CN210404329U

CN210404329U - Laser device

Info

Publication number: CN210404329U
Application number: CN201921526323.9U
Authority: CN
Inventors: 黄汉凯; 邓剑钦; 张大鹏
Original assignee: ADVANCED FIBER RESOURCES (ZHUHAI) Ltd
Current assignee: ADVANCED FIBER RESOURCES (ZHUHAI) Ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-04-24
Anticipated expiration: 2029-09-09

Abstract

The utility model provides a laser instrument, include along the light path direction be provided with collimator, first beam splitter, revolve light, half-wave plate, second beam splitter, negative lens and positive lens, the center pin of collimator and the optical axis of first beam splitter, the output contained angle is greater than 0 degree and is less than 90 degrees. Due to the material dispersion of the first beam splitter and the second beam splitter, there is a slight deviation between the laser light and the indicator light after the light is combined by the second beam splitter of the isolator, and the deviation is amplified by the combination of the negative lens and the positive lens, which affects the working precision and quality. Therefore, by designing a small included angle between the light path of the indicating light output from the collimator and the light path of the laser, after the indicating light is transmitted to the positive lens, the indicating light and the laser are just overlapped, so that the deviation between the laser and the indicating light is reduced, the indicating light and the laser are nearly coaxially output from the positive lens, and the operation precision and the operation quality can be improved.

Description

Laser device

Technical Field

The utility model relates to an optical device field especially relates to a laser instrument.

Background

In the system of fiber laser marking, cutting, welding and the like, because 1064nm laser is invisible light, 650nm visible light red light is commonly used as an indicating light path, thereby realizing positioning operation. The indicating light of the optical fiber laser marking is generally coupled into the optical fiber through WDM of a laser system, and the signal laser and the indicating light are output from a beam expanding lens of an isolator and then focused through a vibrating lens and a field lens. Because of the dispersion of the isolator crystal material, the problem of non-alignment generally exists between the 650nm indicating red light output from the isolator and the 1064nm laser, and the indicating light positioning has errors, which brings great inconvenience to users.

Referring to fig. 1, fig. 1 is a schematic optical path diagram of a conventional laser, the laser is provided with a collimator 11, a first light splitting crystal 12, a faraday rotator 13, a half-wave plate 14 and a second light splitting crystal 15 along an optical path, the first light splitting crystal 12, the faraday rotator 13, the half-wave plate 14 and the second light splitting crystal 15 constitute an isolator, the collimator 11 outputs laser light L1 of 1064nm invisible light and indicator light L2 of 650nm visible light to the first light splitting crystal 12, and finally outputs laser light L1 and indicator light L2 to the second light splitting crystal 15.

It can be seen that because of the dispersion problem of the crystal material of the isolator, the problem of non-alignment generally exists between the 650nm indication red light output from the isolator and the 1064nm laser, so that the operation position of the laser and the marking position of the red light are not overlapped, and the operation precision and the operation quality are affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an instruction light and laser instrument of laser coaxial output.

In order to realize the utility model discloses the purpose, the utility model provides a laser instrument, include along the light path direction and be provided with collimator, first beam splitter, revolve light, half-wave plate, second beam splitter, negative lens and positive lens, the center pin of collimator and the optical axis of first beam splitter, the output contained angle is greater than 0 degree and is less than 90 degrees.

According to a further scheme, the collimator is provided with an invisible light output light path and a visible light output light path, the invisible light output light path and the visible light output light path are arranged in a light path included angle, and the light path included angle is arranged in an acute angle.

According to a further scheme, the collimator comprises a tail fiber and a C lens, the output end face of the tail fiber is parallel to and opposite to the input end face of the C lens, and the output end face of the tail fiber and the direction perpendicular to the output direction form an included angle of 3-8 degrees.

In a further scheme, the output end surface of the C lens is arranged in a cambered surface.

Further, the negative lens is a biconcave lens.

In a further aspect, the positive lens is a plano-convex lens, the plane of the plano-convex lens is opposite the negative lens, and the convex surface of the plano-convex lens and the plane of the plano-convex lens are on opposite sides.

According to the scheme, the laser and the indicating light slightly deviate in the transmission of the isolator, so that the output direction of the collimator and the direction of the light path are arranged in an output included angle through the inclined output setting of the collimator, the output included angle is larger than 0 degree and smaller than 90 degrees, the light path is combined and processed by the negative lens and the positive lens, the deviation between the laser and the indicating light is reduced, the approximately coaxial output of the indicating light and the laser is realized, and the operation precision and the operation quality can be improved. And the arrangement of the output included angle is related to the inherent light path included angle of the collimator, so that the coaxial output stability can be further improved.

Drawings

Fig. 1 is an optical path diagram of a laser in the prior art.

Fig. 2 is an optical diagram of an embodiment of the laser of the present invention.

Fig. 3 is a first optical path schematic diagram of a positive and negative lens in an embodiment of the laser of the present invention.

Fig. 4 is a second optical path schematic diagram of the positive and negative lenses in the laser embodiment of the present invention.

Fig. 5 is a schematic diagram of an optical path of a collimator in an embodiment of the laser of the present invention.

Fig. 6 is a schematic diagram of an output angle of a collimator in an embodiment of the laser of the present invention.

Fig. 7 is a schematic optical path diagram of a negative lens and a positive lens in an embodiment of the laser of the present invention.

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

Detailed Description

Referring to fig. 2, the laser includes a collimator 21, a first beam splitter 22, an optical rotator 23, a half-wave plate 24, a second beam splitter 25, a negative lens 26, and a positive lens 27 arranged along the optical path direction X, the faraday rotator is used for optical rotation, YOV4 crystals are used for the first beam splitter and the second beam splitter, and the first beam splitter, the optical rotator, the half-wave plate, and the second beam splitter constitute an isolator.

The negative lens 26 is a biconcave lens, the positive lens 27 is a plano-convex lens, the plane of the plano-convex lens is opposite to the negative lens 26, and the convex surface of the plano-convex lens and the plane of the plano-convex lens are on opposite sides.

Referring to fig. 6 in combination with fig. 5 and 2, the collimator 21 includes a pigtail 211 and a C lens 212, in practical application, in order to improve the return loss of the device, an output end surface of the pigtail 211 is parallel to and opposite to an input end surface of the C lens 212, an output end surface of the C lens 212 is arranged in an arc surface, an output end surface of the pigtail 211 forms an angle of 8 degrees with a direction perpendicular to the output direction Y, of course, an angle of 3 degrees to 8 degrees, or an angle of 5 degrees is adopted, due to material dispersion, signal light output by the collimator often has a slight angle β with the indicating light, the collimator 21 has an invisible light output light path L1 and a visible light output light path L2, an angle of light path β is also formed between the invisible light output light path and the visible light output light path, an angle β is set at an acute angle, and a central axis X1 of the collimator 21 and an optical axis X2 of the first light splitter 22 are arranged in an angle α, an output α is greater than 0 degree and less than 90 degrees, and an angle of light output 6324 is formed by transmitting a negative optical path 26, a half-wave beam splitter 26, a half-wave lens 26, a half.

Referring to fig. 3, a principle of an optical path of the positive and negative lenses is explained, and it is known from geometrical optics that a deviation d between the signal light L1 and the indicating light L2 which are parallel to each other is obtained, and after passing through the beam expander with a magnification of N, that is, after passing through the negative lens and the positive lens, the deviation between the signal light output from the beam expander and the indicating light is amplified by N times, as shown in fig. 3.

Referring to fig. 4, another optical path principle of the positive and negative lenses is explained, when the angle between the signal light and the indicator light is α, and after passing through the beam expander with the magnification factor N, that is, after passing through the negative lens and the positive lens, the angle between the signal light and the indicator light output by the beam expander is reduced by N times, as shown in fig. 4.

Referring to fig. 7 in conjunction with fig. 6 and 2, based on the above-mentioned optical path principle, the collimator 21 is arranged to form an output included angle α oblique to the optical path direction X, after the signal light L1 and the indicating light L2 sequentially pass through the first beam splitter 22, the optical rotator 23, the half-wave plate 24, the second beam splitter 25, the negative lens 26 and the positive lens 27, the deviation degree between the signal light L1 and the indicating light L2 is reduced, and in practical application, the angle α between the signal light output by the collimator and the indicating light is generally small, so that the angle between the signal light and the indicating light is reduced and then output almost in parallel.

As can be seen from the above, due to the material dispersion of the first beam splitter and the second beam splitter, the laser light and the indicating light have a slight deviation after the light is combined by the second beam splitter of the isolator, and the deviation is amplified by the combination of the negative lens and the positive lens, which affects the operation precision and quality. Therefore, by designing a small included angle between the light path of the indicating light output from the collimator and the light path of the laser, after the indicating light is transmitted to the positive lens, the indicating light and the laser are just overlapped, so that the deviation between the laser and the indicating light is reduced, the indicating light and the laser are nearly coaxially output from the positive lens, and the operation precision and the operation quality can be improved.

Claims

1. The laser is characterized by comprising a collimator, a first light splitting piece, a light rotating piece, a half-wave plate, a second light splitting piece, a negative lens and a positive lens which are arranged along the direction of a light path;

the central shaft of the collimator and the optical axis of the first light splitting component are arranged in an output included angle, and the output included angle is larger than 0 degree and smaller than 90 degrees.

2. The laser of claim 1, wherein:

the collimator has invisible light output light path and visible light output light path, invisible light output light path with be the light path contained angle between the visible light output light path and arrange, the light path contained angle is the acute angle setting.

3. The laser of claim 2, wherein:

the collimator includes tail fiber and C lens, the output terminal surface of tail fiber with the input terminal surface parallel and the relative arrangement of C lens, the output terminal surface and the perpendicular to of tail fiber the output direction is 3 degrees to 8 degrees contained angles.

4. The laser of claim 3, wherein:

the output end surface of the C lens is arranged in an arc surface.

5. The laser according to any one of claims 1 to 4, wherein:

the negative lens is a biconcave lens.

6. The laser of claim 5, wherein:

the positive lens adopts a plano-convex lens, the plane of the plano-convex lens is opposite to the negative lens, and the convex surface of the plano-convex lens is positioned on two opposite sides of the plane of the plano-convex lens.