CN116482852A - Annular light field telescope device and method based on refraction and diffraction mixed lens - Google Patents
Annular light field telescope device and method based on refraction and diffraction mixed lens Download PDFInfo
- Publication number
- CN116482852A CN116482852A CN202310438498.9A CN202310438498A CN116482852A CN 116482852 A CN116482852 A CN 116482852A CN 202310438498 A CN202310438498 A CN 202310438498A CN 116482852 A CN116482852 A CN 116482852A
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- China
- Prior art keywords
- refraction
- lens
- diffraction
- pinhole
- light field
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- 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
- 238000000034 method Methods 0.000 title abstract description 4
- 239000010453 quartz Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 1
- 239000000758 substrate Substances 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000005286 illumination Methods 0.000 abstract description 2
- 230000003287 optical effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004372 laser cladding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
Abstract
An annular light field telescope device and method based on refraction and diffraction mixed lens comprises a laser light source, a refraction and diffraction mixed lens and a focusing refraction lens; the laser light source irradiates the refraction and diffraction hybrid lens through beam expansion collimation, and an object side focus of the focusing refraction lens coincides with an image side focus of the refraction and diffraction hybrid lens to form the annular light field telescope. The annular light field telescope can realize the size regulation and control of output light spots through the combination of the annular refraction and diffraction mixed lens and the refraction lenses with different focal lengths, meets the annular light field requirements under different scenes, and provides a simplified scheme for the fields of annular light illumination, annular light beam transmission, laser processing and the like with variable sizes.
Description
Technical Field
The invention relates to a diffraction element, in particular to an annular light field telescope device based on a refraction and diffraction hybrid lens.
Background
The traditional telescope consists of an ocular lens and an objective lens, wherein the image space focus of the objective lens coincides with the object space focus of the ocular lens, and a distant object can be imaged at infinity. The diffraction optical element has the characteristics of light weight and thinness, has important significance for the light weight of the system, and simultaneously can regulate and control the size of the output light spot through the lens design due to the characteristics of the telescope system, and the simple and light weight structure is beneficial to realizing the research of annular light spots with different microscale, so that a simple technical scheme is provided for the fields of annular light illumination, annular light transmission, laser processing and the like with different sizes.
Disclosure of Invention
The invention aims to provide an annular light field telescope device and method based on a refraction and diffraction hybrid lens, which can output uniform parallel light beams into an annular light field by using the refraction and diffraction hybrid lens to replace an objective lens of a traditional telescope due to the characteristics of the telescope. Parallel light emitted by a laser light source is irradiated to a refraction and diffraction mixing lens after beam expansion and collimation, and then is connected with a traditional telescope eyepiece to output an annular light field.
The technical scheme of the invention is as follows:
an annular light field telescope device based on refraction and diffraction mixed lens is characterized by comprising: a laser light source (1), a refraction and diffraction mixed lens (2), a pinhole (3), a focusing refraction lens (4) and a base (5); the laser light source (1) sequentially passes through the refraction and diffraction mixing lens (2), the pinhole (3) and the focusing refraction lens (4) after beam expansion and collimation along the light path; the laser light source (1), the refraction and diffraction mixed lens (2) and the pinhole (3) focusing refraction lens (4) are arranged on the base (5), the light of the beam-expanding and collimation laser light source (1) irradiates the refraction and diffraction mixed lens (2), the refraction and diffraction mixed lens (2) is transmitted to the focusing refraction lens (4) after being positioned by the reference pinhole (3), an object side focus of the focusing refraction lens (4) coincides with an image side focus of the refraction and diffraction mixed lens (2), the pinhole (3) is positioned on the coincident focus plane, and the three form the annular light field telescope.
(1) The laser is expanded into parallel light through a microscope objective, a reference pinhole and a lens, and a light field is observed through a display screen;
(2) The parallel light incidence refraction and diffraction lens outputs an annular light field with phase difference convergence, and whether the light field has a designed annular structure or not is observed through the display screen;
(3) Placing a reference pinhole on an image side focal plane of the refraction and diffraction hybrid lens, and adjusting the reference pinhole so that a converged annular light field passes through the reference pinhole to obtain a divergent annular light field for filtering most of stray light after the reference pinhole;
(4) The rear focusing refraction lens is used for observing whether the size of a far light field after the focusing refraction lens accords with the size of a designed telescope system or not, so that an object side focus of the lens coincides with an image side focus of the refraction and diffraction mixed lens, and a parallel annular light field with a phase difference is obtained.
Compared with the prior art, the invention has the beneficial effects that
1) Obtaining a parallel annular light field with a phase difference, and compared with the existing output annular light field technology, additionally introducing the phase difference of an outer ring and an inner ring;
2) The device has the characteristics of simple structure, simple and easy adjustment, and can regulate and control the size of the output light spot only by designing the focal length ratio of the annular refraction and diffraction mixed lens and the refraction and refraction lens.
Drawings
FIG. 1 is a light path diagram used in the present invention, wherein the dashed box is a ring-shaped light field telescope device based on a refractive-diffractive hybrid lens;
in the figure, a 1-laser light source, a 2-refraction and diffraction mixed lens, a 3-reference pinhole, a 4-focusing refraction lens and a 5-fixed base are shown;
FIG. 2 shows the front and back structures of the 2-refractive hybrid lens used in example 1, wherein one side of the refractive hybrid lens is a convex lens, the other side is etched along inner and outer rings, the phase difference at the working wavelength is pi, and the radius ratio of the inner and outer rings is 0.571;
FIG. 3 is a double optical path for observing interference fringes of the annular light field telescope based on the refractive and diffractive hybrid lens in embodiment 1, wherein the annular light field telescope based on the refractive and diffractive hybrid lens in embodiment 1 is shown in a dashed line;
fig. 4 is an interference pattern (white straight line is an auxiliary line in the figure, and misplaced interference fringes indicate that the inner and outer annular light fields have phase difference) acquired by the annular light field telescope based on the refraction and diffraction hybrid lens in case 1 in a double-light-path CCD.
Detailed Description
The invention is further described below with reference to the drawings and examples, which should not be taken to limit the scope of the invention.
Referring to fig. 1, fig. 1 is a light path diagram adopted by the present invention, wherein a dashed line frame is an annular light field telescope device based on a refractive and diffractive hybrid lens, and as can be seen from the figure, the annular light field telescope device based on the refractive and diffractive hybrid lens of the present invention is characterized by comprising a laser light source 1, a refractive and diffractive hybrid lens 2, a reference pinhole 3, a focusing refractive lens 4 and a base 5. The laser light source 1, the refraction and diffraction mixed lens 2, the reference pinhole 3 and the focusing refraction lens 4 are all fixed on the base 5 and are adjusted to be aligned with the optical axis through the reference pinhole. The laser output by the laser source 1 is uniformly irradiated on the refraction and diffraction mixed lens 2 through a beam expander, meanwhile, the image side focal point of the refraction and diffraction mixed lens 2 is overlapped with the object side focal point of the focusing refraction lens 4, and the two focal planes are adjusted to be overlapped at the pinhole position through the assistance of a reference pinhole.
In example 1:
for a ring-shaped light field commonly used for laser cladding, a laser light source 1, a refractive and diffraction mixed lens 2 with a focal length of 175mm and a caliber of 20mm, a pinhole 3 with a diameter of 45 mu m and a focusing and refracting lens 4 with a focal length of 100mm and a caliber of 25.4mm are fixed on a base 5, and are adjusted to be flush with an optical axis through the pinhole with the diameter of 45 mu m. The laser wavelength is consistent with the working wavelength of the refraction and diffraction mixed lens 2.
The installation process is as follows:
1) Installing a beam expander on the optical path, and adjusting the beam expander to expand the light beam;
2) The refraction and diffraction mixed lens 2 used in the present case is placed behind the beam expansion collimation of the laser light source 1, see fig. 3, the refraction and diffraction mixed lens comprises a beam splitter, the beam splitter is used for dividing the transmitted light and the reflected light, the transmitted light direction is sequentially provided with a first objective lens, a first pinhole, a first lens, a first reflecting mirror and a beam combiner, and the reflected light direction is sequentially provided with a second reflecting mirror, a second objective lens, a second pinhole, a second lens, the refraction and diffraction mixed lens 2, a reference pinhole, a focusing refraction lens 3, a beam combiner and a CCD; (FIG. 2 is a diagram showing the structure of a refractive/diffractive hybrid lens according to embodiment 1, and the dashed box is a circular light field telescope based on the refractive/diffractive hybrid lens according to the present invention)
3) Selecting a pinhole (corresponding to a pinhole element with the diameter of 45 μm in the present case) with the size of 1.5-2 times of the focal spot, and placing the pinhole on the focal plane of the refraction and diffraction hybrid lens 2, namely, the position 175mm behind the refraction and diffraction hybrid lens 2, and judging by observing the light field change behind the pinhole: when the focal spot can pass completely through the aperture, a clean annular light field can be observed;
4) Overlapping the object side focus of the focusing refraction lens 3 with the image side focus of the refraction and diffraction mixed lens;
5) The annular light field telescope device based on the refraction and diffraction mixed lens is built in a double-light-path as shown in fig. 3 to observe diffraction patterns, because the annular light field introduces phase modulation, the inner and outer circles of the obtained annular light field have different phases, and the phase difference causes dislocation of interference fringes, as shown in fig. 4.
Claims (3)
1. An annular light field telescope device based on refraction and diffraction mixed lens is characterized by comprising: a laser light source (1), a refraction and diffraction mixed lens (2), a pinhole (3), a focusing refraction lens (4) and a base (5); the laser light source (1) sequentially passes through the refraction and diffraction mixing lens (2), the pinhole (3) and the focusing refraction lens (4) after beam expansion and collimation along the light path; the laser light source (1), the refraction and diffraction mixed lens (2) and the pinhole (3) focusing refraction lens (4) are arranged on the base (5), the light of the beam-expanding and collimating laser light source (1) irradiates the refraction and diffraction mixed lens (2), and the refraction and diffraction mixed lens (2) is transmitted to the focusing refraction lens (4) after being positioned by the reference pinhole (3). The object side focal point of the focusing refraction lens (4) is overlapped with the image side focal point of the refraction and diffraction mixed lens (2), the pinhole (3) is positioned on the overlapped focal plane, and the three components form the annular light field telescope.
2. The annular light field telescope device based on the refraction and diffraction mixed lens according to claim 1, wherein one surface of the refraction and diffraction mixed lens (2) on a planar quartz substrate is a convex lens, the other surface is etched along an inner ring and an outer ring, the phase difference under the working wavelength is pi, and the radius ratio of the inner ring and the outer ring is 0.571.
3. The device according to claims 1-2, characterized in that it is chosen whether to filter stray light using a pinhole comparable to the focal spot size, while ensuring that most of the energy passes through the pinhole, depending on whether the system exit light field noise meets the use requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310438498.9A CN116482852A (en) | 2023-04-23 | 2023-04-23 | Annular light field telescope device and method based on refraction and diffraction mixed lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310438498.9A CN116482852A (en) | 2023-04-23 | 2023-04-23 | Annular light field telescope device and method based on refraction and diffraction mixed lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116482852A true CN116482852A (en) | 2023-07-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310438498.9A Pending CN116482852A (en) | 2023-04-23 | 2023-04-23 | Annular light field telescope device and method based on refraction and diffraction mixed lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116482852A (en) |
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2023
- 2023-04-23 CN CN202310438498.9A patent/CN116482852A/en active Pending
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