A method of laser cutting a prism

Abstract

The embodiment of the application belongs to the field of laser processing and relates to a method for laser cutting a prism. The method for laser cutting the prism comprises the following steps: placing a prism body on a platform, taking one side of the prism body capable of covering all side surfaces as an incident surface, and making the incident surface face a first laser; adjusting a laser focal length of the first laser and processing parameters; setting a required first cutting path of the prism body, with the starting point of the first cutting path being an axis of the prism body; controlling a laser beam emitted by the first laser to move along the first cutting path, cutting the prism body, and separating a prism product from the prism body. When the first laser cuts the prism body, even if the laser incident to the side surface of the prism body is reflected to irradiate another side surface, the part not cut by the first laser will not be cut, so that the first laser can cut the other side of the prism body, the cutting end surface of the prism body and the prism product is flat, and the cutting efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laser processing, more particularly, to a method for laser cutting a prism. BACKGROUND

[0002] The prism is an optical instrument made of transparent material (usually glass), and the traditional prism cutting technology adopts wire cutting, that is, a metal wire is moved up and down with a grinding liquid to cut a little bit until the prism is cut off. The wire cutting has low efficiency and low precision, and the cut prism end surface is rough, which needs secondary processing, resulting in long production time and high production cost.

[0003] With the continuous development of laser technology, laser cutting technology is also used to cut the prism. The laser moves from left to right to make the laser act on the prism. However, the prism in the optical dense medium is placed in the optical sparse medium (usually in the air), the laser incident to the side surface of the prism is reflected to the other side surface of the prism. The reflected laser cuts the uncut position first, and the cut position becomes opaque. When the laser cuts the subsequent position, the laser beam cannot pass normally, so the cutting effect is not good, resulting in rough prism cutting end surface, and further secondary processing is needed, resulting in long production time and high production cost. SUMMARY

[0004] The technical problem to be solved by the embodiments of the present application is to provide a method for laser cutting a prism in view of the above defects of the prior art, aiming at solving the problem of rough prism cutting end surface in the prior art, which needs secondary processing, resulting in long production time and high production cost.

[0005] In order to solve the above technical problems, the embodiments of the present application provide a method for laser cutting a prism, which adopts the following technical scheme:

[0006] A method for laser cutting a prism is used to divide a prism finished product on a prism body, and the method comprises the following steps:

[0007] The prism body is placed on a jig of a platform, and one side of the prism body covering all side surfaces is used as an incident surface, and the incident surface faces a first laser;

[0008] The focal length of the first laser and the processing parameters are adjusted;

[0009] A first cutting path required by the prism body is set, and the starting point of the first cutting path is the axis of the prism body;

[0010] The laser beam emitted by the first laser is controlled to move along the first cutting path to cut the prism body, so as to divide the prism finished product on the prism body.

[0011] Further, before the step of placing the prism body on a jig of the platform and taking a side of the prism body covering all sides as an incident surface, the incident surface facing the first laser, the method of laser cutting a prism further comprises:

[0012] Coating a light-transmitting layer on all sides of the prism body not facing the first laser.

[0013] Preferably, the light-transmitting layer is mineral oil.

[0014] Specifically, the step of setting a first cutting path required by the prism body, the starting point of the first cutting path being the axis of the prism body, specifically comprises:

[0015] The first cutting path takes the axis of the prism body as the starting point, extends towards one side of the prism body until reaching the edge of the one side of the prism body, then returns to the starting point, and then extends towards the other side of the prism body until reaching the edge of the other side of the prism body and serving as the end point of the first cutting path.

[0016] Further, after the step of controlling the laser beam emitted by the first laser to move along the first cutting path to cut the prism body to divide the prism body into prism products, the method of laser cutting a prism further comprises:

[0017] Adjusting the laser focal length of the second laser and processing parameters;

[0018] Setting a second cutting path required by the prism body, the starting point of the second cutting path being any point on the first cutting path;

[0019] Controlling the laser beam emitted by the second laser to move along the second cutting path to crack the prism body and the prism products, so as to separate the prism body from the prism products.

[0020] Specifically, the step of setting a second cutting path required by the prism body, the starting point of the second cutting path being any point on the first cutting path, specifically comprises:

[0021] The second cutting path is consistent with the position of the first cutting path, the second cutting path takes any point on the first cutting path as the starting point, extends towards the edge of one side of the prism body until reaching the edge of the one side of the prism body, then returns to the starting point, and then extends towards the other side of the prism body until reaching the edge of the other side of the prism body and serving as the end point of the second cutting path.

[0022] Specifically, the step of adjusting the laser focal length of the second laser and processing parameters, specifically comprises:

[0023] The second laser is a carbon dioxide laser, a focal point of the first laser beam emitted by the second laser is located above an incident surface of the prism body, a laser focal length of the second laser is constant, a laser cutting speed of the second laser is 25-70 mm / s, a laser pulse frequency of the second laser is 15-50 kHz, a laser power of the second laser is 20-40 W, and a pulse width of the second laser is 3-200 nanoseconds.

[0024] Further, before the step of placing the prism body on the jig of the platform and taking a surface of the prism body covering all the side surfaces as the incident surface and making the incident surface face the first laser, the method further comprises:

[0025] A jig for fixing the prism body is made according to the shape and size of the prism body.

[0026] Specifically, the step of adjusting the laser focal length of the first laser and the machining process parameters specifically comprises:

[0027] The first laser is an infrared laser, a focal point of the first laser beam emitted by the first laser is located on an axis of the prism body, a laser focal length of the first laser is constant, a laser cutting speed of the first laser is 50-200 mm / s, a laser pulse frequency of the first laser is 100-200 kHz, a laser power of the first laser is 30-40 W, and a pulse width of the first laser is 5-10 picoseconds.

[0028] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0029] In the embodiment of the present application, the method for cutting the prism by laser first places the prism body on the jig of the platform, and uses one side of the prism body that can cover all the sides as the incident surface, the incident surface is opposite to the first laser, the incident surface of the prism body can be obliquely arranged, but the incident surface of the prism body needs to be opposite to the first laser, so as to ensure that the laser emitted by the first laser is arranged vertically to the incident surface of the prism body, so that the first laser beam emitted by the first laser does not form an angle with the prism body, and thus no reflection is generated; then, the laser focal length of the first laser and the processing parameters are adjusted, so that the prism body is located at the position of the laser focal point of the first laser, so that the laser beam emitted by the first laser can break the prism body; then, the first cutting path required by the prism body is arranged, the starting point of the first cutting path is the axis of the prism body, when the incident surface of the prism body is opposite to the first laser and the starting point of the first cutting path is the axis of the prism body, the first laser beam emitted by the first laser divides the cross section of the prism body to be cut (i.e. the cutting end surface of the prism body when the laser beam emitted by the first laser acts on the prism body along the first cutting path) into two parts with the same size and shape; finally, the laser beam emitted by the first laser is controlled to move along the first cutting path, and the prism body is cut, the position broken by the first laser beam emitted by the first laser becomes opaque, and thus when the laser beam emitted by the first laser moves to any side of the prism body along the first cutting path, even if the laser beam incident to the side surface of the prism body is reflected to the other side surface of the prism body, it cannot pass through the opaque position, so it will not cut the part that has not been cut by the first laser, after the first laser cuts one side of the prism body, the other side of the prism body is cut, since the other side of the prism body is not cut by the reflected laser, the beam of the first laser can break the other side of the prism body, so that the cutting end surface of the prism body is flat, the laser beam emitted by the first laser continues to cut the other side of the prism body along the first cutting path, and the first laser also cuts the other side of the prism body, so that the prism product is divided from the prism body, the cutting end surface of the prism body cut by the present application is flat, and secondary processing is not required, which reduces the production time and production cost, and the present application can ensure that the edge is flat, the perpendicularity is good and the internal damage is low under the high-speed cutting of the first laser. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the scheme of the present application, the drawings required in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor.

[0031] Figure 1is a flow chart of a method for laser cutting a prism provided in an embodiment of the present application;

[0032] Figure 2 is a schematic diagram of a prism body to which the present application can be applied;

[0033] Figure 3 is a schematic diagram of another prism body to which the present application can be applied. DETAILED DESCRIPTION

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the description herein and the claims of the application and the above description of the drawings herein is not intended to be complete descriptions of all features of the application; the terminology used herein is intended to be interpreted broadly according to the principles of the application. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The description herein and the claims of the application and the above description of the drawings herein is not intended to be complete descriptions of all features of the application. The terminology used herein is intended to be interpreted broadly according to the principles of the application.

[0035] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiments. It is explicitly contemplated that embodiments described herein can be combined with each other, even though such combinations can not be explicitly shown or described herein.

[0036] In order to make the technical personnel in the art better understand the scheme of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings.

[0037] The present application provides a method for laser cutting a prism, which is used for dividing a prism product on a prism body, such as Figure 1 As shown in the figure, the method for laser cutting a prism comprises the following steps:

[0038] Step S30, placing the prism body on the jig of the platform, and taking a side of the prism body which can cover all the sides as the incident surface, and the incident surface is opposite to the first laser;

[0039] Step S40, adjusting the laser focal length of the first laser and the processing parameters;

[0040] Step S50, setting the required first cutting path of the prism body, and the starting point of the first cutting path is the axis of the prism body;

[0041] Step S60, control the laser beam emitted by the first laser to move along the first cutting path, cut the prism body to divide the prism body into finished prism products.

[0042] As shown in Figure 2 and Figure 3 In the embodiment of the present application, the method for cutting the prism first places the prism body on the jig of the platform, and takes one side of the prism body that can cover all the sides as the incident surface 10, the incident surface 10 is opposite to the first laser, the incident surface 10 of the prism body can be inclinedly arranged, but the incident surface 10 of the prism body needs to be arranged opposite to the first laser, so as to ensure that the laser emitted by the first laser is arranged vertically to the incident surface 10 of the prism body, so that the first laser beam a emitted by the first laser does not form an angle with the prism body when it enters the prism body, thereby not producing reflection; then, the laser focal length of the first laser and the processing process parameters are adjusted, so that the prism body is located at the position of the laser focal point of the first laser, so that the laser beam emitted by the first laser can break the prism body; then, the first cutting path required by the prism body is set, the starting point of the first cutting path is the axis b of the prism body, the axis b is the center line in the length direction of the prism body, when the incident surface 10 of the prism body is opposite to the first laser and the starting point of the first cutting path is the axis of the prism body, the first laser beam a emitted by the first laser divides the cross section of the prism body to be cut (i.e. the cutting end surface of the prism body when the laser beam emitted by the first laser acts on the prism body along the first cutting path) into two parts of the same size and shape; finally, control the laser beam emitted by the first laser to move along the first cutting path, cut the prism body, the position broken by the first laser beam a emitted by the first laser becomes opaque, and then when the laser beam emitted by the first laser moves to any side of the prism body along the first cutting path, even if the laser beam incident to the side surface of the prism body is reflected to the other side surface of the prism body, it cannot pass through the opaque position, so it will not cut the part that has not been cut by the first laser. After the first laser cuts one side of the prism body, the other side of the prism body is cut. Since the other side of the prism body has not been cut by the reflected laser, the beam of the first laser can break the other side of the prism body, so that the cutting end surface of the prism body is flat, the laser beam emitted by the first laser continues to cut the other side of the prism body along the first cutting path, and the first laser also cuts the other side of the prism body, thereby dividing the prism body into finished prism products. The cutting end surface of the prism body after cutting is flat, and secondary processing is not required, thereby reducing production time and production cost. Under the high-speed cutting of the first laser, the edge is flat, the perpendicularity is good, and the internal damage is low.

[0043] The method for cutting the prism provided by the present application is not limited to Figure 2 and Figure 3The illustrated three-prism, five-prism, and also four-prism, six-prism, etc. The application is suitable for a prism body which has one side that can cover all the sides. If the side of the prism body facing the first laser cannot cover all the sides, when the laser beam of the first laser hits the side of the prism body near the first laser, the side of the prism body reflects the laser beam into the air due to the angle between the side of the prism body and the laser beam of the first laser, resulting in the first laser being unable to cut the prism body. When the side of the prism body that can cover all the sides faces the first laser, the laser beam emitted by the first laser moves along the first cutting path, and the laser beam of the first laser enters the prism body through the incident surface 10 of the prism body, and then the prism body is cut to divide the prism body into a prism product.

[0044] Further, before the step of placing the prism body on the jig of the platform and taking the side of the prism body that can cover all the sides as the incident surface, the incident surface facing the first laser, the laser cutting prism method further comprises:

[0045] Step S20, coating a light-transmitting layer on all the sides of the prism body that do not face the first laser.

[0046] The light-transmitting layer increases the refractive index of the prism body. When the first laser extends to any side of the prism body along the first cutting path, the laser incident to the side of the prism body transmits through the prism body under the action of the light-transmitting layer, and thus does not form reflection, further preventing the laser from cutting the part that has not been cut by the first laser, and further making the cut prism body and the cut end surface of the prism product flat without the need for secondary processing, reducing production time and production cost.

[0047] Preferably, the light-transmitting layer is mineral oil. The formation condition of reflection is from a medium with a large refractive index to a medium with a small refractive index. The refractive index of air is 1, and the refractive index of glass (the material of the prism is usually glass) is 1.5, so reflection occurs when light goes from the glass surface to the air. Coating mineral oil can increase the refractive index of the prism body, so that light transmits through the prism body and thus does not form reflection.

[0048] Specifically, the step of setting the first cutting path required by the prism body, the starting point of the first cutting path being the axis of the prism body, specifically comprises: the first cutting path takes the axis a of the prism body as the starting point, extends to one side of the prism body, and then returns to the starting point, and then extends to the other side of the prism body and reaches the edge of the other side of the prism body as the end point of the first cutting path.

[0049] Firstly, the first laser beam a of the first laser is incident from the axis of the prism body, which divides the cross section of the prism body to be cut (i.e. the cutting end surface of the prism body when the laser beam emitted by the first laser acts on the prism body along the first cutting path) into two parts of the same size and shape, and the position broken by the first laser beam a emitted by the first laser becomes opaque; then the first laser moves towards one side of the prism body, so that even if the laser incident to the side surface of the prism body is reflected to the other side surface of the prism body, it cannot pass through the opaque position, and thus cannot cut the part not cut by the first laser. The first laser continuously emits laser beams to break the one side of the prism body until the edge of the one side of the prism body is reached, and the first laser completes the cutting of the one side of the prism body. At this time, the first laser no longer emits light; then the first laser emits light again when returning to the starting point; then the first laser continues to move towards the other side of the prism body. Since the other side of the prism body has not been cut by the reflected laser, the beam of the first laser can break the other side of the prism body to make the cutting end surface of the prism body flat. The first laser continuously emits laser beams to break the other side of the prism body until the edge of the other side of the prism body is reached, and the first laser completes the cutting of the prism body to divide the prism body into prism products.

[0050] Further, after the step of controlling the laser beam emitted by the first laser to move along the first cutting path to cut the prism body to divide the prism body into prism products, the method further comprises:

[0051] Step S70, adjusting the laser focal length of the second laser and the processing parameters;

[0052] Step S80, setting the second cutting path required by the prism body, and the starting point of the second cutting path is any point on the first cutting path;

[0053] Step S90, controlling the laser beam emitted by the second laser to move along the second cutting path to crack the prism body and the prism product, so as to separate the prism body from the prism product.

[0054] In the embodiment of the present application, after the prism main body is divided into the finished prism, the laser focal length of the second laser and the processing parameters are adjusted, so that the laser focal point of the second laser is located above the incident surface 10 of the prism main body, and the laser beam emitted by the second laser can separate the prism main body from the finished prism; then, the second cutting path required by the prism main body is set, the starting point of the second cutting path is any point on the first cutting path, and the first laser has divided the prism main body into the finished prism, so the axis of the prism main body does not need to be the starting point of the second cutting path; finally, the laser beam of the second laser is controlled to move along the second cutting path, the temperature at the laser focal point of the laser beam emitted by the second laser is high, the energy carried by the laser plays a role of continuous auxiliary heating, the heat is conducted into the trace left by the first cutting path, the prism main body and the finished prism fall off along the first cutting path due to the thermal expansion and contraction effect, the cracking effect is achieved, and the purpose of cracking the prism main body and the finished prism is achieved, so that the prism main body and the finished prism are separated.

[0055] Specifically, the step of setting the second cutting path required by the prism main body, and the starting point of the second cutting path being any point on the first cutting path specifically includes:

[0056] The second cutting path is consistent with the position of the first cutting path, the second cutting path takes any point on the first cutting path as the starting point, extends towards the edge of one side of the prism main body, and reaches the edge of one side of the prism main body, then returns to the starting point, and then extends towards the other side of the prism main body, and reaches the edge of the other side of the prism main body as the end point of the second cutting path.

[0057] First, the first laser beam of the second laser is emitted above the incident surface 10 of the prism main body from any point on the first cutting path; then, the laser beam of the second laser is controlled to move towards the edge of one side of the prism main body, the second laser continuously emits the laser beam, and the laser beam reaches the edge of one side of the prism main body; at this time, the second laser no longer emits light; then, when returning to the starting point, the second laser emits light again; then, the second laser moves towards the other side of the prism main body, the second laser continuously emits the laser beam, and the laser beam reaches the edge of the other side of the prism main body; the temperature at the laser focal point of the laser beam emitted by the second laser is high, the energy carried by the laser plays a role of continuous auxiliary heating, the heat is conducted into the trace left by the first cutting path, the prism main body and the finished prism fall off along the first cutting path due to the thermal expansion and contraction effect, the cracking effect is achieved, and the purpose of cracking the prism main body and the finished prism is achieved, so that the prism main body and the finished prism are separated.

[0058] Preferably, the starting point of the second cutting path is the edge of one side of the prism main body, and the distance from the edge of one side of the prism main body to the edge of the other side of the prism main body is reduced, so that the moving distance of the second laser is reduced.

[0059] Of course, in other embodiments, the starting point of the second cutting path is any point on the first cutting path, as long as the length of the crack line formed by the second cutting path is equal to the length of the cutting line formed by the first cutting path.

[0060] Specifically, the step of adjusting the laser focal length of the second laser and the processing parameters specifically includes: the second laser is a carbon dioxide laser, the focal point of the first laser beam emitted by the second laser is located above the incident surface 10 of the prism body, the laser focal length of the second laser is unchanged, the laser cutting speed of the second laser is 25-70 mm / s, the laser pulse frequency is 15-50 kHz, the laser power is 20-40 W, and the pulse width is 3-200 nanoseconds. The temperature at the laser focal point of the laser beam emitted by the second laser is high, and the energy carried by the laser plays a role in continuous auxiliary heating. The heat is conducted to the traces left by the first cutting path, causing the prism body and the prism product to fall off along the first cutting path due to thermal expansion and contraction effects, achieving the effect of splitting, thereby completing the purpose of splitting the prism body and the prism product, and separating the prism body from the prism product.

[0061] Further, before the step of placing the prism body on the jig of the platform, and taking a surface of the prism body that can cover all the side surfaces as the incident surface, the laser cutting prism method further comprises:

[0062] Step S10, according to the shape and size of the prism body, a jig for fixing the prism body is made. The prism body is fixed so as to avoid the prism body from tilting when the first laser cuts the prism body, which causes the incident surface 10 of the prism body to not face the first laser, the laser beam emitted by the first laser enters the prism body at an angle with the prism body, and further causes the cutting end surface of the cut prism body and the prism product to be rough.

[0063] Specifically, the step of adjusting the laser focal length of the first laser and the processing parameters specifically includes: the first laser is an infrared laser, the focal point of the first laser beam emitted by the first laser is located on the axis b of the prism body, the laser focal length of the first laser is unchanged, the laser cutting speed of the first laser is 50-200 mm / s, the laser pulse frequency is 100-200 kHz, the laser power is 30-40 W, and the pulse width is 5-10 picoseconds. The first laser is a picosecond-level ultrafast infrared laser, and the narrow pulse width of the first laser shows great advantages. By taking advantage of the low heat energy diffusion characteristics, the prism body is broken before the heat is conducted to the surrounding materials.

[0064] Obviously, the above-described embodiments are only some embodiments but not all the embodiments of the present application, the preferred embodiments of the present application are shown in the drawings, but do not limit the patent scope of the present application. The present application can be implemented in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent replacements to some technical features therein. Any equivalent structure made by using the content of the specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A method for laser-cutting a prism, used to divide a prism body into finished prism pieces, characterized in that, The method includes the following steps: The prism body is placed on the fixture of the platform, and the side of the prism body that can cover all sides is taken as the incident surface. The incident surface faces the first laser, and the laser emitted by the first laser is set perpendicular to the incident surface of the prism body. Adjust the laser focal length and processing parameters of the first laser to position the prism body at the laser focal point of the first laser, so that the laser beam emitted by the first laser breaks the prism body. The first cutting path required for the prism body is set, and the starting point of the first cutting path is the axis of the prism body. Specifically, the first cutting path starts from the axis of the prism body, and the first laser beam of the first laser is injected from the axis of the prism body, dividing the cross-section of the prism body to be cut into two parts of the same size and shape. The position interrupted by the first laser beam emitted by the first laser becomes opaque. The path extends towards one side of the prism body until it reaches the edge of one side of the prism body, then returns to the starting point, and then extends towards the other side of the prism body until it reaches the edge of the other side of the prism body and serves as the end point of the first cutting path. The laser beam emitted by the first laser is controlled to move along the first cutting path to cut the prism body, so as to divide the prism body into finished prisms.

2. The method for laser-cutting a prism according to claim 1, characterized in that, Before the step of placing the prism body on the platform fixture, and using the side of the prism body that covers all sides as the incident surface, with the incident surface facing the first laser, the laser cutting prism method further includes: A light-transmitting layer is coated on all sides of the prism body that are not directly facing the first laser.

3. The method for laser-cutting a prism according to claim 2, characterized in that, The light-transmitting layer is mineral oil.

4. The method for laser-cutting a prism according to claim 1, characterized in that, After the step of controlling the laser beam emitted by the first laser to move along the first cutting path to cut the prism body, so as to divide the prism body into finished prisms, the laser cutting prism method further includes: Adjust the laser focal length of the second laser and the processing parameters; Set the second cutting path required for the prism body, with the starting point of the second cutting path being any point on the first cutting path; The laser beam emitted by the second laser is controlled to move along the second cutting path to split the prism body and the finished prism, thereby separating the prism body from the finished prism.

5. The method for laser-cutting a prism according to claim 4, characterized in that, The step of setting the second cutting path required for the prism body, wherein the starting point of the second cutting path is any point on the first cutting path, specifically includes: The second cutting path is in the same position as the first cutting path. The second cutting path starts from any point on the first cutting path and extends towards the edge of one side of the prism body until it reaches the edge of one side of the prism body. Then it returns to the starting point and extends towards the other side of the prism body until it reaches the edge of the other side of the prism body, which is the end point of the second cutting path.

6. The method for laser-cutting a prism according to claim 4, characterized in that, The steps of adjusting the laser focal length of the second laser and the processing parameters specifically include: The second laser is a carbon dioxide laser. The focal point of the first laser beam emitted by the second laser is located above the incident surface of the prism body. The laser focal length of the second laser remains unchanged. The laser cutting speed of the second laser is 25-70 mm / s, the laser pulse frequency is 15-50 kHz, the laser power is 20-40 W, and the pulse width is 3-200 nanoseconds.

7. The method for laser-cutting a prism according to claim 1, characterized in that, Before the step of placing the prism body on the platform fixture, and using the side of the prism body that covers all sides as the incident surface, with the incident surface facing the first laser, the laser cutting prism method further includes: A jig for fixing the prism body is made according to the shape and size of the prism body.

8. The method for laser-cutting a prism according to claim 1, characterized in that, The steps of adjusting the laser focal length of the first laser and the processing parameters specifically include: The first laser is an infrared laser. The focal point of the first laser beam emitted by the first laser is located on the axis of the prism body. The focal length of the first laser remains unchanged. The laser cutting speed of the first laser is 50-200 mm / s, the laser pulse frequency is 100-200 kHz, the laser power is 30-40 W, and the pulse width is 5-10 picoseconds.

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