CN102916326B - YAG laser and water-cooling method thereof - Google Patents
YAG laser and water-cooling method thereof Download PDFInfo
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- CN102916326B CN102916326B CN201210384891.6A CN201210384891A CN102916326B CN 102916326 B CN102916326 B CN 102916326B CN 201210384891 A CN201210384891 A CN 201210384891A CN 102916326 B CN102916326 B CN 102916326B
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Abstract
The invention discloses a YAG (Yttrium Aluminum Garnet) laser and a water-cooling method thereof. The laser comprises a water inlet, a cavity, a cavity base, a cooling sleeve, a pressure balancing slot and a jet ring, wherein the jet ring is horizontally fixed on the cooling sleeve through mounting positions at two ends, and supporting points at two ends of the jet ring are sealed by seal rings; and a suspension part in the middle of the jet ring and the inner channel wall of a cooling water channel form the pressure balancing slot. According to the invention, cooling water flows into the laser from the water inlet and is injected into the pressure balancing slot through the cooling water channel; the periphery of the pressure balancing slot is sealed by the seal rings, so that all the pressure of water flowing into the pressure balancing slot through the cooling water channel is exerted on the outer wall of the jet ring; after the pressure balancing slot is fully filled by the cooling water to obtain a certain water pressure, the water pressure is uniformly exerted on the jet ring; under the action of the water pressure, the cooling water forms jet water columns through jet holes uniformly distributed at the periphery of the jet ring, and the jet water columns are uniformly applied to a YAG rod to take a jet cooling effect; and owing to the uniform cooling water columns, the YAG rod is subject to uniform water pressure in the cooling process.
Description
Technical field
The invention belongs to field of lasers, more specifically, relate to the cooling means of a kind of YAG laser and laser water-cooled.
Background technology
At present, the solid state laser of high-power flash lamp pumping is in service at laser, because absorbing a large amount of pumping luminous energy, YAG rod produces localized heat stress and thermal deformation, cause that beam reflection light field and hot spot pattern change, the conventional type of cooling can increase this distortional stress, and, because the inhomogeneous impact of current causes the mechanical oscillation of YAG rod, cause the disturbance of resonant cavity zlasing mode and loss to increase, cause laser output power decline and degrade beam quality and beam-pointing bad stability etc.
The thermal deformation causing in order to control strong laser irradiation, water cooling is the active cooling method that superpower laser is conventional always, but, in traditional cooling means cooling procedure, the fluid of water inlet directly, at the radially one-sided YAG rod that acts on, causes mechanical shock to a certain extent to YAG rod, and YAG rod can produce additional deformation because of the pressure of cooling fluid, work long hours and even can cause the position skew of YAG rod, cause the unstable and degrade beam quality of laser output power and direction.
Summary of the invention
For the defect of prior art, the object of the present invention is to provide a kind of YAG laser, be intended to solve the fluid of water inlet in prior art directly at the radially one-sided YAG of acting on rod, can make the position skew of YAG rod cause the problem of the unstable and degrade beam quality of laser output power and direction thereby work long hours.
The invention provides a kind of YAG laser, comprise water inlet, cavity, cavity base, cooling collar, balancing slit and jet ring; Described cavity is positioned on described cavity base, has concentric and hard-wired inlet channel and cooling water channel in described cavity; Described water inlet is fixedly connected with the inlet channel in cavity; Described cooling collar is fixedly connected with the cooling water channel in cavity, and described cooling collar is interior for placing YAG crystal bar; Described jet ring is fixed on cooling collar by the installation site level at two ends, and with the airtight described jet ring two end supports point of sealing ring, the middle overhanging portion of described jet ring and the inner lead wall of described cooling water channel form described balancing slit.
Further, the cylindrical structure that described jet ring is hollow, described cylindrical side have multiple paired and with the jet orifice of circumference warp symmetry.
Further, described jet orifice be shaped as circle, rectangle or slit-shaped.
In the present invention, cooling water flows into laser from water inlet; Through cooling water channel, water is injected to balancing slit; Balancing slit surrounding adopts airtight can the assurance like this of sealing ring all to act on jet ring outer wall from the hydraulic pressure of cooling water channel inflow balancing slit, when filling cooling water, balancing slit reaches after certain hydraulic pressure, hydraulic pressure stepless action is in jet ring, jet ring is fixed on cooling collar by the installation site level at two ends, and with the airtight two end supports point of sealing ring, due to the effect of hydraulic pressure, cooling water is by the equally distributed jet orifice of jet ring surrounding, form the stepless action of jet water column in YAG rod, thereby reach the cooling effect of jet; Uniformly cooling water note has guaranteed that the hydraulic pressure that YAG rod is subject in cooling procedure is even.
The present invention also provides a kind of cooling means that adopts above-mentioned YAG laser to carry out laser water-cooled, comprises the steps:
S1: cooling water is pumped into laser water inlet by cooling water tank, and reach balancing slit through cooling water channel;
S2: in the time reaching predetermined hydraulic pressure in described balancing slit, cooling water forms uniform jet water column by the jet orifice of jet ring;
S3: described jet water column acts on YAG crystal surrounding equably, and to realize jet cooling.
Further, the cylindrical structure that described jet ring is hollow, described cylindrical side have multiple paired and with the jet orifice of circumference warp symmetry.
Further, described jet orifice be shaped as circle, rectangle or slit-shaped.
The cooling means of laser water-cooled provided by the invention is compared with traditional cooling means, and advantage is just to have avoided starting up's moment, and the cooling water that cooling water tank pumps into impacts the unstable variation of the beam direction of bringing to the direct stress of YAG crystal.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view at the YAG laser water inlet place that provides of the embodiment of the present invention;
Fig. 2 is the structural representation of jet ring in the YAG laser that provides of first embodiment of the invention;
Fig. 3 is the structural representation of jet ring in the YAG laser that provides of second embodiment of the invention;
Fig. 4 is the realization flow figure of the cooling means of the laser water-cooled that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the structure of the YAG laser that the embodiment of the present invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows:
A kind of YAG laser comprises water inlet 1, cavity, cavity base 3, cooling collar 5, balancing slit 6 and jet ring 7; Cavity is positioned on cavity base 3, has concentric and hard-wired inlet channel and cooling water channel 2 in cavity; Water inlet 1 is fixedly connected with the inlet channel in cavity; Cooling collar 5 is fixedly connected with the cooling water channel 2 in cavity, and described cooling collar 5 is interior for placing YAG crystal bar; Described jet ring 7 is fixed on cooling collar 5 by the installation site level at two ends, and with the airtight described jet ring 7 two end supports points of sealing ring, the middle overhanging portion of described jet ring 7 and the inner lead wall of described cooling water channel form described balancing slit 6.Wherein, the cylindrical structure that jet ring 7 is hollow, described cylindrical side have multiple paired and with the jet orifice of circumference warp symmetry.Jet orifice be shaped as circle, rectangle or slit-shaped.
4 is YAG crystal bar installation site, water inlet 1 is on cavity, to be connected cavity inner lead by fastened by screw, in order to prevent that junction from leaking, between adopted sealing ring airtight, in water inlet 1 water channel and cavity, cooling water channel 2 installation sites are to install with one heart, and the cooling water channel 2 in cavity and jet ring 7 and balancing slit 6 are all arranged on cavity base 3.Water channel in cavity base 3 is T font, and jet ring 7 is arranged on the infall of T word.Water channel on vertical is inlet channel, cross channel is exactly the water channel for cooling YAG crystal and installation crystal, jet ring 7 is arranged on cross channel, on vertical direction just to inlet channel, because the moulding of jet ring 7 is illustrated in figure 2 two ends arch brace, mid portion is unsettled, and two ends are fixed on cross channel and are adopted sealing ring airtight when mounted, and so in the middle of jet ring 7, overhanging portions are just and inner lead wall formation balancing slit 6.When cooling water flow impact jet flow ring 7, first to will in balancing slit 6, be full of, then just remove to spray YAG crystal by jet orifice.
The structure of jet ring 7 is mainly divided two large divisions: one is the structure that profile is similar to I shape, be mainly for after fixing can and waterway wall between form balancing slit, make hydraulic pressure consistent at whole jet ring surface, reach the effect of all pressing; Another important structure is exactly the jet orifice on jet ring surface, jet orifice different, can be that circle can be also rectangle or even narrow and small finedraw, the profile of jet orifice can be gone change according to designer's demand, but having an important principle is exactly to want symmetrical, jet orifice must be a pair of and with respect to circumference warp symmetry.Only in this way guarantee jet water column is symmetrical to the hydraulic pressure impact of YAG crystal, and hydraulic pressure can be cancelled each other, and does not have the hydraulic pressure in one direction that the direction of YAG crystal is fluctuateed.
Jet orifice on jet ring 7 outer surface circumference also can design according to different design requirements, and the shape of jet orifice can be that circular hole can be also other shapes such as tiny rectangle.Fig. 2 shows the jet orifice of circle hole shape, and Fig. 3 shows the jet orifice of clearance type.
In embodiments of the present invention, start-up of cooling system when the normal work of laser, water tank pumps into laser cooling water, and cooling water flows into laser from water inlet 1, through cooling water channel 2, water is injected to balancing slit 6, balancing slit 6 surroundings adopt airtight can the assurance like this of sealing ring all to act on jet ring 7 outer walls from the hydraulic pressure of cooling water channel inflow balancing slit 6, when filling cooling water, balancing slit 6 reaches after certain hydraulic pressure, hydraulic pressure stepless action is in jet ring 7, jet ring 7 is fixed on cooling collar 5 by the installation site level at two ends, and with the airtight two end supports point of sealing ring, due to the effect of hydraulic pressure, cooling water is by the equally distributed jet orifice 8 of jet ring 7 surrounding, form the stepless action of jet water column in YAG rod, 4 position is the installation site of YAG crystal bar, thereby reach the cooling effect of jet, uniformly cooling water note has guaranteed that the hydraulic pressure that YAG rod is subject in cooling procedure is even.
The YAG laser that the embodiment of the present invention provides utilizes jet current principle to make cooling fluid acting on YAG rod symmetrically, change flow field structure, thereby farthest reduce the radial compression applied that cooling fluid produces YAG rod, improve cooling effectiveness, improve laser power stability.
Fig. 4 shows the realization flow of the cooling means of laser water-cooled, specifically comprises the steps:
S1: cooling water is pumped into laser water inlet by cooling water tank, and reach balancing slit through cooling water channel;
S2: in the time reaching predetermined hydraulic pressure in balancing slit, cooling water forms uniform jet water column by the jet orifice of jet ring;
S3: jet water column acts on YAG crystal surrounding equably, and to realize jet cooling.
In embodiments of the present invention, jet ring 7 is enclosed within the outer position near water inlet of YAG crystal bar in pump cavity, first the current that water circulation starts rear water inlet 1 inject balancing slit 6, the hydraulic pressure that makes to encircle outer surrounding by balancing slit 6 is consistent, more cooling to spraying water equably on YAG rod radial circumference by the jet orifice 8 of specific arrangement on jet ring 7.Aperture on jet ring 7 is symmetrical diametrically, the pressure of having cancelled each other and due to water column, YAG rod having been caused.So neither can weaken cooling effect, also can not cause YAG rod footpath compression shock upwards, thereby make the stable light beam quality, reliable of whole laser.
As one embodiment of the present of invention, jet cooling method is mainly to realize by jet ring, in different applied environments, the shape of jet ring is also to change according to different application, on market, the YAG crystal shape of common YAG laser the inside is mainly divided into cylindrical and cuboid, when for columniform crystal, the interior installed surface of jet ring is circumference, be corresponding cuboid for installed surface in the crystal of cuboid formula, the size that concrete size can have more YAG crystal is adjusted.
The cooling means of the laser water-cooled that the embodiment of the present invention provides is compared with traditional cooling means, advantage is just to have avoided starting up's moment, and the cooling water that cooling water tank pumps into impacts the unstable variation of the beam direction of bringing to the direct stress of YAG crystal.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. a YAG laser, is characterized in that, comprises water inlet, cavity, cavity base, cooling collar, balancing slit and jet ring;
Described cavity is positioned on described cavity base, has concentric and hard-wired inlet channel and cooling water channel in described cavity; Described water inlet is fixedly connected with the inlet channel in cavity; Described cooling collar is fixedly connected with the cooling water channel in cavity, and described cooling collar is interior for placing YAG crystal bar; Described jet ring is fixed on cooling collar by the installation site level at two ends, and with the airtight described jet ring two end supports point of sealing ring, the middle overhanging portion of described jet ring and the inner lead wall of described cooling water channel form described balancing slit; The cylindrical structure that described jet ring is hollow, described cylindrical side have multiple paired and with the jet orifice of circumference warp symmetry.
2. YAG laser as claimed in claim 1, is characterized in that, described jet orifice be shaped as circle, rectangle or slit-shaped.
3. adopt YAG laser described in claim 1-2 any one to carry out a cooling means for laser water-cooled, comprise the steps:
S1: cooling water is pumped into laser water inlet by cooling water tank, and reach balancing slit through cooling water channel;
S2: in the time reaching predetermined hydraulic pressure in described balancing slit, cooling water forms uniform jet water column by the jet orifice of jet ring; The cylindrical structure that described jet ring is hollow, described cylindrical side have multiple paired and with the jet orifice of circumference warp symmetry;
S3: described jet water column acts on YAG crystal surrounding equably, and to realize jet cooling.
4. cooling means as claimed in claim 3, is characterized in that, described jet orifice be shaped as circle, rectangle or slit-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210384891.6A CN102916326B (en) | 2012-10-10 | 2012-10-10 | YAG laser and water-cooling method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210384891.6A CN102916326B (en) | 2012-10-10 | 2012-10-10 | YAG laser and water-cooling method thereof |
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| Publication Number | Publication Date |
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| CN102916326A CN102916326A (en) | 2013-02-06 |
| CN102916326B true CN102916326B (en) | 2014-06-18 |
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| CN107666106A (en) * | 2017-10-18 | 2018-02-06 | 哈尔滨工业大学 | A kind of 2 microns of Solid State Laser generating means of hectowatt grade |
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| DE10297656T5 (en) * | 2002-02-15 | 2005-02-17 | Mitsubishi Denki K.K. | Solid state laser device of the rod type |
| CN201327946Y (en) * | 2008-12-18 | 2009-10-14 | 深圳市大族激光科技股份有限公司 | Water cooling device |
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