CN208126029U - A kind of OCT optics 4f beam-expanding system based on gradual index lens - Google Patents
A kind of OCT optics 4f beam-expanding system based on gradual index lens Download PDFInfo
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- CN208126029U CN208126029U CN201820726582.5U CN201820726582U CN208126029U CN 208126029 U CN208126029 U CN 208126029U CN 201820726582 U CN201820726582 U CN 201820726582U CN 208126029 U CN208126029 U CN 208126029U
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Abstract
The utility model discloses a kind of OCT optics 4f beam-expanding system based on gradual index lens, is related to optical technical field.Including rear end light system, beam-expanding system and front end light system are placed on the left of the rear end light system, beam-expanding system includes gradient index optical fiber collimator, short focal length lens, confocal point and long-focus lens, the output end of rear end light system is fixedly connected with gradient index optical fiber collimator, is placed with short focal length lens on the left of gradient index optical fiber collimator.The OCT optics 4f beam-expanding system based on gradual index lens, by the way that gradient index optical fiber collimator is arranged, it can make the light beam collimated light beam of its output and effectively improve the coupling efficiency of the system, it ensure that the signal-to-noise ratio of the system is not affected, by the way that short focal length lens is arranged, under the action of long-focus lens, the output beam diameter of the system can be made to become larger, solve the problems, such as the too small influence system lateral resolution of gradual index lens bore.
Description
Technical field
The utility model relates to optical technical field, specially a kind of OCT optics 4f based on gradual index lens expands
Beam system.
Background technique
Optical coherent chromatographic imaging is the new three-dimension layer of one kind made of gradually developing the 1990s referred to as " OCT "
Imaging technique is analysed, OCT obtains the chromatography ability of depth direction based on low coherence interference principle, can go out biology by scanning with weeping willow
The two dimension or 3-D image of tissue or material internal structure, signal contrast are derived from biological tissue or material internal optical reflection
The spatial variations of characteristic, the core component of the imaging pattern include wideband light source, Michelson's interferometer and photodetector,
Axial resolution depends on the coherence length of wideband light source, generally can achieve 1-10 microns, and radial resolving power and normal light
It is similar to learn microscope, is decided by the size of sample interior focal beam spot, generally also in micron dimension, OCT has non-contact, non-invade
Enter, the advantages that image taking speed is fast, detectivity is high, currently, OCT technology obtains in clinic diagnosis and scientific research
It is widely applied.
It is more special that OCT Tomography requires the optical system of front end, and general scanning imaging optical system is logical
Often include illumination path and imaging optical path, for example infrared ophthalmoscope, is copolymerized burnt Fundus laser scanning etc., and the illumination of OCT image
A set of optical path is shared with signal capture, signal is coupled back into fibre system through gradient index optical fiber collimator, therefore, collimation
The coupling efficiency of device is extremely important for the signal-to-noise ratio of OCT image, and the existing common collimator of OCT system is short focus aspheric
Face lens, for bore generally between 2-4 millimeters, the advantage of non-spherical lens collimator is thicker collimated light beam output, can
To bring better lateral resolution to system, but its coupling efficiency is general, can have an impact to the signal-to-noise ratio of system, thus I
Propose a kind of OCT optics 4f beam-expanding system based on gradual index lens.
Utility model content
The purpose of this utility model is exactly in order to make up for the deficiencies of the prior art, to provide a kind of saturating based on graded index
The OCT optics 4f beam-expanding system of mirror, it has the advantages that coupling efficiency is high and does not influence system lateral resolution, solves existing
The problem of OCT system coupling efficiency generally has an impact the signal-to-noise ratio of system.
The utility model is in order to solve the above technical problems, provide the following technical solutions：One kind being based on gradual index lens
OCT optics 4f beam-expanding system, including rear end light system, be placed on the left of the rear end light system beam-expanding system and before
Hold light system.
The beam-expanding system includes gradient index optical fiber collimator, short focal length lens, confocal point and long-focus lens, described
The output end of rear end light system is fixedly connected with gradient index optical fiber collimator, the left side of the gradient index optical fiber collimator
It is placed with short focal length lens, the object focus of the short focal length lens is confocal point, is placed on the left of the short focal length lens
Long-focus lens.
The front end light system includes the first light beam, the second light beam, third light beam and the 4th light beam, the rear end light
The output after gradient index optical fiber collimator collimation of the light of system transmitting is the first horizontal light beam, first light beam
Parallel across exporting the second light beam after short focal length lens, and the second light beam is collected to confocal point far from one end of short focal length lens
Place, the confocal point is emitted as third light beam to the left, after the third light beam passes through long-focus lens far from confocal one end
Output is the 4th light beam being in a horizontal state.
Further, the focal length value of the long-focus lens is four times of the focal length value of short focal length lens, the long-focus
Focus is overlapped the rear focus of lens together.
By using above-mentioned technical proposal, it can fully ensure that the diameter value of the 4th light beam is the four of the diameter value of the first light beam
Times, third light beam can be made to be projected on long-focus lens completely.
Further, the collimation lens in the gradient index optical fiber collimator is gradual index lens, the gradual change
The bore of index lens is greater than 0.5 millimeter.
By using above-mentioned technical proposal, return signal can be made to be coupled to fibre system by gradual index lens,
The coupling efficiency of the system is sufficiently improved, the diameter value of the 4th light beam of the system can be made to be at least 2 millimeters, it should to meet
The lateral resolution requirement of system.
Further, the horizontal plane where the long-focus lens center line and the level where short focal length lens center line
Face is located at same level height, the horizontal plane where the short focal length lens center line and gradient index optical fiber collimator center line
The horizontal plane at place is located at same level height.
By using above-mentioned technical proposal, it can fully ensure that the 4th light beam remains horizontality, can effectively guarantee
Confocal point can drop down on the horizontal plane where short focal length lens center line.
Compared with prior art, it is somebody's turn to do the OCT optics 4f beam-expanding system based on gradual index lens and has following beneficial effect
Fruit：
1, by setting gradient index optical fiber collimator, the light beam collimated light beam that it can be made to export exports the utility model
And the system coupling efficiency reliably improves, and adequately ensure that the signal-to-noise ratio of the system image is not affected, it is short by being arranged
Focal length lenses export after the diameter of the first light beam can be made to increase from the left side of long-focus lens under the action of long-focus lens,
Solves the problems, such as the too small influence system lateral resolution of gradual index lens bore.
2, the utility model be short focal length lens by the way that the focal length value of long-focus lens is arranged four times of focal length value, can fill
The diameter value of code insurance the 4th light beam of card is four times of the diameter value of the first light beam, by the way that the rear focus of long-focus lens is arranged together
Focus is overlapped, and third light beam can be made to be projected on long-focus lens completely, passes through the standard in setting gradient index optical fiber collimator
Straight lens are gradual index lens, and return signal can be made to be coupled to fibre system by gradual index lens, sufficiently mentioned
The coupling efficiency of the high system, the bore by the way that gradual index lens are arranged are greater than 0.5 millimeter, can make the 4th of the system
The diameter value of light beam is at least 2 millimeters, to meet the lateral resolution requirement of the system, by the way that long-focus lens center is arranged
The horizontal plane where horizontal plane and short focal length lens center line where line is located at same level height, can fully ensure that the 4th light
Beam remains horizontality, by the horizontal plane and gradient index optical fiber collimator where setting short focal length lens center line
Horizontal plane where heart line is located at same level height, where capable of effectively guaranteeing that confocal point can drop down onto short focal length lens center line
Horizontal plane on.
Detailed description of the invention
Fig. 1 is that Tthe utility model system arranges organigram；
Fig. 2 is the utility model short focal length lens working principle diagram；
Fig. 3 is the utility model long-focus lens working principle diagram.
In figure：The rear end 1- light system, 2- beam-expanding system, 201- gradient index optical fiber collimator, 202- short focal length lens,
The confocal point of 203-, 204- long-focus lens, the front end 3- light system, the first light beam of 301-, the second light beam of 302-, 303- third light
Beam, the 4th light beam of 304-.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1-3 is please referred to, the utility model provides a kind of technical solution：A kind of OCT light based on gradual index lens
4f beam-expanding system is learned, including rear end light system 1, the left side of rear end light system 1 are placed with beam-expanding system 2 and front end light system
System 3.
Beam-expanding system 2 includes that gradient index optical fiber collimator 201, short focal length lens 202, confocal point 203 and long-focus are saturating
Mirror 204, the output end of rear end light system 1 are fixedly connected with gradient index optical fiber collimator 201, gradient index optical fiber collimator
201 left side is placed with short focal length lens 202, and the object focus of short focal length lens 202 is confocal point 203, short focal length lens 202
Left side be placed with long-focus lens 204.
Front end light system 3 includes the first light beam 301, the second light beam 302, third light beam 303 and the 4th light beam 304, after
The light for holding light system 1 to emit output after the collimation of gradient index optical fiber collimator 201 is the first horizontal light beam
301, the first light beam 301 is parallel across exporting the second light beam 302 after short focal length lens 202, and the second light beam 302 is far from short focus
One end of lens 202 is collected at confocal point 203, and confocal point 203 is emitted as third light beam 303 to the left, and third light beam 303 is separate
Output is the 4th light beam 304 being in a horizontal state after one end of confocal point 203 passes through long-focus lens 204.
Further, the focal length value of long-focus lens 204 is four times of the focal length value of short focal length lens 202, can sufficiently be protected
The diameter value for demonstrate,proving the 4th light beam 304 is four times of diameter value of the first light beam 301, the rear focus of long-focus lens 204 with it is confocal
Point 203 is overlapped, and third light beam 303 can be made to be projected on long-focus lens 204 completely.
Further, the collimation lens in gradient index optical fiber collimator 201 is gradual index lens, can to return
Signal is coupled to fibre system by gradual index lens, sufficiently improves the coupling efficiency of the system, gradual index lens
Bore be greater than 0.5 millimeter, the diameter value of the 4th light beam 304 of the system can be made to be at least 2 millimeters, to meet the system
Lateral resolution requirement.
Further, the horizontal plane where 204 center line of long-focus lens and the water where 202 center line of short focal length lens
Plane is located at same level height, can fully ensure that the 4th light beam 304 remains horizontality, 202 center of short focal length lens
The horizontal plane where horizontal plane and 201 center line of gradient index optical fiber collimator where line is located at same level height, can have
The confocal point 203 of guarantee of effect can drop down on the horizontal plane where 202 center line of short focal length lens.
Working principle：Rear end light system 1 is docked with gradient index optical fiber collimator 201, rear end light system 1 emits
Diverging light through gradient index optical fiber collimator 201 collimation after, light ray parallel pass through 202 post-concentration coke of short focal length lens altogether
In focus 203, due to the rear focus focus coincidence together of long-focus lens 204, so the light that the confocal point 203 emits passes through
After long-focus lens 204, through 204 exiting parallel of long-focus lens, since the focal length of long-focus lens 204 is short focal length lens
4 times of 202, therefore the beam diameter value that long-focus lens 204 exports is the 4 of the beam diameter value that short focal length lens 202 inputs
Times, since the bore of gradual index lens is greater than 0.5 millimeter, so the output beam of long-focus lens 204 i.e. the 4th light beam
At least 2 millimeters, it can be realized and the light beam of output is carried out to expand 4 times i.e., at least 2 millimeters, and use gradual index lens
The coupling efficiency of fiber coupling is effectively guaranteed for the collimation lens of optical fiber collimator, has not only fully ensured that the cross of the system
Coupling efficiency that is unaffected to resolution ratio and improving the system increases the system signal noise ratio (snr) of image.
The terms "include", "comprise" or its any other variant are intended to non-row in the description of the present invention,
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence " including a reference structure ", it is not excluded that wrapping
Include in the process, method, article or equipment of the element that there is also other identical elements.It should be noted that herein
In, the relational terms of such as " first ", " second " or the like be used merely to by an entity or operation with another entity or
Operation distinguishes, without necessarily requiring or implying between these entities or operation there are any this actual relationship or
Sequentially.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (4)
1. a kind of OCT optics 4f beam-expanding system based on gradual index lens, including rear end light system (1), feature exists
In：Beam-expanding system (2) and front end light system (3) are placed on the left of the rear end light system (1)；
The beam-expanding system (2) include gradient index optical fiber collimator (201), short focal length lens (202), confocal point (203) and
The output end of long-focus lens (204), the rear end light system (1) is fixedly connected with gradient index optical fiber collimator (201),
It is placed with short focal length lens (202) on the left of the gradient index optical fiber collimator (201), the short focal length lens (202)
Object focus is confocal point (203), is placed with long-focus lens (204) on the left of the short focal length lens (202)；
The front end light system (3) includes the first light beam (301), the second light beam (302), third light beam (303) and the 4th light
Beam (304), the light of the rear end light system (1) transmitting after gradient index optical fiber collimator (201) collimation output in
Horizontal the first light beam (301), first light beam (301) export the second light beam parallel across short focal length lens (202) afterwards
(302), and the second light beam (302) is collected at confocal point (203) far from the one end of short focal length lens (202), the confocal point
(203) it is emitted as to the left third light beam (303), the third light beam (303) passes through long-focus far from one end of confocal point (203)
The 4th light beam (304) that lens (204) are exported afterwards to be in a horizontal state.
2. a kind of OCT optics 4f beam-expanding system based on gradual index lens according to claim 1, feature exist
In：The focal length value of the long-focus lens (204) is four times of the focal length value of short focal length lens (202), the long-focus lens
(204) focus (203) is overlapped rear focus together.
3. a kind of OCT optics 4f beam-expanding system based on gradual index lens according to claim 1, feature exist
In：Collimation lens in the gradient index optical fiber collimator (201) is gradual index lens, the gradual index lens
Bore be greater than 0.5 millimeter.
4. a kind of OCT optics 4f beam-expanding system based on gradual index lens according to claim 1, feature exist
In：The horizontal plane position where horizontal plane and short focal length lens (202) center line where long-focus lens (204) center line
In where same level height, short focal length lens (202) center line horizontal plane and gradient index optical fiber collimator (201)
Horizontal plane where center line is located at same level height.
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| CN201820726582.5U CN208126029U (en) | 2018-05-16 | 2018-05-16 | A kind of OCT optics 4f beam-expanding system based on gradual index lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108388016A (en) * | 2018-05-16 | 2018-08-10 | 北京图湃影像科技有限公司 | A kind of OCT optics 4f beam-expanding systems based on gradual index lens |
| CN113237850A (en) * | 2021-04-29 | 2021-08-10 | 广州永士达医疗科技有限责任公司 | Optical fiber collimator for OCT (optical coherence tomography), manufacturing method and OCT equipment |
-
2018
- 2018-05-16 CN CN201820726582.5U patent/CN208126029U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108388016A (en) * | 2018-05-16 | 2018-08-10 | 北京图湃影像科技有限公司 | A kind of OCT optics 4f beam-expanding systems based on gradual index lens |
| CN113237850A (en) * | 2021-04-29 | 2021-08-10 | 广州永士达医疗科技有限责任公司 | Optical fiber collimator for OCT (optical coherence tomography), manufacturing method and OCT equipment |
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Address after: 100192 203, unit a, building 2, Tiandi Linfeng Innovation Industrial Park, Haidian District, Beijing Patentee after: Tupai (Beijing) Medical Technology Co.,Ltd. Address before: 100192 203, unit a, building 2, Tiandi Linfeng Innovation Industrial Park, Haidian District, Beijing Patentee before: BEIJING TOPI IMAGING TECHNOLOGY Co.,Ltd. |
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