Green laser, laser marking machine and laser cutting machine

Abstract

The utility model discloses a green laser, a laser marking machine and a laser cutting machine. The green laser is provided with a first light path formed by a first lens and a second lens, and a second light path formed by the second lens and a fourth lens. The green laser further comprises a third lens, a green frequency doubling assembly, an acousto-optic Q switch and at least one laser crystal, and the third lens is arranged in the second light path, so that the second light path is divided into a first path and a second path; the second lens reflects light in two directions of the first light path and the second light path respectively; the first lens can reflect light of a first light path; the fourth lens can reflect the light of the second path, and the third lens can reflect the light of the first path and the second path; the second lens is used for transmitting first pump light emitted along a first light path and / or along a first path; the third lens is also configured to transmit second pump light emitted along the first path and / or along a second path. The technical scheme of the utility model aims to improve the power of the green laser.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, in particular to a green laser, a laser marking machine and a laser cutting machine. Background Art

[0002] In the laser marking industry, infrared lasers or green lasers (typically with a wavelength of 532 nm) are commonly used for marking. However, existing technologies using red lasers for marking have a high reflectivity on some metals and non-metallic materials, making it difficult for the material to absorb its energy, reducing marking efficiency. While green lasers are more effectively absorbed by some metals and non-metallic materials, existing green lasers have low power and cannot meet the power requirements of laser marking. Utility Model Content

[0003] The purpose of the utility model is to provide a green laser, a laser marking machine and a laser cutting machine, aiming to solve the problem of low power of the existing green laser.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A green laser, comprising: a first optical path formed by a first lens and a second lens arranged at an interval; and a second optical path formed by a second lens and a fourth lens arranged at an interval; the second lens reflects light in two directions of the first optical path and the second optical path respectively; and the first lens is capable of reflecting light in the first optical path;

[0006] The green laser further includes a third lens, which is disposed between the second optical path, so that the second optical path is divided into a first path formed by the second lens and the third lens being spaced apart, and a second path formed by the third lens and the fourth lens being spaced apart. The third lens is capable of reflecting light from the first path and the second path; and the fourth lens is capable of reflecting light from the second path.

[0007] The second lens is used to transmit the first pump light emitted along the first optical path and / or along the first path; the third lens is also used to transmit the second pump light emitted along the first path and / or along the second path;

[0008] The green laser further includes a green light frequency doubling component, an acousto-optic Q-switch, and at least one laser crystal; at least one laser crystal is arranged in the optical path of the first pump light and the second pump light; the acousto-optic Q-switch is arranged in the first optical path or the second optical path; the green light frequency doubling component is arranged in the second path and is capable of converting the light in the second path into green laser light.

[0009] In one embodiment, the green light frequency doubling component includes a fifth lens and a frequency doubling crystal;

[0010] The fifth lens is tilted on the second path and can transmit the light reflected by the third lens and reflect the light reflected by the fourth lens; the frequency doubling crystal is arranged on the optical path formed by the fifth lens and the fourth lens being spaced apart.

[0011] In one embodiment, the first pump light passes through the second lens to enter the first optical path; the second pump light passes through the third lens to enter the second path; at least one laser crystal is arranged in the first optical path, and at least one laser crystal is arranged in the second path.

[0012] In one embodiment, the first pump light transmits through the second lens to enter the first path; the second pump light transmits through the third lens to enter the first path; and at least one laser crystal is disposed in the first path.

[0013] In one embodiment, the first pump light transmits the second lens along the first optical path and the first path respectively; the second pump light transmits the third lens along the first path and the second path respectively;

[0014] At least one of the laser crystals is arranged on the first optical path, at least one of the laser crystals is arranged on the second optical path; and at least one of the laser crystals is arranged on the first path.

[0015] In one embodiment, the first lens is a 0° convex reflector for reflecting light; the acousto-optic Q-switch is arranged in the first optical path and is close to the first lens.

[0016] In one embodiment, the first optical path is parallel to the second optical path.

[0017] In one embodiment, the green laser further includes a sixth lens; the sixth lens is used to reflect the light reflected by the fifth lens; the light path reflected by the sixth lens is a third light path, and the first light path, the second light path and the third light path are parallel to each other.

[0018] The present invention also provides a laser marking machine, comprising any one of the green lasers described above.

[0019] The present invention also provides a laser cutting machine, comprising any one of the green lasers described above.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a green laser, laser marking machine, and laser cutting machine. The green laser is configured with a first optical path and a second optical path, with a second lens disposed between the first and second optical paths; a third lens disposed on the second optical path, so that the second optical path is composed of the first and second paths; the green laser is further configured with at least one laser crystal; the second lens is capable of transmitting a first pump light emitted along the first optical path and / or along the first path; the third lens is capable of transmitting a second pump light emitted along the first path and / or along the second path; the first pump light and the second pump light are respectively transmitted through the first lens and the second lens and then absorbed by the laser crystal, thereby generating fundamental frequency light. Therefore, the present invention simultaneously absorbs the first and second pump lights through the laser crystal, amplifying the optical energy and light gain within the first and second optical paths, thereby increasing the average power of the fundamental frequency light in the optical path. The acousto-optic Q switch in the present invention is disposed in the first or second optical path and is used to modulate the fundamental frequency light and the frequency-doubled light into pulsed laser light, thereby increasing the peak power in the optical path. Furthermore, a green light frequency-doubling component is provided in the second path, capable of converting the light in the second path into green laser light. Therefore, the present invention's technical solution simultaneously receives the first and second pump lights in the laser crystal, amplifying the light energy in the first and second optical paths, increasing the average power of the fundamental frequency light in the optical paths, and thus the average power of the green laser light. Furthermore, the provision of an acousto-optic Q-switch increases the peak power of the green laser light, effectively resolving the existing problem of low green laser power. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification so as to facilitate understanding and reading by those familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed in the present invention.

[0024] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0025] Figure 2 This is a schematic structural diagram of an embodiment of the present utility model;

[0026] Figure 3 This is a schematic structural diagram of an embodiment of the present utility model;

[0027] Illustration: 10, green laser; 11, first lens; 12, second lens; 13, third lens; 14, fourth lens; 15, fifth lens; 16, sixth lens;

[0028] 17. Frequency doubling crystal; 18. Acousto-optic Q switch; 19. Laser crystal;

[0029] P1, first optical path; P2a, first path; P2b, second path; P3, third optical path;

[0030] L1, first pump light; L2, second pump light. DETAILED DESCRIPTION

[0031] In order to make the technical objectives, features, and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally located component.

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] The embodiments of the utility model provide a green laser, a laser marking machine and a laser cutting machine.

[0035] See also Figure 1 、 Figure 2 and Figure 3A green laser, characterized in that the green laser 10 has: a first optical path P1 formed by a first lens 11 and a second lens 12 arranged at intervals, and a second optical path formed by the second lens 12 and a fourth lens 14 arranged at intervals; the second lens 12 reflects light in two directions of the first optical path P1 and the second optical path respectively; the first lens 11 can reflect light in the first optical path P1; the fourth lens 14 can reflect light in the second path P2b;

[0036] The green laser 10 further includes a third lens 13, which is disposed between the second optical paths to separate the second optical paths into a first path P2a formed by the second lens 12 and the third lens 13 being spaced apart, and a second path P2b formed by the third lens 13 and the fourth lens 14 being spaced apart. The third lens 13 is capable of reflecting light from both the first path P2a and the second path P2b.

[0037] The second lens 12 is used to transmit the first pump light L1 emitted along the first optical path P1 and / or along the first path P2a; the third lens 13 is also used to transmit the second pump light L2 emitted along the first path P2a and / or along the second path P2b;

[0038] The green laser 10 further includes a green light frequency doubling component, an acousto-optic Q-switch 18, and at least one laser crystal 19; at least one laser crystal 19 is disposed in the optical path of the first pump light L1 and the second pump light L2; the acousto-optic Q-switch 18 is disposed in the first optical path P1 or the second optical path; the green light frequency doubling component is disposed in the second path P2b and is capable of converting the light in the second path P2b into green laser light.

[0039] The green laser 10, laser marking machine and laser cutting machine of the present invention are configured by configuring a first optical path P1 and a second optical path, and configuring a second lens 12 between the first optical path P1 and the second optical path; configuring a third lens 13 on the second optical path so that the second optical path consists of the first path P2a and the second path P2b; the green laser 10 is also configured with at least one laser crystal 19; the second lens 12 can transmit the first pump light L1 emitted along the first optical path P1 and / or along the first path P2a; the third lens 13 can transmit the second pump light L2 emitted along the first path P2a and / or along the second path P2b; the first pump light L1 and the second pump light L2 are absorbed by the laser crystal 19 after respectively transmitting the first lens 11 and the second lens 12, thereby generating fundamental frequency light, and the fundamental frequency light can oscillate within the first optical path P1 and the second optical path. Therefore, the present technical solution utilizes the laser crystal 19 to simultaneously absorb the first pump light L1 and the second pump light L2, thereby amplifying the optical energy within the first optical path P1 and the second optical path and achieving light gain, thereby increasing the average power of the fundamental frequency light within the optical path. The acousto-optic Q-switch 18 in the present technical solution is disposed in the first optical path P1 or the second optical path, and is used to modulate the fundamental frequency light and the frequency-doubled light into a pulsed laser, thereby increasing the peak power within the optical path. Furthermore, a green light frequency-doubled component is disposed in the second path P2b, capable of converting the fundamental frequency light into green laser light. Therefore, the present technical solution utilizes the laser crystal 19 to simultaneously receive the first pump light L1 and the second pump light L2, thereby amplifying the optical energy within the first optical path P1 and the second optical path, thereby increasing the average power of the fundamental frequency light within the optical path and, in turn, the average power of the green laser light. Furthermore, the provision of the acousto-optic Q-switch 18 increases the peak power of the green laser light, thereby effectively resolving the existing problem of low green laser power.

[0040] It should also be noted that the at least one laser crystal 19 is arranged in the optical path of the first pump light L1 and the second pump light L2, which specifically means that the light of the first pump light L1 transmitted through the second lens 12 can be received by the at least one laser crystal 19 and converted into fundamental frequency light, and the light of the second pump light L2 transmitted through the third lens 13 can be received by the at least one laser crystal 19 and converted into fundamental frequency light.

[0041] It should also be noted that the second pump light L2 is not reflected in the optical path before being received by the laser crystal 19 .

[0042] It should also be noted that, in a specific embodiment of the above solution, the wavelengths of the first pump light L1 and the second pump light L2 may be 808 nm, 880 nm or 888 nm.

[0043] Alternatively, the laser crystal 19 may be an Nd:YVO4 laser crystal 19 (yttrium vanadate doped with neodymium crystal), an Nd:YAG laser crystal 19 (yttrium aluminum garnet doped with neodymium crystal), an Nd:YLF laser crystal 19 (lithium yttrium fluoride doped with neodymium crystal), or an Nd:GdVO4 laser crystal 19 (gadolinium vanadate doped with neodymium crystal). The laser crystal 19 is used to generate laser light with a wavelength of 1064 nm.

[0044] Optionally, the first lens 11 is a high-reflection 1064nm 0° convex mirror.

[0045] Optionally, the second lens 12 is a high-transmittance 880nm, high-reflection 1064nm 45° plane reflector.

[0046] Optionally, the third lens 13 is a high-transmittance 880nm, high-reflection 1064nm 45° plane reflector.

[0047] Optionally, the fourth lens 14 is a high-reflection 1064nm and high-reflection 532nm plane mirror.

[0048] It will be understood that the acousto-optic Q-switch 18 is an optical device used to modulate laser output. Its operating principle is based on the acousto-optic effect, which modulates the light beam by changing the refractive index of a medium induced by acoustic waves. Specifically, the acousto-optic Q-switch 18 comprises an acousto-optic medium (typically a crystal such as quartz or lithium niobate) and a transducer for generating ultrasonic waves. When the transducer generates ultrasonic waves, these waves propagate through the medium and induce periodic refractive index changes, forming a grating. This grating can diffract the laser beam passing through the medium, thereby changing its path and intensity. In this embodiment, the acousto-optic Q-switch 18 is primarily used to convert the fundamental frequency light in the first optical path P1 and the second optical path P2 into pulsed laser light.

[0049] Further, see Figure 1 、 Figure 2 or Figure 3 The green light frequency-doubling component is disposed on the second path P2b and is capable of converting the light from the second path P2b into green laser light. The green light frequency-doubling component includes a fifth lens 15 and a frequency-doubling crystal 17. The fifth lens 15 is disposed obliquely on the second path P2b and is capable of transmitting light reflected by the third lens 13 and reflecting light reflected by the fourth lens 14. The frequency-doubling crystal 17 is disposed on the optical path formed by the spaced-apart arrangement of the fifth lens 15 and the fourth lens 14.

[0050] It can be understood that the fifth lens 15 is capable of transmitting the fundamental frequency light converted by the laser crystal 19 and reflecting the green laser light converted by the frequency doubling crystal 17 .

[0051] Optionally, the fifth lens 15 is a high-reflection 532nm and high-transmittance 1064nm reflector.

[0052] Optionally, the frequency-doubling crystal 17 is an LBO (lithium triborate) crystal, which can be used to convert fundamental frequency light of 1064 nm wavelength into frequency-doubling light of 532 nm wavelength.

[0053] See also Figure 1 In one embodiment of this technical solution, the first pump light L1 transmits through the second lens 12 and enters the first optical path P1; the second pump light L2 transmits through the third lens 13 and enters the second path P2b; at least one laser crystal 19 is disposed on the first optical path P1, and at least one laser crystal 19 is disposed on the second path P2b. It is understood that disposing at least one laser crystal 19 on the first optical path P1 and at least one laser crystal 19 on the second path P2b can reduce the width of the green laser 10 and improve the spatial utilization of the green laser 10. Furthermore, disposing the laser crystals 19 on both the first optical path P1 and the second path P2b can reduce the thermal lensing effect in the solid-state laser, thereby further improving the light conversion efficiency and power.

[0054] See also Figure 2 In another embodiment of this technical solution, the first pump light L1 passes through the second lens 12 and enters the first path P2a; the second pump light L2 passes through the third lens 13 and enters the first path P2a; and at least one laser crystal 19 is disposed on the first path P2a. It will be appreciated that the placement of at least one laser crystal 19 on the first path P2a can reduce the length of the green laser 10, thereby better adapting it to other devices.

[0055] It should also be noted that the provision of at least two laser crystals 19 along the first path P2a can reduce the thermal lensing effect in the solid-state laser. Furthermore, the provision of at least two laser crystals 19 facilitates adjustment of the distance parameters of the accessories in the green laser, thereby further improving the beam quality of the green laser.

[0056] See also Figure 3 In another embodiment of the present technical solution, the first pump light L1a and L1b respectively transmit the second lens 12 along the first optical path P1 and the first path P2a; the second pump light L2a and L2b respectively transmit the third lens 13 along the first path P2a and the second path P2b;

[0057] At least one laser crystal 19 is disposed on the first optical path P1 , at least one laser crystal 19 is disposed on the second optical path P2 b , and at least one laser crystal 19 is disposed on the first optical path P2 a .

[0058] It can be understood that the first pump light L1a, L1b transmits the second lens 12 along the first optical path P1 and the first path P2a respectively, and the second pump light L2a, L2b transmits the third lens 13 along the first path P2a and the second path P2b respectively, which can amplify the fundamental frequency light and increase the average power of the fundamental frequency light.

[0059] Optionally, the first lens 11 is a 0° convex reflector for reflecting light. It is understood that the 0° convex reflector is mainly used for beam shaping to improve beam quality.

[0060] Optionally, the acousto-optic Q-switch 18 is disposed in the first optical path P1 and is positioned close to the first lens 11. It is understood that since the 0° convex reflector can achieve beam shaping, the placement of the acousto-optic Q-switch 18 close to the first lens 11 can improve the diffraction efficiency of the acousto-optic Q-switch 18, thereby reducing light loss caused by the acousto-optic Q-switch 18.

[0061] See also Figure 1 、 Figure 2 and Figure 3 In a specific embodiment, the first optical path P1 is parallel to the second optical path P2b.

[0062] Furthermore, the green laser 10 further includes a sixth lens 16; the green laser 10 further includes a sixth lens 16; the sixth lens 16 is used to reflect the light reflected by the fifth lens 15. It can be understood that the sixth lens 16 is mainly used to optimize the optical path.

[0063] Optionally, the sixth lens 16 is a high-reflection 532nm mirror.

[0064] Furthermore, the light path reflected by the sixth lens 16 is a third light path P3 , and the first light path P1 , the second light path P2 b and the third light path P3 are parallel to each other.

[0065] It can be understood that the first optical path P1 is parallel to the second path P2b or the first optical path P1, the second path P2b and the third optical path P3 are parallel to each other in order to simplify the light beam path and reduce the loss of the light beam in the propagation path.

[0066] Optionally, in order to simplify the light beam path and reduce light beam loss in the propagation path, the second lens 12 is tilted 45° relative to the first light path P1, and the third lens 13 is tilted 45° relative to the second path P2b.

[0067] This utility model also provides a laser marking machine, comprising any of the green lasers 10 described above. Because the green laser 10 generates high-power green laser light, it improves the marking efficiency of the laser marking machine. The laser marking machine incorporates all the technical features of the green laser 10, and therefore the remaining beneficial effects of the laser marking machine are not reiterated here.

[0068] The present invention also provides a laser cutting machine comprising any of the green lasers 10 described above. Because the green laser 10 can emit high-power green laser light, the cutting efficiency of the laser cutting machine is improved. The laser cutting machine includes all the technical features of the green laser 10, and therefore the remaining beneficial effects of the laser cutting machine are not reiterated here.

[0069] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A green laser, characterized in that: The green laser has: a first optical path formed by a first lens and a second lens arranged at intervals, and a second optical path formed by a second lens and a fourth lens arranged at intervals; the second lens reflects light in two directions of the first optical path and the second optical path respectively; the first lens is capable of reflecting light in the first optical path; The green laser further includes a third lens, which is disposed between the second optical path, so that the second optical path is divided into a first path formed by the second lens and the third lens being spaced apart, and a second path formed by the third lens and the fourth lens being spaced apart. The third lens is capable of reflecting light from the first path and the second path; and the fourth lens is capable of reflecting light from the second path. The second lens is used to transmit the first pump light emitted along the first optical path and / or along the first path; the third lens is also used to transmit the second pump light emitted along the first path and / or along the second path; The green laser further includes a green light frequency doubling component, an acousto-optic Q-switch, and at least one laser crystal; at least one laser crystal is arranged in the optical path of the first pump light and the second pump light; the acousto-optic Q-switch is arranged in the first optical path or the second optical path; the green light frequency doubling component is arranged in the second path and is capable of converting light in the first optical path and the second optical path into green laser light.

2. The green laser according to claim 1, characterized in that The green light frequency doubling component includes a fifth lens and a frequency doubling crystal; The fifth lens is tilted on the second path and can transmit the light reflected by the third lens and reflect the light reflected by the fourth lens; the frequency doubling crystal is arranged on the optical path formed by the fifth lens and the fourth lens being spaced apart.

3. The green laser according to claim 2, characterized in that: The first pump light passes through the second lens and enters the first optical path; the second pump light passes through the third lens and enters the second path; at least one laser crystal is arranged in the first optical path, and at least one laser crystal is arranged in the second path.

4. The green laser according to claim 2, characterized in that The first pump light transmits the second lens and enters the first path; the second pump light transmits the third lens and enters the first path; at least one laser crystal is arranged in the first path.

5. The green laser according to claim 2, characterized in that: The first pump light transmits the second lens along the first optical path and the first path respectively; the second pump light transmits the third lens along the first path and the second path respectively; At least one of the laser crystals is arranged on the first optical path, at least one of the laser crystals is arranged on the second optical path; and at least one of the laser crystals is arranged on the first path.

6. The green laser according to claim 1, characterized in that The first lens is a 0° convex reflector for reflecting light; the acousto-optic Q switch is arranged in the first optical path and close to the first lens.

7. The green laser according to any one of claims 2 to 6, characterized in that: The first optical path is parallel to the second optical path.

8. The green laser according to claim 2, characterized in that: The green laser further includes a sixth lens; the sixth lens is used to reflect the light reflected by the fifth lens; the light path reflected by the sixth lens is a third light path, and the first light path, the second path and the third light path are parallel to each other.

9. A laser marking machine, characterized in that: The invention comprises the green laser according to any one of claims 1 to 8.

10. A laser cutting machine, characterized in that: The invention comprises the green laser according to any one of claims 1 to 8.

Images