CN211180426U

CN211180426U - Optical system for adjusting laser divergence angle

Info

Publication number: CN211180426U
Application number: CN201922011207.XU
Authority: CN
Inventors: 刘超智; 郑权; 王禹凝; 苏鑫; 王吉国; 张文彦
Original assignee: Changchun New Industries Optoelectronics Tech Co ltd
Current assignee: Changchun New Industries Optoelectronics Tech Co ltd
Priority date: 2019-11-20
Filing date: 2019-11-20
Publication date: 2020-08-04
Anticipated expiration: 2029-11-20

Abstract

The utility model discloses an optical system for adjusting laser divergence angle, which comprises a fixed flange, a rear moving lens group, a middle fixed lens group and a front moving lens group, wherein the rear moving lens group comprises a rear cam, a rear inner lens cone and a plano-concave lens; the middle fixed lens group comprises a large lens cone and a negative meniscus lens; the front moving lens group comprises a front cam, a front inner lens cone and a positive meniscus lens, and the rear moving lens group and the front moving lens group are respectively nested on the large lens cone of the middle fixed lens group and are fixed by pins. The utility model discloses can realize the regulation to big facula and high energy laser divergence angle, the laser divergence angle can be at set within range continuous variation, has effectively shortened the mechanical length of like product, has guaranteed convenience and the practicality that the product used.

Description

Optical system for adjusting laser divergence angle

Technical Field

The utility model relates to an optics field especially relates to an optical system who is used for big incident facula, high energy to adjust laser divergence angle on a large scale.

Background

Laser is increasingly expanding application fields from both breadth and depth, and gradually permeating into multiple fields of national economy. In the field of equipment manufacturing, high-power laser equipment plays an increasingly important role in cutting, welding, measuring, marking and other links in the fields of aviation, aerospace, automobile, high-speed rail, ship and other high-end equipment manufacturing.

In recent years, the demand for laser optical systems and customized production have been receiving increasing attention. The laser divergence angle needs to be adjusted in the fields of large-scale experimental optical platforms, ocean irradiation research and the like so as to obtain the optimal experimental data; in industrial processing, it is also necessary to adjust the laser divergence angle so as to obtain the optimum focusing position and processing effect. In the prior art, although the aim of changing the divergence angle of laser can be achieved by simply moving a plano-concave lens forwards and backwards, the method has the defects of overlarge overall size of optical equipment, small adjusting range and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an optical system who is used for big incident facula, high energy to adjust laser divergence angle on a large scale to prior art not enough.

In order to achieve the above purpose, the utility model discloses a technical scheme is: an optical system for adjusting the divergence angle of laser light comprises a fixed flange, a rear movable mirror group arranged at the rear end of the fixed flange, a middle fixed mirror group arranged at the rear end of the rear movable mirror group, and a front movable mirror group arranged at the rear end of the middle fixed mirror group.

The rear movable lens group comprises a rear cam, a rear inner lens cone arranged in the rear cam and a plano-concave lens arranged in the rear inner lens cone, and the rear inner lens cone is fixed on the rear cam through a pin; the middle fixed lens group comprises a large lens cone and a negative meniscus lens arranged in the large lens cone, and two thread lines are symmetrically arranged in the large lens cone; the front moving lens group comprises a front cam, a front inner lens cone arranged in the front cam and a positive meniscus lens arranged in the front inner lens cone, and the front inner lens cone is fixed on the front cam through a pin; the rear movable lens group and the front movable lens group are respectively nested on the large lens cone of the middle fixed lens group, and the rear inner lens cone and the front inner lens cone respectively advance along two thread track lines in the large lens cone and are used for realizing the precise control of the movement and the adjustment of the rear movable lens group and the front movable lens group.

Preferably, the rear moving mirror group is used for roughly adjusting the laser divergence angle, and the front moving mirror group is used for finely adjusting the laser divergence angle.

Preferably, the inner parts of the rear inner lens barrel and the front inner lens barrel are in a step-shaped shading design.

Preferably, the maximum incident single pulse energy of the laser optical system for adjusting the divergence angle is 350mJ, the maximum incident laser spot is 8mm, and the full-angle adjustment range of the laser divergence angle is 0.4-5 mrad.

The utility model discloses can realize the regulation to big facula and high energy laser divergence angle, the laser divergence angle can be at set within range continuous variation, has effectively shortened the mechanical length of like product, has guaranteed convenience and the practicality that the product used.

Drawings

Fig. 1 is an external view structural diagram of an optical system for adjusting a laser divergence angle according to the present invention.

Fig. 2 is an internal view structural diagram of an optical system for adjusting a laser divergence angle according to the present invention.

Wherein the reference numerals are: 1. the lens comprises a fixed flange, 2 parts of a rear moving lens group, 2-1 parts of a rear cam, 2-2 parts of a rear inner lens cone, 2-3 parts of a plano-concave lens, 3 parts of a middle fixed lens group, 3-1 parts of a large lens cone, 3-2 parts of a negative meniscus lens, 4 parts of a front moving lens group, 4-1 parts of a front cam, 4-2 parts of a front inner lens cone, 4-3 parts of a positive meniscus lens, 5 parts of a pin.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Referring to fig. 1-2, an optical system for adjusting a laser divergence angle includes a fixed flange 1, a rear movable lens group 2 disposed at a rear end of the fixed flange 1, a middle fixed lens group 3 disposed at a rear end of the rear movable lens group 2, and a front movable lens group 4 disposed at a rear end of the middle fixed lens group 3. The rear moving lens group 2 comprises a rear cam 2-1, a rear inner lens cone 2-2 arranged in the rear cam 2-1 and a plano-concave lens 2-3 arranged in the rear inner lens cone 2-2, wherein the rear inner lens cone 2-2 is fixed on the rear cam 2-1 through a pin 5. The middle fixed lens group 3 comprises a large lens cone 3-1, a negative meniscus lens 3-2 arranged in the large lens cone 3-1, and two thread lines are symmetrically arranged in the large lens cone 3-1. The front moving lens group 4 comprises a front cam 4-1, a front inner lens cone 4-2 arranged in the front cam 4-1 and a positive meniscus lens 4-3 arranged in the front inner lens cone 4-2, the front inner lens cone 4-2 is fixed on the front cam 4-1 through a pin 5, the size of the positive meniscus lens 4-3 is 25.4mm in diameter, and the center thickness is 3.6 mm. The rear moving lens group 2 and the front moving lens group 4 are respectively nested on the large lens cone 3-1 of the middle fixed lens group 3, the rear inner lens cone 2-2 and the front inner lens cone 4-2 respectively advance along two thread track lines in the large lens cone 3-1, and then the movement adjustment of the rear moving lens group 2 and the front moving lens group 4 is precisely controlled.

In this embodiment, the plano-concave lens 2-3 has a diameter of 12.7mm and a center thickness of 4.3mm, and the negative meniscus lens 3-2 has a diameter of 25.4mm and a center thickness of 3 mm.

In this embodiment, the inner parts of the rear inner barrel 2-2 and the front inner barrel 4-2 are designed to be stepped to shield light, so as to eliminate the influence of stray light.

When the laser focusing device is used, incident laser firstly passes through the plano-concave lens 2-3 of the rear movable lens group 2, then passes through the negative meniscus lens 3-2 of the middle fixed lens group 3, and finally passes through the positive meniscus lens 4-3 of the front movable lens group 4. The rear moving lens group 2, the front moving lens group 4 and the middle fixed group 3 have a certain central distance, the rear inner lens cone 2-2 of the rear moving lens group 2 is driven to move back and forth along the thread line in the large lens cone 3-1 by manually rotating the rear cam 2-1, the rough adjustment of the laser divergence angle is realized, the front inner lens cone 4-2 of the front moving lens group 4 is driven to move back and forth along the thread line in the large lens cone 3-1 by manually rotating the front cam 4-1, the fine adjustment of the laser divergence angle is realized, and the purpose of adjusting the laser divergence angle in a set range is further achieved.

The maximum incident single pulse energy of the optical system for adjusting the laser divergence angle is 350mJ, the maximum incident laser spot is 8mm, and the full-angle adjustment range of the laser divergence angle is 0.4-5 mrad.

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: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims

1. An optical system for adjusting a laser divergence angle, characterized in that: the device comprises a fixed flange (1), a rear movable mirror group (2) arranged at the rear end of the fixed flange (1), a middle fixed mirror group (3) arranged at the rear end of the rear movable mirror group (2), and a front movable mirror group (4) arranged at the rear end of the middle fixed mirror group (3);

the rear movable lens group (2) comprises a rear cam (2-1), a rear inner lens cone (2-2) arranged in the rear cam (2-1), and a plano-concave lens (2-3) arranged in the rear inner lens cone (2-2), wherein the rear inner lens cone (2-2) is fixed on the rear cam (2-1) through a pin (5); the middle fixed lens group (3) comprises a large lens barrel (3-1) and a negative meniscus lens (3-2) arranged in the large lens barrel (3-1), and two thread lines are symmetrically arranged in the large lens barrel (3-1); the front moving lens group (4) comprises a front cam (4-1), a front inner lens cone (4-2) arranged in the front cam (4-1), and a positive meniscus lens (4-3) arranged in the front inner lens cone (4-2), wherein the front inner lens cone (4-2) is fixed on the front cam (4-1) through a pin (5); the rear movable lens group (2) and the front movable lens group (4) are respectively nested on a large lens cone (3-1) of the middle fixed lens group (3), and the rear inner lens cone (2-2) and the front inner lens cone (4-2) respectively advance along two thread track lines in the large lens cone (3-1) to realize the precise control of the movement adjustment of the rear movable lens group (2) and the front movable lens group (4).

2. An optical system for adjusting a laser divergence angle, as set forth in claim 1, wherein: the rear moving mirror group (2) is used for roughly adjusting the laser divergence angle, and the front moving mirror group (4) is used for finely adjusting the laser divergence angle.

3. An optical system for adjusting a laser divergence angle, as set forth in claim 1, wherein: the inner parts of the rear inner lens cone (2-2) and the front inner lens cone (4-2) are in a step-shaped shading design.

4. An optical system for adjusting a laser divergence angle, as set forth in claim 1, wherein: the maximum incident single pulse energy of the laser optical system for adjusting the divergence angle is 350mJ, the maximum incident laser spot is 8mm, and the full-angle adjustment range of the laser divergence angle is 0.4-5 mrad.