Gaussian distribution non-uniform water circulation cooling device for laser crystal

Abstract

A Gaussian distribution non-uniform water circulation cooling device for laser crystals belongs to the technical field of solid lasers, and comprises a copper water cooling block which adopts a Gaussian distribution non-uniform water circulation cooling structure, and a cooling water channel in the copper water cooling block adopts a non-uniform distribution form; in the central cooling plane of the copper water cooling block, the cooling water channel is distributed in a symmetrical hyperbola manner; in any cross section of the copper water cooling block, a horizontal axis projection point of an intersection point of a Gaussian energy curve of a laser beam and a longitudinal axis isothermal spacing line is overlapped with a round point of cooling water channel section holes which are arranged in a straight line; through the copper water cooling block of a Gaussian distribution non-uniform water circulation cooling structure, a laser beam energy concentration area can directly face a cooling water channel concentration area, the cooling capacity of the laser beam energy concentration area is improved, the temperature gradient of the laser crystal is effectively weakened, the thermal strain of the laser crystal is reduced, and the thermal stress birefringence phenomenon is improved; and the output power and quality of the laser beam are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of solid lasers, and in particular relates to a Gaussian-type distributed non-uniform water circulation cooling device for laser crystals. Background Art

[0002] During the operation of a solid-state laser system, its laser crystal will generate high heat, so the laser crystal needs to be cooled synchronously.

[0003] At present, laser crystals are mainly cooled by copper water-cooling blocks. Evenly distributed cooling water channels are processed inside the copper water-cooling blocks. The cooling water channels are used for the circulation of cooling water. With the help of the efficient heat conduction of the copper water-cooling blocks, the circulating cooling water will continuously take away the heat generated by the laser crystal, thereby achieving efficient heat dissipation of the laser crystal.

[0004] However, research has found that since the cooling water channels inside the copper water-cooling block are evenly arranged, the thermal conductivity of each area of ​​the copper water-cooling block is also uniform. However, when the laser beam passes through the laser crystal, the temperature distribution of the laser crystal is uneven, that is, there is a large temperature gradient, and the large temperature gradient will cause thermal strain in the laser crystal. When the laser beam passes through the thermally strained laser crystal, the refractive index of the laser beam will change under the photoelastic effect, and change from the original isotropy to anisotropy, which is thermal stress birefringence.

[0005] Therefore, the generation of thermal stress birefringence will have a significant impact on the propagation properties of the laser beam, not only reducing the output power of the laser beam, but also destroying the quality of the laser beam. Summary of the invention

[0006] In view of the problems existing in the prior art, the present invention provides a Gaussian distribution non-uniform water circulation cooling device for laser crystals, wherein the cooling water channels inside the copper water cooling block are in a non-uniform distribution form; in the central cooling plane of the copper water cooling block, the cooling water channels are in a symmetrical hyperbolic distribution; in any cross section of the copper water cooling block, the horizontal axis projection point of the intersection point of the Gaussian energy curve of the laser beam and the longitudinal axis isothermal spacing line coincides with the circular point of the cross-sectional holes of the cooling water channels arranged in series; through the copper water cooling block with a Gaussian distribution non-uniform water circulation cooling structure, the laser beam energy concentration area can be directly opposite to the cooling water channel dense area, thereby improving the cooling capacity of the laser beam energy concentration area, effectively weakening the temperature gradient of the laser crystal, reducing the thermal strain of the laser crystal, improving the thermal stress birefringence phenomenon, and thereby improving the output power and quality of the laser beam.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a Gaussian distribution non-uniform water circulation cooling device for a laser crystal, comprising a copper water cooling block, the copper water cooling block and the laser crystal are tightly stacked together, a cooling water channel is arranged inside the copper water cooling block, and the cooling water channel is distributed along the central cooling plane of the copper water cooling block; its characteristics are: the copper water cooling block adopts a Gaussian distribution non-uniform water circulation cooling structure, the cooling water channel adopts a non-uniform distribution form, and the cooling water channel is symmetrically hyperbolically distributed in the central cooling plane of the copper water cooling block.

[0008] In any cross section of the copper water-cooling block, the horizontal axis projection point of the intersection point of the Gaussian energy curve of the laser beam and the longitudinal isothermal spacing line coincides with the circular point of the cooling water channel cross-sectional holes arranged in series.

[0009] The symmetrical hyperbolic central axis of the cooling water channel is parallel to the optical axis of the laser beam passing through the laser crystal.

[0010] The coaxial plane where the symmetrical hyperbolic central axis of the cooling water channel and the optical axis of the laser beam passing through the laser crystal are located is perpendicular to the central cooling plane of the copper water cooling block.

[0011] Beneficial effects of the present invention:

[0012] The laser crystal of the present invention uses a Gaussian distribution non-uniform water circulation cooling device, wherein the cooling water channels inside the copper water cooling block are in a non-uniform distribution form; within the central cooling plane of the copper water cooling block, the cooling water channels are in a symmetrical hyperbolic distribution; within any cross section of the copper water cooling block, the horizontal axis projection point of the intersection point of the Gaussian energy curve of the laser beam and the longitudinal axis isothermal spacing line coincides with the circular point of the cross-sectional holes of the cooling water channels arranged in series; through the copper water cooling block with a Gaussian distribution non-uniform water circulation cooling structure, the laser beam energy concentration area can be directly opposite to the cooling water channel dense area, thereby improving the cooling capacity of the laser beam energy concentration area, effectively weakening the temperature gradient of the laser crystal, reducing the thermal strain of the laser crystal, improving the thermal stress birefringence phenomenon, and thus improving the output power and quality of the laser beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural principle diagram of a Gaussian distribution non-uniform water circulation cooling device for laser crystals of the present invention;

[0014] Figure 2 for Figure 1 AA section view in;

[0015] Figure 3 Temperature gradient diagram of laser crystal when using Gaussian distribution non-uniform water circulation cooling structure and traditional uniform water circulation cooling structure for copper water cooling block

[0016] In the figure, 1 is a copper water cooling block, 2 is a laser crystal, 3 is a cooling water channel, 4 is a central cooling plane, 5 is a cross-sectional hole of a cooling water channel, 6 is a Gaussian energy curve, and 7 is a longitudinal isothermal spacing line. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 , 2 As shown, a Gaussian distribution non-uniform water circulation cooling device for a laser crystal comprises a copper water cooling block 1, the copper water cooling block 1 and the laser crystal 2 are tightly stacked together, a cooling water channel 3 is arranged inside the copper water cooling block 1, and the cooling water channel 3 is distributed along the central cooling plane 4 of the copper water cooling block 1; its characteristics are: the copper water cooling block 1 adopts a Gaussian distribution non-uniform water circulation cooling structure, the cooling water channel 3 adopts a non-uniform distribution form, and in the central cooling plane 4 of the copper water cooling block 1, the cooling water channel 3 is symmetrically hyperbolicly distributed.

[0019] In any cross section of the copper water-cooling block 1 , the horizontal axis projection point of the intersection of the Gaussian energy curve 6 of the laser beam and the longitudinal isothermal spacing line 7 coincides with the circular point of the cooling water channel cross-sectional holes 5 arranged in series.

[0020] The central axis of the symmetrical hyperbola of the cooling water channel 3 is parallel to the optical axis of the laser beam passing through the laser crystal 2 .

[0021] The coaxial plane where the central axis of the symmetrical hyperbola of the cooling water channel 3 and the optical axis of the laser beam passing through the laser crystal 2 are located is perpendicular to the central cooling plane 4 of the copper water-cooling block 1 .

[0022] When in use, first connect the cooling water channel 3 inside the copper water-cooling block 1 to the cooling water circulation system. Since the copper water-cooling block 1 adopts a Gaussian-type distributed non-uniform water circulation cooling structure, after circulating cooling water is introduced into the cooling water channel 3, the cooling water channel 3 is more densely distributed in the waist area where the symmetrical hyperbolic central axis of the cooling water channel 3 is located. When the laser beam passes through the laser crystal 2, since the energy concentration area of ​​the laser beam is also located in the waist area, the heat generated by the laser crystal 2 in this area is also higher. If the cooling water channel 3 still adopts the traditional uniform distribution form, since the thermal conductivity of each area of ​​the copper water-cooling block 1 is uniform, the heat dissipation rate of the high heat generating area of ​​the laser crystal 2 will be lower, which will cause a more obvious temperature gradient and ultimately produce thermal stress birefringence.

[0023] However, the densely distributed area of ​​the cooling water channel 3 of the present invention corresponds to the high heat generation area of ​​the laser crystal 2, and the cooling capacity of the densely distributed area of ​​the cooling water channel 3 is also stronger, which can dissipate heat more efficiently. In addition, since the non-uniform distribution form of the cooling water channel 3 is designed based on the Gaussian energy curve 6 of the laser beam, the cooling capacity is accurately matched with the heat capacity of the laser crystal 2 at the overall level, thereby achieving the temperature uniformity of the laser crystal 2 after cooling at the overall level, effectively weakening the temperature gradient of the laser crystal 2, effectively reducing the thermal strain of the laser crystal 2, further improving the thermal stress birefringence phenomenon, and thus improving the output power and quality of the laser beam. Figure 3 As shown, it is a temperature gradient diagram of the laser crystal 2 when the copper water-cooling block 1 adopts a Gaussian distribution non-uniform water circulation cooling structure and a traditional uniform water circulation cooling structure. It can be seen from the figure that when the copper water-cooling block 1 adopts a Gaussian distribution non-uniform water circulation cooling structure, the temperature gradient of the laser crystal 2 is significantly weakened.

[0024] The solutions in the embodiments are not intended to limit the protection scope of the present invention. All equivalent implementations or changes that do not deviate from the present invention are included in the protection scope of the present invention.

Claims

1. A Gaussian-type distributed non-uniform water circulation cooling device for a laser crystal, comprising a copper water-cooling block, the copper water-cooling block and the laser crystal are closely stacked together, a cooling water channel is arranged inside the copper water-cooling block, and the cooling water channel is distributed along the central cooling plane of the copper water-cooling block; characterized in that: The copper water-cooling block adopts a Gaussian distribution non-uniform water circulation cooling structure, and the cooling water channels adopt a non-uniform distribution form. In the central cooling plane of the copper water-cooling block, the cooling water channels are distributed in a symmetrical hyperbolic manner.

2. The Gaussian distribution non-uniform water circulation cooling device for laser crystal according to claim 1, characterized in that: In any cross section of the copper water-cooling block, the horizontal axis projection point of the intersection point of the Gaussian energy curve of the laser beam and the longitudinal isothermal spacing line coincides with the circular point of the cooling water channel cross-sectional holes arranged in series.

3. The Gaussian distribution non-uniform water circulation cooling device for laser crystal according to claim 1, characterized in that: The symmetrical hyperbolic central axis of the cooling water channel is parallel to the optical axis of the laser beam passing through the laser crystal.

4. The Gaussian distribution non-uniform water circulation cooling device for laser crystal according to claim 1, characterized in that: The coaxial plane where the symmetrical hyperbolic central axis of the cooling water channel and the optical axis of the laser beam passing through the laser crystal are located is perpendicular to the central cooling plane of the copper water cooling block.

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