fourth reflector, pump light in the beam is blocked by the diaphragm, a second concave reflector is arranged on a detected light path of the diaphragm, a spectrometer is arranged on a reflected light path of the second concave reflector, and the spectrometer transmits a spectrum signal to a computer; the light beam emitting device is characterized in that a fifth reflecting mirror is arranged on a reflected light path of the spectroscope, a convex lens is arranged on a reflected light path of the fifth reflecting mirror, a CCD camera is arranged on a light beam emitting path after focusing of the convex lens, and the CCD camera is connected with a computer.
Preferably, the intensity of the outgoing beam of the beam splitter is adjustable, and the adjustment range is 0.1% -100%.
Preferably, the sample to be measured is placed under the third reflecting mirror, the spectroscope is arranged under the sample to be measured, the fourth reflecting mirror is arranged under the spectroscope, the diaphragm is arranged above the fourth reflecting mirror, and the second concave reflecting mirror is arranged above the diaphragm.
Preferably, the convex lens is disposed above the fifth reflecting mirror, and the CCD camera is disposed above the convex lens.
Preferably, the first mirror and the second mirror are square mirrors.
Preferably, two D-shaped mirrors are arranged in parallel on an incident light path of the beam splitter, and two pulses are respectively introduced into the beam splitter through the two D-shaped mirrors.
Preferably, a pulse shaping device is arranged in the incident light path of the D-shaped mirror.
Compared with the defects and shortcomings of the prior art, the invention has the following beneficial effects:
the dual-beam non-collinear pump-detection system provided by the invention has the advantages of compact structure, convenience in practical adjustment, and very simple experimental light path compared with the traditional collinear pump detection light path, and ensures the stability of spatial coincidence and time coincidence of light beams. The invention is based on the principle of reflection optics, avoids aberration introduced by light beams passing through the lens as much as possible, and ensures the stability of laser pulse phase. Meanwhile, the system is very flexible to use, and can be applied to a wider wavelength region by selecting a proper lens; the non-collinear configuration is adopted, so that the spatial separation of the pumping and detection pulses and the sample after the action is naturally realized, the method can be used for the situation that the frequency spectrums of two beams of light overlap, the laser incidence mode before a beam splitter is changed, and the method can also be used for pumping-detection measurement of different colors.
Drawings
Fig. 1 is a schematic diagram of a dual-beam non-collinear pump-detection system according to an embodiment of the present invention.
In the figure: 1. a beam splitter; 2. a first mirror; 3. a second mirror; 4. an electric displacement table; 5. a first concave mirror; 6. a third mirror; 7. a sample to be tested; 8. a beam splitter; 9. a fourth mirror; 10. a diaphragm; 11. a second concave mirror; 12. a spectrometer; 13. a computer; 14. a fifth reflecting mirror; 15. a convex lens; a CCD camera; 17. a first D-mirror; 18. a second D-shaped mirror.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a dual-beam non-collinear pump-detection system includes a beam splitter 1, a first mirror 2, a second mirror 3, a third mirror 6, a fourth mirror 9, a fifth mirror 14, a first concave mirror 5, a second concave mirror 11, a beam splitter 8, a diaphragm 10, a spectrometer 12, a computer 13, a convex lens 15, and a CCD camera 16. The first mirror 2 is fixed on the electric displacement table 4, the electric displacement table 4 is connected with the computer 13, and the computer 13 controls the electric displacement table 4 to horizontally move (the moving direction of the electric displacement table 4 is indicated by an arrow in fig. 1).
The beam splitter 1 emits light beams with adjustable intensity, the adjusting range is 0.1% -100%, the beam splitter 1 receives the light beams emitted by the laser, a first reflecting mirror 2 and a second reflecting mirror 3 are arranged in the horizontal direction of the light beams emitted by the beam splitter 1, the first reflecting mirror 2 and the second reflecting mirror 3 are square reflecting mirrors, incident laser beams are divided into pump light and detection light which are transmitted in parallel after passing through the beam splitter 1, the pump light and the detection light are respectively emitted into the first reflecting mirror 2 and the second reflecting mirror 3, a first concave reflecting mirror 5 is vertically arranged on the light paths of the reflected light of the first reflecting mirror 2 and the second reflecting mirror 3, the position of the first concave reflecting mirror 5 is lower than the position of the first reflecting mirror 2 and the position of the second reflecting mirror 3, the two light beams of the pump light and the detection light are respectively reflected by the first reflecting mirror 2 and the second reflecting mirror 3 and then are reflected into the first concave reflecting mirror 5, a third reflecting mirror 6 is arranged on the reflecting light path of the first concave reflecting mirror 5, and the light beams are focused by the first concave reflecting mirror 5 and then enter the third reflecting mirror 6; placing a sample 7 to be measured below the third reflector 6, arranging a spectroscope 8 below the sample 7 to be measured, arranging a fourth reflector 9 below the spectroscope 8, arranging a diaphragm 10 obliquely above the fourth reflector 9, and arranging a second concave reflector 11 obliquely above the diaphragm 10; the pump light and the detection light reflected by the third reflector 6 are converged on the sample 7 to be detected, the pump light and the detection light transmitted by the sample 7 to be detected after acting with the sample 8 to be detected are divided into transmitted light and reflected light by the spectroscope 8, and the reflection transmittance of the spectroscope 8 is 1:9, that is, 90% of the light beam is transmitted through the beam splitter 8 to be transmitted light, 10% of the light beam is reflected through the beam splitter 8 to be reflected light, the transmitted light is transmitted into the fourth reflector 9, and is reflected by the fourth reflector 9 and then transmitted into the diaphragm 10, wherein the pumping light in the transmitted light is blocked by the diaphragm 10, the detected light is focused through the diaphragm 10 by the second concave reflector 11 and then transmitted into the spectrometer 12, and the spectrometer 12 transmits the spectrum signal to the computer 13 for analysis and processing, so as to study the ultrafast dynamic evolution of the system to be tested. The fifth reflecting mirror 14 is arranged on the light path of the reflected light of the spectroscope 8, the convex lens 15 is arranged above the fifth reflecting mirror 14, the CCD camera 16 is arranged above the convex lens 15, the reflected light after passing through the spectroscope 8 is reflected by the fifth reflecting mirror 14 and then enters the convex lens 15, the light beam after being focused by the convex lens 15 enters the CCD camera 16, the CCD camera 16 collects the light spot signals of two light beams at the focus and transmits the light spot signals to the computer 13, the computer 13 collects the light spot signals of the two light beams in real time, the time and space coincidence of the two light beams at the focus can be represented by the interference fringe with the highest contrast collected by the CCD camera 16, the time and the space coincidence can be monitored by the computer 13 in real time in the experiment, and the stability of the experiment and the reliability of the result are ensured. Further, the computer 13 changes the time delay of the pump light to reach the sample 7 to be measured with respect to the probe light by controlling the horizontal movement of the electric displacement stage 4. The first reflecting mirror 2, the second reflecting mirror 3 and the first concave reflecting mirror 5 are respectively arranged on the mirror bracket with adjustable inclination angles, and the space positions of the pump light and the detection light can be realized by adjusting the inclination angles of the mirror bracket of the first reflecting mirror 2, the second reflecting mirror 3 and the first concave reflecting mirror 5.
In the invention, in order to change the incidence mode of laser, D-shaped mirrors (17, 18) can be arranged in parallel on the incidence light path of the beam splitter 1, and two pulses are respectively led into the beam splitter 1 through the D-shaped mirrors (17, 18), so that the invention can be used for pumping-detecting experiments of non-homochromatic laser pulses. In addition, a pulse shaping device can be added to the incident light path of the D-shaped mirrors (17, 18) to modulate the amplitude and phase of the laser pulse, thereby controlling the interaction between the laser and the substance.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The double-beam non-collinear pumping-detecting system is characterized by comprising a beam splitter, a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a fifth reflecting mirror, a first concave reflecting mirror, a second concave reflecting mirror, a spectroscope, a diaphragm, a spectrometer, a computer, a convex lens and a CCD camera; the first reflecting mirror is fixed on an electric displacement table, and the electric displacement table is connected with a computer;
Two D-shaped mirrors are arranged on an incident light path of the beam splitter in parallel, two pulses are respectively led into the beam splitter through the two D-shaped mirrors, the beam splitter divides incident laser into pumping light and detection light which are transmitted in parallel, a first reflecting mirror and a second reflecting mirror are arranged on a light beam outgoing light path of the beam splitter, the pumping light and the detection light respectively enter the first reflecting mirror and the second reflecting mirror, a first concave reflecting mirror is vertically arranged on a reflected light path of the first reflecting mirror and the second reflecting mirror, a third reflecting mirror is arranged on a reflected light path of the first concave reflecting mirror, a sample to be detected is arranged on a reflected light path of the third reflecting mirror, the sample to be detected is arranged below the third reflecting mirror, the beam splitter is arranged below the sample to be detected, the fourth reflecting mirror is arranged below the beam splitter, the diaphragm is arranged above the fourth reflecting mirror, and the second concave reflecting mirror is arranged above the diaphragm obliquely; a beam splitter is arranged on a beam path of a transmitted light after the light beam acts on a sample to be detected, a fourth reflector is arranged on a transmission light path of the beam splitter, a diaphragm is arranged on a reflection light path of the fourth reflector, pump light in the light beam is blocked by the diaphragm, detection light passes through the diaphragm, a second concave reflector is arranged on a detection light path passing through the diaphragm, a spectrometer is arranged on a reflection light path of the second concave reflector, and the spectrometer transmits a spectrum signal to a computer; the light beam focusing device is characterized in that a fifth reflecting mirror is arranged on a reflected light path of the spectroscope, a convex lens is arranged on a reflected light path of the fifth reflecting mirror, a CCD camera is arranged on a light beam emitting path after focusing of the convex lens, the convex lens is arranged above the fifth reflecting mirror, the CCD camera is arranged above the convex lens, and the CCD camera is connected with a computer.
2. The dual beam non-collinear pump-detection system of claim 1 wherein the beam splitter has an output beam intensity that is adjustable in the range of 0.1% to 100%.
3. The dual beam non-collinear pump-detection system of claim 1 wherein said first and second mirrors are square mirrors.
4. The dual beam non-collinear pump-detection system of claim 1 wherein pulse shaping means are provided in the incident light path of said D-mirror.
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| CN202010157064.8A CN111366544B (en) | 2020-03-09 | 2020-03-09 | Double-beam non-collinear pumping-detecting system |
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| CN202010157064.8A CN111366544B (en) | 2020-03-09 | 2020-03-09 | Double-beam non-collinear pumping-detecting system |
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| CN112798556B (en) * | 2020-12-10 | 2024-03-19 | 兰州大学 | Non-collinear time-resolved pumping-detecting device and method for infrared and frequency spectrum |
| CN112872581A (en) * | 2021-01-22 | 2021-06-01 | 华东师范大学 | Method and system for monitoring concurrent and simultaneous signals by CCD camera in real time |
| CN113075127A (en) * | 2021-03-31 | 2021-07-06 | 深圳中科飞测科技股份有限公司 | Optical path adjusting method, detecting apparatus, and storage medium |
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| CN104330398B (en) * | 2014-11-20 | 2017-03-29 | 福建师范大学 | A kind of multi-mode nonlinear optics micro imaging method and device |
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