CN107182268B - The spatial filtering method of high power fiber laser - Google Patents
The spatial filtering method of high power fiber laserInfo
- Publication number
- CN107182268B CN107182268B CN200910125403.8A CN200910125403A CN107182268B CN 107182268 B CN107182268 B CN 107182268B CN 200910125403 A CN200910125403 A CN 200910125403A CN 107182268 B CN107182268 B CN 107182268B
- Authority
- CN
- China
- Prior art keywords
- laser
- pin
- hole filter
- condenser lens
- ing component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 57
- 239000000835 fiber Substances 0.000 title claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 24
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 230000003287 optical Effects 0.000 claims abstract description 5
- 230000001808 coupling Effects 0.000 claims description 8
- 238000010168 coupling process Methods 0.000 claims description 8
- 238000005859 coupling reaction Methods 0.000 claims description 8
- 240000008574 Capsicum frutescens Species 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000005755 formation reaction Methods 0.000 claims 1
- 239000003365 glass fiber Substances 0.000 abstract description 18
- 239000011241 protective layer Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- 206010056871 Device failure Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention provides a kind of spatial filtering method of high power fiber laser, it locates to place a pin-hole filter-ing component with some micro- cooling ducts before the condenser lens focal plane of laser pumping optically coupled system, and the primary optical axis of condenser lens passes through the filtering aperture on pin-hole filter-ing component；Micro- cooling duct on the pin-hole filter-ing component is linked together with laser fiber clamping cooling system by cooling pipe.The present invention forms spatial filter by the condenser lens of pin-hole filter-ing component and laser coupled system, and space filtering is carried out to pump light, prevents pump light irradiation optical fiber end face and protective layer that the angle of divergence is larger, produces used heat, causes doped fiber to damage.
Description
Technical field
The present invention relates to the space filtering technology of laser, and in particular to a kind of high power fiber laser
Spatial filtering method.
Background technology
Laser technology obtains extensive use in national economy, such as laser be largely used to medical treatment,
Communication, printing and electronics industry etc..Superlaser can be used for the cutting, drilling, welding of multiple material
And surface treatment.Laser has militarily had many applications so far, and laser will as antipersonnel weapon
Enough power and energy are asked, this laser power density for requiring to reach target and energy density will be sufficient
Enough height, are referred to as high energy laser weapon.
Fiber laser technology is the technology that laser field develops forefront in the world.Optical fiber laser is profit
With the optical fiber of rare earth doped element as gain media, then form by resonator appropriate feedback mechanism,
And then constitute optical fiber laser.Pump light typically uses spatial coupling in high power fiber laser,
Due to there are the different angles of divergence, meeting diverse location on the focal plane of condenser lens in the pump light of pumping source output
Focus on.Optical fiber used in optical fiber laser is general all relatively thin, and the pump light that diverse location is focused on is possibly can not be complete
Portion is incided in optical fiber, causes pump power loss and protective layer damage；Even if inciding the pump of end face
Light may also produce used heat, this part is given up due to that can not be doped Ions Absorption more than fiber numerical aperture
Heat and the pump light not irradiated on end face produce used heat collective effect, optical fiber is made in high power laser
Damaged under due to local abrupt temperature rise.
Spatial filter is typically used to tackle the problem a few days ago, its structure is described as follows, first with one
Condenser lens is focused the light into, and aperture is placed on focal plane and selects the less light of the angle of divergence, then is passed through
Another condenser lens collimates the light into output.But this method be applied to high power fiber laser in when,
Can destroy the compactedness of optical fiber laser, increase the complexity of coupling pumping light, and used heat run up to it is small
Around the diaphragm of hole, device failure is also easily caused.
The content of the invention
It is an object of the invention to provide it is a kind of it is compact effectively, to pump light carry out space filtering it is high-power
Optical fiber laser spatial filtering method.
Realize the technical scheme of the object of the invention：A kind of spatial filtering method of high power fiber laser,
It is chilly with some that it locates placement one before the condenser lens focal plane of laser pumping optically coupled system
But the pin-hole filter-ing component of passage, the primary optical axis of condenser lens is through the filtering aperture on pin-hole filter-ing component；
Micro- cooling duct on the pin-hole filter-ing component is connected with laser fiber clamping cooling system by cooling pipe
It is connected together；Space is formed by the condenser lens of pin-hole filter-ing component and laser pumping optically coupled system
Wave filter, space filtering is carried out to pump light.
A kind of spatial filtering method of high power fiber laser as described above, the pin-hole filter-ing described in it
Component is placed on 2~5mm before the condenser lens focal plane of laser pumping optically coupled system.
A kind of spatial filtering method of high power fiber laser as described above, the pin-hole filter-ing described in it
With 2~4 micro- cooling ducts on component.
A kind of spatial filtering method of high power fiber laser as described above, the pin-hole filter-ing described in it
Hole diameter is filtered on component in 1~5mm.
Effect of the invention is that：Focusing of the invention by pin-hole filter-ing component and laser coupled system
Lens forming spatial filter, space filtering is carried out to pump light, prevents the larger pump light of the angle of divergence from shining
Fiber end face and protective layer are penetrated, used heat is produced, causes doped fiber to damage.What the spatial filter was used
Condenser lens and coupling pump light system are shared, pin-hole filter-ing component and laser fiber clamping cooling system
Together with, the complexity of system and coupling regulation is reduced, the compact of high power fiber laser is improved
Property, it is allowed to the need for being more easy to meet Military Application.
Brief description of the drawings
Fig. 1 is the spatial filtering method schematic diagram of high power fiber laser of the present invention；
Fig. 2 is spatial filter structural representation of the present invention；
Fig. 3 is pin-hole filter-ing modular construction schematic diagram；
In figure：1. optical fiber cools down clamper；2. fiber clamp；3. doubly clad optical fiber；4. cooling pipe；
5. pin-hole filter-ing component；6. condenser lens；7. filter aperture；8. micro- cooling duct.
Embodiment
The space of high power fiber laser of the present invention is filtered with specific embodiment below in conjunction with the accompanying drawings
Wave method is further described.
The focusing of laser fiber clamping cooling system and laser pumping optically coupled system is saturating in the present embodiment
Mirror is prior art.In laser fiber clamping cooling system, doubly clad optical fiber 3 is placed on optical fiber
In fixture 2, fiber clamp 2 is fixed on optical fiber cooling clamper 1.
As depicted in figs. 1 and 2, the spatial filtering method of high power fiber laser of the present invention,
Placement one is micro- with 2 at 3mm before the focal plane of condenser lens 6 of laser pumping optically coupled system
The pin-hole filter-ing component 5 of cooling duct 8, the primary optical axis of condenser lens 6 is passed through on pin-hole filter-ing component 5
One filtering aperture 7, filtering the diameter of aperture 7 in 3mm.Chilly on pin-hole filter-ing component 5 is but led to
Road 8 is linked together with cooling water channel in optical fiber cooling clamper 1 by cooling pipe 4.
By pin-hole filter-ing component 5 and the shape of the condenser lens of laser pumping optically coupled system 6 in the present invention
Into spatial filter, space filtering is carried out to pump light.It is specific as follows：
Condenser lens 6：Shared with coupling pump light system, designing the parameters such as its focal length makes most of pumping
The focal beam spot of light is less than fibre diameter, and numerical aperture meets fiber coupling requirement, and big angle of divergence pump
Pu light can be stopped in focal plane by pin-hole filter-ing component 5.
Pin-hole filter-ing component 5：It is positioned over before the focal plane of condenser lens 6 at 2~5mm, uses microchannel
Refrigeration (can be with 2~4 micro- cooling ducts), and laser fiber clamping cooling system share water route.
The material of pin-hole filter-ing component 5 need to have high thermal conductivity, for example, be made of copper.Pin-hole filter-ing component 5
On the diameter of filtering aperture 7 in 1~5mm.Fraction of laser light is blocked at small filter, and luminous energy turns
The thermal energy conduction cooling changed into, makes fiber end face temperature be not higher than 195 DEG C, to eliminate or reduce optical fiber end
Face coking phenomenon, it is ensured that system coupling efficiency.
Laser of the present invention can be used for each industrial circle, realize finer Product processing (such as
Automobile Welding, retrofit, laser marking), be conducive to improving product quality, it is possible to greatly save original
The consumption of material.Using spatial filter of the present invention, fiber end face temperature is controlled 195 all the time
Below DEG C, damage of the used heat to fiber end face and protective layer is effectively prevent, makes high power fiber laser
The product development high temperature proportion of goods damageds are substantially reduced, by the coupled transfer quality of each model laser of raising and surely
It is qualitative, while the compactedness of optical fiber laser is improved, so that the development week that each model laser will be shortened
Phase.
Claims (3)
1. a kind of spatial filtering method of high power fiber laser, it is characterised in that：This method is in laser
Place places one and chilly but led to some before condenser lens (6) focal plane of device coupling pump light system
The pin-hole filter-ing component (5) in road (8), the primary optical axis of condenser lens (6) passes through pin-hole filter-ing component (5)
On filtering aperture (7)；Micro- cooling duct (8) and laser optical on the pin-hole filter-ing component (5)
Fibre clamping cooling system is linked together by cooling pipe (4)；By pin-hole filter-ing component (5) and
Condenser lens (6) the formation spatial filter of laser pumping optically coupled system, space is carried out to pump light
Filtering；Described pin-hole filter-ing component (5) is placed on the condenser lens (6) of laser pumping optically coupled system
2~5mm before focal plane.
2. a kind of spatial filtering method of high power fiber laser according to claim 1, it is special
Levy and be：With 2~4 micro- cooling ducts (8) on described pin-hole filter-ing component (5).
3. a kind of spatial filtering method of high power fiber laser according to claim 1, it is special
Levy and be：Aperture (7) a diameter of 1~5mm is filtered on described pin-hole filter-ing component (5).
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107182268B true CN107182268B (en) | 2013-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR03 | Grant of secret patent right | ||
| DC01 | Secret patent status has been lifted | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20181230 |