CN1658452A - Laser LED with single mode optical fibre coupling and spatial filter - Google Patents
Laser LED with single mode optical fibre coupling and spatial filter Download PDFInfo
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- CN1658452A CN1658452A CN 200510024174 CN200510024174A CN1658452A CN 1658452 A CN1658452 A CN 1658452A CN 200510024174 CN200510024174 CN 200510024174 CN 200510024174 A CN200510024174 A CN 200510024174A CN 1658452 A CN1658452 A CN 1658452A
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Abstract
A laser diode with monofilm fiber coupling and space filter. It uses the non-sphere collimation module with different shapes of the sagittal surface and meridian plane to collimate LD laser beam. The projection of the front surface of the collimation module on the sagittal surface is hyperbola to collimate LD fast axes laser beam and emendate the curl image plane to flat image plane, and eliminate the astigmation of the collimation beam; the projection of the back surface of the collimation module on the sagittal surface is a straight line. The projection of the front surface of the collimation module on the meridian plane is near semicircular, the projection of the back surface of the collimation module on the meridian plane has the curvature allocation of ellipse, and they collimate LD slow laser beam to reduce beam dispel and beam size, and cooperate with the collimation function of fast axes and make the collimation beam become the parallel and circular laser beam that eliminate the astigmation and image dispel. Then it slowly changes the focus of lens and completes the highly efficient coupling. The coupling efficiency of this invention is 50%--70%, the structure is tight and reasonable, the operation is convenient and is easily for industrialization.
Description
Technical field
The present invention relates to laser diode, particularly a kind of laser diode with monomode fiber coupling and spatial filter, be particularly related to high multimode laser diode than (output is≤8 watts continuously) monomode fiber coupling of (greater than 1, smaller or equal to 8) high power and space filtering with a tight waist.
Background technology
Laser diode (hereinafter to be referred as LD) is one of present most widely used opto-electronic device.It is applied to many fields, such as: disc accessing, laser printing, CD-ROM driving, mask aligner, bar code scan, optical fiber communication, laser space communication and field such as medical.In these fields, all require light beam to have high power high luminance and closely parallel, subcircular, low beam spreading, aberrationless, the equally distributed characteristic of intensity.Using in order to be fit to these, is the optics input of collimation, imaging or the focusing of rear optical system a kind of good solution of can yet be regarded as through the light beam of monomode fiber space filtering output.Optical output power at the single mode LD of present commercialization is low excessively, only limits to the hundreds of milliwatt, and adopts high multimode LD than (＞2) high power (output is≤4 watts continuously) with a tight waist especially to be fit to this application.The efficient coupling energy of it and monomode fiber improves the average power density of power output greatly, all exceeds more than 10 times than typical high power neodymium-doped yttrium-aluminum garnet (Nd:YAG) laser multimode fiber coupling output.Therefore, high with a tight waist have application prospect than high power LD through the efficient coupling of the monomode fiber row space pattern filtering of going forward side by side.
The coupling of multimode LD and monomode fiber, distinct issues are that coupling efficiency is low.This is because the beam spreading difference of the fast and slow axis of this LD is big, the small value aperture (N of bundle spot serious asymmetric and quick shaft direction light beam and monomode fiber
AWhat=0.11) mismatch caused.Formerly technology is (referring to JOURNAL OFLIGHTWAVE TECHNOLOGY.VOL.19, NO.12, December 2001.P1910～1917) the microtrabeculae face lens that adopt wedge shape graded index fiber end face to make suitable radius abut against the coupled structure of monomode fiber front end.This correct-by-construction the mismatch of practising physiognomy, obtained the 980nm wavelength with a tight waistly than being 3 the LD and the coupling of monomode fiber, its maximal efficiency is 50%.
Summary of the invention
Not high in order to solve formerly in the technology coupling efficiency, and only be fit to proofread and correct the tuftlet waist than problems such as (≤3), the invention provides a kind of laser diode with monomode fiber coupling and spatial filter, it should have the high power laser light output of higher coupling efficiency and bigger waist beam ratio.
To achieve these goals, basic structure of the present invention is: girdle the waist than the laser beam of LD at the different aspheric surface collimating module collimation height of the face type of sagittal surface and meridian plane with one, the projection of the front surface of collimating module in sagittal surface is hyperbola, it is used for collimating the fast axle of LD laser beam, and bending with sizing practises physiognomy into hither plane and practises physiognomy, and eliminates the aberration of collimated light beam; The rear end surface of collimating module is projected as a straight line in sagittal surface.The projection approximation of the front surface of collimating module in meridian plane is semicircle, the projection of the rear surface of collimating module in meridian plane has oval curvature distribution, the laser beam of their collimation LD slow axis, dwindle beam spreading and bundle size, cooperate the collimating effect of fast axle, make collimated light beam become aberration, anastigmatic closely parallel, circular laser beam.Focus on monomode fiber by graded index (GRIN) GRIN Lens again, finish efficient coupling.
Concrete technical solution of the present invention is as follows:
A kind of laser diode with monomode fiber coupling and spatial filter, its formation comprises the base that has the shell electrode and coupling main brace spare, is equipped with semiconductor cooler successively on the central axis of the inner chamber of this coupling main brace spare and base, copper billet, heat sink copper billet, laser diode, coupling distance control piece, collimating module, GRIN Lens and optical fiber coupling head dispel the heat; Described laser diode, collimating module, the same optical axis of GRIN Lens and optical fiber coupling head, described collimating module is that the back non-spherical lens that face type that the face type by sagittal surface is different from the preceding non-spherical lens of meridian plane face type and sagittal surface is different from meridian plane face type constitutes, the preceding non-spherical lens of this collimating module and the projection of back non-spherical lens in sagittal surface are respectively hyperbola and straight line, and the projection in meridian plane is respectively semicircle and semiellipse curve, the input end face of this collimating module and output end face all are coated with the anti-reflection film to the emission wavelength of laser diode, the non-spherical lens of the input of this collimating module is over against the light-emitting area of described laser diode, the output of this collimating module is a non-spherical lens, over against described GRIN Lens.
Described heat radiation copper billet and heat sink copper billet fuse, porose respectively in a side of this heat radiation copper billet to put thermistor, a side has the light watch-dog on the light-emitting area of laser diode, the input end face of described collimating module is relative with the light-emitting area of laser diode by the coupling distance control piece, the groove that one semicircle is arranged on its central axis of the right surperficial upper edge of heat sink copper billet, described optical fiber coupling head place in this groove and by the fixing head of coupling and fixedly vest be fixed in the main brace spare that is coupled, at fixing vest, fill up inserts between the groove (16) on fixing head of coupling and the heat sink copper billet and constitute packed layer.
The light-emitting area of described laser diode is controlled by the coupling distance control piece to the coupling distance d between the collimating module input end face, and coupling distance d is controlled at d≤198 μ m.
Described GRIN Lens is a gradually changed refractive index, the long P of its joint
t=0.25, the output end face of this GRIN Lens promptly is the input end face of monomode fiber, and the both ends of the surface of this GRIN Lens all are coated with the anti-reflection film to the laser diode operation wavelength.
The center of the fixing head of described coupling is the optical fiber coupling head of optical fiber front end just.
Be with the tubule cover on the cylindrical of described optical fiber, on the cylindrical of this tubule cover, be with the metal pipe box, between the cylindrical of optical fiber and tubule cover and between tubule cover cylindrical and metal pipe box, the fixing seal layer is arranged all, the other end of this optical fiber stretches out outside the coupling main brace spare, end near this coupling main brace spare is with copper pipe on the optical fiber outer ring, between optical fiber cylindrical and copper pipe heat-shrink tube is arranged, the tail end of this optical fiber has the connector of band connector core.
The span of the angle of inclination beta of the optic fibre input end face of described optical fiber coupling head is 6 °＜β≤8 °.
Packed layer between the groove on described fixedly vest, the fixing head of coupling and the heat sink copper billet is that soldering adds epoxy glue layer and constitutes, between optical fiber cylindrical and tubule cover and the fixing seal layer that overlaps between cylindrical and the metal pipe box at tubule be that soldering adds the epoxy glue layer formation.
Described fixedly vest is that kovar is made
Described tubule cover is quartzy tubule or capillary glass tube.
Concrete structure with laser diode of monomode fiber coupling and spatial filter of the present invention comprises with base 2 that has shell electrode 1 and coupling main brace spare 3, be equipped with semiconductor cooler 4 on the base 2 in coupling main brace spare 3, on semiconductor cooler 4, be placed with the heat radiation copper billet 5 and the heat sink copper billet 6 that fuse.On heat radiation copper billet 5, be equipped with the hole 7 and the light watch-dog 11 of thermistor.Be equipped with the laser diode 8 that is centered close on base 2 and coupling main brace spare 3 central axis on the heat sink copper billet 6.Facing to the light-emitting area of LD8, be equipped with the collimating module 10 of central point at coupling main brace spare 3 central axis.Between collimating module 10 and optical fiber coupling head 13, be equipped with GRIN Lens 12.Between collimating module 10 input end faces and LD8 light-emitting area, be equipped with coupling distance control piece 9.The groove 16 that one semicircle is arranged on this central axis of the upper surface upper edge of heat sink copper billet 6 right half parts.Optical fiber coupling head 13 by place in the groove 16 fixing 20 of coupling and fixedly vest 14 be fixed on the heat sink copper billet 6.In order to fix better, between the groove 16 on fixing 20 of fixing vest 14, coupling and the heat sink copper billet 6, fill up inserts formation packed layer 15.The optical axis of above-mentioned LD8, collimating module 10, GRIN Lens 12 and optical fiber coupling head 13 is same optical axis.As shown in Figure 1.
Said collimating module 10 is that the back non-spherical lens 102 that face type that the face type by sagittal surface is different from the preceding non-spherical lens 101 of meridian plane face type and sagittal surface is different from meridian plane face type constitutes.As shown in Figure 3.The preceding non-spherical lens 101 of collimating module 10 and the projection of back non-spherical lens 102 in sagittal surface are as shown in Figure 4, corresponding hyperbola of difference and straight line, the span of wherein hyp real axis, the imaginary axis is respectively: 81 μ m≤A≤402 μ m, 85 μ m≤B≤427 μ m.The preceding non-spherical lens 101 of collimating module 10 and the projection of back non-spherical lens 102 in meridian plane are distinguished corresponding semicircle and semiellipse curve as shown in Figure 5.The radius of corresponding semicircle: 177 μ m≤R≤968 μ m, and the length range of the long and short axle of corresponding semiellipse: 691 μ m≤C2≤886 μ m, 503 μ m≤D2≤645 μ m.The input and output end face of collimating module 10 all is coated with the anti-reflection film to the LD8 emission wavelength.Facing to an end of LD8 light-emitting area, be input non-spherical lens 101, and output is a non-spherical lens 102 in the collimating module 10.
The operation wavelength λ of said LD8: 780nm～830nm, it is with a tight waist than (≤8), and output is≤4 watts continuously.Its light-emitting area is controlled at d≤198 μ m to the coupling distance d between collimating module 10 input end faces.This coupling distance d is controlled by the coupling distance control piece 9 between LD8 light-emitting area and collimating module 10 input end faces.
Said GRIN Lens 12 is gradually changed refractive indexes.Long 0.23＜the P of its joint
t≤ 0.25, operation wavelength λ: 780nm～830nm.The output end face of GRIN Lens 12 promptly is the input end face of monomode fiber.The two ends of GRIN Lens 12 all are coated with the anti-reflection film to the LD8 operation wavelength.
Under the center that said coupling is fixing 20 is optical fiber 23.Optical fiber 23 is standard molten silicon step-index single-mode fibers.Optical fiber 23 front end band optical fiber coupling heads 13.Be with tubule cover 18 on optical fiber 23 cylindricals.On the cylindrical of tubule cover 18, be with metal pipe box 17.Between the cylindrical of optical fiber 23 and tubule cover 18, and overlap between 18 cylindricals and the metal pipe box 17 at tubule fixing seal layer 19 is all arranged.The other end of optical fiber 23 reaches outside the base 2, and an end of close base 2 is with copper pipe 21 on optical fiber 23 outer rings, between optical fiber 23 cylindricals and copper pipe 21 heat-shrink tube 22 is arranged.The connector 24 that band connector core 25 is arranged on the tail end of the optical fiber 23 that reaches base 2 lateral surfaces.As shown in Figure 1 and Figure 2.
The angle of inclination beta of the optic fibre input end face of said optical fiber coupling input head 13 is 6 °＜β≤8 °.
Said fixedly vest 14, packed layer 15 is scolding tin and epoxy glue layer between the groove 16 on fixing 20 of coupling and the heat sink copper billet 6.
Said between optical fiber 23 cylindricals and tubule cover 18 and the fixing seal layer 19 that overlaps between 18 cylindricals and the metal pipe box 17 at tubule constitute by scolding tin and epoxy resin.
Said fixedly vest 14 is that kovar is made.
Said tubule cover 18 is quartzy tubule or capillary glass tube.
Said connector 24 is standard FC.
Require the size of the required refrigerator 4 of the reliable and stable work of coupling LD8 about the heat dissipation capacity of base 2 of the present invention.
About coupling main brace spare 3 of the present invention, be used for location, centre of support collimating module 10, groove 16 and GRIN Lens 12, adjust the optical axis unanimity by the laser beam of LD8.
About collimating module 10 of the present invention, structure as shown in Figure 3.Be integrated by the different non-spherical lens 101 and 102 of forward and backward surface structure.Preceding non-spherical lens 101 has optimized hyperbola curvature distribution in the projection of sagittal surface, and it collimates the fast axle (θ of LD8
⊥) beam spreading, and eliminate the LD8 laser beam aberration of axle soon, make the laser beam of sagitta of arc direction become collimated light beam; Preceding non-spherical lens 101 is at the projection approximation semicircle of meridian plane, and it suitably disperses the laser beam of LD8 slow-axis direction.Back non-spherical lens 102 has best elliptical curvature to distribute at meridian plane, and the disperse function of 101 pairs of meridian plane laser beams of non-spherical lens makes laser beam become the circular outgoing of near symmetrical before the associating; The projection of non-spherical lens in sagittal surface then is straight line, and it has guaranteed the parallel outgoing of light beam at this face.This collimating module of the present invention has compensated the fast axle of laser beam and the astigmatism of slow axis, thereby has collimated laser beam.
About gradual change autohemagglutination lens 12 of the present invention, both ends of the surface all are coated with anti-reflection film to the operation wavelength of LD8, and the eigen mode spot of its focal spot size and monomode fiber 23 is complementary, and focus point drops on the end of being close to output.
About fixing 20 of coupling of the present invention, fixing in order to be coupled, structure is as shown in Figure 2 made in fixing 20 of coupling, the coupling loss minimum, almost with unguyed the same during coupling before fixed, promptly the fixed structure of optical fiber 23 is not introduced coupling loss to the tail optical fiber Output optical power.
About optical fiber coupling input head 13 of the present invention, strict coaxial being fixed in the groove 16, its couple input face grinding and polishing becomes 6 °～8 ° inclination angles, to reduce from the loss of LD8 reflection of incident light, improves coupling efficiency.
About optical fiber 23 of the present invention, be standard molten silicon step-index single-mode fiber, it has the multiple action of coupling, transmission, spatial model filtering concurrently, has only to excite monomode fiber eigen mode (LP
01) light beam could be propagated, its can filtering noise, purification pattern after its filtering, will obtain desirable Gaussian beam in the connection core print 25 of fiber connector 24.
The present invention utilizes the ingenious property of collimating module 10 structures, the collection anaberration, anastigmatic acting on all over the body, make light beam behind the collimation at fast, slow axis all near the wavy attitude in ideal plane, and subcircular output; Also just because of it has such structure, technology has solved high technical barrier than (≤8) LD and monomode fiber coupling with a tight waist better thereby compare formerly.Its coupling efficiency: 50%＜η≤76% has improved power output.In addition, the present invention also is applicable to the coupling of little waist beam ratio high power single mode LD and monomode fiber, so application potential of the present invention is very big.
Built-in semiconductor cooler 4 of the present invention and light watch-dog 11 have functions such as refrigeration, control power, make that high power LD can reliable and stable work.The present invention has added standard connector 24 at the tail optical fiber end, is convenient to docking of the present invention and application system, and this has enlarged range of application of the present invention greatly.Compact conformation of the present invention is reasonable, and small portable, and big coupling operating distance (d≤198 μ m) is arranged is easy to operate during coupling, and the advantage of the industrialization of being easy to is arranged.
The present invention has the laser diode of monomode fiber coupling and spatial filter, because the spatial model filter action of monomode fiber makes that light beam is basic mode (PL
01) output, collimating module has special construction, the collection anaberration, anastigmatic acting on all over the body, make light beam behind the collimation at fast, slow axis all near the wavy attitude in ideal plane, and subcircular hot spot output, this is very favourable to improving the laser output beam characteristic, coupling efficiency: 50%～76%.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention.
Fig. 2 is that the present invention's fixing 20 cut open that be coupled shown structural representation.
Fig. 3 is the structural representation of collimating module 10 of the present invention.
Fig. 4 is the perspective view of collimating module 10 of the present invention in sagittal surface.
Fig. 5 is the perspective view of collimating module 10 of the present invention in meridian plane.
Embodiment
See also Fig. 1,2,3 earlier, as seen from the figure, the formation that the present invention has the laser diode of monomode fiber coupling and spatial filter comprises base 2 and the coupling main brace spare 3 that has shell electrode 1, is equipped with semiconductor cooler 4, heat radiation copper billet 5, heat sink copper billet 6, laser diode 8, coupling distance control piece 9, collimating module 10, GRIN Lens 12 and optical fiber coupling head 13 on the central axis of coupling main brace spare 3 inner chambers and base 2 successively; Described laser diode 8, collimating module 10, GRIN Lens 12 and optical fiber coupling head 13 same optical axises, described collimating module 10 is that the back non-spherical lens 102 that face type that the face type by sagittal surface is different from the preceding non-spherical lens 101 of meridian plane face type and sagittal surface is different from meridian plane face type constitutes, the preceding non-spherical lens 101 of this collimating module 10 and the projection of back non-spherical lens 102 in sagittal surface are respectively hyperbola and straight line, non-spherical lens 101 and the projection of back non-spherical lens 102 in meridian plane are respectively semicircle and semiellipse curve before described, as shown in Figure 4 and Figure 5, the input end face of this collimating module 10 and output end face all are coated with the anti-reflection film to the emission wavelength of laser diode 8, the non-spherical lens 101 of the input of this collimating module 10 is over against the light-emitting area of described laser diode 8, the output of this collimating module 10 is a non-spherical lens 102, over against described GRIN Lens 12.
Described heat radiation copper billet 5 and heat sink copper billet 6 fuse, side at this heat radiation copper billet 5 is respectively equipped with the hole to put thermistor 7, a side has light watch-dog 11 on the light-emitting area of laser diode 8, the input end face of described collimating module 10 is relative with the light-emitting area of laser diode 8 by coupling distance control piece 9, the groove 16 that one semicircle is arranged on its central axis of the right surperficial upper edge of heat sink copper billet 6, described optical fiber coupling head 13 place in this groove 16 and by fixing 20 of coupling and fixedly vest 14 be fixed in the coupling main brace spare 3, at fixing vest 14, fill up inserts between the groove 16 on fixing 20 of coupling and the heat sink copper billet 6 and constitute packed layer 15.
The light-emitting area of described laser diode 8 is controlled by coupling distance control piece 9 to the coupling distance d between collimating module 10 input end faces, and coupling distance d is controlled at d≤198 μ m.
Described GRIN Lens 12 is gradually changed refractive indexes, the long P of its joint
t=0.25, the output end face of this GRIN Lens 12 promptly is the input end face of monomode fiber 23, and the both ends of the surface of this GRIN Lens 12 all are coated with the anti-reflection film to laser diode 8 operation wavelengths.
The center that described coupling is fixing 20 is the optical fiber coupling head 13 of optical fiber 23 front ends just.
Be with tubule cover 18 on the cylindrical of described optical fiber 23, on the cylindrical of this tubule cover 18, be with metal pipe box 17, between the cylindrical of optical fiber 23 and tubule cover 18 and at tubule, overlapping between 18 cylindricals and the metal pipe box 17 fixing seal layer 19 all arranged) other end of this optical fiber 23 stretches out outside the main brace spare 3 that is coupled, end near this coupling main brace spare 3 is with copper pipe 21 on optical fiber 23 outer rings, between optical fiber 23 cylindricals and copper pipe 21 heat-shrink tube 22 is arranged, the tail end of this optical fiber 23 has the connector 24 of band connector core 25.
The span of the angle of inclination beta of the optic fibre input end face of described optical fiber coupling head 13 is 6 °＜β≤8 °.
Packed layer 15 between the groove 16 on fixing 20 of described fixedly vest 14, coupling and the heat sink copper billet 6 is that soldering adds epoxy glue layer and constitutes, and overlaps between 18 and the fixing seal layer 19 that overlaps between 18 cylindricals and the metal pipe box 17 at tubule is that soldering adds the epoxy glue layer formation at optical fiber 23 cylindricals and tubule.
Described fixedly vest 14 is that kovar is made
Described tubule cover is quartzy tubule or capillary glass tube.
The monomode fiber of the preferred embodiments of the present invention, high with a tight waist more listed than the performance parameter such as the following table of high-power laser diode 8, collimating module 10, GRIN Lens 12 and coupling filter.
Be the tabulation of three embodiment of the present invention below.
| Member | Feature or parameter |
| Monomode fiber | Standard molten silicon step-index single-mode fiber, angle of inclination beta=7 of the input end face of optical fiber |
| The high high-power laser diode that compares with a tight waist | Export continuously: 4W, wavelength X=780nm, light-emitting area is 300 μ m * 1 μ m, luminous exitance θ ⊥×θ ∥＜45°×10°(FW1/e 2) |
| Collimating module | To above-mentioned operation wavelength λ=780nm, material: molten silicon, diameter of phi=2mm, non-spherical |
| GRIN Lens | Operation wavelength λ: 780nm～830nm, diameter of phi=2mm, length L=5mm saves long P t=0.24mm, anti-reflection film is plated to operation wavelength λ=780nm in the input and output two ends |
| Main performance of the present invention | High laser beam coupling efficiency 63% than high-power laser diode with a tight waist, tail optical fiber fiber power P CW=2.52W has only basic mode (PL after the filtering 01) output |
| Member | Feature or |
| Monomode fiber | |
| 23 | Standard molten silicon step-index single-mode fiber, angle of inclination beta=8 of the input end face of optical fiber |
| The high high-power laser diode that compares with a tight waist | Continuous laser output: 1W wavelength X=800nm, light-emitting area is 200 μ m * 1 μ m, luminous exitance θ ⊥×θ ∥＜60°×12°(FW1/e 2) |
| Collimating module | Operation wavelength λ=800nm, material: molten silicon, diameter of phi=2mm, non-spherical |
| GRIN Lens | Operation wavelength λ: 780nm～830nm, diameter of phi=2mm, length L=5mm saves long P t=0.25mm, anti-reflection film is plated to operation wavelength λ=800nm in the input and output two ends |
| The performance that the present invention is main | With a tight waist to height than LD laser beam coupling efficiency 68%, tail optical fiber fiber power P CW=0.68W has only basic mode (PL after the filtering 01) output |
| Member | Feature or parameter |
| Monomode fiber | Standard molten silicon step-index single-mode fiber, angle of inclination beta=8 of the input end face of optical fiber coupling input head 13 ° |
| The high high-power laser diode that compares with a tight waist | Laser diode is exported continuously: 2W wavelength X=830nm, light-emitting area is 200 μ m * 1 μ m, luminous exitance θ ⊥×θ ∥＜80°×12°(FW1/e 2) |
| Collimating module | To above-mentioned operation wavelength λ=830nm, material: molten silicon, diameter of phi=2mm, non-spherical lens 101 has best hyperbolic configuration in the projection of sagittal surface before length L=1mm: real axis A=81 μ m, non-spherical lens 101 has the structure of nearly circle before the imaginary axis B=86 μ m in the projection of meridian plane: non-spherical lens 102 has linear structure in the projection of sagittal surface behind radius R=177 μ m: non-spherical lens 102 has best oval structure in the projection of meridian plane behind the standoff height H=2mm: major axis C2=691 μ m, minor axis D2=503 μ m input end face and output end face all plate anti-reflection film to operation wavelength λ=800nm |
| GRIN Lens | Operation wavelength λ: 780nm～830nm, diameter of phi=2mm, length L=5mm saves long P t=0.25mm, anti-reflection film is plated to operation wavelength λ=830nm in the input and output two ends |
| The performance that the present invention is main | With a tight waist to height than LD laser beam coupling efficiency 76%, tail optical fiber fiber power P CW=1.52W has only basic mode (PL after the filtering 01) output |
In sum, the present invention has the laser diode of monomode fiber coupling and spatial filter, because the spatial model filter action of monomode fiber makes that light beam is basic mode (PL
01) output, collimating module has special construction, the collection anaberration, anastigmatic acting on all over the body, make light beam behind the collimation at fast, slow axis all near the wavy attitude in ideal plane, and subcircular hot spot output, this is very favourable to improving the laser output beam characteristic, coupling efficiency: 50%～76%.
Claims (10)
1, a kind of laser diode with monomode fiber coupling and spatial filter, be characterised in that its formation comprises base (2) and the coupling main brace spare (3) that has shell electrode (1), is equipped with semiconductor cooler (4), heat radiation copper billet (5), heat sink copper billet (6), laser diode (8), coupling distance control piece (9), collimating module (10), GRIN Lens (12) and optical fiber coupling head (13) successively on the central axis of coupling main brace spare (3) inner chamber and base (2); Described laser diode (8), collimating module (10), GRIN Lens (12) and the same optical axis of optical fiber coupling head (13), described collimating module (10) is that the back non-spherical lens (102) that face type that the face type by sagittal surface is different from the preceding non-spherical lens (101) of meridian plane face type and sagittal surface is different from meridian plane face type constitutes, preceding non-spherical lens (101) of this collimating module (10) and the projection of back non-spherical lens (102) in sagittal surface are respectively hyperbola and straight line, non-spherical lens (101) and the projection of back non-spherical lens (102) in meridian plane are respectively semicircle and semiellipse curve before described, input end face of this collimating module (10) and output end face all are coated with the anti-reflection film to the emission wavelength of laser diode (8), the non-spherical lens (101) of the input of this collimating module (10) is over against the light-emitting area of described laser diode (8), the output of this collimating module (10) is non-spherical lens (102), over against described GRIN Lens (12).
2, laser diode single-mode optical-fibre coupler according to claim 1, it is characterized in that described heat radiation copper billet (5) and heat sink copper billet (6) fuse, side at this heat radiation copper billet (5) is respectively equipped with the hole to put thermistor (7), a side has light watch-dog (11) on the light-emitting area of laser diode (8), the input end face of described collimating module (10) is relative with the light-emitting area of laser diode (8) by coupling distance control piece (9), the groove (16) that one semicircle is arranged on its central axis of the right surperficial upper edge of heat sink copper billet (6), described optical fiber coupling head (13) place in this groove (16) and by the fixing head of coupling (20) and fixedly vest (14) be fixed in the main brace spare (3) that is coupled, at fixing vest (14), fill up inserts between the groove (16) on fixing head of coupling (20) and the heat sink copper billet (6) and constitute packed layer (15).
3, laser diode single-mode optical-fibre coupler according to claim 1, the light-emitting area that it is characterized in that described laser diode (8) is controlled by coupling distance control piece (9) to the coupling distance d between collimating module (10) input end face, and coupling distance d is controlled at d≤198 μ m.
4, laser diode single-mode optical-fibre coupler according to claim 1 is characterized in that described GRIN Lens (12) is a gradually changed refractive index, the long P of its joint
t=0.25, the output end face of this GRIN Lens (12) promptly is the input end face of monomode fiber (23), and the both ends of the surface of this GRIN Lens (12) all are coated with the anti-reflection film to laser diode (8) operation wavelength.
5, laser diode single-mode optical-fibre coupler according to claim 1, the center that it is characterized in that the fixing head of described coupling (20) is the optical fiber coupling head (13) of optical fiber (23) front end just.
6, laser diode single-mode optical-fibre coupler according to claim 1, it is characterized in that being with tubule cover (18) on the cylindrical of described optical fiber (23), on the cylindrical of this tubule cover (18), be with metal pipe box (17), between the cylindrical of optical fiber (23) and tubule cover (18) and between tubule cover (18) cylindrical and metal pipe box (17), fixing seal layer (19) is arranged all, the other end of this optical fiber (23) stretches out outside the coupling main brace spare (3), end near this coupling main brace spare (3) is with copper pipe (21) on optical fiber (23) outer ring, between optical fiber (23) cylindrical and copper pipe (21) heat-shrink tube (22) is arranged, the tail end of this optical fiber (23) has the connector (24) of band connector core (25).
7, laser diode single-mode optical-fibre coupler according to claim 1, the span of angle of inclination beta that it is characterized in that the optic fibre input end face of described optical fiber coupling head (13) are 6 °＜β＜8 °.
8, laser diode single-mode optical-fibre coupler according to claim 1, it is characterized in that packed layer (15) between the groove (16) on described fixedly vest (14), the fixing head of coupling (20) and the heat sink copper billet (6) is that soldering adds epoxy glue layer and constitutes, between optical fiber (23) cylindrical and the tubule cover (18) and the fixing seal layer (19) between tubule cover (18) cylindrical and metal pipe box (17) be that soldering adds the epoxy glue layer formation.
9, laser diode single-mode optical-fibre coupler according to claim 1 is characterized in that described fixedly vest (14) is that kovar is made
10, according to 9 each described laser diode single-mode optical-fibre couplers of claim 1, it is characterized in that described tubule cover (18) is quartzy tubule or capillary glass tube.
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| CNB2005100241742A CN1299409C (en) | 2005-03-02 | 2005-03-02 | Laser LED with single mode optical fibre coupling and spatial filter |
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| CNB2005100241742A CN1299409C (en) | 2005-03-02 | 2005-03-02 | Laser LED with single mode optical fibre coupling and spatial filter |
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| CN101438195B (en) * | 2005-10-07 | 2012-06-13 | 通快激光两合公司 | F/theta lens system and scanner device equipped therewith |
| CN103370643A (en) * | 2011-02-10 | 2013-10-23 | 住友电工光电子器件创新株式会社 | Optical module having enhanced optical coupling efficiency between laser diode and optical fiber |
| CN106959493A (en) * | 2017-05-17 | 2017-07-18 | 莱特巴斯光学仪器（镇江）有限公司 | It is a kind of by LD and the component of fiber coupling |
| CN109917521A (en) * | 2019-03-19 | 2019-06-21 | 浙江光塔节能科技有限公司 | A kind of fiber coupling system, coupling light beam regulation method |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3489323B2 (en) * | 1996-03-25 | 2004-01-19 | 三菱電機株式会社 | Laser diode module, light condensing part and optical coupling method |
| CN1095549C (en) * | 1999-09-30 | 2002-12-04 | 中国科学院上海光学精密机械研究所 | Coupler between laser diode and optical fiber |
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| CN2785213Y (en) * | 2005-03-02 | 2006-05-31 | 中国科学院上海光学精密机械研究所 | Laser diode with single module optical fiber coupler and space filter |
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2005
- 2005-03-02 CN CNB2005100241742A patent/CN1299409C/en not_active Expired - Fee Related
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| CN109917521B (en) * | 2019-03-19 | 2023-11-24 | 浙江光塔安全科技有限公司 | Optical fiber coupling system and coupling light beam adjusting method |
| CN111048989A (en) * | 2019-12-27 | 2020-04-21 | 中国科学院半导体研究所 | Optical fiber coupling output semiconductor laser |
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