CN114428059A - Terahertz magneto-optical experimental system based on terahertz pumping-optical Kerr detection - Google Patents
Terahertz magneto-optical experimental system based on terahertz pumping-optical Kerr detection Download PDFInfo
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Abstract
The invention discloses a terahertz magneto-optical experimental system based on terahertz pumping-optical Kerr detection, which comprises an optical damping platform and a lead screw, wherein two ends of the lead screw are respectively connected with a sample rack and a stepping motor, the stepping motor drives the lead screw to rotate, a sliding seat is connected to the outer side of the lead screw in a sliding manner, a group of symmetrically arranged push rods are rotatably connected to the outer side of the sliding seat, and the other end of each push rod is rotatably connected with an angle adjusting arm. The invention can rapidly determine the incidence angle and the reflection angle of the detection light through the stepping motor, the push rod, the angle adjusting arm, the polarizing module and the polarization analyzing module, is convenient to detect the Kerr angle of a sample under different reflection angles, simplifies the adjusting process of an optical device on a reflection light circuit, and is convenient for actual operation.
Description
Technical Field
The invention relates to the field of optical detection, in particular to a terahertz magneto-optical experimental system based on terahertz pumping-optical Kerr detection.
Background
The laser pumping-detecting technology is to utilize two ultrashort laser pulse sequences with time delay change to detect one ultrafast physical process in a sample for many times at different time, wherein one laser pulse is used as pumping light. The femtosecond laser is a light source which is most suitable for a pumping-detection technology at present, and the pumping light and the detection light can come from different light sources, but one common method is to generally split the emergent light of the laser to obtain the pumping light and the detection light.
In order to make the response of the sample to the detection light small and not enough to affect the detection result, the intensity of the detection light is generally much smaller than that of the pump light, which is about 1/100 of the pump light, so that the detection light is difficult to detect during the test, and at the same time, because the detection light and the pump light are usually focused on the surface of the sample at different incident angles, the pump light reflected by the sample is blocked, and the detection light is reflected by the sample and enters the detector. Therefore, a terahertz magneto-optical experimental system based on terahertz pump-optical Kerr detection is provided.
Disclosure of Invention
The invention mainly aims to provide a terahertz pumping-optical Kerr detection-based terahertz magneto-optical experimental system, which can rapidly determine the incident angle and the reflection angle of detection light through a stepping motor, a push rod, an angle adjusting arm, a polarizing module and a polarization analyzing module, is convenient for detecting the Kerr angle of a sample under different reflection angles, simplifies the adjusting process of an optical device on a reflection light circuit, is convenient for actual operation, and can effectively solve the problems in the background technology.
In order to realize the purpose, the invention adopts the technical scheme that: the utility model provides a terahertz is magnetic-optical experimental system now based on pumping of terahertz-light ke er surveys, is including the optics shock attenuation platform that is used for reducing optical noise and the lead screw that is used for adjusting the angle of incidence, the both ends of lead screw are connected with the sample frame that is used for fixed sample respectively and are used for driving lead screw pivoted step motor, and sample frame and step motor all install to fix in optics shock attenuation platform upper end, step motor drive lead screw rotates, and has the slide in the outside sliding connection of lead screw, the outside of slide rotates and is connected with the push rod that a set of symmetry set up, the other end rotation of push rod is connected with the angle modulation arm, the tip of angle modulation arm is connected with play inclined to one side module and offset module respectively through the spout, and the one end of angle modulation arm can rotate around the central plumb line of sample frame.
Furthermore, the polarizing module and the polarization detecting module are respectively composed of a group of telescopic cylinders which can slide relatively and are coaxial, a diaphragm and a polarizing prism are sequentially arranged in the telescopic cylinders of the polarizing module along the light propagation direction, and the polarizing prism can freely rotate in the telescopic cylinders.
Furthermore, a diaphragm, a polarization detection prism and a lens are sequentially arranged in a telescopic cylinder of the polarization detection module along the light propagation direction, and the polarization detection prism can freely rotate in the telescopic cylinder.
Furthermore, the electromagnets are symmetrically installed at the upper end of the sample frame and connected with a control microcomputer through a D/A converter, the control microcomputer is connected with an A/D converter and a driver, the A/D converter is connected with a photoelectric detector, the photoelectric detector is installed on an angle adjusting arm positioned on the left side of the sample frame and is in sliding connection with the angle adjusting arm, and the driver is connected with a stepping motor.
Furthermore, a femtosecond pulse device is installed at the upper end of the optical shock absorption platform, and a pulse signal transmission route of the femtosecond pulse device is provided withThe terahertz polarization device comprises a spectroscope, wherein a pulse signal of a femtosecond pulse device is divided into a detection light path and a pumping light path by the spectroscope, a reflecting plate is arranged on the detection light path, the detection light path enters a polarization module in a state of being parallel to the axis of a telescopic cylinder after being reflected by the reflecting plate, a terahertz generator and a lens are arranged on the pumping light path, the pumping light enters the terahertz generator after being reflected by the reflecting plate, and the femtosecond pulse signal generated by the femtosecond pulse device is reflected by the wavefront of a grating to excite LiNbO3The crystal generates terahertz pulses.
Further, the device comprises the following steps:
fixing angle adjusting arms, measuring initial included angles of the angle adjusting arms on two sides by using an angle meter, dividing femtosecond laser pulses emitted by a femtosecond pulser into two paths of light for pumping and detecting through a spectroscope, reflecting the pumping light by a reflecting plate, entering a terahertz generator, and measuring the initial included angles of the angle adjusting arms on two sides by using a LiNbO (LiNbO)3The crystal terahertz emission technology utilizes femtosecond pulse signals generated by a femtosecond pulser to excite LiNbO after grating wave front reflection3The crystal generates terahertz pulses, and the terahertz pulses are reflected by the reflecting plate, pass through the lens positioned on the upper side of the sample rack and then irradiate on the surface of the sample;
secondly, the detection light divided by the spectroscope is reflected by two stages of reflecting plates, sequentially passes through a diaphragm and a polarizing prism along a state parallel to an angle adjusting arm positioned on the right side of the sample rack and then irradiates on the surface of the sample, the detection light reflected by the surface of the sample passes through the diaphragm along a state parallel to the angle adjusting arm positioned on the left side of the sample rack, then sequentially passes through the polarizing prism and a lens and enters a photoelectric detector, the photoelectric detector converts the detected optical signal into an electric signal through an A/D converter, and a microcomputer is controlled to process the electric signal and output a spectral image;
setting a pulse numerical value through a control microcomputer, driving a stepping motor to operate through a driver, driving a screw rod to rotate, driving a sliding seat on the outer side to linearly move along the axial direction of the screw rod through the screw rod, driving a push rod to rotate, pushing the angle adjusting arm to rotate around a rotating shaft connected with the sample frame through the push rod, changing the included angle value between the angle adjusting arms, and obtaining a spectrum image in the included angle state.
Compared with the prior art, the invention has the following beneficial effects:
1) through the stepping motor, the push rod and the angle adjusting arm, the stepping motor operates under the pulse drive of the driver and drives the screw rod to rotate, the screw rod drives the sliding seat on the outer side to linearly move along the axial direction of the screw rod, so that the push rod is driven to rotate, the push rod pushes the angle adjusting arm to rotate around the rotating shaft connected with the sample rack, after the initial included angle of the angle adjusting arms on the two sides is measured, the accurate adjustment of the included angle between the angle adjusting arms can be realized only by setting a pulse signal output by the driver through a control microcomputer, so that the incident angle and the reflection angle of the detection light can be rapidly determined, and meanwhile, the Kerr angle of the sample can be conveniently detected under the conditions of different reflection angles;
2) the polarizing prism and the auxiliary optical device on the incident light path and the polarizing prism and the auxiliary optical device on the reflected light path are intensively arranged in the telescopic cylinder through the polarizing module and the polarization analyzing module, so that the installation of each optical device is convenient, and simultaneously, after the incident angle is determined, the position of an optical instrument on the reflected light path does not need to be greatly adjusted, only the polarizing prism and the polarizing prism need to be rotated to adjust the polarizing angle and the polarization analyzing angle, the adjusting process of the optical device on the reflected light path is simplified, and the actual operation is convenient;
3) through the arranged terahertz generator, by means of LiNbO3The crystal terahertz emission technology utilizes femtosecond pulse signals generated by a femtosecond pulser to excite LiNbO after grating wave front reflection3The crystal generates terahertz pulses, so that the energy of terahertz source pulses in the terahertz time-domain spectroscopy system is improved, and the physical characteristics of microscopic particles of a sample to be detected are favorably excited and detected.
Drawings
In order to more clearly illustrate the technical solutions of the present invention, the drawings required to be used in the technical description of the present invention will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings may be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic diagram of an overall structure of a terahertz magneto-optical experimental system based on terahertz pump-optical Kerr detection according to the present invention;
FIG. 2 is a schematic view of a connection structure of a terahertz magneto-optical experimental system wire rod based on terahertz pump-optical Kerr detection according to the present invention;
FIG. 3 is a schematic structural diagram of a terahertz magneto-optical experimental system polarization module based on terahertz pump-optical Kerr detection according to the present invention;
FIG. 4 is a schematic structural diagram of a terahertz magneto-optical experimental system analyzer module based on terahertz pump-optical Kerr detection according to the present invention;
FIG. 5 is a structural schematic diagram of a terahertz generator of a terahertz magneto-optical experimental system based on terahertz pump-optical Kerr detection according to the present invention;
FIG. 6 is a schematic cross-sectional structure diagram of a polarization module of a terahertz magneto-optical experimental system based on terahertz pump-optical Kerr detection according to the present invention;
fig. 7 is a schematic cross-sectional structure view of an analyzing module of a terahertz magneto-optical experimental system based on terahertz pump-optical kerr detection in the present invention.
In the figure: 1. an optical shock absorbing platform; 2. a screw rod; 3. a sample holder; 4. a stepping motor; 5. a slide base; 6. a push rod; 7. an angle adjusting arm; 8. a polarizing module; 9. a polarization analyzing module; 10. a telescopic cylinder; 11. a diaphragm; 12. a polarizing prism; 13. an analyzer prism; 14. a lens; 15. an electromagnet; 16. a D/A converter; 17. a control microcomputer; 18. an A/D converter; 19. a driver; 20. a photodetector; 21. a femtosecond pulser; 22. a beam splitter; 23. a reflective plate; 24. terahertz generator.
Detailed Description
The present invention will be further described with reference to the following detailed description, wherein the drawings are for illustrative purposes only and are not intended to be limiting, wherein certain elements may be omitted, enlarged or reduced in size, and are not intended to represent the actual dimensions of the product, so as to better illustrate the detailed description of the invention.
Example 1
As shown in fig. 1-7, a terahertz magneto-optical experimental system based on terahertz pumping-optical kerr detection comprises an optical damping platform 1 and a lead screw 2, two ends of the lead screw 2 are respectively connected with a sample holder 3 and a stepping motor 4, the sample holder 3 and the stepping motor 4 are both installed and fixed on the upper end of the optical damping platform 1, the stepping motor 4 drives the lead screw 2 to rotate, a slide holder 5 is slidably connected to the outer side of the lead screw 2, a set of symmetrically arranged push rods 6 are rotatably connected to the outer side of the slide holder 5, the other end of the push rods 6 is rotatably connected with an angle adjusting arm 7, the end of the angle adjusting arm 7 is respectively connected with a polarization module 8 and a polarization detection module 9 through a sliding chute, and one end of the angle adjusting arm 7 can rotate around the central perpendicular line of the sample holder 3.
The upper end of the sample holder 3 is symmetrically provided with electromagnets 15, the electromagnets 15 are connected with a control microcomputer 17 through a D/A converter 16, the control microcomputer 17 is connected with an A/D converter 18 and a driver 19, the A/D converter 18 is connected with a photoelectric detector 20, the photoelectric detector 20 is arranged on an angle adjusting arm 7 positioned on the left side of the sample holder 3 and is in sliding connection with the angle adjusting arm 7, and the driver 19 is connected with the stepping motor 4.
By adopting the technical scheme: through the step motor 4 that is equipped with, push rod 6 and angle modulation arm 7, step motor 4 operates under the pulse drive of driver 19, and drive lead screw 2 and rotate, the axial rectilinear motion of slide 5 along lead screw 2 in the lead screw 2 drive outside lead screw 2, thereby drive push rod 6 and rotate, push rod 6 promotes angle modulation arm 7 and rotates around the axis of rotation of being connected with sample frame 3, after the initial contained angle of angle modulation arm 7 in record both sides, only need can realize the accurate regulation of contained angle between the angle modulation arm 7 through the pulse signal that control microcomputer 17 set for driver 19 output, thereby the incident angle and the reflection angle of definite survey light that can be quick, be convenient for simultaneously under the ke's angle of surveying the sample under the different reflection angle condition.
Example 2
As shown in fig. 1 to 7, a terahertz magneto-optical experimental system based on terahertz pumping-optical kerr detection includes an optical damping platform 1 and a lead screw 2, two ends of the lead screw 2 are respectively connected with a sample holder 3 and a stepping motor 4, and the sample holder 3 and the stepping motor 4 are both installed and fixed on the upper end of the optical damping platform 1, the stepping motor 4 drives the lead screw 2 to rotate, and a sliding seat 5 is connected to the outer side of the lead screw 2 in a sliding manner, a set of push rods 6 symmetrically arranged are rotatably connected to the outer side of the sliding seat 5, the other end of the push rods 6 is rotatably connected with an angle adjusting arm 7, the end of the angle adjusting arm 7 is respectively connected with a polarization module 8 and a polarization detection module 9 through sliding grooves, and one end of the angle adjusting arm 7 can rotate around a central perpendicular line of the sample holder 3.
The polarizing module 8 and the polarization analyzing module 9 are respectively composed of a group of coaxial telescopic cylinders 10 capable of sliding relatively, a diaphragm 11 and a polarizing prism 12 are sequentially arranged inside the telescopic cylinders 10 of the polarizing module 8 along the light propagation direction, and the polarizing prism 12 can freely rotate inside the telescopic cylinders 10.
The inside of the telescopic cylinder 10 of the polarization detection module 9 is sequentially provided with a diaphragm 11, a polarization detection prism 13 and a lens 14 along the light propagation direction, and the polarization detection prism 13 can freely rotate inside the telescopic cylinder 10.
By adopting the technical scheme: through the polarizing module 8 and the polarization analyzing module 9, the polarizing prism 12 and the auxiliary optical device on the incident light path and the polarizing prism 13 and the auxiliary optical device on the reflected light path are intensively installed inside the telescopic cylinder 10, so that the installation of each optical device is convenient, and after the incident angle is determined, the position of an optical instrument on the reflected light path is not required to be greatly adjusted, and only the polarizing prism 13 and the polarizing prism 12 are required to be rotated to adjust the polarizing angle and the polarizing angle, thereby simplifying the adjusting process of the optical device on the reflected light path and facilitating the actual operation.
Example 3
As shown in fig. 1-7, a terahertz magneto-optical experimental system based on terahertz pumping-optical kerr detection comprises an optical damping platform 1 and a lead screw 2, two ends of the lead screw 2 are respectively connected with a sample holder 3 and a stepping motor 4, the sample holder 3 and the stepping motor 4 are both installed and fixed on the upper end of the optical damping platform 1, the stepping motor 4 drives the lead screw 2 to rotate, a slide holder 5 is slidably connected to the outer side of the lead screw 2, a set of symmetrically arranged push rods 6 are rotatably connected to the outer side of the slide holder 5, the other end of the push rods 6 is rotatably connected with an angle adjusting arm 7, the end of the angle adjusting arm 7 is respectively connected with a polarization module 8 and a polarization detection module 9 through a sliding chute, and one end of the angle adjusting arm 7 can rotate around the central perpendicular line of the sample holder 3.
The upper end of the optical shock absorption platform 1 is provided with the femtosecond pulser 21, a spectroscope 22 is arranged on a pulse signal propagation route of the femtosecond pulser 21, the spectroscope 22 divides a pulse signal of the femtosecond pulser 21 into a detection light path and a pumping light path, a reflecting plate 23 is arranged on the detection light path, the detection light path enters the polarization module 8 in a parallel state with the axis of the telescopic cylinder 10 after being reflected by the reflecting plate 23, a terahertz generator 24 and a lens 14 are arranged on the pumping light path, and the pumping light enters the terahertz generator 24 after being reflected by the reflecting plate 23.
By adopting the technical scheme: by means of a terahertz generator 24 provided with LiNbO3The crystal terahertz emission technology utilizes femtosecond pulse signals generated by a femtosecond pulser 21 to excite LiNbO after grating wave front reflection3The crystal generates terahertz pulses, so that the energy of terahertz source pulses in the terahertz time-domain spectroscopy system is improved, and the physical characteristics of microscopic particles of a sample to be detected are favorably excited and detected.
The invention is a terahertz magneto-optical experimental system based on optical pumping-terahertz Faraday rotation detection, when in use, the angle adjusting arm 7 is fixed, an angle instrument is used for measuring the initial included angle of the angle adjusting arms 7 at two sides, femtosecond laser pulse emitted by a femtosecond pulser 21 is divided into two paths of pumping light and detection light through a spectroscope 22, the pumping light enters a terahertz generator 24 after being reflected by a reflecting plate, and LiNbO is used for realizing the purpose of the terahertz magneto-optical experimental system3The crystal terahertz emission technology utilizes a femtosecond pulse signal generated by a femtosecond pulser 21 to excite LiNbO after grating wave front reflection3The crystal generates terahertz pulses, and after the terahertz pulses are reflected by the reflecting plate,the light passes through a lens positioned on the upper side of a sample holder and then irradiates on the surface of a sample, detection light divided by a spectroscope 22 is reflected by a two-stage reflecting plate 23, sequentially passes through a diaphragm 11 and a polarizing prism 12 along a state parallel to an angle adjusting arm 7 positioned on the right side of the sample holder 3 and then irradiates on the surface of the sample, the detection light reflected by the surface of the sample passes through the diaphragm 11 along a state parallel to the angle adjusting arm 7 positioned on the left side of the sample holder 3, then passes through a polarizing prism 13 and a lens 14 in sequence and enters a photoelectric detector 20, the photoelectric detector 20 converts detected light signals into electric signals through an A/D converter 18, a control microcomputer 17 processes the electric signals and then outputs a spectral image, a pulse numerical value is set through the control microcomputer 17, a driver 19 drives a stepping motor 4 to operate and drives a screw rod 2 to rotate, and the screw rod 2 drives a slide 5 on the outer side to linearly move along the axial direction of the screw rod 2, thereby drive push rod 6 and rotate, push rod 6 promotes angle modulation arm 7 and rotates around the axis of rotation of being connected with sample holder 3 to change the contained angle value between the angle modulation arm 7, and acquire the spectral image under this contained angle state.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a terahertz magneto-optical experimental system based on pumping of terahertz-light ke er surveys, includes optics shock attenuation platform (1) and lead screw (2), its characterized in that: the both ends of lead screw (2) are connected with sample frame (3) and step motor (4) respectively, and sample frame (3) and step motor (4) all install to be fixed in optics shock attenuation platform (1) upper end, step motor (4) drive lead screw (2) rotate, and have slide (5) in the outside sliding connection of lead screw (2), the outside of slide (5) is rotated and is connected with push rod (6) that a set of symmetry set up, the other end rotation of push rod (6) is connected with angle modulation arm (7), the tip of angle modulation arm (7) is connected with respectively through the spout and plays inclined to one side module (8) and examine inclined to one side module (9), and the one end of angle modulation arm (7) can rotate around the central plumb line of sample frame (3).
2. The terahertz magneto-optical experimental system based on terahertz pump-optical kerr detection as claimed in claim 1, wherein: the polarization module (8) and the polarization detection module (9) are respectively composed of a group of telescopic cylinders (10) which can slide relatively and are coaxial, a diaphragm (11) and a polarization prism (12) are sequentially arranged in the telescopic cylinders (10) of the polarization module (8) along the light propagation direction, and the polarization prism (12) can freely rotate in the telescopic cylinders (10).
3. The terahertz magneto-optical experimental system based on terahertz pump-optical kerr detection as claimed in claim 1, wherein: a diaphragm (11), a polarization detection prism (13) and a lens (14) are sequentially arranged in a telescopic cylinder (10) of the polarization detection module (9) along the light propagation direction, and the polarization detection prism (13) can freely rotate in the telescopic cylinder (10).
4. The terahertz magneto-optical experimental system based on terahertz pump-optical kerr detection as claimed in claim 1, wherein: electromagnet (15) are installed to sample frame (3) upper end symmetry, electromagnet (15) are connected with control computer (17) through DA converter (16), control computer (17) are connected with AD converter (18) and driver (19), AD converter (18) are connected with photoelectric detector (20), photoelectric detector (20) are installed on being located the left angle modulation arm (7) of sample frame (3), and with angle modulation arm (7) sliding connection, driver (19) are connected with step motor (4).
5. The terahertz magneto-optical experimental system based on terahertz pump-optical kerr detection as claimed in claim 1, wherein: the optical shock absorption platform is characterized in that a femtosecond pulser (21) is installed at the upper end of the optical shock absorption platform (1), a spectroscope (22) is arranged on a pulse signal transmission route of the femtosecond pulser (21), the spectroscope (22) divides a pulse signal of the femtosecond pulser (21) into a detection light path and a pumping light path, a reflecting plate (23) is arranged on the detection light path, the detection light path is reflected by the reflecting plate (23) and then enters the polarization module (8) in a parallel state with the axis of the telescopic cylinder (10), and a terahertz generator (24) and a lens (14) are arranged on the pumping light path.
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|---|---|---|---|---|
| CN107782694A (en) * | 2017-09-28 | 2018-03-09 | 上海无线电设备研究所 | Terahertz time-domain spectroscopy complete polarization electromagnetic scattering measuring system and acquisition methods |
| CN112345071A (en) * | 2020-11-05 | 2021-02-09 | 南京工程学院 | Low-temperature rotation test system suitable for terahertz radiation power |
| CN114047158A (en) * | 2021-11-17 | 2022-02-15 | 南京工程学院 | Terahertz magneto-optical experimental system based on terahertz pumping-optical Kerr detection |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782694A (en) * | 2017-09-28 | 2018-03-09 | 上海无线电设备研究所 | Terahertz time-domain spectroscopy complete polarization electromagnetic scattering measuring system and acquisition methods |
| CN112345071A (en) * | 2020-11-05 | 2021-02-09 | 南京工程学院 | Low-temperature rotation test system suitable for terahertz radiation power |
| CN114047158A (en) * | 2021-11-17 | 2022-02-15 | 南京工程学院 | Terahertz magneto-optical experimental system based on terahertz pumping-optical Kerr detection |
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