CN102818788A - Device and method for detecting residual reflection of neodymium glass wrapping - Google Patents
Device and method for detecting residual reflection of neodymium glass wrapping Download PDFInfo
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- CN102818788A CN102818788A CN2012102621430A CN201210262143A CN102818788A CN 102818788 A CN102818788 A CN 102818788A CN 2012102621430 A CN2012102621430 A CN 2012102621430A CN 201210262143 A CN201210262143 A CN 201210262143A CN 102818788 A CN102818788 A CN 102818788A
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Abstract
The invention provides a device and method for detecting the residual reflection of a neodymium glass wrapping. The device comprises a first laser; a light beam shaping lens group, a beam splitter and a sample are arranged in sequence along the laser output direction of the laser; a laser intensity detector is arranged in the reflected light direction of the beam splitter; a residual reflection light detector is arranged in the wrapping residual reflected light direction of the sample; and the output end of the laser intensity detector and the residual reflected light detector are connected with the input end of a data processing system. The device and the method have the following characteristics of simple structure, convenience in use and high measuring precision.
Description
Technical field
The present invention relates to the neodymium glass detection technique, especially a kind of neodymium glass bound edge residual reflection pick-up unit and detection method.
Background technology
Neodymium glass is used very extensive as laser material, it is big to have absorption spectrum ranges, and absorption coefficient is big, and fluorescence lifetime is high, and stimulated emission cross section is big, and is four-level system, has good spectrum property, is suitable as very much laser material.Neodymium glass has the melting technology of good maturation; Can make the product of all size size; Particularly the oversize neodymium glass is the amplification medium of the mature and reliable of high power laser system at present; Be widely used in various in the world device of high power laser, the national portfire of the U.S. for example, the refreshing light engineering of China etc.Neodymium glass is excited spontaneous radiation (being called for short ASE) can have a strong impact on gain amplifier when amplifying actuating medium, reduces and amplifies efficient, increases the laser aid cost.Other four sides of neodymium glass being removed logical light face connect the glass that absorbs optical maser wavelength through the mode of gluing together, and destroy neodymium glass ASE amplification process, are called the neodymium glass bound edge.Through the neodymium glass bound edge, can greatly reduce the influence of neodymium glass ASE to gain amplifier, eliminate the ASE influence basically.In the neodymium glass bound edge, the refractive index match degree is to influence the key that the neodymium glass bound edge reduces ASE between neodymium glass, cementing layer and the bound edge glass, weighs the most important parameters of neodymium glass bound edge quality.
The refractive index match degree of accurately measuring the neodymium glass bound edge is particularly important to accurate evaluation neodymium glass bound edge quality.Also do not estimate at present the patent of neodymium glass bound edge refractive index match degree; The present invention is according to the Fresnel law; Proposition characterizes neodymium glass bound edge refractive index match degree through measuring neodymium glass and cementing layer boundary reflection and bound edge glass and cementing layer boundary reflection synthesis result, and wherein neodymium glass and cementing layer boundary reflection and bound edge glass and cementing layer boundary reflection summation are called the residual reflection of neodymium glass bound edge.Can directly, objectively reflect neodymium glass bound edge refractive index match degree through measuring the residual reflection of neodymium glass bound edge, quantitative evaluation neodymium glass bound edge quality has extremely important meaning.
Summary of the invention
Technical matters to be solved by this invention provides the pick-up unit and the detection method of a kind of high-acruracy survey neodymium glass bound edge residual reflection.This device should have simple in structure, and is easy to use, and measuring accuracy is high, the characteristics that cost is low.
The present invention solves the problems of the technologies described above the technical scheme that is adopted:
Bound edge neodymium glass to be measured is made up of neodymium glass, cementing layer, bound edge glass three parts, and wherein neodymium glass is made the isosceles triangle piece, and below we abbreviate sample as.
A kind of pick-up unit of neodymium glass bound edge residual reflectance; Characteristics are that this device comprises first laser instrument; Be beam shaping lens group, spectroscope, sample successively, be the laser intensity detector along the output laser direction of this laser instrument in spectroscopical reflected light direction; Bound edge residual reflection light direction at described sample is provided with the residual reflection photo-detector; The input end of the output termination data handling system of described laser intensity detector and residual reflection photo-detector; Described beam shaping lens group and beam splitter all are installed on the adjustment rack that can level rotates with pitching, and described sample is installed on the sample stage of can level rotating arbitrarily, and this platform can carry out pitching and horizontal adjustment.
Between described first laser instrument and beam shaping lens group, be provided with and become 45 ° total reflective mirror socket with light path, supply plugging of total reflective mirror, measure with the laser of introducing other long wavelength laser.
Described sample is made up of neodymium glass, cementing layer and bound edge glass, and wherein neodymium glass is processed into the isoceles triangle piece, and two base angles equate; The base angle is a neodymium glass bound edge residual reflection incident angle; Two central planes such as grade all polish, and more than the smooth finish P IV level, aperture is generally less than 200 microns less than the 0.5. cementing layer; The bound edge thickness of glass is less than 20mm, and neodymium glass and bound edge glass are closely linked through cementing layer.
Said laser intensity detector and residual reflection detector are point probe; And sensitivity of laser intensity explorer response and laser instrument output laser intensity coupling; Sensitivity of residual reflection explorer response and neodymium glass bound edge residual reflection intensity are complementary, and ratio between two generally is not more than 10
-4
Use the detection method of described pick-up unit to the neodymium glass residual reflectance, its characteristics are that it may further comprise the steps:
1. regulate first laser instrument, beam shaping lens group, spectroscope, laser intensity detector and residual reflection detector, make laser beam be positioned at their center and coaxial;
2. adjust the beam shaping lens group, reduce the laser output angle of divergence;
3. start first laser instrument, make output laser keep stable;
4. adjust sample position, make laser vertical incide the isosceles limit of isosceles triangle sample, making the incident angle that incides the bound edge interface is base angle θ;
5. begin to measure, read the energy value E1 and the E2 of laser intensity detector (7) and residual reflection detector (9);
6. utilize formula to calculate residual reflectance R (θ):
Wherein: R is that reflectivity
n that impinges perpendicularly on neodymium glass surface is the neodymium glass refractive index, and s is the beam splitter splitting ratio.
The bound edge neodymium glass corner block of isosceles triangle that has the base angle of incident angle through processing is to measure the bound edge residual reflectance of different incidence angles.
Described laser source wavelength be 400nm between the 1100nm, the continuous or pulse of mode of operation all can.
Described sample is made up of neodymium glass, cementing layer, bound edge glass three parts, and wherein neodymium glass is made the isoceles triangle piece, and drift angle faces and is the bound edge face.
The invention has the advantages that:
1, adopt bifocal path structure can effectively reduce the influence that fluctuation of energy brings;
2, sample designs according to actual conditions, can measure different angles, the neodymium glass bound edge residual reflection of different cementing layers and different bound edge glass;
3, have total reflective mirror and insert mechanism, can introduce other long wavelength laser and measure;
4, device response sensitivity height is surveyed in residual reflection, and laser instrument output energy is high, therefore can the small neodymium glass bound edge residual reflection of high-acruracy survey.
5, adopt data handling system, can fast automatic measurement, reduce personal error.
6, this apparatus structure is simple, and is easy to use, and cost is low, very practical.
Description of drawings
Fig. 1 is the structural representation of pick-up unit of the present invention.
Fig. 2 is a sample structure synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further to set forth in detail, but should not limit protection scope of the present invention with this.
As shown in Figure 1; Neodymium glass bound edge residual reflectance pick-up unit of the present invention comprises first laser instrument 1, other long wavelength laser 2, total reflective mirror 3, beam shaping lens group 4, spectroscope 5, sample 6, laser intensity detector 7, data handling system 8 and residual reflection detector 9.Wherein other long wavelength laser 2 and the signal of total reflective mirror 3 with dashed lines show that these two parts do not need at ordinary times, add when needing.Sample 6 is as shown in Figure 2, comprises neodymium glass A, cementing layer B and bound edge glass C, and neodymium glass and bound edge glass interconnect through cementing layer.Sample 6 be placed on can the anglec of rotation and can about on the sample stage of regulating with pitch rotation, laser intensity detector 7 all is connected with data handling system 8 with residual reflection detector 9.
Below in conjunction with Fig. 1, carry out concrete the introduction as follows of method that the residual reflection of neodymium glass bound edge detects to using above-mentioned detection device:
First laser instrument, 1 common wavelength is 1053nm, single or repetition all can, introduce through total reflective mirror 3 like other long wavelength laser of need 2.Laser intensity detector 7 response sensitivities and laser instrument 1 output laser intensity coupling, the sensitivity of residual reflection detector 9 and neodymium glass bound edge residual reflection strength matching, ratio between two generally is not more than 10
-4, preferably reach 10
-6Even 10
-7 Spectroscope 5 splitting ratios preferably are not less than 1:9, guarantee the incident light of most laser as the residual reflection of neodymium glass bound edge.The photosensitive region of laser intensity detector 7 and residual reflection detector 9 should be greater than laser instrument output light field diameter, and laser intensity detector 7 must the response optical maser wavelengths with residual reflection detector 9.First laser instrument 1 is through after 4 shapings of beam shaping lens group, and laser beam divergence is in 10mrad.Use the detection method of described pick-up unit, may further comprise the steps the neodymium glass residual reflectance:
1. regulate first laser instrument, beam shaping lens group, spectroscope, laser intensity detector and residual reflection detector, make laser beam be positioned at their center and coaxial;
2. adjust the beam shaping lens group, reduce the laser output angle of divergence;
3. start first laser instrument, preheating was measured through laser intensity detector 7 after 30 minutes, and the output of inspection laser makes output laser keep stable;
4. adjust sample position, make laser vertical incide the isosceles limit of isosceles triangle sample, making the incident angle that incides the bound edge interface is base angle θ;
5. begin to measure, read the energy value E1 and the E2 of laser intensity detector (7) and residual reflection detector (9), the signal that detects on laser intensity detector 7 and the residual reflection detector 9 is sent into data handling system 8;
6. data handling system 8 utilizes formula to calculate residual reflectance R (θ):
Wherein: R is that reflectivity
n that impinges perpendicularly on neodymium glass surface is the neodymium glass refractive index, and s is the beam splitter splitting ratio.
Change other long wavelength laser 2, in measuring light path, put into total reflective mirror 3 laser instrument 2 is introduced, repeat above-mentioned steps, the neodymium glass bound edge residual reflection that can measure different wave length laser;
The residual reflection of neodymium glass bound edge can characterize with different incidence angles, and the present invention takes into full account actual conditions, with the base angle θ incident angle processing as required of sample 6, measures the neodymium glass bound edge residual reflection that needing can obtain incident angle then.
Experiment shows, the characteristics that the present invention has is simple in structure, easy to use, measuring accuracy is high.
Claims (6)
1. the pick-up unit of a neodymium glass bound edge residual reflectance; Be characterised in that this device comprises first laser instrument (1); Be beam shaping lens group (4), spectroscope (5), sample (6) successively, be laser intensity detector (7), residual reflection photo-detector (9) be set along the output laser direction of this laser instrument at the bound edge residual reflection light direction of described sample (6) in the reflected light direction of spectroscope (5); The input end of the output termination data handling system (8) of described laser intensity detector (7) and residual reflection photo-detector (9); Described beam shaping lens group and beam splitter all be installed in can level and the adjustment rack that rotates of pitching on; Described sample is installed in can level arbitrarily on the sample stage of rotation, and this platform can carry out pitching and horizontal adjustment.
2. the pick-up unit of neodymium glass bound edge residual reflectance according to claim 1; It is characterized in that; Between described first laser instrument (1) and beam shaping lens group (4), be provided with and become 45 ° total reflective mirror socket with light path; Supply plugging of total reflective mirror (3), measure with the laser of introducing other long wavelength laser (2).
3. the pick-up unit of neodymium glass bound edge according to claim 1 residual reflection is characterized in that described sample is made up of neodymium glass, cementing layer and bound edge glass, and wherein neodymium glass is processed into the isoceles triangle piece; Two base angles equate that the base angle is a neodymium glass bound edge residual reflection incident angle, and two central planes such as grade all polish; More than the smooth finish P IV level; Aperture is generally less than 200 microns less than the 0.5. cementing layer, and the bound edge thickness of glass is less than 20mm, and neodymium glass and bound edge glass are closely linked through cementing layer.
4. the pick-up unit of neodymium glass bound edge according to claim 1 residual reflection; It is characterized in that said laser intensity detector and residual reflection detector are point probe; And sensitivity of laser intensity explorer response and laser instrument output laser intensity coupling; Sensitivity of residual reflection explorer response and neodymium glass bound edge residual reflection intensity are complementary, and ratio between two generally is not more than 10
-4
5. use the detection method of the described pick-up unit of claim 1, it is characterized in that it may further comprise the steps the neodymium glass residual reflectance:
1. regulate first laser instrument, beam shaping lens group, spectroscope, laser intensity detector and residual reflection detector, make laser beam be positioned at their center and coaxial;
2. adjust the beam shaping lens group, reduce the laser output angle of divergence;
3. start first laser instrument, make output laser keep stable;
4. adjust sample position, make laser vertical incide the isosceles limit of isosceles triangle sample, making the incident angle that incides the bound edge interface is base angle θ;
5. begin to measure, read the energy value E1 and the E2 of laser intensity detector (7) and residual reflection detector (9);
6. utilize formula to calculate residual reflectance R (θ):
Wherein: R is that reflectivity
n that impinges perpendicularly on neodymium glass surface is the neodymium glass refractive index, and s is the beam splitter splitting ratio.
6. the detection method of neodymium glass bound edge according to claim 5 residual reflection is characterized in that having through processing the bound edge neodymium glass corner block of isosceles triangle at the base angle of incident angle, to measure the bound edge residual reflectance of different incidence angles.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308487A (en) * | 2013-06-14 | 2013-09-18 | 合肥知常光电科技有限公司 | Method and device for measuring residual reflection of edge covering interface of optical gain medium |
| CN103335951A (en) * | 2013-07-01 | 2013-10-02 | 成都精密光学工程研究中心 | System for measuring Terahertz reflectance of stealth material |
| CN103698302A (en) * | 2013-12-30 | 2014-04-02 | 合肥知常光电科技有限公司 | Multi-angle and multi-point measuring device and method of laser gain medium cladding residual reflection |
| CN103712950A (en) * | 2013-12-30 | 2014-04-09 | 合肥知常光电科技有限公司 | Apparatus and method for measuring large-caliber laser glass residual reflectance after edge cladding |
| CN107884368A (en) * | 2017-10-18 | 2018-04-06 | 湖南文理学院 | A kind of optic testing system and method for testing |
| CN108700511A (en) * | 2015-12-28 | 2018-10-23 | 折原制作所有限公司 | Surface refractive index assay method and the surface stress assay method that this method is utilized |
| CN108885088A (en) * | 2016-04-08 | 2018-11-23 | 株式会社斯库林集团 | Basal surface position detection device, image acquiring device, basal surface position detection method and image acquiring method |
| CN111307809A (en) * | 2020-02-24 | 2020-06-19 | 浙江大学 | Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308487B (en) * | 2013-06-14 | 2015-12-02 | 合肥知常光电科技有限公司 | The measuring method of optical gain medium bound edge interface residual reflection |
| CN103308487A (en) * | 2013-06-14 | 2013-09-18 | 合肥知常光电科技有限公司 | Method and device for measuring residual reflection of edge covering interface of optical gain medium |
| CN103335951A (en) * | 2013-07-01 | 2013-10-02 | 成都精密光学工程研究中心 | System for measuring Terahertz reflectance of stealth material |
| CN103335951B (en) * | 2013-07-01 | 2016-06-01 | 中国工程物理研究院激光聚变研究中心 | The measuring system of stealth material Terahertz reflectivity |
| CN103698302B (en) * | 2013-12-30 | 2016-03-02 | 合肥知常光电科技有限公司 | The multi-angle Multi point measuring apparatus of gain medium bound edge residual reflection and method |
| CN103712950B (en) * | 2013-12-30 | 2016-01-13 | 合肥知常光电科技有限公司 | The measurement mechanism of a kind of large-caliber laser glass edge-wrapping residual reflection and method |
| CN103712950A (en) * | 2013-12-30 | 2014-04-09 | 合肥知常光电科技有限公司 | Apparatus and method for measuring large-caliber laser glass residual reflectance after edge cladding |
| CN103698302A (en) * | 2013-12-30 | 2014-04-02 | 合肥知常光电科技有限公司 | Multi-angle and multi-point measuring device and method of laser gain medium cladding residual reflection |
| CN108700511A (en) * | 2015-12-28 | 2018-10-23 | 折原制作所有限公司 | Surface refractive index assay method and the surface stress assay method that this method is utilized |
| CN108700511B (en) * | 2015-12-28 | 2020-12-18 | 折原制作所有限公司 | Surface refractive index measuring method and surface stress measuring method using the same |
| CN108885088A (en) * | 2016-04-08 | 2018-11-23 | 株式会社斯库林集团 | Basal surface position detection device, image acquiring device, basal surface position detection method and image acquiring method |
| CN107884368A (en) * | 2017-10-18 | 2018-04-06 | 湖南文理学院 | A kind of optic testing system and method for testing |
| CN111307809A (en) * | 2020-02-24 | 2020-06-19 | 浙江大学 | Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method |
| CN111307809B (en) * | 2020-02-24 | 2021-01-12 | 浙江大学 | Small pipeline gas-liquid two-phase flow phase distribution optical detection system and method |
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