CN108181699A - A kind of big visual field modulates opal optical system close to the reverse of diffraction limit - Google Patents
A kind of big visual field modulates opal optical system close to the reverse of diffraction limit Download PDFInfo
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- CN108181699A CN108181699A CN201711377422.0A CN201711377422A CN108181699A CN 108181699 A CN108181699 A CN 108181699A CN 201711377422 A CN201711377422 A CN 201711377422A CN 108181699 A CN108181699 A CN 108181699A
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- lens
- optical system
- opal
- reverse
- diffraction limit
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/005—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having spherical lenses only
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/0005—Optical objectives specially designed for the purposes specified below having F-Theta characteristic
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a kind of reverse modulation opal optical systems, using six spherical mirrors of simple easy processing, Parameters Optimal Design is passed through according to specific demand, big visual field be can obtain close to the reverse modulation opal optical system of diffraction limit, ensure that there is good modulation effect to the light beam of big incidence angle；It is close to diffraction limit simultaneously, ensure that the good backtracking characteristic of system；It also assures that F numbers are small, can realize and match with small size modulator, ensure that the modulation contrast of whole system, there is preferable link stability；It in addition, this system also has the advantages that wavefront distortion is small, encircled energy is good, therefore, can be widely applied to inversely modulate the field of laser communication, there is small, strong applicability, at low cost.
Description
Technical field
The invention belongs to technology of Free-space Laser Communication fields, and in particular to a kind of big visual field is close to the inverse of diffraction limit
To modulation opal optical system.
Background technology
Reverse modulation opal optical system is reception/transmitting antenna of reverse modulator, determines that its opal is inversely modulated
The gain of device, performance are directly related to the stability of reverse modulator link, have weight to structure high-rate laser communication network
Want meaning.Reasonably inversely modulation opal optical system is the key that the reverse modulator of opal to design structure.Big visual field ensure that
Optical system has good modulation effect to the light beam of big incidence angle, ensure that the good former road of system is returned close to diffraction limit
Return characteristic, based on this, the present invention devises big visual field close to the reverse modulation opal optical system of diffraction limit.It is external at present right
Mainly there are the U.S. and Sweden in the country that opal Optical System Design is studied, research department of USN devises refraction type and spreads out
Emitter-base bandgap grading limits opal optical system, and 30 ° of the system field angle, focal plane size 1.4cm, effective F numbers are F/2.Sweden's defence research
Administration devises a reverse modulation opal optical system, realizes bore 12mm, and effective focal plane length is 13.3mm, field angle
18°.But the two optical systems lead to high costs, processing difficulties, are unfavorable for making extensively using aspherical mirror structure
With.The country is concentrated mainly on influence of the optical system parameter to chatoyancy reflective light intensity for the research of opal optical system,
There has been no practicality reports for the contents such as the design for opal optical system.
Invention content
In view of this, the object of the present invention is to provide a kind of big visual field opal optical system is modulated close to the reverse of diffraction limit
System, under conditions of spherical mirror of all eyeglasses using simple easy processing, moreover it is possible to so that system has simultaneously close to diffraction pole
Limit, the characteristics of big visual field and F numbers are small.
A kind of reverse modulation opal optical system, including set gradually from object plane to image planes along optical axis the first lens (1),
Second lens (2), third lens (3), the 4th lens (4), the 5th lens (5) and the 6th lens (6), the third lens (3)
And the 4th setting diaphragm (7) between lens (4), all lens are spherical lens, and material is glass；
First lens (1) are platycelous lens, and the second lens 2 are lenticular lens, and third lens 3 are positive curved month type
Lens, the 4th lens (4) are negative meniscus lens, and the 5th saturating 5 is lenticular lens, and the 6th lens (6) are positive meniscus lens；
The focal length of six-element lens is respectively negative, positive, positive and negative, just, just.
Preferably, the field angle of the optical system is at least 30 °, and F numbers are up to 1.3.
Preferably, the material of six-element lens is H-ZF7LA.
Preferably, six-element lens is coated with high transmittance film.
The present invention has the advantages that：
The reverse modulation opal optical system of the present invention, using six spherical mirrors of simple easy processing, according to specific need
It asks through Parameters Optimal Design, can obtain big visual field close to the reverse modulation opal optical system of diffraction limit, ensure to entering greatly
The light beam of firing angle has good modulation effect；It is close to diffraction limit simultaneously, ensure that the good backtracking characteristic of system；
Also assure that F numbers are small, can realize and match with small size modulator, ensure that the modulation contrast of whole system, have compared with
Good link stability；In addition, this system also has the advantages that wavefront distortion is small, encircled energy is good, it therefore, can extensive use
In the field of inversely modulation laser communication, there is small, strong applicability, at low cost.
Description of the drawings
Fig. 1 is the structure diagram of big visual field of the invention close to the reverse modulation opal optical system of diffraction limit.
Fig. 2 is ray tracing schematic diagram of the big visual field of the present invention close to the reverse modulation opal optical system of diffraction limit.
Fig. 3 is that the MTF of opal optical system of the present invention schemes.
Wherein, the first lens of 1-, the second lens of 2-, 3- third lens, the 4th lens of 4-, the 5th lens of 5-, 6- the 6th are saturating
Mirror, 7- diaphragms.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present invention cannot meet that big visual field, reversible, F numbers be small and all mirrors simultaneously to solve existing reverse modulation optical system
Piece is using the condition of the spherical mirror of simple easy processing, it is proposed that a set of opal optical system structure close to diffraction limit.
As illustrated in fig. 1 and 2, big visual field of the invention is mainly wrapped close to the reverse modulation opal optical system of diffraction limit
Include the first lens 1 being arranged in order along the incident direction of light, the second lens 2, third lens 3, the 4th lens the 4, the 5th thoroughly
Aperture diaphragm 7 is set between mirror 5, the 6th lens 6, wherein 3 and the 4th lens 4 of third lens, it is flat by front and rear group of camera lens adjustment
Weigh off-axis aberration.All lens are spherical lens, and material is glass.First lens 1 are platycelous lens；This second thoroughly
Mirror 2 is lenticular lens；The third lens 3 are positive meniscus lens；4th lens 4 are negative meniscus lens；5th thoroughly
Mirror 5 is lenticular lens；6th lens 6 are positive meniscus lens；The focal length of six-element lens is respectively negative, positive, it is positive and negative, just,
Just.
The parameter of more than optical system can be realized according to specific demand by Parameters Optimal Design big visual field and
Close to diffraction limit；Finally so that the opal optical system realizes that, close to 30 ° of big field angles, F numbers are 1.3, and all lens are
Spherical mirror.
The object plane side of the big visual field of invention close to the first lens of reverse modulation opal optical system 1 of diffraction limit is recessed
Face, image planes side are plane.
The reverse modulation opal optical system of the big visual field of the present invention close to diffraction limit is designing its bore as 50mm, full
While sufficient designing gain requirement, full filed angle reaches 30 °, and good retro-reflective properties are kept in entire field angle.
According to optical imaging concept and the imaging requirements to system, in the case where 1550nm is using wavelength condition, lens material is the system
H-ZF7LA, system focal length 26mm, system Entry pupil diameters are 20mm, and F numbers are 1.3, and imaging surface diameter 13.4mm, overall length is less than
80mm, communication distance 1km, system after reflection at one kilometer half image height size near 267 meters.Since light beam can pass through reflection
Eyeglass is again introduced into system, therefore the monolithic eyeglass of system requires transmitance higher in plated film.System amounts to 6 12 faces,
System transmitance is higher than 94%.
It is the structural parameters of the optical system embodiment below.
Table 1
As shown in figure 3, the MTF curve figure for the optical system, it can be seen that the biography letter curve of system difference visual field is basic
Close to diffraction limit.The biography letter curve of the system can meet the resolution requirement of 2.5 μm of detector pixel dimension.The system is to slow
Slowly the background changed and coarse object are by being imaged than more visible, to also having outstanding performance in terms of object resolve minutiae ability.
Existing reverse modulation opal optical system is mostly using aspherical mirror, and cost of manufacture is high, processing difficulties, and the present invention uses
The standard spherical mirror of handling ease, effectively reduces system cost, is conducive to be widely used.
The reverse opal optical system of modulating of the present invention is close to diffraction limit, while gain requirement is met, full filed
Angle reaches 30 °, and good retro-reflective properties are kept in entire field angle.
In conclusion the foregoing is merely a prefered embodiment of the invention, it is not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in the present invention's
Within protection domain.
Claims (4)
1. a kind of reverse modulation opal optical system, which is characterized in that including set gradually from object plane to image planes along optical axis the
One lens (1), the second lens (2), third lens (3), the 4th lens (4), the 5th lens (5) and the 6th lens (6), described
Diaphragm (7) is set between three lens (3) and the 4th lens (4), and all lens are spherical lens, and material is glass；
First lens (1) are platycelous lens, and the second lens 2 are lenticular lens, and third lens 3 are saturating for positive curved month type
Mirror, the 4th lens (4) are negative meniscus lens, and the 5th saturating 5 is lenticular lens, and the 6th lens (6) are positive meniscus lens；Six
The focal lengths of piece lens is respectively negative, positive, positive and negative, just, just.
2. reverse modulation opal optical system as described in claim 1, which is characterized in that the field angle of the optical system is at least
It it is 30 °, and F numbers are up to 1.3.
3. reverse modulation opal optical system as claimed in claim 1 or 2, which is characterized in that the material of six-element lens is H-
ZF7LA。
4. reverse modulation opal optical system as claimed in claim 1 or 2, which is characterized in that six-element lens is coated with high saturating
Film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711377422.0A CN108181699B (en) | 2017-12-19 | 2017-12-19 | Reverse modulation cat eye optical system with large field of view approaching diffraction limit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711377422.0A CN108181699B (en) | 2017-12-19 | 2017-12-19 | Reverse modulation cat eye optical system with large field of view approaching diffraction limit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108181699A true CN108181699A (en) | 2018-06-19 |
| CN108181699B CN108181699B (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711377422.0A Active CN108181699B (en) | 2017-12-19 | 2017-12-19 | Reverse modulation cat eye optical system with large field of view approaching diffraction limit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022142250A1 (en) * | 2020-12-30 | 2022-07-07 | 武汉华工激光工程有限责任公司 | Objective lens for correcting distribution state of optical focus points in beam propagation direction |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4813773A (en) * | 1987-01-22 | 1989-03-21 | Asahi Kogaku Kogyo Kabushiki Kaisha | Copying zoom lens |
| CN102478706A (en) * | 2010-11-22 | 2012-05-30 | 佳能企业股份有限公司 | Zoom lens |
| CN104252031A (en) * | 2013-06-25 | 2014-12-31 | 三星电机株式会社 | Lens module |
| US20160216486A1 (en) * | 2015-01-27 | 2016-07-28 | Fujifilm Corporation | Imaging lens and imaging apparatus equipped with the imaging lens |
| US20160274339A1 (en) * | 2015-03-18 | 2016-09-22 | Samsung Electronics Co., Ltd. | Super-wide angle lens and photographing lens having the same |
-
2017
- 2017-12-19 CN CN201711377422.0A patent/CN108181699B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4813773A (en) * | 1987-01-22 | 1989-03-21 | Asahi Kogaku Kogyo Kabushiki Kaisha | Copying zoom lens |
| CN102478706A (en) * | 2010-11-22 | 2012-05-30 | 佳能企业股份有限公司 | Zoom lens |
| CN104252031A (en) * | 2013-06-25 | 2014-12-31 | 三星电机株式会社 | Lens module |
| US20160216486A1 (en) * | 2015-01-27 | 2016-07-28 | Fujifilm Corporation | Imaging lens and imaging apparatus equipped with the imaging lens |
| US20160274339A1 (en) * | 2015-03-18 | 2016-09-22 | Samsung Electronics Co., Ltd. | Super-wide angle lens and photographing lens having the same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022142250A1 (en) * | 2020-12-30 | 2022-07-07 | 武汉华工激光工程有限责任公司 | Objective lens for correcting distribution state of optical focus points in beam propagation direction |
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| Publication number | Publication date |
|---|---|
| CN108181699B (en) | 2020-10-30 |
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