CN105572066B - A kind of test device and method of rare-earth-doped fiber precast rod absorption coefficient - Google Patents
A kind of test device and method of rare-earth-doped fiber precast rod absorption coefficient Download PDFInfo
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- CN105572066B CN105572066B CN201610101209.6A CN201610101209A CN105572066B CN 105572066 B CN105572066 B CN 105572066B CN 201610101209 A CN201610101209 A CN 201610101209A CN 105572066 B CN105572066 B CN 105572066B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
A kind of test device and method of rare-earth-doped fiber precast rod absorption coefficient, it is related to special optical fiber testing field, including LD pumping sources, energy-transmission optic fibre, high reflective grid, accurate combination displacement platform, power meter and sample stage, rare-earth-doped fiber precast rod to be measured is cut into cylinder slice, it is 5W, the performance number P of power meter to survey LD pumping source power0Cylinder slice is placed in sample stage, Y direction is adjusted, ensure that central shaft, the central shaft of energy-transmission optic fibre in V-groove and the central shaft of power meter of cylinder slice are generally aligned in the same plane, X-direction is adjusted, the central shaft of power meter is set to pass through the one side edge of cylinder slice, when measurement LD pumping source power is 5W, the performance number P of power meter1, according to formula absorption coefficient=10 × lg (P0/P1), it obtains cylinder and is sliced the position absorption coefficient；The present invention can directly measure the absorption coefficient of rare-earth-doped fiber precast rod, improve efficiency of research and development, reduce R＆D costs.
Description
Technical field
The present invention relates to special optical fiber testing fields, and in particular to a kind of test of rare-earth-doped fiber precast rod absorption coefficient
Device and method.
Background technology
In recent years, domestic and international optical fiber laser rapid development, optical fiber laser application range is very extensive, including laser light
Fine communication, laser space remote communication, industrial shipbuilding, medical instrument instrument and equipment, large foundation construction, as other lasers
Pumping source etc..Therefore, for the demand sharp increase of core component-rare earth doped fiber of optical fiber laser.
Absorption coefficient can characterize the rare earth ion doped level of prefabricated rods, as characterization rare earth doped fiber laser fan-out capability
An index, it is extremely important.And traditional method can only could measure the coefficient that is absorbed after fibre-optical drawing comes out.
The entire preparation process link of rare earth doped fiber is more, flow is complicated, measurement period is long；It is different and in rare earth doped fiber
Radial position, absorption coefficient is different, therefore in R＆D process, and the feedback time for obtaining absorption coefficient index is long, significantly shadow
Efficiency of research and development is rung.It is required for entirely preparing rare earth doped fiber in addition, obtaining absorption coefficient each time, increases R＆D costs.
Invention content
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of absorptions of rare-earth-doped fiber precast rod
The test device and method of coefficient can directly measure the absorption coefficient of rare-earth-doped fiber precast rod, improve efficiency of research and development, reduce
R＆D costs.
To achieve the above objectives, the present invention takes a kind of test device of rare-earth-doped fiber precast rod absorption coefficient, including
LD pumping sources, energy-transmission optic fibre, high reflective grid, accurate combination displacement platform, power meter and moveable sample stage, LD pumping sources
Tail optical fiber connect with the injection end of high reflective grid, the output end of high reflective grid is connect with energy-transmission optic fibre, and the precision combines displacement
Platform top is set there are one V-shaped groove, and the other end of energy-transmission optic fibre is pierced by along the V-groove, and precision combination displacement platform is outer, V-groove
A power meter is arranged in tank circuit direction, and the central shaft of both energy-transmission optic fibre and power meter is located at same straight line, the sample load
Platform is set between V-groove and power meter, and the cylinder slice of rare-earth-doped fiber precast rod to be measured, and circle are placed on sample stage
Cylinder slice, power meter and the central shaft of the energy-transmission optic fibre three in V-groove are located at same level.
Based on the above technical solution, the rare earth ion that the wavelength of the LD pumping sources is adulterated according to preform
Depending on absorption, when rare earth ion is ytterbium ion, wavelength is 976nm or 915nm；When rare earth ion is erbium ion, wavelength 980nm
Or 1480nm, when rare earth ion is thulium ion, wavelength 793nm.
Based on the above technical solution, the size of the tail optical fiber is consistent with the high reflective size of grid injection end, and tail
The fine splice loss, splice attenuation with high reflective grid injection end is less than 0.03dB.
Based on the above technical solution, the size of the energy-transmission optic fibre is consistent with the high reflective size of grid output end,
And the splice loss, splice attenuation of energy-transmission optic fibre and high reflective grid output end is less than 0.03dB.
Based on the above technical solution, the power of the power meter is equal to or higher than LD pumping source maximum powers.
Based on the above technical solution, the maximum power of the LD pumping sources is 10W.
Based on the above technical solution, the sample stage includes pedestal and two convex blocks positioned at base top surface,
The cylinder slice of rare-earth-doped fiber precast rod to be measured, and the outer diameter and two convex blocks of cylinder slice are placed between two convex blocks
Opposed inner walls it is tangent.
The present invention also provides a kind of test methods of rare-earth-doped fiber precast rod absorption coefficient, including step：It S1. will be to be measured
Rare-earth-doped fiber precast rod is cut into the cylinder that thickness is 10mm to be measured and is sliced；S2., when cylinder slice is not installed, survey
When amount LD pumping source power is 5W, the performance number P of power meter0；S3. cylinder slice is positioned on sample stage, two
Section is respectively facing power meter and accurate combination displacement platform；S4. sample stage is adjusted in the position of Y direction, ensures cylinder
The central shaft of slice, the central shaft of energy-transmission optic fibre in V-groove and the central shaft of power meter are generally aligned in the same plane；S5. sample is adjusted
Product microscope carrier makes the central shaft of power meter pass through the one side edge of cylinder slice, measures LD pumping source work(in the position of X-direction
When rate is 5W, the performance number P of power meter1；S6. according to formula absorption coefficient=- 10 × lg (P0/P1), obtaining cylinder slice should
Position absorption coefficient；S7. it adjusts sample stage to move in X-direction, every identical spacing, measures and count according to step S5, S6
It calculates once, until the central shaft of power meter passes through another lateral edges of cylinder slice, obtains cylinder slice in different diameters
To the absorption coefficient of position.
Based on the above technical solution, the sample stage includes pedestal and two convex blocks positioned at base top surface,
Cylinder is sliced the radially tangential placement of opposed inner walls with two convex blocks, and straight line where two convex blocks is X-direction, cylinder
The Y direction in pedestal is arranged in slice.
The beneficial effects of the present invention are：By mobile example microscope carrier in the position of X-direction and Y direction, circle is measured
Cylinder is sliced the output power in different radial positions, and rare-earth-doped fiber precast rod is obtained by calculation respectively in different positions
The absorption coefficient set, the feedback time for obtaining absorption coefficient index is short, to improve efficiency of research and development.Additionally, it is not necessary to draw light
Fibre reduces the cost of research and development.
Description of the drawings
Fig. 1 is the overlooking structure diagram of the test device of rare-earth-doped fiber precast rod absorption coefficient of the embodiment of the present invention；
Fig. 2 is the left side view for the sample stage that cylinder slice is placed in Fig. 1.
Reference numeral：
LD pumping sources 1, tail optical fiber 2, high reflective grid 3, energy-transmission optic fibre 4, precision combination displacement platform 5, V-groove 51, sample stage
6, pedestal 61, convex block 62, power meter 7, cylinder slice 8.
Specific implementation mode
Invention is further described in detail with reference to the accompanying drawings and embodiments.
As shown in Figure 1, the test device of rare-earth-doped fiber precast rod absorption coefficient of the present invention, including LD pumping sources 1, height are anti-
(HR) grating 3, energy-transmission optic fibre 4, accurate combination displacement platform 5, power meter 7 and moveable sample stage 6.LD pumping sources 1
Tail optical fiber 2 is connect with the injection end of high reflective grid 3, and the output end of high reflective grid 3 is connect with energy-transmission optic fibre 4.The precision combination bit
5 top of moving stage is set there are one V-shaped groove 51, and the other end of energy-transmission optic fibre 4 is pierced by along the V-groove 51.Test device of the present invention is also
Including a power meter 7, power meter 7 is located at except accurate combination displacement platform 5, on the tank circuit direction of V-groove 51, power meter 7
Power is equal to or higher than the maximum power of LD pumping sources 1, in general, the maximum power of LD pumping sources 1 is generally 10W.The biography energy
The central shaft (being represented by dashed line in Fig. 1) of 7 the two of optical fiber 4 and power meter is located at same straight line, specifically, can be in V-groove 51
Top, push down energy-transmission optic fibre 4 using pressing plate, position of the energy-transmission optic fibre 4 in V-groove 51 made to be relatively fixed, pass through adjust essence
Close combination displacement platform 5 makes the central shaft of both energy-transmission optic fibre 4 and power meter 7 be located at same straight line.The sample stage 6 is arranged
Between V-groove 51 and power meter 7, the cylinder slice 8 of rare-earth-doped fiber precast rod to be measured, and circle are placed on sample stage 6
Energy-transmission optic fibre 4 in cylinder slice 8, power meter 7 and V-groove 51, the central shaft of three are located at same level.
Specifically, the power of the LD pumping sources is 10W；The wavelength of LD pumping sources 1, according to the dilute of preform doping
Depending on native Ions Absorption：When the rare earth ion of doping is ytterbium ion, the wavelength of LD pumping sources 1 is 976nm or 915nm；When mixing
When miscellaneous rare earth ion is erbium ion, the wavelength of LD pumping sources 1 is 980nm or 1480nm, when the rare earth ion of doping be thulium from
The wavelength of the period of the day from 11 p.m. to 1 a.m, LD pumping sources 1 is 793nm.The size of the tail optical fiber 2 is consistent with the high reflective size of 3 injection end of grid, and tail optical fiber
2 are less than 0.03dB with the splice loss, splice attenuation of high reflective 3 injection end of grid；The size of the size of energy-transmission optic fibre 4 and high reflective 3 output end of grid
Unanimously, and energy-transmission optic fibre 4 and the splice loss, splice attenuation of high reflective 3 output end of grid are less than 0.03dB.
As shown in Fig. 2, specifically, sample stage 6 include pedestal 61 and two convex blocks 62 positioned at 61 top surface of pedestal, two
The cylinder slice 8 of rare-earth-doped fiber precast rod to be measured, and the outer diameter and two convex blocks of cylinder slice 8 are placed between convex block 62
62 opposed inner walls are tangent.Rectilinear direction where two convex blocks 62, as the X-direction that sample stage 6 moves, cylinder is cut
Piece 8 is placed in or is taken out by 61 top of pedestal, this direction is the Y direction that sample stage 6 moves, and sample stage 6 can be in X-axis
Direction and Y direction movement.
The present invention is based on the test methods of the rare-earth-doped fiber precast rod absorption coefficient of above-mentioned apparatus, including following specific step
Suddenly：
S1. radial to be measured to cut by rare-earth-doped fiber precast rod to be measured, it is cut into the cylinder that thickness is 10mm and is sliced
8。
S2. when not installing cylinder slice 8, when the power for measuring LD pumping sources 1 is 5W, the performance number P of power meter 70。
S3. cylinder slice 8 is positioned on the pedestal 61 of sample stage 6, and two section is made to be respectively facing power
Meter 7 and accurate combination displacement platform 5, that is, the opposed inner walls of the outer diameter and two convex blocks 62 of cylinder slice 8 are tangent.
S4. sample stage 6 is adjusted in the position of Y direction, ensures to pass energy in the central shaft of cylinder slice 8, V-groove 51
The central shaft of optical fiber 4 and the central shaft of power meter 7 are generally aligned in the same plane.
S5. sample stage 6 is adjusted in the position of X-direction, and the central shaft of power meter 7 is made to pass through the one of cylinder slice 8
Lateral edges, when measurement LD pumping source power is 5W, the performance number P of power meter1。
S6. according to formula absorption coefficient asorbtion=-10 × lg (P0/P1), obtain cylinder slice 8 in the position
Absorption coefficient asorbtion.
S7. it adjusts sample stage 6 to move in X-direction, every identical spacing (choosing 2mm in the present embodiment), according to step
Rapid S5, S6 are measured and are calculated once, until the central shaft of power meter 7 passes through another lateral edges of cylinder slice 8, obtain cylinder
Absorption coefficient of the body slice 8 in different radial positions.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as the protection of the present invention
Within the scope of.The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of test device of rare-earth-doped fiber precast rod absorption coefficient, including LD pumping sources, energy-transmission optic fibre, high reflective grid,
Precision combination displacement platform, power meter and moveable sample stage, it is characterised in that：The tail optical fiber of LD pumping sources and high reflective grid
Injection end connection, the output end of high reflective grid connect with energy-transmission optic fibre, it is described it is accurate combine displacement platform top set there are one V-type
The other end of slot, energy-transmission optic fibre is pierced by along the V-groove, and precision combines outside displacement platform, a work(is arranged in the tank circuit direction of V-groove
Rate meter, and the central shaft of both energy-transmission optic fibre and power meter is located at same straight line, the sample stage is set to V-groove and power
The cylinder slice of rare-earth-doped fiber precast rod to be measured, and cylinder slice, power meter and V are placed between meter, on sample stage
The central shaft of energy-transmission optic fibre three in type groove is located at same level.
2. the test device of rare-earth-doped fiber precast rod absorption coefficient as described in claim 1, it is characterised in that：The LD pumps
The wavelength in Pu source is depending on the rare earth ion that preform adulterates absorbs, when rare earth ion is ytterbium ion, wavelength 976nm
Or 915nm；When rare earth ion is erbium ion, wavelength is 980nm or 1480nm, and when rare earth ion is thulium ion, wavelength is
793nm。
3. the test device of rare-earth-doped fiber precast rod absorption coefficient as described in claim 1, it is characterised in that：The tail optical fiber
Size it is consistent with the high reflective size of grid injection end, and the splice loss, splice attenuation of tail optical fiber and high reflective grid injection end is less than 0.03dB.
4. the test device of rare-earth-doped fiber precast rod absorption coefficient as described in claim 1, it is characterised in that：The biography energy
The size of optical fiber is consistent with the high reflective size of grid output end, and the splice loss, splice attenuation of energy-transmission optic fibre and high reflective grid output end is less than
0.03dB。
5. the test device of rare-earth-doped fiber precast rod absorption coefficient as described in claim 1, it is characterised in that：The power
The power of meter is equal to or higher than LD pumping source maximum powers.
6. the test device of rare-earth-doped fiber precast rod absorption coefficient as claimed in claim 5, it is characterised in that：The LD pumps
The maximum power in Pu source is 10W.
7. the test device of rare-earth-doped fiber precast rod absorption coefficient as described in claim 1, it is characterised in that：The sample
Microscope carrier includes pedestal and two convex blocks positioned at base top surface, and the circle of rare-earth-doped fiber precast rod to be measured is placed between two convex blocks
Cylinder is sliced, and the opposed inner walls of the outer diameter and two convex blocks of cylinder slice are tangent.
8. a kind of test method of the rare-earth-doped fiber precast rod absorption coefficient based on claim 1 described device, feature exist
In, including step：
S1. by rare-earth-doped fiber precast rod to be measured, being cut into the cylinder that thickness is 10mm to be measured is sliced；
S2., when cylinder slice is not installed, when measurement LD pumping source power is 5W, the performance number P of power meter0；
S3. cylinder slice is positioned on sample stage, two section is respectively facing power meter and accurate combination displacement platform；
S4. sample stage is adjusted in the position of Y direction, ensures the central shaft of cylinder slice, energy-transmission optic fibre in V-groove
The central shaft of central shaft and power meter is generally aligned in the same plane；
S5. sample stage is adjusted in the position of X-direction, and the central shaft of power meter is made to pass through the one side edge of cylinder slice,
When measurement LD pumping source power is 5W, the performance number P of power meter1；
S6. according to formula absorption coefficient=- 10 × lg (P0/P1), it obtains cylinder and is sliced the position absorption coefficient；
S7. it adjusts sample stage to move in X-direction, every identical spacing, measures and calculated once, directly according to step S5, S6
Another lateral edges that cylinder slice is passed through to the central shaft of power meter obtain suction of the cylinder slice in different radial positions
Receive coefficient.
9. the test method of rare-earth-doped fiber precast rod absorption coefficient as claimed in claim 8, it is characterised in that：The sample
Microscope carrier includes pedestal and two convex blocks positioned at base top surface, cylinder slice with the opposed inner walls of two convex blocks are radially tangential puts
It sets, and straight line where two convex blocks is X-direction, the Y direction in pedestal is arranged in cylinder slice.
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| CN107238485B (en) * | 2017-06-30 | 2019-05-17 | 华中科技大学鄂州工业技术研究院 | A method of test double clad gain fibre pump absorption coefficient |
| CN107478602A (en) * | 2017-09-30 | 2017-12-15 | 中国工程物理研究院激光聚变研究中心 | Absorption coefficient measuring device and method |
| CN112763184B (en) * | 2020-12-23 | 2023-08-29 | 中国人民解放军国防科技大学 | Gain fiber absorption coefficient measuring device and method based on side scattered light detection |
| CN114199517A (en) * | 2021-12-10 | 2022-03-18 | 中国电子科技集团公司第四十六研究所 | Device and method for testing axial absorption uniformity of rare earth-doped optical fiber preform |
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