CN205538713U - Light and heat weak absorption testing arrangement - Google Patents
Light and heat weak absorption testing arrangement Download PDFInfo
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- CN205538713U CN205538713U CN201620117076.7U CN201620117076U CN205538713U CN 205538713 U CN205538713 U CN 205538713U CN 201620117076 U CN201620117076 U CN 201620117076U CN 205538713 U CN205538713 U CN 205538713U
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Abstract
The utility model provides a light and heat weak absorption testing arrangement belongs to the test technical field of optical element absorption rate, light and heat weak absorption testing arrangement includes first light source, secondary light source, fine setting platform and detector, need checking sample place in on the fine setting platform. Position through fine setting platform regulation need checking sample makes the pumping light process that first light source sent need checking sample's center pin just focuses on predetermineeing of need checking sample is awaited measuring a little, makes the detection light that the secondary light source sent also passes through need checking sample's center pin just focuses on predetermine and await measuring a little, just the focusing spot area of surveying light is greater than the focusing spot area of pumping light sees through need checking sample's detection light incidence extremely the detector. The embodiment of the utility model provides a light and heat weak absorption testing arrangement has realized being refracting indexes such as optic fibre or optical fiber perform absorption characteristic's a little less than the optical structure's that the axial symmetry distributes the light and heat test effectively.
Description
Technical field
This utility model relates to the technical field of measurement and test of optical element absorbance, specifically,
Relate to a kind of photo-thermal weak absorbing test device.
Background technology
Optical fiber laser have efficiency height, good heat dissipation, output beam quality height, compact conformation,
The plurality of advantages such as it is easily maintained, is widely used in communication, industrial, military, medical etc. each
Individual field.Along with expansion and the raising of actual demand of application, laser instrument is promoted to export
Power improves constantly.
The gain media of optical fiber laser is Active Optical Fiber, and the optics of Active Optical Fiber and material are special
Property determines fan-out capability and the serviceability of optical fiber laser, and optical fiber is preform
At high temperature drawing obtains, and the quality of prefabricated rods determines the quality of optical fiber.Active Optical Fiber
Core uniform doping and the various defects (such as impurity, colour center etc.) that are likely to occur are to optical fiber
Performance has a significant impact, and uneven meeting of adulterating causes optical fiber inside-pumping light and flashlight energy to divide
Cloth is uneven, and defect may become absorption singular point, causes optical fibre damage.Therefore, right
Above-mentioned two parameter characterizes, and understands optical fiber or the uniform doping of preform and suction
Receive defect and absorb level and distribution situation, to improve optical fiber or the preparation technology of preform,
Promote components and parts performance and have very important meaning.But, the most not to prefabricated rods and
Finished product optical fiber uniform doping and the means of native defect detection.
Fibre core dopant ion is higher than base material (fused quartz) to the absorption level of laser, can pass through
The uniform absorption measuring optical fiber or preform judges uniform doping, by detection fibre
The absorption horizontal abnormality of core segment judges native defect.The Weak Absorption level of material is general
Photo-thermal weak absorbing equipment is used to characterize.But the test of existing photo-thermal weak absorbing test equipment
To as if refractive index homogeneity distribution optical material or film layer, if be used directly to test optical fiber or
The optical texture that the refractive indexs such as preform are distributed axisymmetricly, can cause pump light and spy
Light-metering is in the multiple reflection inside of above-mentioned optical texture or refraction, due to detection light and pump light
Wavelength difference is relatively big, is likely to because folding, reflection cause transmission path different at inside of optical fibre,
Focal spot is likely to no longer overlap, and now, the result that reception equipment is detected cannot be reacted
Stating the real material behavior of optical texture, reliability is poor.Additionally no less important a bit,
Repeatedly being rolled over owing to carrying the detection light of absorption information, reflect, its Exit positions the most all can
Deviate the receiving plane of reception equipment, and bias would generally change with the change of test position,
So that receiving surface does not receives complete signal hot spot and affects result of detection.Therefore, adopt
Cannot be reliably completed with existing heat absorption test equipment and optical fiber or preform etc. are reflected
The test job of the photo-thermal weak absorbing performance of the optical texture that rate is distributed axisymmetricly.
Utility model content
In consideration of it, the purpose of this utility model is to provide a kind of photo-thermal weak absorbing test device,
The optics that the refractive index such as optical fiber and preform is distributed axisymmetricly can be effectively realized
The photo-thermal weak absorbing performance test of structure.
To achieve these goals, the technical scheme that this utility model embodiment uses is as follows:
First aspect, this utility model embodiment provides a kind of photo-thermal weak absorbing test device,
Including: the first light source, secondary light source, fine adjustment stage and detector, testing sample is positioned over
In described fine adjustment stage, axially symmetric structure centered by described testing sample, described testing sample
Refractive index be distributed axisymmetricly；The pump light that described first light source sends is through described to be measured
The central shaft of sample and focus on the default tested point of described testing sample, described secondary light source
The detection light sent also passes through the central shaft of described testing sample and focuses on described default to be measured
Point, the focal beam spot area of described detection light is more than the focal beam spot area of described pump light,
Detection light through described testing sample is incident to described detector.
In conjunction with first aspect, the first possibility that this utility model additionally provides first aspect is real
Execute mode, wherein, the pump light that described first light source sends and the center of described testing sample
Axle becomes first to preset angle incidence, and the detection light that described secondary light source sends treats test sample with described
The central shaft of product becomes second to preset angle incidence, and described first presets the size of angle with described
Second size presetting angle is all higher than equal to 85 degree less than or equal to 90 degree.
In conjunction with the first possible embodiment of first aspect or first aspect, this utility model
Additionally provide the possible embodiment of the second of first aspect, wherein, described photo-thermal weak absorbing
Test device also includes entering with assisted calibration through the pump light of described testing sample for reception
The alignment monitoring modular in the direction of the pump light being mapped on testing sample, described first light source is sent out
The pump light gone out incides on described testing sample, and the pump light through described testing sample enters
It is mapped to described alignment monitoring modular.
In conjunction with first aspect the second may embodiment, this utility model additionally provides the
On the one hand the third possible embodiment, wherein, described first light source treats test sample with described
The default tested point for described pump light being focused on described testing sample it is provided with between product
First expand Shaping Module, be provided with use between described secondary light source and described testing sample
Shaping is expanded in the second of the default tested point that described detection light is focused on described testing sample
Module；The pump light that described first light source sends expands the whole of Shaping Module through described first
Shape convergence focuses on the default tested point of described testing sample after processing；Described secondary light source is sent out
The detection light gone out focuses on institute after the described second shaping convergence expanding Shaping Module processes
State the default tested point of testing sample.
In conjunction with first aspect the third may embodiment, this utility model additionally provides the
The possible embodiment of the 4th kind on the one hand, wherein, described photo-thermal weak absorbing test device is also
Including for the detection luminous reflectance after Shaping Module shaping is assembled will be expanded to described through second
The reflecting mirror focused on the default tested point of testing sample, described reflecting mirror is arranged at described the
Two expand between Shaping Module and described testing sample.
In conjunction with the 4th kind of first aspect may embodiment, this utility model additionally provides the
On the one hand the 5th kind may embodiment, wherein, described detector include filtration module,
Photoelectric conversion module and signal analysis module, described filtration module, described photoelectric conversion module
And described signal analysis module couples successively, through the detection light of described testing sample through institute
Described photoelectric conversion module is entered, through described opto-electronic conversion after stating the Filtering Processing of filtration module
Module is converted to the signal of telecommunication and is sent to described signal analysis module.
In conjunction with the 5th kind of first aspect may embodiment, this utility model additionally provides the
The possible embodiment of the 6th kind on the one hand, wherein, described filtration module includes collecting lens
And diaphragm, by the detection light of described testing sample outgoing, sequentially pass through described collecting lens and
Described photoelectric conversion module is incided after described diaphragm.
In conjunction with the 6th kind of first aspect may embodiment, this utility model additionally provides the
The possible embodiment of the 7th kind on the one hand, wherein, described detector also includes filtration module,
Described filtration module is arranged between described testing sample and described filtration module.
In conjunction with the 7th kind of first aspect may embodiment, this utility model additionally provides the
The possible embodiment of the 8th kind on the one hand, wherein, described first light source is for being used for the company of output
The pump light source of continuous laser beam.
In conjunction with the 8th kind of first aspect may embodiment, this utility model additionally provides the
The possible embodiment of the 9th kind on the one hand, wherein, described secondary light source is He-Ne laser
Device.
In the photo-thermal weak absorbing device that this utility model embodiment provides, by optical fiber and predispersed fiber
The testing sample that system rod etc. has a structure substantially symmetrical about its central axis and refractive index is distributed axisymmetricly is installed
In described fine adjustment stage, by the position of fine adjustment stage regulation testing sample so that pump
Pu light becomes first with the central shaft of described testing sample, and to preset angle incident and treat described in focusing on
On the default tested point of test sample product, detect the light central shaft also with described testing sample simultaneously and become
Second presets angle incidence and also focuses on described default tested point.Wherein, first preset
Mitre joint is bordering on or equal to 90 degree, second preset angle also close to or be equal to 90 degree, example
As, the first size presetting angle is all higher than little equal to 85 degree with the second size presetting angle
In equal to 90 degree.At this point it is possible to think the entering of described pump light and described detection light approx
Penetrate direction all vertical and through the central shaft of described testing sample, it is possible to be effectively prevented from pumping
Light and detection light focal beam spot after repeatedly rolling over, reflecting are difficult to the problem overlapped, and, have meanwhile
It is beneficial to detector and receives complete signal hot spot.Therefore, this utility model embodiment provides
Photo-thermal weak absorbing test device have effectively achieved the refractive index such as optical fiber or preform
The test of the photo-thermal weak absorbing characteristic of the optical texture being distributed axisymmetricly, compensate for effectively
Existing photo-thermal weak absorbing test equipment cannot characterize the deficiency of this kind of absorbed performance.
Other feature and advantage of the present utility model will illustrate in description subsequently, and,
Partly become apparent from description, or by implementing this utility model embodiment
Understand.The purpose of this utility model and other advantages can be by the description write, rights
Structure specifically noted in claim and accompanying drawing realizes and obtains.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical side of the prior art
Case, will be briefly described the accompanying drawing used required in embodiment below, it is clear that
Ground, the accompanying drawing in describing below is only embodiments more of the present utility model, for ability
From the point of view of the those of ordinary skill of territory, on the premise of not paying creative work, it is also possible to according to
These accompanying drawings obtain other accompanying drawing.Shown in accompanying drawing, of the present utility model above-mentioned and
Its purpose, feature and advantage will become apparent from.Reference identical in whole accompanying drawings refers to
Show identical part.The most deliberately drawing accompanying drawing by actual size equal proportion scaling, emphasis exists
In illustrating purport of the present utility model.
Fig. 1 shows in the photo-thermal weak absorbing test device that this utility model embodiment provides and treats
Test sample product scheme of installation in fine adjustment stage；
Fig. 2 shows the A-A profile of Fig. 1 that this utility model embodiment provides；
Fig. 3 shows that the photo-thermal weak absorbing that this utility model embodiment provides tests the knot of device
Structure schematic diagram.
Wherein, reference is respectively as follows:
First light source 110；First expands Shaping Module 120；Secondary light source 210；Second expands
Bundle Shaping Module 220；Reflecting mirror 230；Fine adjustment stage 300；Testing sample 400；Center
Axle 410；Alignment monitoring modular 500；Detector 600；Filtration module 610；Opto-electronic conversion
Module 620；Signal analysis module 630.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to this utility model embodiment
In technical scheme carry out clear, complete description, it is clear that described embodiment is only
It is a part of embodiment of this utility model rather than whole embodiments.New based on this practicality
Embodiment in type, those of ordinary skill in the art are not under making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.
The optical material of existing test refractive index homogeneity distribution or the photo-thermal weak absorbing of film layer set
Standby, it is used for testing the optical textures such as optical fiber or preform that refractive index is distributed axisymmetricly
Time, the focal beam spot that can there is pump light and detection light is difficult to overlap and detecting devices reception
Less than the problem of complete signal hot spot, thus affect test result.Therefore, in order to improve
The problems referred to above, this utility model provides a kind of photo-thermal weak absorbing test device.
The photo-thermal weak absorbing test device that the present embodiment provides includes the first light source 110, second
Light source 210, fine adjustment stage 300 and detector 600.During use, by testing sample 400
It is positioned in described fine adjustment stage 300, as shown in Figure 1.Wherein, described testing sample is
Structure substantially symmetrical about its central axis, as in figure 2 it is shown, described testing sample with described central shaft 410
Vertical cross section is circular, and the refractive index of described testing sample is distributed axisymmetricly.Such as,
Described testing sample can be the preform of optical fiber or cylinder.
Described first light source 110 is used for sending pump light, and described pump light is used for exciting to be measured
Sample generation thermal lensing effect.Described first light source 110 can be to send continuous laser beam
Light source, it is also possible to be the light source sending pulse laser beam.Described secondary light source 210 is for sending out
Going out and detect light, detection light is absorbed by testing sample can neglect relative to the absorption of pump light
Slightly, described detection light is for detecting the absorption in the region producing thermal lensing effect in testing sample
Characteristic, such as, described secondary light source 210 can use He-Ne laser instrument.
Described fine adjustment stage 300 is used for regulating the position of testing sample 400, so that described
Pump light becomes first preset angle incidence and focus on the central shaft 410 of described testing sample
On the default tested point of described testing sample 400, meanwhile, described detection light is to be measured with described
The central shaft 410 of sample becomes second preset angle incidence and focus on described default tested point
On.Wherein, described pump light and described detection light are all through the central shaft of described testing sample
410, the focal beam spot area of described detection light is more than the focal beam spot area of described pump light,
Described first presets mitre joint is bordering on or equal to 90 degree, second preset angle also close to or etc.
In 90 degree, such as, the first size presetting angle is all higher than with the second size presetting angle
Equal to 85 degree less than or equal to 90 degree, concrete, first presets angle and second presets angle
Can set according to the wavelength of the size of testing sample, the wavelength of pump light and detection light.
In the present embodiment, the incident direction of the detection light sent by secondary light source 210 is set as
X-direction, sets up three-dimensional cartesian coordinate system according to described X-direction.Fine adjustment stage 300
For sextuple fine adjustment stage 300, testing sample is arranged in described fine adjustment stage 300, adjusts
Joint fine adjustment stage 300 is possible not only to so that testing sample is along the X-axis of described fine adjustment stage 300
Translate in direction, Y direction and Z-direction, it is also possible to make testing sample flat with fine setting
Centered by the Y-axis of platform 300, axle 410 does 360 degree of rotations and makes testing sample flat towards fine setting
The X-axis of platform 300 and Z-direction are done pitching and are moved.Described detector 600 for receive by
The detection light obtain described testing sample according to received detection light of testing sample outgoing
Absorption to described pump light.It should be noted that in order to ensure that measuring optical fiber equidimension exists
Measuring accuracy during micron-sized testing sample, the regulation step-length of fine adjustment stage 300 also should reach
To micron dimension.
Preset at tested point when described pump light and described detection light all focus on testing sample
Time, focus on testing sample and preset the pump light at tested point by testing sample absorption initiation heat
At lens effect, i.e. pump light focal beam spot region, the refractive index of testing sample changes,
Thus will cause detecting light and be distorted through this region wavefront, such as increase newly and assemble or send out
Dissipate effect, produce some diffraction common path interference effect, and some diffraction common path interference effect further
Testing sample at phase shift and pump light focal beam spot region of interfering the absorbance of pump light is had
Close.Therefore, by detector 600 detect by testing sample outgoing detection light light intensity divide
Cloth, and can be obtained by the testing sample absorbance to pump light after carrying out data analysis.
Such as, described testing sample is optical fiber, when inside of optical fibre to be tested is a certain default to be measured
During absorption characteristic at Dian, the position of optical fiber can be regulated by fine adjustment stage 300 so that
Described pump light and described detection light all focus at the described default tested point in optical fiber, this
Time, detector 600 can be obtained by the described default tested point of inside of optical fibre pumping
The absorbance of light.Additionally, due to generally continuous or quasi-continuous (Gao Zhongying) of fiber-optic transfer
Laser, therefore the first light source 110 of this photo-thermal weak absorbing device preferably employs to export and swashs continuously
The pump light source of light beam.
Therefore, the optics knot refractive index such as optical fiber or preform being distributed axisymmetricly
The test of the photo-thermal weak absorbing characteristic of structure, the photo-thermal weak absorbing that this utility model embodiment provides
The optical material of device and existing test refractive index homogeneity distribution or the photo-thermal weak absorbing of film layer
Equipment is compared, by regulation fine adjustment stage 300 so that pump light and described testing sample
Central shaft become first to preset angle incident and focus on the default tested point of described testing sample
On, simultaneously detection light also central shaft with described testing sample become second preset angle incident and
Also focus on described default tested point.Wherein, first preset mitre joint and be bordering on or equal to 90
Degree, second preset angle also close to or equal to 90 degree.At this point it is possible to think institute approx
State pump light the most vertical with the incident direction of described detection light and in described testing sample
Mandrel, this makes it possible to be effectively prevented from pump light and detection light occurs many in testing sample
Secondary folding, reflection cause focal beam spot to be difficult to the problem overlapped, and meanwhile, are also beneficial to detector
600 receive complete signal hot spot.Therefore, the photo-thermal that this utility model embodiment provides
It is axle pair that weak absorbing test device have effectively achieved the refractive index such as optical fiber or preform
Claim the test of the photo-thermal weak absorbing characteristic of the optical texture of distribution, effectively compensate for existing
Photo-thermal weak absorbing test equipment cannot characterize the deficiency of this kind of absorbed performance.
The preferred implementation of the present embodiment is: described pump light is coplanar with described detection light,
And this face is X/Y plane, the angle between described detection light and described pump light in the range of
4～6 degree, regulated the position of testing sample 400 by fine adjustment stage 300 so that described
One presets angle is less than or equal to 86 degree more than or equal to 84 degree, and described second to preset angle be 90
Degree, the most described detection light is vertical and incident through the central shaft of described testing sample, and institute
The central shaft 410 stating testing sample 400 also is located in X/Y plane, as shown in Figure 3.
Further, as it is shown on figure 3, in order to ensure described pump light and described testing sample
Central shaft become first to preset angle incident, the center of detection light and described testing sample simultaneously
Axle becomes second to preset angle incidence, the photo-thermal weak absorbing test that this utility model embodiment provides
Device also includes being directed at monitoring modular 500.Described alignment monitoring modular 500 is used for receiving
Cross the pump light of described testing sample and incide pump light on testing sample with assisted calibration
Direction, the pump light that described first light source 110 sends incides on testing sample, through institute
The pump light stating testing sample incides described alignment monitoring modular 500.Such as, described right
Quasi-monitoring modular 500 can be ccd image sensor or cmos image sensor.?
Setting a predeterminated position on alignment monitoring modular 500, described predeterminated position is pre-according to first
If the material behavior of angle and testing sample is arranged.After testing sample determines, described pre-
If position is determined by the concrete incident direction of pump light, can be by the center of described testing sample
Axle 410 is positioned at the central shaft 410 of X/Y plane and described pump light and described testing sample
Become first when presetting angle incidence, received by alignment monitoring modular 500 from described to be measured
The facula position of the pump light of sample outgoing is set as predeterminated position.Hereafter, when described to be measured
The central shaft 410 of sample is not in X/Y plane or the incident direction of described pump light
When not becoming first to preset angle with the central shaft 410 of described testing sample, it is directed at monitoring modular
The facula position from the pump light of described testing sample outgoing received by 500 will deviate from pre-
If position.Therefore, it can the light according to the pump light detected by alignment monitoring modular 500
Speckle position, regulation fine adjustment stage 300 changes the position of testing sample, it is possible to make described
The central shaft 410 of testing sample is positioned at X/Y plane and described pump light and treats test sample with described
The central shaft 410 of product becomes first to preset angle incidence.
It should be noted that the pump light sent due to the first light source 110 and secondary light source 210
Angle between the detection light sent is less and is respectively positioned on X/Y plane, therefore, only needs to ensure
The central shaft 410 of described testing sample is positioned at X/Y plane and pump light and treats test sample with described
The central shaft of product becomes first, and to preset angle incident, it is possible to approximation think detection just with institute
The central shaft stating testing sample becomes second to preset angle incidence.
Additionally, in order to ensure to focus on the spot size on the default tested point of testing sample,
Make a diameter of 0.1 μm～1 μm of the focal beam spot of pump light, the focal beam spot of detection light
A diameter of 1 μm～10 μm.As it is shown on figure 3, described first light source 110 treats test sample with described
Being provided with first between product and expand Shaping Module 120, described secondary light source 210 is treated with described
It is provided with second between test sample product and expands Shaping Module 220.Described first light source 110 sends
Pump light through described first expand Shaping Module 120 shaping convergence process after focus on
The default tested point of described testing sample；The detection light that described secondary light source 210 sends passes through
The described second shaping convergence expanding Shaping Module 220 focuses on described testing sample after processing
Default tested point.Described first expands Shaping Module 120 can be made up of collecting lens group,
Again focus on after the pump light that the first light source 110 sends is expanded so that focus on and treat
It is 0.1 μm-1 μm that test sample product preset the spot diameter of the pump light of tested point.Described second expands
Bundle Shaping Module 220 can also be made up of collecting lens group, for by secondary light source 210
The detection light gone out focuses on after expanding again so that focuses on testing sample and presets the spy of tested point
The spot diameter of light-metering is 1 μm～10 μm.
Further, in order to optimize the space structure of device, it is ensured that each building block reasonable
Layout, described photo-thermal weak absorbing device also includes that reflecting mirror 230, described reflecting mirror 230 set
It is placed in described second to expand between Shaping Module 220 and described testing sample.Described reflecting mirror
230 for expanding the detection luminous reflectance of Shaping Module 220 shaping convergence to institute through second
State and focus on the default tested point of testing sample.
In this utility model embodiment, described detector 600 can include filtration module 610,
Photoelectric conversion module 620 and signal analysis module 630, described filtration module 610, described light
Electricity modular converter 620 and described signal analysis module 630 couple successively.Through described to be measured
The detection light of sample enters described light after sequentially passing through the Filtering Processing of described filtration module 610
Electricity modular converter 620, is converted to the signal of telecommunication through described photoelectric conversion module 620 and is sent to
Described signal analysis module 630, the described signal of telecommunication is detected by signal analysis module 630
And testing result is carried out data analysis, i.e. can obtain at the default tested point of testing sample
Absorption characteristic to pump light.
Wherein, described filtration module 610 can include collecting lens and diaphragm, it is preferred that
Described diaphragm can be arranged on the focal plane of described collecting lens.Photoelectric conversion module 620
Including photodetector 600, for incident detection optical signal is converted to the signal of telecommunication.
Signal analysis module 630 is for detecting the signal of telecommunication of photoelectric conversion module output and dividing
Analysis.Variable quantity due to the detection optical transmission characteristics that the thermal lensing effect of pump light initiation causes
Smaller, in some instances it may even be possible to less than the noise fluctuations of detection light itself, therefore, described signal divides
Analysis module 630 includes exchanging Infirmness signal detecting circuit, such as, described exchange Testing of Feeble Signals
Circuit can be lock-in amplifier, Boxcar integrator etc..
Additionally, be contaminated with in order to avoid inciding in the detection light in photoelectric conversion module 620
Other veiling glares in addition to detection light, described detector 600 can also include filtration module.
Described filtration module is arranged between described testing sample and described filtration module 610, is used for
Filter by the veiling glare in addition to detection light of testing sample outgoing, such as, described optical filtering mould
Block can include the optical filter that centre wavelength is consistent with detection optical wavelength.
The photo-thermal weak absorbing device that this utility model embodiment provides has body and absorbs one-dimensional point survey
Die trial formula, body absorb two-dimensional surface test pattern and body absorbs three-dimensional test pattern.Wherein, body
Absorb one-dimensional point test pattern for testing at the default tested point of testing sample pump light
Absorb result；Body absorbs two-dimensional surface test pattern for testing the given cross-sectional pair of testing sample
The absorption result of pump light, wherein, described given cross-sectional be testing sample and testing sample
The vertical cross section of central shaft 410；Body absorbs three-dimensional test pattern and is used for testing testing sample
Interval predeterminable range two given cross-sectional between the region absorption result to pump light.
Under Absorption in vivo one-dimensional point test pattern, described photo-thermal weak absorbing device to test optical fiber or
Light at the default tested point of the testing sample that the refractive indexs such as preform are distributed axisymmetricly
The concrete steps of hot weak absorbing characteristic include:
Testing sample is arranged in fine adjustment stage 300, and guarantees in testing sample as far as possible
Mandrel 410 direction is consistent with the Y direction of fine adjustment stage 300；In conjunction with alignment monitoring modular
The facula position of the pump light detected on 500, treats test sample by fine adjustment stage 300 regulation
The position of product, the central shaft 410 of described testing sample is positioned at X/Y plane, and described pump
The incident direction of Pu light becomes first to preset angle, described spy with the central shaft of described testing sample
The incident direction of light-metering is perpendicular to the central shaft of described testing sample, and makes pump light and spy
Light-metering all focuses at the default tested point of testing sample；Now, the signal of detector 600
The output analyzing module 630 is the testing sample suction to pump light at described default tested point
Receipts value.
Under Absorption in vivo two-dimensional surface test pattern, described photo-thermal weak absorbing device to test optical fiber or
Photo-thermal at the given cross-sectional of the testing sample that the refractive indexs such as preform are distributed axisymmetricly
The concrete steps of weak absorbing characteristic include:
Testing sample is arranged in fine adjustment stage 300, and guarantees in testing sample as far as possible
Mandrel 410 direction is consistent with the Y direction of fine adjustment stage 300；In conjunction with alignment monitoring modular
The facula position of the pump light detected on 500, treats test sample by fine adjustment stage 300 regulation
The position of product, it is ensured that the central shaft 410 of described testing sample is positioned at X/Y plane, and institute
The central shaft of the incident direction and described testing sample of stating pump light becomes first to preset angle, institute
The incident direction stating detection light is perpendicular to the central shaft of described testing sample, and makes pump light
All focus on the first of testing sample preset at tested point with detection light, wherein said first pre-
If tested point is positioned at center or the edge of given cross-sectional, the signal analysis module of detector 600
630 record first presets the testing sample absorption value to described pump light at tested point.This reality
With in new embodiment, the zero point that the central point of given cross-sectional is set as in X-direction,
And set described first and preset tested point and be positioned at the edge of given cross-sectional, regulate fine adjustment stage
300 make testing sample preset the rotary step central shaft round described testing sample with first
410 rotate a circle, and i.e. can obtain the annulus being X1 with center of circle distance on given cross-sectional successively
On the absorption data of multiple default tested point.Continue regulation fine adjustment stage 300 to make to treat test sample
Product move first along the X-direction of fine adjustment stage 300 and preset translating step Δ X, regulate micro-
Leveling platform 300 makes testing sample preset rotary step round described testing sample with second
Central shaft 410 rotates a circle, and i.e. can obtain successively on given cross-sectional with center of circle distance is X2
Annulus on the absorption data of multiple default tested point, wherein X1-X2=Δ X；Class successively
Push away, until Xn=0.It is to say, given cross-sectional is segmented into n donut, obtain
The absorption data of n donut, it is possible to reflect the suction to pump light of the whole given cross-sectional
Receive result.Preset tested point be positioned at described given cross-sectional it is of course also possible to set described first
Center.
Wherein, first to preset translating step Δ X be a definite value, can be according to pump light
The diameter of focal beam spot determines；Owing to the radius of n donut all differs, excellent
Choosing, in order to ensure that body absorbs the measuring accuracy of two-dimensional surface test pattern, first presets rotation
Step-length, second preset rotary step ... N presets rotary step and all differs, concrete
The default rotary step of each annulus is according to the body required for the size of given cross-sectional, user
The radius of the measuring accuracy and annulus that absorb two-dimensional surface test pattern sets.For example, it is possible to
Body required for size according to given cross-sectional and user absorbs the survey of two-dimensional surface test pattern
Default rotary step is set to a function about X by examination precision so that Δ θ=kX, its
In, Δ θ is to obtain the suction being the multiple default tested point on the annulus of X with center of circle distance
The default rotary step of testing sample when receiving data, k is proportionality coefficient, the concrete numerical value root of k
The test of two-dimensional surface test pattern is absorbed according to the body required for the size of given cross-sectional and user
Precision set.
It should be noted that body absorbs under two-dimensional surface test pattern, for fine adjustment stage 300
Regulation, including the translational adjustment in X-direction and around Y direction rotation regulate,
Both regulative modes can be the vernier knob manually regulating fine adjustment stage 300, also
Can be being to be automatically adjusted mode.The detailed description of the invention being wherein automatically adjusted mode is: arrange
First drives module and second to drive module, drives module and fine adjustment stage 300 by first
X-direction translation vernier knob connects, by the second use driving module and fine adjustment stage 300
The vernier knob rotated around Y direction in regulation connects.And then driven first by host computer
Dynamic model block and second drive module be controlled, it is possible to realize to fine adjustment stage 300 from
Dynamic regulation.Such as, first drives module and second to drive module to may each comprise motor,
And the step-length of described motor reaches micron dimension.
Additionally, it is on the basis of Absorption in vivo two-dimensional surface is tested that body absorbs three-dimensional test pattern,
Increase testing sample in the movement of Y-axis, will two of interval predeterminable range of testing sample
Region between given cross-sectional is divided into multiple cross section to be measured being perpendicular to described central shaft, successively
Test each section testing sample to be measured absorption data to pump light, the most each to be measured
After cross sectional testing completes, regulation fine adjustment stage 300 makes testing sample preset translation with second
Step delta Y moves along the Y direction of fine adjustment stage 300, repeats aforesaid operations, respectively
Obtain the above-mentioned multiple section testing sample to be measured absorption data to pump light, can obtain
The testing sample absorbing state to pump light in region between two given cross-sectional.Wherein,
Second presets translating step can be arranged according to the diameter of the focal beam spot of pump light.
It should be noted that body absorbs under three-dimensional test pattern, for fine adjustment stage 300
Regulation, including the translational adjustment in X-direction, around Y direction rotation regulate and
Translational adjustment in Y direction.I.e. absorb two-dimensional surface test pattern relative to body and increase Y newly
Translational adjustment on direction of principal axis.Similar with other two kinds of regulative modes, fine adjustment stage 300 exists
The implementation of the translational adjustment in Y direction can be manually to regulate fine adjustment stage
The vernier knob of 300 realizes, it is also possible to realize by being automatically adjusted mode.The most automatically adjust
The detailed description of the invention of joint mode is: arrange the 3rd driving module, by the 3rd drive module with
The Y direction translation vernier knob of fine adjustment stage 300 connects.And then by host computer to the
Three drive module to be controlled, it is possible to realize fine adjustment stage 300 and translate in the Y-axis direction
Be automatically adjusted.Wherein, the 3rd module is driven can also to include motor, and described step
The step-length entering motor reaches micron dimension.
It should be noted that in this article, the relational terms of such as first and second or the like
It is used merely to separate an entity or operation with another entity or operating space, and not
Necessarily require or imply these entities or operation between exist any this reality relation or
Person's order.And, term " includes ", " comprising " or its any other variant are intended to
Comprising of nonexcludability so that include the process of a series of key element, method, article or
Person's equipment not only includes those key elements, but also includes other key elements being not expressly set out,
Or also include the key element intrinsic for this process, method, article or equipment.?
In the case of there is no more restriction, statement " including ... " key element limited, not
Eliminating there is also other in including the process of described key element, method, article or equipment
Identical element.
The above, detailed description of the invention the most of the present utility model, but of the present utility model
Protection domain is not limited thereto, and any those familiar with the art is in this practicality
In the technical scope of novel exposure, change can be readily occurred in or replace, all should contain in this reality
Within novel protection domain.Therefore, protection domain of the present utility model should be described with power
The protection domain that profit requires is as the criterion.
Claims (10)
1. a photo-thermal weak absorbing test device, it is characterised in that including: the first light source,
Secondary light source, fine adjustment stage and detector, testing sample is positioned in described fine adjustment stage,
Axially symmetric structure centered by described testing sample, the refractive index of described testing sample is axisymmetricly
Distribution；The pump light that described first light source sends is through the central shaft of described testing sample and poly-
The burnt default tested point to described testing sample, the detection light also warp that described secondary light source sends
Cross the central shaft of described testing sample and focus on described default tested point, described detection light
Focal beam spot area is more than the focal beam spot area of described pump light, through described testing sample
Detection light be incident to described detector.
Photo-thermal weak absorbing the most according to claim 1 test device, it is characterised in that
The pump light that described first light source sends becomes first to preset folder with the central shaft of described testing sample
Angle is incident, and the detection light that described secondary light source sends becomes the with the central shaft of described testing sample
Two preset angle incidence, and the described first size and described second presetting angle presets angle
Size is all higher than equal to 85 degree less than or equal to 90 degree.
Photo-thermal weak absorbing the most according to claim 1 and 2 test device, its feature exists
In, also include inciding with assisted calibration through the pump light of described testing sample for reception
The alignment monitoring modular in the direction of the pump light on testing sample, described first light source sends
Pump light incides on described testing sample, and the pump light through described testing sample incides
Described alignment monitoring modular.
Photo-thermal weak absorbing the most according to claim 3 test device, it is characterised in that
It is provided with for described pump light is focused between described first light source and described testing sample
The first of the default tested point of described testing sample expands Shaping Module, described secondary light source with
It is provided with between described testing sample for described detection light is focused on described testing sample
Preset tested point second expands Shaping Module；The pump light that described first light source sends passes through
The described first shaping convergence expanding Shaping Module focuses on the pre-of described testing sample after processing
If tested point；The detection light that described secondary light source sends expands Shaping Module through described second
Shaping convergence process after focus on the default tested point of described testing sample.
Photo-thermal weak absorbing the most according to claim 4 test device, it is characterised in that
Also include for the detection luminous reflectance after Shaping Module shaping is assembled will be expanded to institute through second
Stating the reflecting mirror focused on the default tested point of testing sample, described reflecting mirror is arranged at described
Second expands between Shaping Module and described testing sample.
Photo-thermal weak absorbing the most according to claim 5 test device, it is characterised in that
Described detector includes filtration module, photoelectric conversion module and signal analysis module, described filter
Mode block, described photoelectric conversion module and described signal analysis module couple, successively through institute
The detection light stating testing sample enters described photoelectricity after the Filtering Processing of described filtration module
Modular converter, is converted to the signal of telecommunication through described photoelectric conversion module and is sent to described signal and divides
Analysis module.
Photo-thermal weak absorbing the most according to claim 6 test device, it is characterised in that
Described filtration module includes collecting lens and diaphragm, by the detection light of described testing sample outgoing,
Described photoelectric conversion module is incided after sequentially passing through described collecting lens and described diaphragm.
Photo-thermal weak absorbing the most according to claim 7 test device, it is characterised in that
Described detector also include filtration module, described filtration module be arranged at described testing sample and
Between described filtration module.
Photo-thermal weak absorbing the most according to claim 8 test device, it is characterised in that
Described first light source is the pump light source for exporting continuous laser beam.
Photo-thermal weak absorbing the most according to claim 9 test device, it is characterised in that
Described secondary light source is He-Ne laser instrument.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620117076.7U CN205538713U (en) | 2016-02-05 | 2016-02-05 | Light and heat weak absorption testing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620117076.7U CN205538713U (en) | 2016-02-05 | 2016-02-05 | Light and heat weak absorption testing arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717127A (en) * | 2016-02-05 | 2016-06-29 | 中国工程物理研究院激光聚变研究中心 | Photo-thermal weak absorption testing device and method |
| 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 |
-
2016
- 2016-02-05 CN CN201620117076.7U patent/CN205538713U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105717127A (en) * | 2016-02-05 | 2016-06-29 | 中国工程物理研究院激光聚变研究中心 | Photo-thermal weak absorption testing device and method |
| 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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