Switching device for high and low space coherence laser light sources

Abstract

The utility model relates to the technical field of optical devices, and particularly discloses a high-low space coherence laser light source switching device which comprises a laser transmitter, and a collimating lens is arranged on one side of the laser transmitter. The galvanometer is located on one side of the collimating lens, and the mirror surface of the galvanometer is obliquely arranged relative to the horizontal line; the microscope objective is located on one side of the galvanometer, and the axis of the microscope objective is parallel to the horizontal line; the frosted glass is positioned on one side of the microscope objective, and the end surface of the frosted glass is parallel to the mirror surface of the microscope objective; the axial line of the collimating lens and the light source ray of the laser transmitter are on the same straight line; a light source of the laser transmitter forms a first optical axis through the collimating lens, and laser rays on the first optical axis are reflected to the microscope objective and the ground glass through the galvanometer. According to the utility model, the selective output of point light beams with high spatial coherence or annular light beams with low spatial coherence can be realized, the cost is saved, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical devices, and particularly relates to a switching device for a laser source with high and low spatial coherence. Background Art

[0002] As a standard light source for an interferometer, laser has good spatial coherence. However, the good spatial coherence will cause the laser to scatter at the defects (such as dust, depressions, scratches, etc.) of the optical elements in the interference system, generating coherent noise, and then forming Newton rings or bull's-eyes locally in the interference pattern, reducing the signal-to-noise ratio of the system. For this reason, experts and scholars use a low spatial coherence light source (such as a white light source, etc.) to replace it to reduce the spatial coherence.

[0003] Currently, the following problems still need to be improved in the existing technology: in some application scenarios, such as coherence tomography, etc., the light source is still required to have high spatial coherence. The separately set light source cannot meet the requirements of outputting low spatial coherence and high spatial coherence beams at the same time. Setting two light sources at the same time will increase the cost, and the replacement and debugging of the light source require time, reducing the work efficiency. Summary of the Utility Model

[0004] To solve the above problems existing in the prior art, the utility model provides a switching device for a laser source with high and low spatial coherence, which can selectively output a point beam with high spatial coherence or an annular beam with low spatial coherence of the device, save costs and improve work efficiency.

[0005] The purpose of the utility model can be achieved by the following technical solutions:

[0006] A switching device for a laser source with high and low spatial coherence, comprising: a laser emitter, and a collimating lens is arranged on one side of the laser emitter;

[0007] A galvanometer mirror, the galvanometer mirror is located on one side of the collimating lens, and the mirror surface of the galvanometer mirror is inclined with respect to the horizontal line;

[0008] A microscope objective lens, the microscope objective lens is located on one side of the galvanometer mirror, and the axis of the microscope objective lens is parallel to the horizontal line;

[0009] A ground glass, the ground glass is located on one side of the microscope objective lens, and the end face of the ground glass is parallel to the mirror surface of the microscope objective lens.

[0010] Preferably, the axial line of the collimating lens and the light source ray of the laser emitter are on the same straight line.

[0011] Preferably, the light source of the laser emitter forms a first optical axis through the collimating lens, the laser rays on the first optical axis are reflected by the galvanometer to the microscope objective lens and the frosted glass, and the galvanometer and the rays on the microscope objective lens and the frosted glass form a second optical axis.

[0012] Preferably, the frosted glass is provided with a frosted surface and a smooth surface, and the frosted surface of the frosted glass faces the microscope objective lens.

[0013] Preferably, the laser beam received by the frosted glass is a point beam, and the point beam is located at the intersection of the second optical axis and the frosted glass.

[0014] Preferably, a rotating motor is fixedly connected to one side of the galvanometer. When the rotating motor drives the galvanometer to rotate at high speed, the galvanometer is displaced. The propagation angle of the laser beam after reflection by the galvanometer deviates from the horizontal. The laser beam received by the frosted glass is an annular beam, and the center of the annular beam is the intersection of the second optical axis and the frosted glass.

[0015] Preferably, the laser emitter is used to emit a laser beam with high spatial coherence, the collimating lens is used to receive the laser beam emitted by the laser emitter, the galvanometer is used to reflect the laser beam passing through the collimating lens, the microscope objective is used to receive the laser beam reflected by the galvanometer, and the frosted glass is used to receive the laser beam passing through the microscope objective.

[0016] Preferably, the microscope objective lens is used to receive the laser beam reflected by the galvanometer, and the frosted glass is used to receive the laser beam passing through the microscope objective lens.

[0017] The beneficial effects of the utility model are:

[0018] The frosted glass is provided with a frosted surface and a smooth surface. The frosted surface of the frosted glass faces the microscope objective lens, which is convenient for homogenizing the light field. The frosted glass is set to be rotatable. Rotating the frosted glass can further reduce the spatial coherence of the light source, which is helpful for switching between high and low spatial coherence of the light source.

[0019] The device uses the stationary and high-speed rotation of the galvanometer mirror 3 to achieve the selective output of a point beam with high spatial coherence or a ring beam with low spatial coherence. When the galvanometer mirror is stationary, it acts as a plane reflector, and the point beam with high spatial coherence is finally focused on the frosted glass. When the galvanometer mirror rotates at high speed, the galvanometer mirror is displaced, and the propagation angle of the laser beam after reflection by the galvanometer mirror deviates from the horizontal, and finally forms a ring beam with low spatial coherence on the frosted glass. The structures are tightly matched, and there is no need to replace the light source, which saves costs and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] For the convenience of those skilled in the art to understand, the following further describes the present utility model in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0022] Figure 2 It is a schematic diagram of the change in the propagation angle of the laser beam when the rotating motor in the present utility model drives the galvanometer to rotate at high speed;

[0023] Figure 3 It is a schematic diagram of the point beam with high spatial coherence and the annular beam with low spatial coherence in the present utility model;

[0024] Main element symbol description:

[0025] In the figure: 1. Laser emitter; 101. First optical axis; 102. Second optical axis; 2. Collimating lens; 3. Galvanometer; 4. Microscope objective; 5. Ground glass; 6. Annular beam; 7. Point beam; 8. Rotating motor. Specific implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application; obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0027] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0029] Refer to Figures 1 to 3The utility model discloses a switching device for high and low spatial coherence laser light sources, comprising: a laser emitter 1, a collimating lens 2 is provided on one side of the laser emitter 1; a galvanometer 3, the galvanometer 3 is located on one side of the collimating lens 2, and the mirror surface of the galvanometer 3 is inclined compared to the horizontal line; a microscope objective lens 4, the microscope objective lens 4 is located on one side of the galvanometer 3, and the axis of the microscope objective lens 4 is parallel to the horizontal line; and a frosted glass 5, the frosted glass 5 is located on one side of the microscope objective lens 4, and the end face of the frosted glass 5 is parallel to the mirror surface of the microscope objective lens 4.

[0030] Reference Figures 1 to 3 The axial line of the collimating lens 2 is in the same straight line as the light source ray of the laser emitter 1; the light source of the laser emitter 1 forms a first optical axis 101 through the collimating lens 2, and the laser ray on the first optical axis 101 is reflected by the galvanometer 3 to the microscope objective lens 4 and the frosted glass 5, and the galvanometer 3, the microscope objective lens 4 and the rays on the frosted glass 5 form a second optical axis 102.

[0031] Reference Figures 1 to 3 The frosted glass 5 is provided with a frosted surface and a smooth surface. The frosted surface of the frosted glass 5 faces the microscope objective lens 4, which is convenient for homogenizing the light field. In this embodiment, the frosted glass 5 is rotatable. Rotating the frosted glass 5 can further reduce the spatial coherence of the light source, which is helpful for switching between high and low spatial coherence of the light source; the laser beam received by the frosted glass 5 is a point beam 7, and the point beam 7 is located at the intersection of the second optical axis 102 and the frosted glass 5.

[0032] Reference Figures 1 to 3 A rotating motor 8 is fixedly connected to one side of the galvanometer 3. When the rotating motor 8 drives the galvanometer 3 to rotate at high speed, the galvanometer 3 is displaced. The propagation angle of the laser beam after reflection by the galvanometer 3 deviates from the horizontal. The laser beam received by the frosted glass 5 is an annular beam 6, and the annular beam 6 takes the intersection of the second optical axis 102 and the frosted glass 5 as the center.

[0033] The device realizes the selective output of a point light beam 7 with high spatial coherence or an annular light beam 6 with low spatial coherence by the stationary and high-speed rotation of the galvanometer mirror 3. When the galvanometer mirror 3 is stationary, it acts as a plane reflector, and the point light beam 7 with high spatial coherence is finally focused on the frosted glass 5. When the galvanometer mirror 3 rotates at high speed, the galvanometer mirror 3 is displaced, and the propagation angle of the laser beam after reflection by the galvanometer mirror 3 deviates from the horizontal, and finally forms an annular light beam 6 with low spatial coherence on the frosted glass 5. The structures are tightly matched, and there is no need to replace the light source, which saves costs and improves work efficiency.

[0034] Reference Figures 1 to 3, the laser emitter 1 is used to emit a laser beam with high spatial coherence, the collimating lens 2 is used to receive the laser beam emitted by the laser emitter 1, the galvanometer 3 is used to reflect the laser beam passing through the collimating lens 2, the microscope objective 4 is used to receive the laser beam reflected by the galvanometer 3, and the ground glass 5 is used to receive the laser beam passing through the microscope objective 4; the microscope objective 4 is used to receive the laser beam reflected by the galvanometer 3, and the ground glass 5 is used to receive the laser beam passing through the microscope objective 4.

[0035] The working principle and usage process of the present utility model: When a laser light source with high spatial coherence is required, turn on the laser emitter 1, and the laser beam passes through the collimating lens 2 to the galvanometer 3. At this time, the galvanometer 3 is used as a plane mirror, and the galvanometer 3 reflects the laser beam to the microscope objective 4. The laser beam passes through the microscope objective 4 and is focused on the ground glass 5, forming a point beam 7 at the intersection of the second optical axis 102 and the ground glass 5.

[0036] When a laser light source with low spatial coherence is required, start the rotating motor 8. The rotating motor 8 drives the galvanometer 3 to rotate at a high speed. Turn on the laser emitter 1, and the laser beam passes through the collimating lens 2 to the galvanometer 3. At this time, the galvanometer 3 generates a displacement, and the propagation angle of the laser beam after reflection by the galvanometer 3 deviates from the horizontal. The galvanometer 3 reflects the laser beam to the microscope objective 4. The laser beam passes through the microscope objective 4 and is focused on the ground glass 5, forming an annular beam 6 centered on the intersection of the second optical axis 102 and the ground glass 5.

[0037] The above is only a preferred embodiment of the present utility model and does not impose any form of limitation on the present utility model. Although the present utility model has been disclosed as above with a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form an equivalent embodiment with equivalent changes within the scope of the technical solution of the present utility model. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modification, equivalent change and modification made to the above embodiment based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A switching device for high and low spatial coherence laser light sources, characterized in that: include: A laser emitter (1), wherein a collimating lens (2) is provided on one side of the laser emitter (1); A galvanometer mirror (3), the galvanometer mirror (3) is located on one side of the collimating lens (2), and the mirror surface of the galvanometer mirror (3) is tilted relative to the horizontal line; A microscope objective lens (4), the microscope objective lens (4) is located on one side of the galvanometer mirror (3), and the axis of the microscope objective lens (4) is parallel to the horizontal line; A frosted glass (5), the frosted glass (5) is located on one side of the microscope objective lens (4), and the end surface of the frosted glass (5) is parallel to the mirror surface of the microscope objective lens (4).

2. The switching device for high and low spatial coherence laser light sources according to claim 1, characterized in that: The axial line of the collimating lens (2) and the light source ray of the laser emitter (1) are on the same straight line.

3. The switching device for high and low spatial coherence laser light sources according to claim 1, characterized in that: The light source of the laser emitter (1) forms a first optical axis (101) through the collimating lens (2), and the laser rays on the first optical axis (101) are reflected by the galvanometer (3) to the microscope objective lens (4) and the frosted glass (5), and the galvanometer (3) and the rays on the microscope objective lens (4) and the frosted glass (5) form a second optical axis (102).

4. The switching device for high and low spatial coherence laser light sources according to claim 1, characterized in that: The frosted glass (5) is provided with a frosted surface and a smooth surface, and the frosted surface of the frosted glass (5) faces the microscope objective lens (4).

5. The switching device for high and low spatial coherence laser light sources according to claim 3, characterized in that: The laser beam received by the frosted glass (5) is a point beam (7), and the point beam (7) is located at the intersection of the second optical axis (102) and the frosted glass (5).

6. The switching device for high and low spatial coherence laser light sources according to claim 3, characterized in that: A rotating motor (8) is fixedly connected to one side of the galvanometer (3). When the rotating motor (8) drives the galvanometer (3) to rotate at a high speed, the galvanometer (3) is displaced. The propagation angle of the laser beam reflected by the galvanometer (3) deviates from the horizontal. The laser beam received by the frosted glass (5) is an annular beam (6). The center of the annular beam (6) is the intersection of the second optical axis (102) and the frosted glass (5).

7. The switching device for high and low spatial coherence laser light sources according to claim 6, characterized in that: The laser emitter (1) is used to emit a laser beam with high spatial coherence, the collimating lens (2) is used to receive the laser beam emitted by the laser emitter (1), the galvanometer (3) is used to reflect the laser beam passing through the collimating lens (2), the microscope objective lens (4) is used to receive the laser beam reflected by the galvanometer (3), and the frosted glass (5) is used to receive the laser beam passing through the microscope objective lens (4).

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