CN103245613A - Focalizing system and method of divergent terahertz light source optic light path - Google Patents
Focalizing system and method of divergent terahertz light source optic light path Download PDFInfo
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Abstract
The invention relates to a focalizing system and a focalizing method of a divergent terahertz light source optic light path. According to the invention, a terahertz array detector with a real-time detection function is utilized as a signal receiving display end, two kinds of established typical optic light paths containing divergent terahertz radiation sources are focused, and according to different focusing standards, focusing operation for the divergent terahertz radiation sources is completed. The focused optic light paths comprise parallel light path focusing and converging light path focusing, wherein the parallel light path focusing mainly adopts a method that the facula is invariable by translating the terahertz array detector and the converging light path focusing finishes the focusing of the divergent terahertz light source optic light path by taking the size and the strength of the facula as the basis. The system and the method overcome the problem of difficulty in focusing of a light source in the terahertz optical system.
Description
Technical field
The present invention relates to diversity Terahertz light source optical technical field, particularly relate to focusing system and the method for diversity Terahertz light source optical beam path.
Background technology
In recent years, along with the fast development of Terahertz source and detector, the real application research of THz wave is also extensive all the more.Aspect safety detection, the Terahertz wave spectrum comprises a large amount of material characterization information, all has its special Terahertz absorption peak as drugs and TNT; At biomedical aspect, the Terahertz wave energy detects the pathology situation of epidermis biological cell, and as skin burn, skin canceration etc. can characterize by the reflective information that detects THz wave; In the material context of detection, THz wave can see through some common infrared materials that can't penetrate, as plastics, nonpolarity material such as paper and semiconductor medium, and can survey the material internal structure, simultaneously to compare to the microwave ultrasound technology higher for resolution, and this has benefited from its shorter wavelength.But no matter which kind of technology all can relate to corresponding terahertz optics system, as the near field optic microscopic system, and far-field scanning imaging system and Real Time Image System etc.Because the invisibility (with infrared different with visible light) that goes out the big and THz wave of luminous emittance in Terahertz source (solid-state source and gaseous source), make when building the terahertz optics system, to have the focus problem of difficulty of light source.
Optical system is combined by the light path of various functions and is formed, the light path constructing technology is the basis, common visible and infrared light supply has converging property of height and observability, so the focusing technology can not become difficult point (except the high-accuracy optical system) when building its corresponding optical system; But for THz wave, the Terahertz light path is built the characteristics that exist focusing difficult, and we propose a kind of light path focusing method in conjunction with the Terahertz detector array and remedy this defective at this, and this technology belongs to the optical application technical field.
Summary of the invention
Technical matters to be solved by this invention provides a kind of focusing system and method for diversity Terahertz light source optical beam path, makes that the light source focusing is oversimplified in the terahertz optics system.
The technical solution adopted for the present invention to solve the technical problems is: the focusing system that a kind of diversity Terahertz light source optical beam path is provided, comprise diversity terahertz emission source, directional light focusing system light path module, Terahertz detector array, terahertz signal demarcation display module, the terahertz signal that disperse to described directional light focusing system module in described diversity terahertz emission source; Described directional light focusing system receives the terahertz signal of described diversity Terahertz source emission, and transfers the terahertz signal that receives to parallel terahertz signal and be sent to described Terahertz detector array; The parallel terahertz signal that described Terahertz detector array will receive is demarcated display module by terahertz signal and is shown in real time, and translation Terahertz detector array is regulated described diversity terahertz emission source according to the hot spot that shows.
The emission angle in described diversity terahertz emission source is greater than 10 degree.
Described directional light focusing system light path module comprises that odd number off axis paraboloidal mirror composition has the light path system that diverging light is converted to the directional light performance.
The technical solution adopted for the present invention to solve the technical problems is: the focusing system that a kind of diversity Terahertz light source optical beam path also is provided, comprise diversity terahertz emission source, converge light focusing system light path module, Terahertz detector array, terahertz signal demarcate display module, the terahertz signal that light focusing system module is dispersed is converged to described in described diversity terahertz emission source; The described light focusing system light path module that converges converges to described Terahertz detector array with the terahertz signal of receiving; The parallel terahertz signal that described Terahertz detector array will receive is demarcated display module by terahertz signal and is shown in real time, regulates described diversity terahertz emission source according to the spot size that shows.
The described light focusing system light path module that converges comprises that the even number off axis paraboloidal mirror is formed to have diverging light is converted to the light path system that converges optical property.
The technical solution adopted for the present invention to solve the technical problems is: a kind of focusing method of diversity Terahertz light source optical beam path also is provided, may further comprise the steps:
(1) utilizes visible light source to focus in advance, demarcate the visible light source position, remove visible light source, described diversity terahertz emission source is placed the calibration position place;
(2) terahertz signal of dispersing is sent in described diversity terahertz emission source, and converts parallel terahertz signal to by the directional light focusing system, and transfers to described Terahertz detector array;
(3) the described Terahertz detector array parallel terahertz signal that will receive is demarcated display module by terahertz signal and is shown in real time, and translation Terahertz detector array is regulated the focusing position in described diversity terahertz emission source according to the hot spot that shows.
Described step (3) comprises following substep: aperture and the position of regulating the Terahertz detector array are that is that module demonstrates the Terahertz hot spot until the terahertz signal demarcation, the Terahertz detector array is fixed on the photoconduction rail two focus length place apart from the directional light focusing system, the optical axis coincidence of the array center of described Terahertz detector array and directional light focusing system, three dimension fine settings are carried out in diversity terahertz emission source, on terahertz signal demarcation display module, demonstrate the Terahertz hot spot, make the minimum or disappearance of spuious hot spot at edge, then the Terahertz detector array is moved forward and backward at the photoconduction rail, repeating above-mentioned steps to hot spot remains unchanged substantially in size and position that terahertz signal is demarcated on the display module, illustrate that then the position in diversity terahertz emission source successfully is adjusted to the focus place of directional light focusing system, namely reach the purpose to the focusing of diversity Terahertz source.
The described amplitude that the Terahertz detector array is moved forward and backward at the photoconduction rail is 0.5 times of focal length of directional light focusing system.
The technical solution adopted for the present invention to solve the technical problems is: a kind of focusing method of diversity Terahertz light source optical beam path also is provided, may further comprise the steps:
(1) utilizes visible light source to focus in advance, demarcate the visible light source position, remove visible light source, described diversity terahertz emission source is placed the calibration position place;
(2) terahertz signal of dispersing is sent in described diversity terahertz emission source, and converges to described Terahertz detector array by converging the light focusing system;
(3) described Terahertz detector array shows the terahertz signal that receives in real time by terahertz signal demarcation display module, regulates the focusing position in described diversity terahertz emission source according to the spot size that shows.
Described step (3) comprises following substep: the camera lens of Terahertz detector array is removed and placed the place, focal plane that converges the light focusing system, the array center of Terahertz detector array overlaps with the focus that converges the light focusing system, three dimension fine settings are carried out in diversity terahertz emission source, converge hot spot until demonstrating, and make and converge the facula area minimum, the edge does not have tangible spuious hot spot simultaneously, this moment, the position in diversity terahertz emission source namely was the focus of converging light focusing system, thereby reached the purpose to the focusing of diversity Terahertz source.
Beneficial effect
Owing to adopted above-mentioned technical scheme, the present invention compared with prior art, have following advantage and good effect: the present invention proposes to utilize the real-time Presentation Function of regionally detecting of Terahertz detector array, characterize the outgoing hot spot in diversity Terahertz source, oppositely regulate the position of Terahertz light source according to the hot spot situation, finish accurate focusing, thereby simplified focus process.To parallel light path system commonly used with converge light path system, this method all can be finished the focusing to diversity Terahertz light source, and effectively eliminating is focused in advance by visible light demarcates the terahertz light source position error of introducing.
Description of drawings
Fig. 1 is the structural representation of the inventive method;
Fig. 2 is the pre-focusing system light path of observability light source synoptic diagram;
Fig. 3 is directional light and converges light focusing system light path synoptic diagram.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Consult Fig. 1, a kind of focusing method about diversity Terahertz light source optical beam path that the present invention proposes, comprise: diversity terahertz emission source (solid-state quantum cascade laser), directional light focusing light path system, converge light focusing light path system, terahertz signal detector array (thermoelectron microarray detector), terahertz signal is demarcated display module.
The described diversity terahertz emission source apparatus that is positioned at is on a D translation platform, to described directional light focusing light path system or converge light focusing light path system emission terahertz signal; Described terahertz signal detector array receives the terahertz signal that send in described diversity terahertz emission source, is sent to described terahertz signal then and demarcates display module; For the directional light focusing system, as shown in Figure 3, along the mobile Terahertz detector array of emergent light axis (z direction of principal axis) of off axis paraboloidal mirror PM1, demarcate the shown situation of display module according to described terahertz signal, regulate diversity terahertz emission source to PM1 focus place; For converging the light focusing system, as shown in Figure 3, place the focal plane of off axis paraboloidal mirror PM2 to locate detector, make array center be positioned at PM2 focus place, the situation shown according to display module regulated diversity terahertz emission source to PM1 focus place.
Wherein, the described terahertz emission source of dispersing is preferably Terahertz quantum cascaded laser in the present embodiment.
Described directional light focusing light path system is preferably the light path that diverging light is converted to the directional light performance that has of odd number off axis paraboloidal mirror structure, and this system is made up of 1 off axis paraboloidal mirror PM1, as shown in Figure 3.
The described light focusing light path system that converges is preferably the even number off axis paraboloidal mirror and forms to have diverging light is converted to the light path system that converges optical property, and this system comprises off axis paraboloidal mirror PM1 and the off axis paraboloidal mirror PM2 of cooperation with it, as shown in Figure 3.
Described Terahertz detector array is preferably thermoelectron microarray detector.Normal temperature work shows that in real time speed is 8 frames/s, and the Terahertz frequency range of response is 1～7THz, the noise equivalent power～100pW at the 4.2THz place.
Described terahertz signal is demarcated display module and is preferably the intensity mode demonstration, shows Terahertz hot spot image by computer.
Further preferably, the angle of divergence of Terahertz emitting source is greater than 10 °.
Fig. 3 is for directional light in the present embodiment and converge light focusing light path system synoptic diagram, and this method specifically comprises the steps:
Step 1, utilize visible light to carry out the light path prealignment, as shown in Figure 2.
For directional light focusing light path system, regulate the optical axis of PM1, make the PM1 optical axis parallel with Z-direction.The visible light source that to disperse (adopting infrared laser+diaphragm to disperse acquisition) places the focus place of off axis paraboloidal mirror PM1, collects through PM1 and converts directional light to, and hot spot is projected on the optical baffle.Fine setting visible light source position makes to obtain uniform circular light spot at baffle plate; With the locus of probe demarcation visible light source, remove visible light source then;
For converging light focusing light path system, regulate the optical axis of PM1 and PM2 earlier, make PM1 parallel with Z-direction with the PM2 optical axis, the visible light source that to disperse (adopting infrared laser+diaphragm to disperse acquisition) places the focus place of off axis paraboloidal mirror PM1, collection converts directional light to through PM1, and is different with the directional light focusing, adopts the directional light of off axis paraboloidal mirror PM2 to converge herein, and then presenting visible light spot by optical baffle, optical baffle places PM2 focus place.Finely tune the visible light source position then, simultaneously baffle plate is moved forward and backward along optical axis (pecked line direction among Fig. 2) direction at the focus place, make on the baffle plate all rounded expansion or dwindle variation of visible light spot, the distortion in the change procedure on amorphism situations such as (and occur) oval variations; With the locus of probe demarcation visible light source, remove visible light source then.
Wherein, off axis paraboloidal mirror PM1 and PM2 all are 90 degree abaxiles, and corresponding parameter is focal length 101.6mm, and the bottom surface diameter is 50.8mm; The aperture of the diaphragm is set to 1mm, blocks to obtain the diverging light effect with filter paper, demarcates pointer and will produce the certain position error.
Step 2, the Terahertz emitting source is placed pointer position, remove pointer, light the thz laser device, and in parallel light path, place the Terahertz detector array.
For the directional light focusing system, adjusting detector array centre-height is identical with PM1 focus height, in the subsequent adjustment process, keep this highly constant, and the PM1 optical axis overlaps with array center; For converging light focusing light path system, terahertz signal detector array (removing camera lens) is placed at the place in the PM2 focal plane, and the detector array center overlaps with the PM2 focus.
Wherein, place the operation of demarcating the locus to produce certain error in the Terahertz source, make light source and PM1 focus depart from; The working temperature of Terahertz quantum cascaded laser is 10K, and driving voltage is 14.67V, and electric current is 0.39A.For the directional light focusing system, the Terahertz detector array places on the photoconduction rail parallel with the Z axle, is convenient to carry out front and back and regulates.The display frame rate of detector was 8 frame/seconds, and the Terahertz frequency range of response is 1～7THz, the noise equivalent power～100pW at the 4.2THz place.
Step 3, show in real time according to the detector array hot spot and oppositely to regulate diversity Terahertz source to the PM1 focal position.
For directional light focusing light path system, regulate detector aperture and position to demonstrating the Terahertz hot spot, detector is fixed on distance axis paraboloidal mirror two focus length place on the photoconduction rail, array center and off axis paraboloidal mirror optical axis coincidence, the Terahertz light source is carried out three dimension fine settings, on display, demonstrate the Terahertz hot spot, and the minimum or disappearance of the spuious hot spot at edge, light spot shape is decided on concrete Terahertz light source.Then detector array is moved forward and backward (amplitude is 0.5 times of focal length) at the photoconduction rail, repeating this step to size and the position of hot spot on display remains unchanged substantially, illustrate that then the terahertz light source position successfully is adjusted to off axis paraboloid mirror mirror foci place, namely reach the purpose to the focusing of diversity Terahertz source;
For converging light focusing light path system, the camera lens of detector array is removed, and place the focal plane of off axis paraboloidal mirror to locate, array center overlaps with focus, the Terahertz light source is carried out three dimension fine settings, converge hot spot and facula area minimum until demonstrating, the edge does not have tangible spuious hot spot (converging light spot shape decides on concrete Terahertz light source) simultaneously, this moment, the position in Terahertz source namely was the focus of off axis paraboloidal mirror, thereby reached the purpose to the focusing of diversity Terahertz source.
Wherein, the calibration mode of Terahertz hot spot is intensity mode, and namely gray-scale displayed or pseudo color image correspondence is the terahertz signal strength information that receives; The style characteristic of Terahertz hot spot is decided on concrete Terahertz source.
Be not difficult to find, the present invention proposes to utilize the real-time Presentation Function of regionally detecting of Terahertz detector array, characterizes the outgoing hot spot in diversity Terahertz source, oppositely regulates the position of Terahertz light source according to the hot spot situation, finish accurate focusing, thereby simplified focus process.To parallel light path system commonly used with converge light path system, this method all can be finished the focusing to diversity Terahertz light source, and effectively eliminating is focused in advance by visible light demarcates the terahertz light source position error of introducing.
Claims (10)
1. the focusing system of a diversity Terahertz light source optical beam path, comprise diversity terahertz emission source, directional light focusing system light path module, Terahertz detector array, terahertz signal demarcation display module, it is characterized in that the terahertz signal that disperse to described directional light focusing system module in described diversity terahertz emission source; Described directional light focusing system receives the terahertz signal of described diversity Terahertz source emission, and transfers the terahertz signal that receives to parallel terahertz signal and be sent to described Terahertz detector array; The parallel terahertz signal that described Terahertz detector array will receive is demarcated display module by terahertz signal and is shown in real time, and translation Terahertz detector array is regulated described diversity terahertz emission source according to the hot spot that shows.
2. the focusing system of diversity Terahertz light source optical beam path according to claim 1 is characterized in that, the emission angle in described diversity terahertz emission source is greater than 10 degree.
3. the focusing system of diversity Terahertz light source optical beam path according to claim 1 is characterized in that, described directional light focusing system light path module comprises that odd number off axis paraboloidal mirror composition has the light path system that diverging light is converted to the directional light performance.
4. the focusing system of a diversity Terahertz light source optical beam path, comprise diversity terahertz emission source, converge light focusing system light path module, Terahertz detector array, terahertz signal demarcate display module, it is characterized in that the terahertz signal that light focusing system module is dispersed is converged to described in described diversity terahertz emission source; The described light focusing system light path module that converges converges to described Terahertz detector array with the terahertz signal of receiving; The parallel terahertz signal that described Terahertz detector array will receive is demarcated display module by terahertz signal and is shown in real time, regulates described diversity terahertz emission source according to the spot size that shows.
5. the focusing system of diversity Terahertz light source optical beam path according to claim 4 is characterized in that, the described light focusing system light path module that converges comprises that the even number off axis paraboloidal mirror is formed to have diverging light is converted to the light path system that converges optical property.
6. the focusing method of a diversity Terahertz light source optical beam path is characterized in that, may further comprise the steps:
(1) utilizes visible light source to focus in advance, demarcate the visible light source position, remove visible light source, described diversity terahertz emission source is placed the calibration position place;
(2) terahertz signal of dispersing is sent in described diversity terahertz emission source, and converts parallel terahertz signal to by the directional light focusing system, and transfers to described Terahertz detector array;
(3) the described Terahertz detector array parallel terahertz signal that will receive is demarcated display module by terahertz signal and is shown in real time, and translation Terahertz detector array is regulated the focusing position in described diversity terahertz emission source according to the hot spot that shows.
7. the focusing method of diversity Terahertz light source optical beam path according to claim 6, it is characterized in that, described step (3) comprises following substep: aperture and the position of regulating the Terahertz detector array are that is that module demonstrates the Terahertz hot spot until the terahertz signal demarcation, the Terahertz detector array is fixed on the photoconduction rail two focus length place apart from the directional light focusing system, the optical axis coincidence of the array center of described Terahertz detector array and directional light focusing system, three dimension fine settings are carried out in diversity terahertz emission source, on terahertz signal demarcation display module, demonstrate the Terahertz hot spot, make the minimum or disappearance of spuious hot spot at edge, then the Terahertz detector array is moved forward and backward at the photoconduction rail, repeating above-mentioned steps to hot spot remains unchanged substantially in size and position that terahertz signal is demarcated on the display module, illustrate that then the position in diversity terahertz emission source successfully is adjusted to the focus place of directional light focusing system, namely reach the purpose to the focusing of diversity Terahertz source.
8. the focusing method of diversity Terahertz light source optical beam path according to claim 7 is characterized in that, the described amplitude that the Terahertz detector array is moved forward and backward at the photoconduction rail is 0.5 times of focal length of directional light focusing system.
9. the focusing method of a diversity Terahertz light source optical beam path is characterized in that, may further comprise the steps,
(1) utilizes visible light source to focus in advance, demarcate the visible light source position, remove visible light source, described diversity terahertz emission source is placed the calibration position place;
(2) terahertz signal of dispersing is sent in described diversity terahertz emission source, and converges to described Terahertz detector array by converging the light focusing system;
(3) described Terahertz detector array shows the terahertz signal that receives in real time by terahertz signal demarcation display module, regulates the focusing position in described diversity terahertz emission source according to the spot size that shows.
10. the focusing method of diversity Terahertz light source optical beam path according to claim 9, it is characterized in that, described step (3) comprises following substep: the camera lens of Terahertz detector array is removed and placed the place, focal plane that converges the light focusing system, the array center of Terahertz detector array overlaps with the focus that converges the light focusing system, three dimension fine settings are carried out in diversity terahertz emission source, converge hot spot until demonstrating, and make and converge the facula area minimum, the edge does not have tangible spuious hot spot simultaneously, this moment, the position in diversity terahertz emission source namely was the focus of converging light focusing system, thereby reached the purpose to the focusing of diversity Terahertz source.
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| CN103969215A (en) * | 2014-05-15 | 2014-08-06 | 中国石油大学(北京) | Terahertz time-domain spectroscopy system and measurement method thereof |
| CN104665772A (en) * | 2015-02-13 | 2015-06-03 | 上海理工大学 | All-optical fiber type device for detecting and treating superficial cancer cells |
| CN105841811A (en) * | 2016-05-23 | 2016-08-10 | 中国科学院上海微系统与信息技术研究所 | Terahertz optical path calibrator, and calibration devices for convergence and parallel optical paths |
| CN106290178A (en) * | 2016-09-08 | 2017-01-04 | 电子科技大学 | A kind of Nonuniformity Correction system and method for Terahertz detector array |
| CN107941740A (en) * | 2017-11-10 | 2018-04-20 | 深圳市太赫兹科技创新研究院有限公司 | Transflective integrating device and spectrometer system |
| WO2019091038A1 (en) * | 2017-11-10 | 2019-05-16 | 深圳市太赫兹科技创新研究院有限公司 | Transflective integrated device and spectrometer system |
| CN108734259A (en) * | 2018-05-15 | 2018-11-02 | 南京安控易创计算机科技有限公司 | A kind of point-like laser module focusing detection method and detection device |
| CN111239377A (en) * | 2020-02-21 | 2020-06-05 | 中国人民解放军第四军医大学 | System and method for researching long-term in-vitro cell terahertz biological effect |
| CN111239134A (en) * | 2020-02-26 | 2020-06-05 | 中国人民解放军第四军医大学 | System and method for researching bioelectric effect of high-frequency electromagnetic radiation on in-vitro excitable cells |
| CN111239134B (en) * | 2020-02-26 | 2022-08-26 | 中国人民解放军第四军医大学 | System and method for researching bioelectric effect of high-frequency electromagnetic radiation on in-vitro excitable cells |
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