CN214124305U - Lath laser - Google Patents
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- CN214124305U CN214124305U CN202022467736.3U CN202022467736U CN214124305U CN 214124305 U CN214124305 U CN 214124305U CN 202022467736 U CN202022467736 U CN 202022467736U CN 214124305 U CN214124305 U CN 214124305U
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Abstract
The utility model discloses a slab laser, which comprises a slab crystal group, a reflector group, a pumping device (4), a cooler and a resonant cavity; the cooler is provided with the narrow-band-shaped strip crystal group, the resonant cavity comprises a resonant cavity reflector (5) and a resonant cavity output mirror (6), and the resonant cavity reflector (5), the strip crystal group and the resonant cavity output mirror (6) are coaxially arranged; the reflector group comprises at least one reflector (3), and the reflector (3) is used for being matched with the slab crystal group so as to enable the pump light and the laser to propagate according to a set route. The utility model discloses improved the lath structure, utilized lath crystal group and speculum group cooperation, optimized the heat distribution and the heat transfer route of crystal, the maximum temperature of convenient accurate measurement crystal has improved the output and the light beam quality of laser instrument, is favorable to improving the safe operation limit of laser instrument.
Description
Technical Field
The utility model relates to a solid laser technical field especially relates to a lath laser.
Background
In the research of high-power solid laser technology, pumping is used as an energy supply source of high-power laser, and the development of pumping technology has attracted general attention. The main pumping modes of the current slab laser are as follows: end pumping, side pumping and pumping with large area on the upper and lower surfaces. Among the numerous pumping technologies, the end-pumped technology has become one of the most rapidly developed pumping technologies, and has the following advantages: the transmission path of the pump light and the transmission path of the laser are mutually overlapped or parallel, and the modes of the pump light and the transmission path of the laser can be matched, so that the laser output with high efficiency and high beam quality is facilitated.
However, the end-pumped coupling device also has the disadvantages of complicated structure, difficult shaping of the pump beam, and the like. In addition, the existing slab laser generally adopts a packaging mode that two large faces are tightly attached to a cooling heat sink, the heat is concentrated and is not easy to diffuse, and based on the structural limitation, the slab laser generally has the problem that the temperature inside a crystal cannot be directly measured, so that great hidden danger is brought to high-power operation of the laser.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a lath laser for improve lath laser structure, optimize the heat distribution and the heat transfer route of crystal, the maximum temperature of convenient accurate measurement crystal is favorable to improving the safe operation limit of laser instrument.
The embodiment of the utility model provides a slab laser, including, slab crystal group, speculum group, pumping device, cooler and resonant cavity;
the cooler is provided with the slab crystal group, the resonant cavity comprises a resonant cavity reflector and a resonant cavity output mirror, and the resonant cavity reflector, the slab crystal group and the resonant cavity output mirror are coaxially arranged;
the pumping device is used for emitting pumping light and transmitting the pumping light to the slab crystal group;
the reflecting mirror group comprises at least one reflecting mirror, the at least one reflecting mirror is arranged on one side of the slab crystal group, and the reflecting mirror is used for being matched with the slab crystal group so as to enable the pumping light and the laser to be transmitted according to a set route.
Optionally, the cooler comprises a cooling heat sink, and the slab crystal group comprises a plurality of laser crystals in narrow band shapes;
the laser crystals are arranged close to the cooling surface of the cooling heat sink at intervals;
and a micro-channel structure is arranged in the cooling heat sink at a position corresponding to the laser crystal and used for cooling the laser crystal.
Optionally, the slab crystal group is arranged on one cooling surface or two opposite cooling surfaces of the cooling heat sink;
the surfaces corresponding to the length and the width of the laser crystals are closely attached to the cooling surface of the cooling heat sink (1) at intervals.
Optionally, the width of the plurality of laser crystals is different, and the length and the thickness of the plurality of laser crystals are the same, the thickness range of the laser crystals is 200 μm to 500 μm, and the distance range between two adjacent laser crystals is 5mm to 10 mm.
Optionally, the tips of the laser crystals located first and last are beveled.
Optionally, the doping concentrations of the laser crystals are different, and the doping concentration of the laser crystals is increased and then decreased along the length direction of the cooling heat sink.
Optionally, the micro-channel structures corresponding to the laser crystals are independent from each other, and the structural parameters of the micro-channel structures are determined according to the heating values of the corresponding laser crystals.
Optionally, the surface of the laser crystal, which is attached to the cooling surface, is plated with a total reflection film of the pump light and the laser;
the middle part of the opposite surface of the bonding surface of the laser crystal and the cooling surface is plated with a full reflection film of the pump light and the laser, and the two side parts are plated with reflection reducing films of the pump light and the laser;
and the surface of the reflector group is plated with a total reflection film of the pump light and the laser.
Optionally, the pumping device is disposed at one side of the first and/or last laser crystal of the slab crystal group, and pumping light emitted by the pumping device passes through the outer large surface of the first and/or last laser crystal and is incident into the slab crystal group.
The embodiment of the utility model provides a through improving the lath structure, utilize lath crystal group and speculum group cooperation, optimized the heat distribution and the heat transfer route of crystal, the highest temperature of convenient accurate measurement crystal is favorable to improving the safe operation limit of laser instrument.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of an arrangement of slab-shaped crystal groups according to an embodiment of the present invention;
FIG. 2 is another arrangement of slab-shaped crystal groups according to an embodiment of the present invention;
fig. 3 is a schematic diagram of the internal structure of the heat sink according to the embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Examples
The existing slab laser has certain defects, and mainly comprises the following points: (1) in end pumping, pumping light needs to be shaped into a very narrow collimated elongated strip, the requirement on the quality of light beams is high, the difficulty in shaping the light beams is high, and the improvement of the maximum pumping power is limited due to the small pumping area; (2) the undoped crystal and the doped crystal are generally formed into a whole by using a bonding process, and the bonding surface has a large influence on the output laser power and the beam quality, which puts high requirements on the bonding process of the strip. The two sides of the bonding surface of the crystal have great temperature gradient, and the situation of breakage at the bonding position often occurs, so that the safe operation of the lath is influenced. (3) The slab laser generally adopts a packaging mode that two large faces are tightly attached to a cooling heat sink, and based on the structural limitation, the slab laser generally has the problem that the temperature in a crystal cannot be directly measured, so that great hidden danger is brought to high-power operation of the laser.
Based on this, the embodiment of the present invention provides a slab laser, as shown in fig. 1 and 2, including a slab crystal group, a reflector group, a pumping device 4, a cooler and a resonant cavity;
the cooler is provided with the slab crystal group, the resonant cavity comprises a resonant cavity reflector 5 and a resonant cavity output mirror 6, and the resonant cavity reflector 5, the slab crystal group and the resonant cavity output mirror 6 are coaxially arranged;
the pumping device 4 is used for emitting pumping light and transmitting the pumping light into the slab crystal group;
the reflector group comprises at least one reflector 3, the at least one reflector 3 is arranged on one side of the slab crystal group, and the reflector 3 is used for being matched with the slab crystal group so as to enable the pumping light and the laser to be transmitted according to a set route.
The embodiment of the utility model provides a through improving the lath structure, utilize lath crystal group and speculum group cooperation, optimized the heat distribution and the heat transfer route of crystal, the highest temperature of convenient accurate measurement crystal is favorable to improving the safe operation limit of laser instrument.
Optionally, the cooler comprises a cooling heat sink 1;
the slab crystal group comprises a plurality of narrow-band laser crystals 2, and the narrow-band laser crystals 2 are arranged close to the cooling surface of the cooling heat sink 1 at intervals;
the inside of the cooling heat sink 1 corresponding to the position of the laser crystal 2 is provided with a micro-channel structure, and the micro-channel structure is used for cooling the laser crystal 2.
As shown in fig. 1 and 2, the slab crystal group may include a plurality of laser crystals 2, and the plurality of laser crystals 2 are disposed at intervals close to the cooling surface of the cooling heat sink 1. The inside of the cooling heat sink 1 corresponding to the position of the laser crystal 2 is provided with a micro-channel structure, and the micro-channel structure is used for cooling the laser crystal 2.
On the basis of the foregoing embodiments, in the present embodiment, the mirror group may be disposed on one side of the slab crystal group, and the mirror group may be composed of a series of mirrors 3 with surfaces coated with the pumping light and the laser total reflection film. The mirror 3 is used to cooperate with the laser crystal 2 to route the pump light. The specific pumping device 4 couples and shapes the pumping light, then enters the slab crystal group through the area coated with the antireflection film on the large surface of the outer side of the laser crystal 2, the reflector 3 is used for reflecting the light beam reflected by the laser crystal 2 to the adjacent laser crystal 2, the light beam is transmitted along the Z-shaped light path, then leaves the laser crystal 2 from the other area coated with the antireflection film of the laser crystal 2, is reflected by the reflector 3, enters the next laser crystal 2, and the like until the light beam is completely absorbed. The resonator mirror 5 and the resonator output mirror 6 constitute a resonator. Laser light formed by the slab laser crystal group can be resonated in the resonant cavity so as to achieve the required laser light and output from the output mirror of the resonant cavity.
One specific setting mode may be: the reflecting mirror 3 is arranged between every two laser crystals 2 and is used for reflecting the light beam emitted by the current laser crystal 2 to the adjacent laser crystal 2 again.
Optionally, the slab crystal group is disposed on one cooling surface or two opposite cooling surfaces of the cooling heat sink 1, and the surfaces corresponding to the length and width of the plurality of laser crystals 2 are closely attached to the cooling surface of the cooling heat sink 1 at intervals.
As shown in fig. 1, the large surfaces of each laser crystal 2 in the length direction and the width direction of the slab crystal group are closely attached to the cooling heat sink 1, and the other large surface is exposed in the air, and the specific attachment manner can be completed by welding, that is, one large surface of each laser crystal 2 in the length direction and the width direction is welded to the cooling surface of the cooling heat sink 1. As shown in fig. 1, a slab crystal group is welded to one cooling surface of the cooling heat sink 1, and certainly, as shown in fig. 2, slab crystal groups are welded to two opposite cooling surfaces of the cooling heat sink 1, and the specific welding manner may be set according to actual situations.
Optionally, the width of the plurality of laser crystals is different, and the length and the thickness of the plurality of laser crystals are the same, the thickness range of the laser crystals is 200 μm to 500 μm, and the distance range between two adjacent laser crystals is 5mm to 10 mm.
Specifically, the slab crystal group may be composed of laser crystals 2 having the same thickness and length and different widths, the laser crystals 2 of the slab crystal group are separated by a certain distance, for example, the distance between two adjacent sides is 5mm to 10mm, the thickness of each laser crystal 2 is the same, and the thickness range of the laser crystal in this embodiment may be 200 μm to 500 μm. The laser crystals in the slab crystal group are spaced at a certain distance, the cooling of the laser crystals is not affected, the surface of the laser crystal 2 tightly attached to the cooling heat sink 1 is the surface corresponding to the length and the width of the laser crystal 2, namely the large surface of the laser crystal 2, and certainly the other corresponding large surface is exposed in the air. Adopt the utility model discloses an interval arrangement mode has dispersed a plurality of contactless heat sources each other on heat sink cooling surface equivalently, and the highest temperature of laser crystal can effectively be reduced to this kind of discontinuous arrangement mode.
The thickness of each laser crystal in the lath crystal group is thin, the large surface of each laser crystal opposite to the cooling surface is exposed in the air, and the surface is also the position of the highest temperature of the laser crystal, so that the highest temperature in the laser crystal can be intuitively and accurately measured through the thermal infrared imager, and the method has great significance for the safe operation of the laser crystal.
Optionally, the tips of the laser crystals 2 located first and last are beveled.
Specifically, the end of the first and the last laser crystal 2 is cut with a bevel, that is, the cross section of the first laser crystal 2 and the cross section of the last laser crystal 2 are trapezoidal, and the cross section of the other laser crystals are rectangular.
Optionally, the doping concentrations of the laser crystals are different.
Specifically, the laser crystal 2 may be Yttrium Aluminum Garnet (YAG) doped with a rare earth element (Nd3+, Er3+, Yb3+, etc.) and the doping concentrations are different.
The utility model discloses the laser crystal among the lath crystal group no longer needs bonding technology, also does not have the bonding face, has eliminated the bonding face and has influenced laser beam quality.
Optionally, the doping concentration of the laser crystal is increased and then decreased along the length direction of the heat sink.
Specifically, the doping manner of the laser crystal to be doped may be that, with reference to the laser crystal located in the middle, the doping concentrations of the laser crystals located on both sides of the laser crystal located in the middle are gradually decreased, that is, the doping concentration of the laser crystal located in the middle is the highest. That is, the doping concentration from the first laser crystal to the last laser crystal increases and then decreases.
The utility model discloses a lath crystal organizes each laser crystal's doping concentration different, and through the matching of laser crystal's doping concentration and laser crystal's length, the heat flux density of 2 big surface departments of cooling laser crystal that can ensure each laser crystal is completely unanimous to ensure that each laser crystal's temperature is unanimous basically.
The utility model discloses the cooling structure of cooler can realize corresponding cooling to every laser crystal 2, and the calorific capacity of channel shape, structural parameter and cooling flow and crystal matches completely, and each laser crystal's cooling effect does not influence each other.
Optionally, the micro-channel structures corresponding to the laser crystals are independent from each other, and the structural parameters of the micro-channel structures are determined according to the heat productivity of the corresponding laser crystals.
Specifically, as shown in fig. 3, the cooling heat sink 1 includes a plurality of cooling cavities therein, the cooling cavities 8 accommodate the micro-channel structures, the micro-channel structures inside the cooling heat sink 1 are independent of each other through the cooling cavities 8, and the channel shape, width and height of the micro-channel structures inside the micro-channel cooling cavities 8 may be determined according to the heat generation amount of the laser crystals 2, thereby ensuring that the laser crystals 2 with different lengths have the same cooling effect.
The specific structure of the cooling heat sink 1 may further include a cooling liquid inlet 7 and a cooling liquid outlet 9 located on both sides of the cooling heat sink 1, and the cooling liquid enters the cooling structure from the cooling liquid inlet 7, then is distributed to each independent micro-channel cooling cavity, then is merged to the vicinity of the cooling liquid outlet 9, and flows out from the cooling liquid outlet 9.
Optionally, the surface of the laser crystal 2, which is attached to the cooling surface, is plated with a full-reflection film;
the middle part of the opposite surface of the laser crystal 2 and the cooling surface attaching surface is plated with a full reflection film of the pump light and the laser, and the two side parts are plated with antireflection films of the pump light and the laser.
Specifically, the large surface of each laser crystal 2 in contact with the heat sink is completely plated with a pump light and laser total reflection film, the middle position of the large surface of each laser crystal 2 exposed in the air is plated with a pump light and laser total reflection film, and the rest positions are plated with pump light and laser antireflection films.
Optionally, the pumping device is disposed at one side of the first and last laser crystals of the slab crystal group, and pumping light emitted by the pumping device is incident into the slab crystal group through the inclined planes of the first and last laser crystals.
As shown in fig. 2, a plurality of, for example two, pumping devices 4 may be provided, and are respectively provided on one side of the first and last laser crystals, and the pumping light emitted by the pumping devices 4 is incident into the slab crystal group through the outer large surface of the first and last laser crystals.
To sum up, the utility model discloses a lath laser has following advantage:
1. each crystal in the slab crystal group is YAG doped with rare earth elements, the structure does not need a bonding process any more, and a bonding surface does not exist, so that the influence of the bonding surface on the quality of a laser beam is eliminated.
2. The doping concentration of each crystal in the slab crystal group is different, and the heat flux density at the large cooling surface of each crystal can be ensured to be completely consistent through the matching of the doping concentration of the slab and the width of the slab, so that the temperature of each crystal is ensured to be basically consistent.
4. The heat sink cooling surface is distributed with a plurality of heat sources which are not contacted with each other, and the discontinuous arrangement mode can effectively reduce the highest temperature of the crystals.
5. The thickness of each laser crystal in the lath crystal group is thin, the large surface of the laser crystal opposite to the cooling surface is exposed in the air, and the large surface of the laser crystal is also the position of the highest temperature of the crystal, so that the highest temperature in the crystal can be intuitively and accurately measured by an infrared thermal imager, and the method has great significance for the safe operation of the crystal.
6. The cooling structure in the embodiment can realize targeted cooling on each crystal, the channel shape, the structural parameters and the cooling flow are completely matched with the heat productivity of the crystal, the cooling effects of the crystals are not affected with each other, and the influence of the temperature gradient in the thickness direction of the crystal on the laser is eliminated through the Z-shaped laser light path and the pump light path.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (9)
1. A slab laser is characterized by comprising a slab crystal group, a reflector group, a pumping device (4), a cooler and a resonant cavity;
the cooler is provided with the slab crystal group, the resonant cavity comprises a resonant cavity reflector (5) and a resonant cavity output mirror (6), and the resonant cavity reflector (5), the slab crystal group and the resonant cavity output mirror (6) are coaxially arranged;
the pumping device (4) is used for emitting pumping light and transmitting the pumping light into the slab crystal group;
the reflecting mirror group comprises at least one reflecting mirror (3), the at least one reflecting mirror (3) is arranged on one side of the slab crystal group, and the reflecting mirror (3) is used for being matched with the slab crystal group so that the pumping light and the laser light are transmitted according to a set route.
2. The slab laser according to claim 1, characterized in that the cooler comprises a cooling heat sink (1), the slab crystal group comprising a plurality of laser crystals (2) in the form of narrow strips;
the laser crystals (2) are arranged close to the cooling surface of the cooling heat sink (1) at intervals;
and a micro-channel structure is arranged in the cooling heat sink (1) corresponding to the laser crystal (2), and is used for cooling the laser crystal (2).
3. Slab laser according to claim 2, characterized in that the slab crystal group is arranged on one cooling face or on two opposite cooling faces of the cooling heat sink (1);
the surfaces corresponding to the length and the width of the laser crystals (2) are closely attached to the cooling surface of the cooling heat sink (1) at intervals.
4. A slab laser according to claim 3, characterized in that a plurality of said laser crystals (2) have different widths, same lengths and same thicknesses, said laser crystals (2) having a thickness in the range of 200 μm to 500 μm and two adjacent laser crystals (2) having a pitch in the range of 5mm to 10 mm.
5. A slab laser according to claim 2, characterized in that the ends of the laser crystals (2) situated first and last are beveled.
6. A slab laser according to claim 2, characterized in that the doping concentrations of the laser crystals (2) are different, increasing and decreasing along the length of the cooling heat sink (1).
7. A slab laser according to any of claims 2-6, characterized in that the micro-channel structures corresponding to the individual laser crystals (2) are independent of each other and that the structural parameters of the micro-channel structures are determined in dependence on the heating power of the corresponding laser crystal (2).
8. The slab laser according to any of claims 2 to 6,
the surface of the laser crystal (2) which is attached to the cooling surface is plated with a total reflection film of pump light and laser;
the middle part of the opposite surface of the laser crystal (2) and the cooling surface attaching surface is plated with a total reflection film of the pump light and the laser, and the two side parts are plated with antireflection films of the pump light and the laser;
and the surface of the reflector group is plated with a total reflection film of the pump light and the laser.
9. A slab laser according to any of claims 2-6, characterized in that the pumping means (4) is arranged on one side of the first, and/or last, laser crystal (2) of the slab crystal group, and that the pumping light emitted by the pumping means (4) is incident into the slab crystal group via the outer large surface of the first, and/or last, laser crystal (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022467736.3U CN214124305U (en) | 2020-10-30 | 2020-10-30 | Lath laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022467736.3U CN214124305U (en) | 2020-10-30 | 2020-10-30 | Lath laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214124305U true CN214124305U (en) | 2021-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022467736.3U Active CN214124305U (en) | 2020-10-30 | 2020-10-30 | Lath laser |
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| CN (1) | CN214124305U (en) |
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- 2020-10-30 CN CN202022467736.3U patent/CN214124305U/en active Active
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