Q-switched resonant cavity structure

Abstract

The utility model relates to the technical field of lasers, in particular to a Q-switched resonant cavity structure, which comprises a tail mirror, a discharge tube I, a turning mirror I, a discharge tube II, a focus lens I, an output mirror, a turning mirror II, a focus lens II and a chopping component, the tail mirror and the turning mirror I are respectively arranged at two ends of the discharge tube I, and the output mirror and the turning mirror II are respectively arranged at two ends of the discharge tube II. The first turning mirror and the second turning mirror are oppositely arranged, a first focusing mirror and a second focusing mirror are arranged between the first turning mirror and the second turning mirror, the first focusing mirror and the second focusing mirror can focus light beams, and the second turning mirror is used for turning light at the second focusing mirror into the second discharge tube; the output shaft of the rotary driving part is connected with the chopping disc, and the chopping disc is located at the focusing position of the focusing mirror I. The laser device has the advantages that the structure is simplified, one window mirror is omitted, the laser energy loss is reduced, the light path adjustment is simple, and the stable laser output characteristic can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lasers, and specifically relates to a Q-switching resonator structure. Background Technique

[0002] The CO2 laser is a kind of laser with a relatively high continuous output power at present. Laser cutting is to use a laser beam with a high power density to scan the surface of the material, heat the material to several thousand to tens of thousands of degrees Celsius in an extremely short time, melt or vaporize the material, and then blow away the melted or vaporized substance from the cut with high-pressure gas to achieve the purpose of cutting the material.

[0003] The emergence and development of the Q-switching technology of lasers is an important breakthrough in the history of laser development. As early as 1962, the first Q-switching laser was successfully developed. The Q-switching technology can increase the peak power of the laser by several orders of magnitude and compress the laser energy into an extremely narrow pulse for emission. At present, laser pulses with a peak power above megawatt level and a pulse width of nanosecond level are not difficult to obtain. The emergence of the Q-switching technology has greatly promoted the application of laser technology in two aspects. On the one hand, the interaction between the Q-switching laser pulse and the material has directly promoted the development of nonlinear optics; on the other hand, the very short pulse width of the Q-switching laser pulse has promoted the development of related application technologies, such as pulsed laser ranging, lidar, high-speed holography, etc.

[0004] The existing invention patent CN201811599142.9 discloses a laser resonator system with a laser resonant structure. In the existing Q-switching laser resonator, the Q-switch is often set at the output mirror, the structure is relatively complex, one window mirror is often used, and some laser energy is lost, which is not conducive to assembly and protection. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] In view of the deficiencies of the prior art, the utility model provides a Q-switching resonator structure, which has the characteristics of simplifying the structure, reducing one window mirror, reducing the loss of laser energy, simple optical path adjustment, and being conducive to improving the stable laser output characteristics.

[0007] (2) Technical Solutions

[0008] To achieve the above object, the present utility model provides the following technical solutions: A Q-switching resonator structure includes a tail mirror, a first discharge tube, a first turning mirror, a second discharge tube, a first focusing mirror, an output mirror, a second turning mirror, a second focusing mirror, and a chopping assembly. The tail mirror and the first turning mirror are respectively arranged at both ends of the first discharge tube, and the output mirror and the second turning mirror are respectively arranged at both ends of the second discharge tube. The first turning mirror and the second turning mirror are arranged opposite to each other, and the first focusing mirror and the second focusing mirror are arranged between the first turning mirror and the second turning mirror. The first focusing mirror and the second focusing mirror can focus the light beam. The first turning mirror is used to turn the light transmitted in the first discharge tube to the first focusing mirror, and the second turning mirror is used to turn the light at the second focusing mirror to the inside of the second discharge tube;

[0009] The chopping assembly includes a chopping disk and a rotation driving part. The output shaft of the rotation driving part is connected to the chopping disk, and the chopping disk is located at the focusing position of the first focusing mirror and the second focusing mirror.

[0010] Preferably, the chopping disk is arranged at an angle with the optical axis of the light beam supported by the first focusing mirror.

[0011] Preferably, the first focusing mirror and the second focusing mirror can focus the light beam at a point, and the chopping position of the chopping disk is located at the light beam focusing position of the first focusing mirror and the second focusing mirror.

[0012] Preferably, the rotation driving part is an ultra-high speed spindle motor.

[0013] Preferably, it further includes a support assembly. The support assembly includes a first end plate, a second end plate, a protective box, a light bridge fixing tube, and a fixing plate. The first end plate and the second end plate are connected by a plurality of light bridge fixing tubes. A plurality of protective boxes are connected to the second end plate. The first turning mirror and the first focusing mirror are connected to the same protective box, and the second turning mirror and the second focusing mirror are connected to the same protective box. A fixing plate is connected between the plurality of light bridge fixing tubes. The tail mirror and the output mirror are installed on the first end plate.

[0014] Preferably, the support assembly further includes a limiting plate and an extension plate. The limiting plate is connected to the fixing plate. The plurality of light bridge fixing tubes are located between the limiting plate and the fixing plate. Positioning grooves corresponding to the light bridge fixing tubes are provided on the limiting plate and the fixing plate. A plurality of extension plates are connected to the fixing plate. The first discharge tube and the second discharge tube are connected to the corresponding extension plates.

[0015] Preferably, the rotation driving part can perform frequency conversion control.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present utility model provides a Q-switching resonator structure, which has the following beneficial effects:

[0018] The Q-switching resonator structure performs chopping at the turning point through a chopping disk, which can be adapted to reduce the change of light at the direct output end. The original integrated corner mirror is disassembled, and the turning mirror 1, focusing mirror 1, turning mirror 2, and focusing mirror 2 form an optical turning structure to perform chopping operation on the light at the turning point, which is adapted to adjust the light at the discharge tube 2 to make the output light more stable. The chopping position is installed at the turning point, which is adapted to perform chopping inside the optical transmission path, improve the connection effect between the chopping position and the turning point, and is adapted to install both the chopping position and the turning point in a relatively enclosed environment, which is beneficial for protection. The structure is simplified, one window mirror is reduced, the laser energy loss is reduced, the optical path adjustment is simple, and it is beneficial to improve the stable laser output characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is a three-dimensional structural diagram of the present invention.

[0021] Reference numerals in the drawings: 1, end plate 1; 2, tail mirror; 3, discharge tube 1; 4, end plate 2; 5, turning mirror 1; 6, discharge tube 2; 7, focusing mirror 1; 8, chopping disk; 9, rotation drive part; 10, output mirror; 11, turning mirror 2; 12, focusing mirror 2; 13, limiting plate; 14, protection box; 15, optical bridge fixing tube; 16, extension plate; 17, fixing plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment:

[0024] Please refer to Figure 1-2 , a Q-switching resonator structure, including a tail mirror 2, a discharge tube 1, a turning mirror 1, a discharge tube 2, a focusing mirror 1, an output mirror 10, a turning mirror 2, a focusing mirror 2, and a chopping component. A tail mirror 2 and a turning mirror 1 are respectively arranged at both ends of the discharge tube 1, an output mirror 10 and a turning mirror 2 are respectively arranged at both ends of the discharge tube 2, the turning mirror 1 and the turning mirror 2 are arranged opposite to each other, a focusing mirror 1 and a focusing mirror 2 are arranged between the turning mirror 1 and the turning mirror 2, the focusing mirror 1 and the focusing mirror 2 can focus the light beam, the turning mirror 1 is used to turn the light transmitted in the discharge tube 1 to the focusing mirror 1, and the turning mirror 2 is used to turn the light at the focusing mirror 2 to the inside of the discharge tube 2.

[0025] The chopping component includes a chopping disk 8 and a rotation driving part 9. The output shaft of the rotation driving part 9 is connected to the chopping disk 8. The chopping disk 8 is located at the focusing positions of the first focusing mirror 7 and the second focusing mirror 12. A number of notches for chopping are provided on the chopping disk 8. The chopping position of the chopping disk 8 is located at the focusing positions of the first focusing mirror 7 and the second focusing mirror 12. In use, the rotation driving part 9 is fixed on a supporting frame body, or the rotation driving part 9 is connected to the second end plate 4. The diameters of the first focusing mirror 7 and the second focusing mirror 12 are larger than the light passing diameter. The first discharge tube 3 and the second discharge tube 6 have the structures disclosed in existing lasers, such as the patent with the patent application number CN2 end plate 18 turning mirror two 11599 protective box 142.9 disclosed by our company, which discloses the light transmission structure in a partial resonant cavity. The rotation driving part 9 is a motor, preferably an electric motor. By chopping at the turning position through the chopping disk 8, it can adapt to reducing the change of light at the direct output end. The original integral corner mirror is disassembled, and the first turning mirror 5, the first focusing mirror 7, the second turning mirror 11 and the second focusing mirror 12 form a light turning structure. The light is chopped at the turning position, which is suitable for adjusting the light at the second discharge tube 6, making the output light more stable. The chopping position is installed at the turning position, which is suitable for chopping inside the light transmission path, improving the connection effect between the chopping position and the turning position, and being suitable for installing both the chopping position and the turning position in a relatively enclosed environment, which is beneficial for protection. The structure is simplified, one window mirror is reduced, the laser energy loss is reduced, the optical path adjustment is simple, and it is beneficial to improve the stable laser output characteristics.

[0026] The chopping disk 8 and the optical axis of the beam supported by the first focusing mirror 7 are arranged at an angle. When the set power (discharge current) is too high, dazzling white light is generated when the chopping disk cuts the focused light spot. Although the pulse waveform is not significantly affected, the output power at this time decreases. This is because the photon density in the cavity is relatively high, and the chopping disk is equivalent to the output mirror 10, resulting in photons oscillating back and forth between the total reflection mirror and the chopping disk to generate laser. This situation consumes the inversion population in the cavity, reducing the output power. By deviating the axis of the chopping disk from the optical axis of the laser by an angle, that is, artificially tilting the surface of the chopping disk with respect to the optical axis, laser output will not be formed between the total reflection mirror and the chopping disk, reducing the generation of dazzling white light.

[0027] The first focusing mirror 7 and the second focusing mirror 12 can focus the beam at a point. The chopping position of the chopping disk 8 is located at the beam focusing position of the first focusing mirror 7 and the second focusing mirror 12. The first focusing mirror 7 and the second focusing mirror 12 focus on the same point. By setting the chopping disk 8 at the chopping position, the transmitted light energy is chopped at the chopping disk 8 at the focusing position, which can adapt to the relatively small area of the chopping position and improve the chopping adaptation effect.

[0028] In one embodiment, the rotation driving part 9 is an ultra-high-speed spindle motor. Through the driving effect of the ultra-high-speed spindle motor, the chopping frequency can be increased, which is beneficial to improving the adaptability at the chopping point.

[0029] This Q-switching resonant cavity structure further includes a support assembly. The support assembly includes a first end plate 1, a second end plate 4, a protective box 14, a light bridge fixing tube 15, and a fixing plate 17. The first end plate 1 and the second end plate 4 are connected by a plurality of light bridge fixing tubes 15. A plurality of protective boxes 14 are connected to the second end plate 4. The first turning mirror 5 and the first focusing mirror 7 are connected to the same protective box 14. The second turning mirror 11 and the second focusing mirror 12 are connected to the same protective box 14. A fixing plate 17 is connected between the plurality of light bridge fixing tubes 15. The tail mirror 2 and the output mirror 10 are installed on the first end plate 1. A support structure for supporting the tail mirror 2, the first discharge tube 3, the first turning mirror 5, the first focusing mirror 7, the second turning mirror 11, the second focusing mirror 12, the second discharge tube 6, and the output mirror 10 is formed by the first end plate 1, the second end plate 4, the protective box 14, the light bridge fixing tube 15, and the fixing plate 17, which can improve the support effect on each part.

[0030] Wherein, the support assembly further includes a limiting plate 13 and an extension plate 16. The limiting plate 13 is connected to the fixing plate 17. A plurality of light bridge fixing tubes 15 are located between the limiting plate 13 and the fixing plate 17. Positioning grooves corresponding to the light bridge fixing tubes 15 are provided on the limiting plate 13 and the fixing plate 17. A plurality of extension plates 16 are connected to the fixing plate 17. The first discharge tube 3 and the second discharge tube 6 are connected to the corresponding extension plates 16. Through the cooperation between the limiting plate 13 and the fixing plate 17, the connection strength between the light bridge fixing tubes 15 is enhanced, and the connection part of the limiting plate 13 and the fixing plate 17 is convenient to disassemble.

[0031] Wherein, the rotation driving part 9 can perform frequency conversion control. Preferably, the rotation driving part 9 is electrically connected to a frequency converter for controlling the rotation speed of the rotation driving part 9. Through the effect of frequency conversion control, it can be adapted to the control of more frequencies and improve the adaptability.

[0032] During use, the rotation driving part 9 is fixed on a supporting frame, or the rotation driving part 9 is connected to the second end plate 4. The light is transmitted through the tail mirror 2, the first discharge tube 3, the first turning mirror 5, the first focusing mirror 7, the second focusing mirror 12, the second turning mirror 11, the second discharge tube 6, and the output mirror 10. The rotation driving part 9 is started, and the rotation driving part 9 drives the chopping disc 8 to perform chopping operation on the laser.

[0033] It should be noted that phrases such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Moreover, such phrases do not necessarily refer to the same embodiment. Additionally, when describing a specific feature, structure, or characteristic in combination with an embodiment, it is within the knowledge scope of those skilled in the art to implement such a feature, structure, or characteristic in combination with other embodiments, whether explicitly or implicitly described.

[0034] It should be readily understood that the terms "on", "above", and "upon" in this disclosure should be interpreted in the broadest manner such that "on" not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above" or "upon" not only include the meaning of "above" or "upon something", but may also include the meaning of "above" or "upon something" with no intermediate features or layers therebetween (i.e., directly on something).

[0035] Furthermore, for ease of description, spatial relative terms may be used in the text, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature to another element or feature as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the drawings. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used in the text may be interpreted accordingly.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include", or any other variant thereof are intended to cover non - exclusive inclusion, such that a process, method, article, or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the said element.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A Q - switched resonator structure, characterized in that: It includes a tail mirror (2), a first discharge tube (3), a first turning mirror (5), a second discharge tube (6), a first focusing mirror (7), an output mirror (10), a second turning mirror (11), a second focusing mirror (12) and a chopping assembly. A tail mirror (2) and a first turning mirror (5) are respectively arranged at both ends of the first discharge tube (3). An output mirror (10) and a second turning mirror (11) are respectively arranged at both ends of the second discharge tube (6). The first turning mirror (5) and the second turning mirror (11) are arranged oppositely. A first focusing mirror (7) and a second focusing mirror (12) are arranged between the first turning mirror (5) and the second turning mirror (11). The first focusing mirror (7) and the second focusing mirror (12) can focus the light beam. The first turning mirror (5) is used to turn the light transmitted in the first discharge tube (3) to the first focusing mirror (7). The second turning mirror (11) is used to turn the light at the second focusing mirror (12) into the second discharge tube (6). The chopping assembly includes a chopping disk (8) and a rotation driving part (9). The output shaft of the rotation driving part (9) is connected to the chopping disk (8). The chopping disk (8) is at the focusing position of the first focusing mirror (7) and the second focusing mirror (12).

2. The Q-switching resonant cavity structure according to claim 1, characterized in that: The chopping disk (8) is arranged at an angle with the beam axis supported and propagated by the first focusing mirror (7).

3. The Q-switching resonant cavity structure according to claim 1, wherein: The first focusing mirror (7) and the second focusing mirror (12) can focus the light beam at one point. The chopping position of the chopping disk (8) is at the light beam focusing position of the first focusing mirror (7) and the second focusing mirror (12).

4. The Q-switching resonant cavity structure according to claim 1, characterized in that: The rotation driving part (9) is an ultra-high-speed spindle motor.

5. A Q - switched resonant cavity structure according to claim 1, characterized in that: It further includes a support assembly. The support assembly includes a first end plate (1), a second end plate (4), a protective box (14), a light bridge fixing tube (15) and a fixing plate (17). The first end plate (1) and the second end plate (4) are connected by a plurality of light bridge fixing tubes (15). A plurality of protective boxes (14) are connected to the second end plate (4). The first turning mirror (5) and the first focusing mirror (7) are connected to the same protective box (14). The second turning mirror (11) and the second focusing mirror (12) are connected to the same protective box (14). A fixing plate (17) is connected between the plurality of light bridge fixing tubes (15). The tail mirror (2) and the output mirror (10) are installed on the first end plate (1).

6. The Q-switching resonant cavity structure according to claim 5, characterized in that: The support assembly further includes a limiting plate (13) and an extension plate (16). The limiting plate (13) is connected to the fixing plate (17). The plurality of light bridge fixing tubes (15) are located between the limiting plate (13) and the fixing plate (17). Positioning grooves corresponding to the light bridge fixing tubes (15) are provided on the limiting plate (13) and the fixing plate (17). A plurality of extension plates (16) are connected to the fixing plate (17). The first discharge tube (3) and the second discharge tube (6) are connected to the corresponding extension plates (16).

7. A Q-switching resonator structure according to claim 1, wherein: The rotation driving part (9) can perform frequency conversion control.

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