CN213399086U

CN213399086U - Large-zoom-ratio multi-wavelength laser shaping beam expanding collimating lens

Info

Publication number: CN213399086U
Application number: CN202022544402.1U
Authority: CN
Inventors: 张曦元; 顾姗姗; 赵春竹
Original assignee: Jilin Chunxi Photoelectric Technology Co ltd
Current assignee: Jilin Chunxi Photoelectric Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-06-08
Anticipated expiration: 2030-11-06

Abstract

The utility model discloses a big zoom ratio multi-wavelength laser plastic beam expanding collimating lens relates to the optical lens field, solves the requirement that photoelectric instrument needs heavy-calibre, multi-wavelength, the collimation is good, the even incident light source of energy distribution. The lens is provided with a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a diaphragm, a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with negative focal power and an eighth lens with positive focal power in sequence from an object side to an image side; the convex surface of the first lens and the convex surface of the third lens are both even-order aspheric surfaces. The utility model discloses big zoom ratio multi-wavelength laser shaping beam expanding collimating lens makes the degree of consistency of the light beam of exitting have very showing improvement, has solved the colour difference problem that multi-wavelength probably leads to, can be the flat top light beam with the radial gaussian beam shaping of different beam waists to keep the flat top to distribute in longer range.

Description

Large-zoom-ratio multi-wavelength laser shaping beam expanding collimating lens

Technical Field

The utility model relates to an optical lens field especially relates to a big zoom ratio multi-wavelength laser plastic beam expanding collimating lens.

Background

Lasers are a common light source used in modern optical instruments. The laser exit spot is typically on the order of a few microns and the energy distribution is gaussian. For large-scale photoelectric instrument detection, an incident light source is often required to have a large caliber, uniformly distributed energy and good collimation. Therefore, the research and development of a laser shaping beam expanding collimating lens with a large zoom ratio is a problem to be solved urgently at present. Meanwhile, the shaping beam expanding and collimating lens has good performance under multiple laser wavelengths so as to meet the application requirements of different laser wavelengths.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a big zoom ratio multi-wavelength laser plastic beam expanding collimating lens.

The utility model discloses a solve the technical scheme that technical problem adopted as follows:

the multi-wavelength laser shaping beam expanding and collimating lens with the large zoom ratio comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power, a diaphragm, a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with negative focal power and an eighth lens with positive focal power which are sequentially arranged from an object side to an image side; the convex surface of the first lens and the convex surface of the third lens are both even-order aspheric surfaces; the first lens and the second lens form a double cemented lens, the third lens and the fourth lens form a double cemented lens, the fifth lens and the sixth lens form a double cemented lens, and the seventh lens and the eighth lens form a double cemented lens; the lens shapes, expands and collimates the Gaussian beam emitted by the laser into a flat-top beam with uniform intensity of the required beam aperture.

Further, the laser is a laser which emits continuous laser light with various visible or near infrared wavelengths.

Further, the beam expansion ratio of the lens is larger than 10.

The utility model has the advantages that:

the utility model discloses a big zoom ratio multi-wavelength laser shaping beam expanding collimating lens, the convex surface through first lens and third lens all is the even aspheric surface, can be fine carry out the plastic to the gaussian beam. And then, the first lens and the second lens are combined to form a cemented lens, the third lens and the fourth lens form a cemented lens, the fifth lens and the sixth lens form a cemented lens, and the seventh lens and the eighth lens form a cemented lens, so that chromatic aberration caused by a spherical system and a multi-wavelength structure can be well corrected. The optical system of the large-zoom multi-wavelength shaping collimation beam expanding lens based on the combination design of the aspheric surface and the spherical surface has the advantages that the uniformity of an emergent light beam is remarkably improved, and the chromatic aberration problem possibly caused by multi-wavelength is solved by using the cemented lens. The utility model discloses use less lens piece number, only three kinds of optical material, can be with the radial gaussian beam plastic of different beam waist for the flat top light beam to keep the flat top to distribute in longer range. The incident light source has the advantages of large aperture, multiple wavelengths, uniform energy distribution and good collimation, is suitable for large-scale photoelectric instrument detection, has good performance under multiple laser wavelengths, and meets the application requirements of different laser wavelengths.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

Fig. 1 is the embodiment of the utility model provides a big multiple wavelength shaping beam expanding collimating lens's that becomes times optical structure chart.

Fig. 2 is the embodiment of the utility model provides a light path diagram of big multiple wavelength plastic beam expanding collimating lens that becomes times.

Fig. 3 is an incident relative illuminance diagram of the large zoom multi-wavelength shaping beam expanding collimating lens provided by the embodiment of the present invention.

Fig. 4 is an exit relative illuminance diagram of the multi-wavelength shaping beam expanding collimating lens with a large zoom ratio when the wavelength is 1064nm according to an embodiment of the present invention.

Fig. 5 is an exit relative illuminance diagram of the multi-wavelength shaping beam expanding collimating lens with a large zoom ratio when the wavelength is 1331nm according to an embodiment of the present invention.

Fig. 6 is the embodiment of the utility model provides a big zoom multi-wavelength shaping beam expanding collimating lens's outgoing relative illumination map when wavelength is 1550 nm.

Description of reference numerals:

1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a diaphragm; 6. a fifth lens; 7. a sixth lens; 8. a seventh lens.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

As shown in fig. 1-2, the utility model provides a big zoom ratio multi-wavelength laser plastic beam expanding collimation lens, along the optical axis from the object space to the image space in proper order arranged have positive focal power first lens 1, have negative focal power second lens 2, have positive focal power third lens 3, have positive focal power fourth lens 4, diaphragm 5, have negative focal power fifth lens 6 and have negative focal power sixth lens 7, have negative focal power seventh lens 8 and have positive focal power eighth lens 9; the convex surface of the first lens 1 and the convex surface of the third lens 3 are both even aspheric surfaces, the second lens 2, the fourth lens 4, the fifth lens 6, the sixth lens 7, the seventh lens 8 and the eighth lens 9 are spherical lenses, the first lens 1 and the second lens 2 form a cemented lens, the third lens 3 and the fourth lens 4 form a cemented lens, the fifth lens 6 and the sixth lens 7 form a cemented lens, and the seventh lens 8 and the eighth lens 9 form a cemented lens. The Gaussian beam emitted by the laser is shaped, expanded and collimated into a flat-top beam with uniform intensity and a required beam aperture through the lenses.

According to the technical scheme of the embodiment, four groups of cemented lenses are arranged, so that the correction of the multi-wavelength chromatic aberration of the system is facilitated; by matching the spherical lens and the aspheric lens, the laser beam shaping and large-zoom beam expanding collimation can be realized.

In this embodiment, the aperture of an incident beam of the large-zoom multi-wavelength shaping beam expanding and collimating lens is 2mm, the aperture of an emergent beam is 30mm, and the total length is 303.914 mm. The surface type, radius of curvature, thickness, refractive index, and abbe constant of each surface of all lenses from the object side (OBJ) to the image side (IMA) of the lens are shown in table 1.

TABLE 1 relevant parameters for each face of all lenses

In the above table, STO corresponds to the stop 5,

surface numbers

2 and 3 correspond to the first lens 1,

surface numbers

3 and 4 correspond to the second lens 2,

surface numbers

5 and 6 correspond to the third lens 3,

surface numbers

6 and 7 correspond to the fourth lens 4, surface numbers 9 and 10 correspond to the fifth lens 6, surface numbers 10 and 11 correspond to the sixth lens 7, surface numbers 12 and 13 correspond to the seventh lens 8, and surface numbers 13 and 14 correspond to the eighth lens 9.

The aspherical surface coefficients of the respective mirror surfaces are shown in table 2. TABLE 2 aspherical coefficients of the mirror

E stands for scientific notation.

Meanwhile, the formula of the even-order aspheric mirror surface in the embodiment satisfies:

in the above formula: h represents the Y-axis coordinate value of each point on the lens surface; c is the reciprocal of the radius of curvature r of the lens surface; k is the conic coefficient, a₁、a₂、a₃、a₄、a₅、a₆Is a high-order aspheric system; z is a distance vector height from the aspheric surface vertex at a position having a height h in the optical axis direction of the aspheric surface.

The utility model discloses a laser instrument be the laser instrument of the continuous laser of the visible or near-infrared multiple wavelength of emergence, the incident relative illuminance of big multiple wavelength plastic beam expanding collimating lens of zooming is shown in fig. 3, when the wavelength is 1064nm, the emergent relative illuminance of big multiple wavelength plastic beam expanding collimating lens of zooming is shown in fig. 4, when the wavelength is 1331nm, the emergent relative illuminance of big multiple wavelength plastic beam expanding collimating lens of zooming is shown in fig. 5, when the wavelength is 1550nm, the emergent relative illuminance of big multiple wavelength plastic beam expanding collimating lens of zooming is shown in fig. 6. Therefore, the Gaussian beam with uneven intensity distribution emitted from the laser is shaped into a flat-top beam with uniform collimation distribution after passing through the large-zooming multi-wavelength shaping beam-expanding collimating lens, so that the high efficiency of energy transmission is realized, and the beam expanding ratio of the lens is more than 10.

The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments, but such modifications or substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The multi-wavelength laser shaping beam expanding and collimating lens with the large zoom ratio is characterized in that a first lens (1) with positive focal power, a second lens (2) with negative focal power, a third lens (3) with positive focal power, a fourth lens (4) with positive focal power, a diaphragm (5), a fifth lens (6) with negative focal power, a sixth lens (7) with negative focal power, a seventh lens (8) with negative focal power and an eighth lens (9) with positive focal power are sequentially arranged from an object side to an image side; the convex surface of the first lens (1) and the convex surface of the third lens (3) are both even aspheric surfaces; the first lens (1) and the second lens (2) form a double-cemented lens, the third lens (3) and the fourth lens (4) form a double-cemented lens, the fifth lens (6) and the sixth lens (7) form a double-cemented lens, and the seventh lens (8) and the eighth lens (9) form a double-cemented lens; the lens shapes, expands and collimates the Gaussian beam emitted by the laser into a flat-top beam with uniform intensity of the required beam aperture.

2. The large zoom ratio multi-wavelength laser shaping, beam expanding and collimating lens of claim 1, wherein the laser is a laser emitting continuous laser light of visible or near infrared multiple wavelengths.

3. The large zoom ratio multi-wavelength laser shaping, beam expanding and collimating lens of claim 1, wherein the beam expanding ratio of the lens is greater than 10.