CN208157847U - A kind of integrated compact type laser crystal and impulse modulation cooling device - Google Patents
A kind of integrated compact type laser crystal and impulse modulation cooling device Download PDFInfo
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- CN208157847U CN208157847U CN201820730100.3U CN201820730100U CN208157847U CN 208157847 U CN208157847 U CN 208157847U CN 201820730100 U CN201820730100 U CN 201820730100U CN 208157847 U CN208157847 U CN 208157847U
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- impulse modulation
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Abstract
The utility model discloses a kind of integrated compact type laser crystal and impulse modulation cooling device, which may include cooling base, and U-shaped coolant liquid circulation duct is provided in the cooling base；The U-shaped coolant liquid circulation duct includes inlet and liquid outlet；Impulse modulation device assembly, the impulse modulation device assembly include impulse modulation device and the optical crystal inside the impulse modulation device.Laser gain crystal and pulse-modulator are installed on the same cooling bottom plate by the device, and simple "U" shaped liquid cooling loop is used inside cooling bottom plate, reduce coolant liquid resistance, and then also reduce the requirement to coolant pressure and flow.Achieve the purpose that laser gain crystal and the assembly of pulse-modulator densification and modularized design simultaneously, is conducive to the entire diminution of pulse modulated solid state laser system bulk and the mitigation of weight.
Description
Technical field
The utility model relates to laser equipment technical fields, more particularly to a kind of integrated compact type laser crystal and arteries and veins
Modulated cooling device.
Background technique
With laser technology deepening continuously and extend in civilian and military field, various types of lasers processing,
Multinomial technological innovation is caused in numerous industries such as cutting, mark, radar, imaging and photoelectronic warfare, also brings huge warp
Ji value.In some practical applications, minimize, the solid state laser simple, easy for installation that freezes is more and more favored, and
The laser diode of the mature fiber coupling output of business at present is to realize that the end-pumping solid state laser of this compact is established
Technical foundation.
A large amount of waste heat can be generated in the gain crystal of solid state laser as pump light in laser diode, these are useless
If heat is discharged not in time, it will affect the performance of solid state laser, even result in the damage of laser gain crystal.In general, with
The waste heat of the increase of laser power, laser gain crystal is consequently increased, and the requirement radiated to it also increases accordingly.Relative to
To the cooling system of laser gain crystal direct water-cooling, conduction-type cooling, which has, to be not easy to cause optical distortion, has evaded leakage wind
Outstanding advantages of danger, cooling liquid flowing channel design facilitate answers extensively in optical fiber laser, slab laser and blocky laser
With.In order to improve the peak power density of laser, impulse modulation device is added in resonator, becomes laser from continuous output
For pulse output.Acousto-optic Q-switching is a kind of common Laser pulse modulator device, it working condition generate waste heat be also required to and
When take out of.In such pulse laser, laser gain crystal and impulse modulation device are needed while being radiated, thus laser
The design of internal coolant flow channel becomes complicated, it is difficult to realize miniaturization, densification.
Utility model content
The utility model provides a kind of integrated compact type laser crystal and impulse modulation cooling device.
The utility model provides following scheme：
A kind of integrated compact type laser crystal and impulse modulation cooling device, including：
Cooling base is provided with U-shaped coolant liquid circulation duct in the cooling base；The U-shaped coolant liquid circulation duct
Including inlet and liquid outlet；
Impulse modulation device assembly, the impulse modulation device assembly include impulse modulation device and be located at the impulse modulation
The optical crystal of device inside；The impulse modulation device is fixedly linked with the cooling base top；
Laser gain crystal, the laser gain crystal are fixedly linked with the cooling base top.
Preferably：The cooling base is made using aluminium or copper material.
Preferably：The first indium foil layer is provided between the impulse modulation device and the cooling base.
Preferably：The impulse modulation device be operation wavelength be 1064nm acousto-optic Q-switching, operation wavelength be~1.3 μ
The acousto-optic Q-switching of m, the acousto-optic Q-switching that operation wavelength is~1.9 μm, the acousto-optic Q-switching that operation wavelength is~2.1 μm, operating wave
Any one in a length of~2.7 μm of acousto-optic Q-switching.
Preferably：The laser gain crystal surrounding, which is covered with, is enclosed with the second indium foil layer, the second indium foil layer with it is described
Thermal grease layer is provided between cooling base.
Preferably：The laser gain crystal is using multistage key and form crystal.
Preferably：The laser gain crystal be Nd doping cuboid bulk crystals, mix Tm cuboid bulk crystals,
It mixes the cuboid bulk crystals of Ho, mix any one in the cuboid bulk crystals of Er.
Preferably：The impulse modulation device assembly is at a distance from the laser gain crystal for according to the laser of resonant cavity type
The lumen type of device is determined.
According to specific embodiment provided by the utility model, the utility model discloses following technical effects：
By the utility model, a kind of integrated compact type laser crystal and impulse modulation cooling device may be implemented,
Under a kind of implementation, which may include cooling base, and U-shaped coolant liquid runner pipe is provided in the cooling base
Road；The U-shaped coolant liquid circulation duct includes inlet and liquid outlet；Impulse modulation device assembly, the pulse-modulator group
Part includes impulse modulation device and the optical crystal inside the impulse modulation device；The impulse modulation device and institute
Cooling base top is stated to be fixedly linked；Laser gain crystal, the laser gain crystal and cooling base top stationary phase
Even.The integral type cooling device uses heat loss through conduction scheme, laser gain crystal and pulse-modulator is installed on same cold
But on bottom plate, and simple "U" shaped liquid cooling loop is used inside cooling bottom plate, reduce coolant liquid resistance, and then also reduce
Requirement to coolant pressure and flow.Laser gain crystal and the assembly of pulse-modulator densification and modularization are reached simultaneously
The purpose of design is conducive to the entire diminution of pulse modulated solid state laser system bulk and the mitigation of weight.
Certainly, any product for implementing the utility model does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is a kind of integrated compact type laser crystal and impulse modulation cooling device provided by the embodiment of the utility model
First structure diagram；
Fig. 2 is a kind of integrated compact type laser crystal and impulse modulation cooling device provided by the embodiment of the utility model
The second structural schematic diagram.
In figure：Cooling base 1, U-shaped coolant liquid circulation duct 2, inlet 201, liquid outlet 202, impulse modulation device 3,
Optical crystal 4, laser gain crystal 5, the reflecting mirror 6 of resonant cavity of solid state laser, resonant cavity of solid state laser outgoing mirror 7,
The laser 9 that pump light 8, the solid state laser of coupled system call interception spot size export.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art's every other embodiment obtained, all belongs to
In the range of the utility model protection.
It is a kind of integrated compact type laser crystal and pulse tune provided by the embodiment of the utility model referring to Fig. 1, Fig. 2
Cooler part is provided with U-shaped cooling liquid stream as shown in Figure 1, the cooling device includes cooling base 1 in the cooling base 1
Thread a pipe 2；The U-shaped coolant liquid circulation duct 2 includes inlet 201 and liquid outlet 202；
Impulse modulation device assembly, the impulse modulation device assembly include impulse modulation device 3 and be located at the pulse tune
Optical crystal 4 inside device 3 processed；The impulse modulation device 3 is fixedly linked with 1 top of cooling base；
Laser gain crystal 5, the laser gain crystal 5 are fixedly linked with 1 top of cooling base.
Further, the cooling base 1 is made using aluminium or copper material.The impulse modulation device 3 with it is described
The first indium foil layer is provided between cooling base 1.The impulse modulation device be operation wavelength be 1064nm acousto-optic Q-switching,
Acousto-optic Q-switching that operation wavelength is~1.3 μm, the acousto-optic Q-switching that operation wavelength is~1.9 μm, operation wavelength are~2.1 μm
Acousto-optic Q-switching, operation wavelength are any one in~2.7 μm of acousto-optic Q-switching.5 surrounding of laser gain crystal is covered with
It is enclosed with the second indium foil layer, is provided with thermal grease layer between the second indium foil layer and the cooling base.The laser increases
Beneficial crystal is using multistage key and form crystal.The laser gain crystal 5 is the cuboid bulk crystals of Nd doping, mixes Tm's
Cuboid bulk crystals, the cuboid bulk crystals for mixing Ho mix any one in the cuboid bulk crystals of Er.The pulse
Modulator component is determined at a distance from the laser gain crystal by the lumen type of the laser according to resonant cavity type.
Four side wraps, one layer of thin indium foil of gain crystal 5, plays reduction and cooling base thermal-conduction resistance, quickly passes
The purpose of heat.Thermal expansion effects of the buffered crystal in pump light load are played simultaneously, are reduced crystal caused by heat stress and are damaged
Wound.Gain crystal uses multistage key and form, and crystal is made to carry out uniform pickup to pump light in optical direction, reduces crystal light passing
The temperature gradient in direction keeps the uniformity of gain crystal temperature effect, reduces the adverse effect of crystal thermal effect.Pulse-modulator is adopted
With the conduction type of cooling mature in the market, adjusting with equipped inclination and the pitching that can carry out angle of cooling base, from
And play the optical axis of adjustment pulse-modulator and the consistent purpose of optical axis of gain crystal.Cooling base is cold using "U" shaped
But runner design makes coolant liquid pass twice through gain crystal and pulse-modulator, binary channels cooling can more fully with
The waste heat of two heat generating devices, and improve its temperature uniformity.The coolant flow channel of "U" shaped for the pipeline at right angle,
It can reduce the water resistance of cooling base, to reduce the requirement to coolant pressure and flow.This integrated compact type laser
Crystal and impulse modulation cooling device may be directly applied to the laser of various resonant cavity types as a modular component
In.The distance between laser crystal and pulse-modulator can be adjusted according to cavity effects, different to be suitable for laser diode
Pump spot size.
In order to further illustrate scheme provided by the present application, it is illustrated below by several specific embodiments：
Embodiment 1：Laser gain crystal is using the cuboid bulk crystals of Nd doping (as a typical special case：Body
Product is 3mm × 3mm × 20mm key and Nd:YVO4 crystal), the indium foil of surrounding one layer of 0.2mm thickness of smooth package, then uniform
Coat one layer of heat-conducting silicone grease, be placed on the pedestal of cooling device.The method of clamping of laser gain crystal is to fix up and down, on
Cover board comes into full contact with pedestal, to keep the heat-sinking capability and temperature uniformity of crystal upper and lower side.Impulse modulation device is to pass
The volume of the 1064nm acousto-optic Q-switching of conduction cooling but, typical products is 35mm × 46mm × 25mm (height), and acousto-optic Q-switching bottom is put
The indium foil of 35mm × 46mm × 0.5mm (thickness) is set, thermal-conduction resistance is reduced.By adjusting the fixed angle of fixed acousto-optic Q-switching, make
Optical crystal therein matches with optical axis determined by laser gain crystal.Acousto-optic Q-switching is opposite with laser gain crystal
Position can specifically be adjusted according to the Resonator design of solid state laser.Cooling device uses the preferable aluminum material of thermal coefficient
Material, it has many advantages, such as that light-weight, processing technology is mature simultaneously.In order to reach better heat dissipation effect, thermally conductive system can choose
The higher copper material of number, but its weight will will increase.The water (flow) direction of the inlet and outlet of liquid cooling loop can be interchanged, practical application
In can be designed to the forms such as fast joint, the flow and temperature of coolant liquid can be according to the operating temperatures and Nd crystal of acousto-optic Q-switching
Cooling requirements be adjusted.Typically, the temperature of coolant liquid more low heat emission effect is better, but also needs to consider too low temperature
Spend the condensation trouble under ambient humidity.
In the concrete application of present embodiment, the diode laser of 808nm is coupled by the pump light of optical fiber output
After system call interception spot size, the center of Nd crystal is input to from right side, Nd crystal fully absorbs diode laser.In Nd crystalline substance
Reflecting mirror and outgoing mirror are placed before body and behind acousto-optic Q-switching respectively, it is humorous to be formed linear solid state laser
Shake device, as shown in Figure 2.Increased part in figure, 6 be the reflecting mirror of resonant cavity of solid state laser, and 7 be resonant cavity of solid state laser
Outgoing mirror, 8 be coupled system call interception spot size pump light, 9 for solid state laser output laser.Solid state laser
The hysteroscope 6 and 7 of resonant cavity is fixed on cooling base 1.
Coolant temperature is 20 DEG C, flow 1L/min, can be realized the 1064nm pulse laser output of 30W, continues steady
Surely it works 60 minutes or more, sufficiently demonstrates the validity of the integrated compact type laser crystal and impulse modulation cooler.Benefit
With integrated compact type laser crystal of the present invention and impulse modulation cooling device, the volume of the pulsed solid stale laser is only
For 35mm × 46mm × 25mm (height).It is subsequent 1064nm laser to short wavelength's (such as frequency multiplication benefit) and long wavelength (such as light
Parametric oscillator) nonlinear frequency transformation provide technical support.
Embodiment 2：Illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, the present embodiment is with difference described in embodiment 1, makees
It is 880nm for the diode laser wavelength of pumping source.It is pumped using the laser diode of 880nm, is conducive to the suction of Nd crystal
The uniformity of receipts improves conversion quantum efficiency, reduces the yield of waste heat, the final temperature uniformity for improving Nd crystals,
Increase the pump power that Nd crystal can be born, extends the applicable model of integrated compact type laser crystal and impulse modulation cooling device
It encloses.
Embodiment 3：Illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, the present embodiment is with difference described in embodiment 1, selects
Select~1.3 μm of acousto-optic Q-switching.The reflecting mirror and outgoing mirror of solid state laser are coated with high-reflecting film for~1.3 μm and part is anti-
Penetrating film, (in order to inhibit the lasing of 1.064 μm of laser, two hysteroscopes are also coated with 1.064 μm of anti-reflection film, to increase its intracavitary damage
Consumption), make solid state laser realize pulse~output of 1.3 μm of laser.
Embodiment 4：Illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, the present embodiment is with difference described in embodiment 1, swashs
Gain of light crystal selects to mix the bulk crystals of Tm, and pumping source selects wavelength for the laser diode of 793nm, the work of acousto-optic Q-switching
Making wavelength is~1.9 μm, the solid state laser thus designed by realize pulse~1.9 μm of laser export.
Embodiment 5：Illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, the present embodiment is with difference described in embodiment 1, swashs
Gain of light crystal selects to mix the bulk crystals of Ho, and pumping source selects wavelength for~1.9 μm of optical fiber laser, acousto-optic Q-switching
Operation wavelength is~2.1 μm, the solid state laser thus designed by realize pulse~2.1 μm of laser export.
Embodiment 6：Illustrate present embodiment in conjunction with Fig. 1 and Fig. 2, the present embodiment is with difference described in embodiment 1, swashs
Gain of light crystal selects to mix the bulk crystals of Er, and pumping source selects wavelength for the laser diode of 975nm, the work of acousto-optic Q-switching
Making wavelength is~2.7 μm, the solid state laser thus designed by realize pulse~2.7 μm of laser export.
The beneficial effect of this programme includes：
(1) in this application, this integrated compact type laser crystal and impulse modulation cooling device can be used as solid
The pedestal of laser, the optical elements such as optical mirror slip, coupled system and subsequent nonlinear frequency transformation system that may be present
It can be installed on the pedestal of cooler, to make the module of solid state laser as a whole, improve laser engineering
The reliability of change also reduces the complexity of laser, miniaturization and lightweight volume, in terms of design band
To facilitate.
(2) in this application, laser gain crystal and pulse-modulator have the function of separately adjustable, can be according to solid
The design of laser resonant cavity carries out pitching and tilt adjustments in terms of angle, can also carry out the relative distance in terms of position
Adjustment, have preferable flexibility and adaptability, reach best to reach laser output performance.
(3) in this application, using the laser gain crystal of key sum, and surrounding package indium foil and apply heat-conducting silicone grease can be with
Improve the temperature uniformity of gain crystals；Indium foil is placed between pulse-modulator and cooling base and applies heat-conducting silicone grease
The heat transfer that pulse-modulator can be improved absorbs, and avoid cooling water channel must using three-dimensional circuit, make cooling water channel from
Laser gain crystal and pulse-modulator surrounding pass through.The cooling water channel designed in the present invention avoids this three-dimensional circuit and makes
At water resistance it is larger, risk of leakage is larger the disadvantages of.
(4) in this application, provided integrated compact type laser crystal and impulse modulation cooling device have certain
Universality, be suitable for various laser gain crystal (such as doping Nd, Yb, Tm, Ho, Er etc.), be also applied for various diodes
Laser pumping source (such as 808nm, 880nm, 793nm, 975nm etc.), while being also applied for the solid state laser of various end-pumpings
Device (such as line chamber, refrative cavity, annular chamber, average chamber, flat-concave cavity etc.).
In short, integrated compact type laser crystal provided by the present application and impulse modulation cooling device, are for current arteries and veins
The solid state laser of modulated (is usually directed to gain crystal and pulse tune in the excessively complicated problem of cooling radiating flow passage design
Device processed is radiated respectively), and a kind of integrated compact type laser crystal and impulse modulation cooling device are provided.The integral type is cold
But device uses heat loss through conduction scheme, and laser gain crystal and pulse-modulator are installed on the same cooling bottom plate, and cold
But base plate interior uses simple "U" shaped liquid cooling loop, reduces coolant liquid resistance, so also reduce to coolant pressure and
The requirement of flow.Laser gain crystal and the assembly of pulse-modulator densification and modularized design are achieved the purpose that simultaneously, have had
Conducive to the entire diminution of pulse modulated solid state laser system bulk and the mitigation of weight.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the preferred embodiment of the utility model only, is not intended to limit the protection model of the utility model
It encloses.Any modification, equivalent substitution, improvement and etc. made within the spirit and principle of the present invention, are all contained in this reality
With in novel protection scope.
Claims (8)
1. a kind of integrated compact type laser crystal and impulse modulation cooling device, which is characterized in that including：
Cooling base is provided with U-shaped coolant liquid circulation duct in the cooling base；The U-shaped coolant liquid circulation duct includes
Inlet and liquid outlet；
Impulse modulation device assembly, the impulse modulation device assembly include impulse modulation device and be located at the impulse modulation device
Internal optical crystal；The impulse modulation device is fixedly linked with the cooling base top；
Laser gain crystal, the laser gain crystal are fixedly linked with the cooling base top.
2. integrated compact type laser crystal according to claim 1 and impulse modulation cooling device, which is characterized in that institute
Cooling base is stated to be made using aluminium or copper material.
3. integrated compact type laser crystal according to claim 1 and impulse modulation cooling device, which is characterized in that institute
It states and is provided with the first indium foil layer between impulse modulation device and the cooling base.
4. integrated compact type laser crystal according to claim 3 and impulse modulation cooling device, which is characterized in that institute
State impulse modulation device be operation wavelength be 1064nm acousto-optic Q-switching, operation wavelength be~1.3 μm acousto-optic Q-switching, work
Acousto-optic Q-switching that wavelength is~1.9 μm, the acousto-optic Q-switching that operation wavelength is~2.1 μm, the acousto-optic that operation wavelength is~2.7 μm
Any one in Q-switch.
5. integrated compact type laser crystal according to claim 1 and impulse modulation cooling device, which is characterized in that institute
It states laser gain crystal surrounding and is covered with and be enclosed with the second indium foil layer, be provided between the second indium foil layer and the cooling base
Thermal grease layer.
6. integrated compact type laser crystal according to claim 5 and impulse modulation cooling device, which is characterized in that institute
Stating laser gain crystal is using multistage key and form crystal.
7. integrated compact type laser crystal according to claim 6 and impulse modulation cooling device, which is characterized in that institute
State cuboid bulk crystals that laser gain crystal is Nd doping, the cuboid bulk crystals of mixing Tm, the cuboid for mixing Ho it is blocky
Crystal mixes any one in the cuboid bulk crystals of Er.
8. according to claim 1 to integrated compact type laser crystal described in 7 any one and impulse modulation cooling device,
It is characterized in that, the impulse modulation device assembly is at a distance from the laser gain crystal for according to the chamber of the laser of resonant cavity type
Type is determined.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820730100.3U CN208157847U (en) | 2018-05-16 | 2018-05-16 | A kind of integrated compact type laser crystal and impulse modulation cooling device |
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| CN201820730100.3U CN208157847U (en) | 2018-05-16 | 2018-05-16 | A kind of integrated compact type laser crystal and impulse modulation cooling device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11881676B2 (en) * | 2019-01-31 | 2024-01-23 | L3Harris Technologies, Inc. | End-pumped Q-switched laser |
-
2018
- 2018-05-16 CN CN201820730100.3U patent/CN208157847U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11881676B2 (en) * | 2019-01-31 | 2024-01-23 | L3Harris Technologies, Inc. | End-pumped Q-switched laser |
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