CN112051236A - Optical delay module and terahertz detection system - Google Patents
Optical delay module and terahertz detection system Download PDFInfo
- Publication number
- CN112051236A CN112051236A CN202010955081.6A CN202010955081A CN112051236A CN 112051236 A CN112051236 A CN 112051236A CN 202010955081 A CN202010955081 A CN 202010955081A CN 112051236 A CN112051236 A CN 112051236A
- Authority
- CN
- China
- Prior art keywords
- optical
- flywheel
- delay module
- optical delay
- conversion device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 154
- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- 230000002093 peripheral effect Effects 0.000 claims abstract description 10
- 230000010287 polarization Effects 0.000 claims description 27
- 239000013307 optical fiber Substances 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims 1
- 238000005070 sampling Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N21/17—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
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3581—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation
- G01N21/3586—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using far infrared light; using Terahertz radiation by Terahertz time domain spectroscopy [THz-TDS]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
- G01J3/0224—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using polarising or depolarising elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/12—Generating the spectrum; Monochromators
- G01J2003/1291—Generating the spectrum; Monochromators polarised, birefringent
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Toxicology (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The embodiment of the invention provides an optical delay module and a terahertz detection system, wherein the optical delay module comprises an optical input interface, an optical output interface, an optical conversion device and a rotatable flywheel; the peripheral side surface of the flywheel is provided with a reflecting area, and the projection of the reflecting area in a plane vertical to the rotation axis of the flywheel is in involute arrangement; the optical input interface, the optical output interface and the optical conversion device are all positioned at the periphery of the flywheel. According to the optical delay module provided by the embodiment of the invention, the optical delay time is linearly changed along with the rotation of the flywheel according to the involute principle. Therefore, high-speed optical delay can be completed under the condition that the flywheel rotates at a high speed, and the detection efficiency of the terahertz detection system is greatly improved.
Description
Technical Field
The invention relates to the technical field of laser systems, in particular to an optical delay module and a terahertz detection system.
Background
The bottleneck problem of the current terahertz detection system applied to practical engineering is that the detection speed is low, and the key point is that a high-speed optical delay line with a larger range is lacked. The optical delay line is an optical-mechanical-electrical integrated device capable of changing an optical path, and can realize linear scanning of a time domain signal in a terahertz detection system, so that a complete terahertz time domain pulse signal is obtained. The efficiency of the optical delay implementation mode directly determines the acquisition speed of the terahertz signal, so that the working efficiency of the terahertz detection system is further determined. Therefore, in the field of terahertz detection system integration, the design and development of a modular optical delay line are very important, and an optical delay module is a key core module for improving the detection efficiency of the terahertz detection system.
In an existing terahertz detection system, an optical delay module generally drives a mirror (or a right-angle reflector) on a micro-displacement platform to move through a stepping motor so as to change an optical path and realize optical delay. Although the optical delay implementation method can be used for reconstructing the terahertz pulse with high precision, a large amount of time cost is needed, generally, a complete pulse signal needs to be scanned for several seconds to several minutes, at least several hours to several days are needed for completing two-dimensional imaging of a large object, and the problem of low detection efficiency exists.
Disclosure of Invention
The embodiment of the invention provides an optical delay module and a terahertz detection system, which are used for solving the problem that the existing optical delay module causes the detection efficiency of the terahertz detection system to be lower, and meanwhile, the factors such as the detection speed, the detection precision, the volume and the weight of the device are comprehensively considered.
The embodiment of the invention provides an optical delay module, which comprises an optical input interface, an optical output interface, an optical conversion device and a rotatable flywheel, wherein the optical input interface is connected with the optical output interface;
the peripheral side surface of the flywheel is provided with a reflecting area, and the projection of the reflecting area in a plane vertical to the rotation axis of the flywheel is in involute arrangement;
the optical input interface, the optical output interface and the optical conversion device are all positioned on the periphery of the flywheel, so that laser input from the optical input interface is emitted to the reflection area through the optical conversion device, and is emitted to the optical output interface through the optical conversion device after being reflected by the reflection area.
According to an embodiment of the optical delay module, the optical input interface is configured to make the laser light incident to the optical conversion device be gaussian parallel light.
According to an embodiment of the optical delay module of the present invention, the flywheel is a zero-phase start flywheel.
According to the optical delay module of one embodiment of the present invention, at least three reflection regions are uniformly spaced along the circumferential direction of the flywheel on the circumferential side surface of the flywheel.
According to the optical delay module of one embodiment of the present invention, the peripheral side surface of the flywheel is provided with a connection area, one connection area is connected between any two adjacent reflection areas, and the connection area is configured not to affect the normal operation of the reflection areas.
According to the optical retardation module of one embodiment of the present invention, the optical conversion device sequentially includes a high polarization ratio polarizer, a polarization beam splitter, a quarter-wave plate, and a line beam forming lens from the optical input interface to the flywheel, wherein the line beam forming lens is configured to obtain a line beam;
the polarization direction of the high-polarization-ratio polaroid is consistent with the light transmission direction of the polarization beam splitter;
the light output interface is arranged corresponding to the polarization beam splitter, so that the laser reflected by the reflection area is sequentially reflected to the light output interface directly or through a plurality of reflectors after passing through the line beam forming lens, the quarter wave plate and the polarization beam splitter.
According to an embodiment of the optical delay module, the line beam forming lens includes at least one of a cylindrical lens, a pyramid lens and a metamaterial lens.
According to an embodiment of the present invention, the optical delay module further includes a controller, an encoder, a driving device, an input fiber coupler and an output fiber coupler, where the input fiber coupler and the output fiber coupler are respectively disposed at the optical input interface and the optical output interface; the driving device is used for driving the flywheel to rotate, and the driving device, the input optical fiber coupler and the output optical fiber coupler are electrically connected with the controller.
According to an embodiment of the optical delay module of the present invention, the rotation speed of the flywheel is 18000 rpm.
The embodiment of the invention also provides a terahertz detection system which comprises the optical delay module.
The optical delay module provided by the embodiment of the invention enables the optical delay time to be linearly changed along with the rotation of the flywheel according to the involute principle. Therefore, under the condition that the flywheel rotates at a high speed, high-speed optical delay can be completed, and the detection efficiency of the terahertz detection system is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical delay module according to an embodiment of the present invention, in which a flywheel is a zero-phase starting flywheel;
fig. 2 is a schematic structural diagram of another optical delay module according to an embodiment of the present invention, in which the flywheel is a pi/2 phase start flywheel.
Reference numerals:
100: an optical delay module; 1: an optical input interface; 2: an optical output interface; 3: a light conversion device; 31: a polarizing beam splitter; 32: a quarter wave plate; 33: a line beam forming lens; 4: a flywheel; 41: a reflective region; 42: a connecting region.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the invention provides an optical delay module, which can be applied to a terahertz detection system, and fig. 1 is an embodiment of the optical delay module provided by the invention.
Specifically, as shown in fig. 1, in the present embodiment, the optical delay module 100 includes an optical input interface 1, an optical output interface 2, an optical conversion device 3, and a rotatable flywheel 4; the peripheral side surface of the flywheel 4 is provided with a reflecting area 41, and the projection of the reflecting area 41 in a plane vertical to the rotation axis of the flywheel 4 is an involute arrangement; the optical input interface 1, the optical output interface 2 and the optical conversion device 3 are all located at the periphery of the flywheel 4, so that laser light (femtosecond light is taken as an example in the following) input from the optical input interface 1 is emitted to the reflection area 41 through the optical conversion device 3, and is emitted to the optical output interface 2 through the optical conversion device 3 after being reflected by the reflection area 41. The reflection area 41 is arranged in an involute shape, and since the distance from a point on the involute (the point of irradiation of the femtosecond light on the reflection area 41) to the tangent point of the normal line passing through the point and the base circle is equal to the radius of the base circle multiplied by the rotation angle of the point, the distance is changed linearly with the rotation of the flywheel 4, and further, the light delay time is changed linearly with the rotation of the flywheel 4. The rotation of the flywheel 4 can make the femtosecond light irradiated on the reflection region 41 always return in the original path (i.e. the reflection region 41 can reversely reflect the femtosecond light), and the optical path of the femtosecond light can be linearly changed in a large range. The optical output interface 2 ensures that the laser light incident on the optical conversion device 3 is gaussian parallel light. Generally, when the incident light is transmitted by an optical fiber, the optical output interface 2 is a coupling device from the optical fiber to a free space; when the incident light is transmitted in free space, the light output interface 2 is a confocal lens set or a reflector set.
The optical delay module 100 provided in the embodiment of the present invention makes the optical delay time change linearly with the rotation of the flywheel 4 according to the involute principle. Therefore, under the condition that the flywheel 4 rotates at a high speed, high-speed optical delay can be completed, so that the detection efficiency of the terahertz detection system is greatly improved, and meanwhile, the optical delay module 100 is also beneficial to controlling the manufacturing cost and improving the integration level and the reliability of the terahertz detection system.
As shown in fig. 1, in the present embodiment, the peripheral side surface of the flywheel 4 is provided with at least three reflection regions 41 at intervals in the circumferential direction of the flywheel 4. Each reflection region 41 of the flywheel 4 can complete one-time optical delay, so that the flywheel 4 can complete multiple optical delays after rotating for one circle, and high-speed optical delay is realized. For example, in the present embodiment, four reflection regions 41 are uniformly distributed on the peripheral side surface of the flywheel 4 along the circumferential direction of the flywheel 4, so that the structure of the flywheel 4 is simple.
As shown in fig. 1, in the present embodiment, the peripheral side surface of the flywheel 4 is provided with a connection region 42, one connection region 42 is connected between any two adjacent reflection regions 41, the connection region 42 is configured not to affect the normal operation of the reflection regions 41, specifically, in the present embodiment, the connection region 42 is parallel to the rotation axis of the flywheel 4, and the projection of the connection region 42 in the plane perpendicular to the rotation axis of the flywheel 4 is a connection line which does not affect the normal operation of the reflection regions 41 and can perform a connection function, and the connection line may be any straight line, curved line, or a combination of straight line and curved line.
The optical input interface 1, the optical output interface 2 and the optical conversion device 3 are all located at the periphery of the flywheel 4, specifically, as shown in fig. 1, in the present embodiment, the optical input interface 1, the optical conversion device 3 and the flywheel 4 are arranged along a first direction, and the optical conversion device 3 is located between the optical input interface 1 and the flywheel 4; the light output interface 2 is located at one side of the light conversion means 3 in a second direction, wherein the first direction intersects the second direction. This allows the main components of the optical delay module 100 to be arranged more compactly, which is advantageous for reducing the size of the optical delay module 100.
Further, as shown in fig. 1, in the present embodiment, the first direction, the second direction, and the direction of the rotational axis of the flywheel 4 are perpendicular to each other two by two. Thus, the optical input interface 1, the optical output interface 2, the optical conversion device 3 and the flywheel 4 are all located in a plane, which is more beneficial to reducing the volume of the optical delay module 100.
Generally, the optical delay module 100 further includes a controller, a driving device, an input fiber coupler and an output fiber coupler, where the input fiber coupler and the output fiber coupler are respectively disposed at the optical input interface 1 and the optical output interface 2; the driving device is used for driving the flywheel 4 to rotate, and the driving device, the input optical fiber coupler and the output optical fiber coupler are electrically connected with the controller. The optical delay module 100 is composed of an optical device, an optical electromechanical device, a mounting bracket and the like, wherein the optical component comprises an optical conversion device 3, an input optical fiber coupler, an output optical fiber coupler and the like; the optical electromechanical device comprises a flywheel 4, a driving device, an encoder, a controller, a driving instruction, a communication interface, a tail fiber and the like. The optical delay module 100 provides two optical fiber interfaces (i.e. an optical input interface 1 and an optical output interface 2) for inputting and outputting laser light; the power supply and control interface of the driving device is used for controlling the rotating speed of the flywheel 4; the driving instruction comprises a collection trigger signal which is used for triggering a collection card to collect signals, so that high-precision equal-angle sampling is realized.
The rotary optical delay line has high speed, and simultaneously, the speed is not infinitely high and can be limited by the speed of devices such as a motor, an acquisition card and the like; the method is also influenced by the error of the divergence angle of the light beam, the divergence angle error is limited by the depth of focus of the light beam and the size of a flywheel blade in space, and the larger the size is, the larger the error is; but also by face shape errors. Various factors are mutually restricted, so that the realization of the largest delay range under the condition of smallest size and weight or the realization of the higher speed is more facilitated by making the size of the optical delay module as small as possible under the condition of determining the required delay range. Therefore, the speed, the range, the size and the error must be considered comprehensively, as shown in fig. 1, in this embodiment, the flywheel 4 is a zero-phase start flywheel, and the zero-phase start involute reflecting surface and the multi-reflecting area are adopted, which is the key for realizing the small-size, large-range and high-speed optical delay. The terahertz detection device is more beneficial to integration of the terahertz system, and is especially important for scenes with high requirements on detection speed or high requirements on the volume and weight of the detection device.
As shown in fig. 1, the reflective region 41 has a proximal end close to the rotation axis of the flywheel 4 and a distal end far from the rotation axis of the flywheel 4, and the flywheel 4 is a zero-phase start flywheel, i.e. the primary optical retardation is recorded from the distal end of the reflective region 41 to the proximal end of the reflective region 41. Under the condition of ensuring the same delay amount, the sampling zero-phase starting flywheel can relatively reduce the size and the mass of the flywheel 4, and is beneficial to improving the rotating speed of the flywheel 4, thereby realizing higher delay efficiency. And, reducing the size and mass of the flywheel 4 is also beneficial to reducing the vibration error, thereby effectively improving the stability of the signal. As shown in fig. 1 and fig. 2, taking the flywheel 4 as a four-blade flywheel (the four-blade flywheel, i.e. the flywheel 4 includes four reflection regions 41) and the delay times are all 300ps, if the flywheel 4 is a pi/2 phase start flywheel, the outer circle radius is 94.38 mm; if the flywheel 4 is a zero phase starting flywheel, the radius of the circumscribed circle thereof is 53.31 mm.
In the embodiment, the rotation speed of the flywheel 4 is 18000 rpm, and taking the flywheel 4 as a four-blade flywheel as an example, the scanning speed of the optical delay module 100 is 1200 time domain pulses/second, so that the scanning imaging speed is fast.
When the femtosecond light is irradiated onto the reflective region 41, since the femtosecond light is focused with a physical size, it is not an ideal line beam, and thus there is a reflection error. To reduce reflection errors, it is desirable that the line beam be as thin as possible. In addition, during the rotation of the flywheel 4, the action positions of the incident light beams and the reflection area 41 are linearly and dynamically changed, which is also the principle for realizing the optical delay, but the interface reflectivity of the converged light beams at different positions on the reflection area 41 has a systematic deviation, and when the middle point of the delay amount is positioned on the focal plane of the converged light beams, the systematic error at the two ends of the reflection area 41 can be minimized. Therefore, the focal depth of the light beam is required to be as long as possible to cover the delay amount range of the flywheel 4. However, the long focal length and the thin beam are mutually restricted, as shown in fig. 1, in this embodiment, the light conversion device 3 comprises a high polarization ratio polarizer (not shown in the figure), a polarization beam splitter 31, a quarter wave plate 32 and a line beam forming lens 33 in sequence from the light input interface 1 to the flywheel 4, and the line beam forming lens 33 is used for acquiring a line light beam; the polarization direction of the high polarization ratio polarizer is consistent with the light transmission direction of the polarization beam splitter 31; the optical output interface 2 is disposed corresponding to the polarization beam splitter 31, so that the laser light reflected by the reflection region 41 sequentially passes through the line beam forming lens 33, the quarter wave plate 32 and the polarization beam splitter 31 and then is emitted to the optical output interface 2 (the emergent light of the polarization beam splitter 31 can be emitted to the optical output interface 2 directly or after passing through a plurality of mirrors). The line beam forming lens 33 may be a cylindrical lens, a pyramid lens, a metamaterial lens, or a combination of a cylindrical lens, a pyramid lens, and a metamaterial lens. By properly configuring the parameters of the line beam forming lens 33, a long depth of field of beamlets can be obtained, further improving system performance.
As shown in fig. 1, the optical input interface 1, the optical output interface 2, the optical conversion device 3 and the flywheel 4 may be disposed on the same housing or base, and each element ensures that the femtosecond beam is centered in the same plane. The incident femtosecond light is transmitted through the optical fiber coupling at the optical input interface 1 and converted into the collimated femtosecond plane wave at the tail end of the optical fiber through the input optical fiber coupler. Then, the collimated femtosecond plane wave is vertically irradiated into the polarization beam splitter 31, and the polarization direction of the femtosecond light at this time is adjusted to be identical to the transmission direction of the polarization beam splitter 31. The transmitted light passes through the quarter-wave plate 32 to form circularly polarized light, and then is condensed into a line beam by the cylindrical mirror. The line beam is directed perpendicularly onto the reflective region 41 of the flywheel 4 and is precisely adjusted so that the reflected light returns as it rotates on the flywheel 4. The reverse light is reduced into the collimated light after passing through the cylindrical mirror, and is converted into the linearly polarized light by circular polarization after passing through the quarter-wave plate 32 again, but the polarization direction of the linearly polarized light is just perpendicular to the original incident light at the moment, so the linearly polarized light cannot penetrate through the polarization beam splitter 31 but is reflected by the polarization beam splitter 31, and the reflected light beam is coupled into the optical fiber at the optical output interface 2 through the output optical fiber coupler.
The embodiment of the invention also provides a terahertz detection system which comprises the optical delay module. By adopting the optical delay module, the detection efficiency of the terahertz detection system can be greatly improved, for example, the terahertz detection system can meet the actual requirement of engine detection engineering application.
Taking the index of which the delay range is 300ps and the detection speed is more than 100Hz as an example, the two indexes cannot be reached by adopting the traditional delay mode of the linear motor; the delay mode of voice coil vibration is almost not up to 300ps delay range; although the asynchronous sampling delay method can realize the two indexes, two lasers are needed, an asynchronous signal sampling system is needed to be developed, system errors are difficult to control due to frequency jitter of the asynchronous sampling system, and meanwhile, the cost of the asynchronous sampling delay method is several times higher than that of the optical delay module.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An optical delay module is characterized by comprising an optical input interface, an optical output interface, an optical conversion device and a rotatable flywheel;
the peripheral side surface of the flywheel is provided with a reflecting area, and the projection of the reflecting area in a plane vertical to the rotation axis of the flywheel is in involute arrangement;
the optical input interface, the optical output interface and the optical conversion device are all positioned on the periphery of the flywheel, so that laser input from the optical input interface is emitted to the reflection area through the optical conversion device, and is emitted to the optical output interface through the optical conversion device after being reflected by the reflection area.
2. The optical delay module of claim 1 wherein the optical input interface is configured to make the laser light incident on the optical conversion device be gaussian parallel light.
3. The optical delay module of claim 1 wherein the flywheel is a zero phase start flywheel.
4. An optical delay module according to any one of claims 1 to 3, wherein at least three said reflection regions are provided on a peripheral side surface of the flywheel at regular intervals along a circumferential direction of the flywheel.
5. An optical delay module as claimed in claim 4, wherein the peripheral side surface of the flywheel is provided with a connection region, and one connection region is connected between any two adjacent reflection regions, and the connection region is configured not to affect the normal operation of the reflection regions.
6. The optical delay module as claimed in any one of claims 1 to 3, wherein the optical conversion device comprises a high polarization ratio polarizer, a polarization beam splitter, a quarter-wave plate and a line beam forming lens in sequence from the optical input interface to the flywheel, the line beam forming lens being used for obtaining a line beam;
the polarization direction of the high-polarization-ratio polaroid is consistent with the light transmission direction of the polarization beam splitter;
the light output interface is arranged corresponding to the polarization beam splitter, so that the laser reflected by the reflection area is sequentially reflected to the light output interface directly or through a plurality of reflectors after passing through the line beam forming lens, the quarter wave plate and the polarization beam splitter.
7. The optical delay module of claim 6 wherein the line beam shaping lens comprises at least one of a cylindrical mirror, a pyramidal mirror, and a metamaterial lens.
8. The optical delay module of any one of claims 1-3, further comprising a controller, an encoder, a driving device, an input fiber coupler and an output fiber coupler, wherein the input fiber coupler and the output fiber coupler are respectively disposed at the optical input interface and the optical output interface; the driving device is used for driving the flywheel to rotate, and the driving device, the input optical fiber coupler and the output optical fiber coupler are electrically connected with the controller.
9. An optical delay module as claimed in any one of claims 1 to 3, wherein the flywheel has a rotational speed of 18000 rpm.
10. A terahertz detection system comprising the optical delay module of any one of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010955081.6A CN112051236A (en) | 2020-09-11 | 2020-09-11 | Optical delay module and terahertz detection system |
| PCT/CN2021/089787 WO2022052477A1 (en) | 2020-09-11 | 2021-04-26 | Optical delay module and terahertz detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010955081.6A CN112051236A (en) | 2020-09-11 | 2020-09-11 | Optical delay module and terahertz detection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112051236A true CN112051236A (en) | 2020-12-08 |
Family
ID=73611563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010955081.6A Pending CN112051236A (en) | 2020-09-11 | 2020-09-11 | Optical delay module and terahertz detection system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112051236A (en) |
| WO (1) | WO2022052477A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589436A (en) * | 2021-09-29 | 2021-11-02 | 首都师范大学 | Closed track optical delay module, terahertz system and photoelectric system |
| WO2022052477A1 (en) * | 2020-09-11 | 2022-03-17 | 首都师范大学 | Optical delay module and terahertz detection system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166233A (en) * | 2014-08-14 | 2014-11-26 | 天津大学 | Multi-reflecting-surface rotating optical delay line device based on involute principle |
| CN106323907A (en) * | 2016-08-09 | 2017-01-11 | 上海拓领光电科技有限公司 | Optical fiber coupling terahertz time-domain spectroscopy testing system |
| CN107748438A (en) * | 2017-11-29 | 2018-03-02 | 深圳市太赫兹科技创新研究院有限公司 | A kind of optical delay structure and device |
| CN111158139A (en) * | 2020-02-22 | 2020-05-15 | 中国工程物理研究院流体物理研究所 | Ultra-high-speed rotating prism optical fiber delay line for real-time terahertz medical imaging |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3776637A (en) * | 1972-12-14 | 1973-12-04 | United Aircraft Corp | Circular involute reflector for providing a variable pathlength |
| JP2007528613A (en) * | 2004-03-09 | 2007-10-11 | レンゼラー ポリテクニック インスティテュート | High repetition rate linear real-time optical delay line. |
| US20120273681A1 (en) * | 2011-04-26 | 2012-11-01 | Zomega Terahertz Corporation | Terahertz spectrometer |
| CN107390361A (en) * | 2017-08-02 | 2017-11-24 | 华中光电技术研究所（中国船舶重工集团公司第七七研究所） | The linear scanning means of high speed optical delay |
| CN207008189U (en) * | 2017-08-02 | 2018-02-13 | 华中光电技术研究所（中国船舶重工集团公司第七一七研究所） | A kind of linear scanning means of high speed optical delay |
| CN112051236A (en) * | 2020-09-11 | 2020-12-08 | 首都师范大学 | Optical delay module and terahertz detection system |
-
2020
- 2020-09-11 CN CN202010955081.6A patent/CN112051236A/en active Pending
-
2021
- 2021-04-26 WO PCT/CN2021/089787 patent/WO2022052477A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166233A (en) * | 2014-08-14 | 2014-11-26 | 天津大学 | Multi-reflecting-surface rotating optical delay line device based on involute principle |
| CN106323907A (en) * | 2016-08-09 | 2017-01-11 | 上海拓领光电科技有限公司 | Optical fiber coupling terahertz time-domain spectroscopy testing system |
| CN107748438A (en) * | 2017-11-29 | 2018-03-02 | 深圳市太赫兹科技创新研究院有限公司 | A kind of optical delay structure and device |
| CN111158139A (en) * | 2020-02-22 | 2020-05-15 | 中国工程物理研究院流体物理研究所 | Ultra-high-speed rotating prism optical fiber delay line for real-time terahertz medical imaging |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022052477A1 (en) * | 2020-09-11 | 2022-03-17 | 首都师范大学 | Optical delay module and terahertz detection system |
| CN113589436A (en) * | 2021-09-29 | 2021-11-02 | 首都师范大学 | Closed track optical delay module, terahertz system and photoelectric system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022052477A1 (en) | 2022-03-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112051236A (en) | Optical delay module and terahertz detection system | |
| JP2716211B2 (en) | Grating tuned laser | |
| US4554666A (en) | High-energy, single longitudinal mode hybrid laser | |
| CN113589436B (en) | Closed track optical delay module, terahertz system and photoelectric system | |
| CN111288923A (en) | Multi-mode laser scanner optical-mechanical system and equipment | |
| EP3847472A1 (en) | Polarization encoded beam delivery and collection | |
| US20070195271A1 (en) | Projection system with scanning device | |
| KR101735429B1 (en) | Mirror arrangement for guiding a laser beam in a laser system and beam guiding method for a laser beam | |
| CN111398983B (en) | Fully-electrically-controlled two-dimensional light beam scanning device | |
| CN113960570B (en) | All-solid-state laser radar scanning device and method based on wavelength tuning | |
| CN100384037C (en) | Short-pulse laser device with a preferably passive mode coupling and multiple reflection telescope therefor | |
| LU504048B1 (en) | Optical delay module and terahertz detection system | |
| US5235610A (en) | Prism gain module and method | |
| CN114905146A (en) | Intermediate infrared laser beam shaping device and method for machining special-shaped piece | |
| JP4794720B2 (en) | Laser source that filters out applied spontaneous emissions together | |
| CN114895455A (en) | High-stability optical path switching system and switching method thereof | |
| CN209803572U (en) | Novel optical machine device of two-dimensional magneto-optical trap | |
| EP1250736B1 (en) | Variable path length passive q switch | |
| CN113369674A (en) | Parallel laser processing system | |
| CN113904208A (en) | High-purity Laguerre Gaussian beam generation system and generation method thereof | |
| WO1997042595A1 (en) | Method and apparatus for illumination of light-sensitive materials | |
| CN112271542A (en) | Self-adaptive stable resonant cavity laser | |
| CN109884872B (en) | Optical machine device of two-dimensional magneto-optical trap | |
| CN216251609U (en) | Laser with adjustable wavelength | |
| CN219608217U (en) | High-speed optical path scanning device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |