CN112504632B - Hot focal length measuring device based on interior focusing collimator - Google Patents
Hot focal length measuring device based on interior focusing collimator Download PDFInfo
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- CN112504632B CN112504632B CN202011235117.XA CN202011235117A CN112504632B CN 112504632 B CN112504632 B CN 112504632B CN 202011235117 A CN202011235117 A CN 202011235117A CN 112504632 B CN112504632 B CN 112504632B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention relates to a thermal focal length measuring device based on an internal focusing collimator, and belongs to the technical field of photoelectricity. One end of the laser working substance is provided with a reticle, and the other end is provided with an internal focusing collimator. When the laser working substance is not pumped, imaging the reticle by using the internal focusing collimator, and recording the focal length f1 of the internal focusing collimator at the moment; when the laser working substance is pumped, focusing is carried out on the internal focusing collimator, the reticle is imaged again, and the focal length f2 of the internal focusing collimator at the moment is recorded. According to the focal length difference of the focusing collimator tube before and after pumping and the distance between the reticle and the center of the laser working substance, the thermal focal length of the laser working substance can be calculated by an imaging formula. The invention uses the focusing characteristic of the internal focusing collimator to measure the thermal focus, has simple structure and convenient operation, and can be suitable for measuring the thermal focus of various working substances.
Description
Technical Field
The invention belongs to the technical field of photoelectricity, relates to a working substance thermal focal length measuring device in a laser, and particularly relates to a thermal focal length measuring device based on an internal focusing collimator.
Background
When a high-power laser works, a thermal lens effect is often formed by laser working substances due to uneven heat dissipation, so that the output power and the beam quality of the laser are reduced. Therefore, various measures are required to compensate for the thermal effect of the laser working substance, but a premise is that the thermal focal length of the laser working substance needs to be measured accurately. In the past thermal focal length measuring method, for example, a probe beam method needs to accurately measure the light spot change of a probe beam after passing through a laser working substance; the unstable flat cavity method needs to change the position of the cavity mirror continuously, has more testing steps and is complicated to debug. Therefore, it is necessary to design a thermal focal length measuring device with simple structure and convenient operation, and provide accurate thermal focal length value input for the design of a high-power laser.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a thermal focal length measuring device based on an internal focusing collimator.
Technical proposal
A thermal focus measuring device based on an internal focusing collimator is characterized in that: one end of the laser working substance is provided with a reticle, and the other end is provided with an internal focusing parallel light pipe capable of displaying the focal length value; the distance between the reticle and the center of the laser working substance is L1; adjusting the focal length of an internal focusing collimator to image a reticle placed at the other end of the laser working substance; when the pump source does not work, recording the focal length f1 of the internal focusing collimator when the reticle is imaged clearly; starting a pumping source to start working, focusing the internal focusing collimator, imaging the reticle again, and recording that the focal length of the internal focusing collimator is f2 at the moment; recording the focal length adjustment distance of the focusing collimator tube before and after the pump source works as deltax=f2-f 1; the focal length of a thermal lens of the laser working substance is recorded as f; according to the geometrical optical imaging principle, the relation between Deltax and f and L1 can be obtained, so that the thermal focal length f of the laser working substance can be obtained through settlement.
The technical scheme of the invention is as follows: the laser working substance can be a round laser bar, a square laser bar, a parallelogram laser bar and a trapezoid laser bar.
The technical scheme of the invention is as follows: the reticle may be a cross reticle or a star reticle.
The technical scheme of the invention is as follows: the internal focusing collimator can be manual focusing or electric focusing.
The technical scheme of the invention is as follows: the pump source may be a xenon lamp, a krypton lamp, or a semiconductor laser array.
Advantageous effects
The thermal focal length measuring device based on the internal focusing collimator provided by the invention has the advantages that the structure is simple, the operation is convenient, the thermal focal length of a laser working substance can be obtained only by using one reticle and the internal focusing collimator, and not only the radial thermal focal length but also the thermal focal length in the orthogonal direction can be measured.
Drawings
Fig. 1 is a structural view of a thermal focus measuring apparatus of the present invention, in which: 1-reticle, 2-laser working substance, 3-pumping source, 4-internal focusing collimator.
Fig. 2 is an optical path diagram for measuring a thermal focal length, wherein: 5-thermal lens, A0-reticle position, A1-A0 imaged by the laser working substance; A2-A0 passes through the position of the front half part of the laser working substance after imaging; A3-A0 sequentially passes through the front half part of the laser working substance and the position of the thermal lens after imaging; A4-A0 sequentially passes through the front half part of the laser working substance, the thermal lens and the imaging position of the rear half part of the laser working substance.
Detailed Description
The invention will now be further described with reference to examples, figures:
the invention relates to a thermal focal length measuring device based on an internal focusing collimator, which uses the internal focusing collimator to image a reticle arranged at the other end of a laser working substance when a pumping source does not work and works, and obtains the thermal focal length of the laser working substance through calculation of a geometric imaging relation. The specific implementation mode is as follows:
1, a reticle 1 is placed at one end of a laser working substance 2, and an internal focusing collimator 4 capable of displaying a focal length value is placed at the other end.
2, the distance of the reticle 1 from the center of the laser working substance 2 is L1.
3, adjusting the focal length of the internal focusing collimator 4, and imaging the reticle 1 placed at the other end of the laser working substance.
4, when the pump source 3 does not work, the focal length of the internal focusing collimator 4 when the imaging of the reticle 1 is clear is recorded as f1.
And 5, starting the pumping source 3 to start working, focusing the internal focusing collimator 4, imaging the reticle 1 again, and recording that the focal length of the internal focusing collimator 4 is f2.
And 6, recording the focal length adjustment distance of the focusing collimator 4 before and after the operation of the pump source 3 as deltax=f2-f 1. The focal length of the heating lens 5 is f.
From the geometrical optical imaging relationship in fig. 2, the following relationship can be obtained:
the distance between A2 and A0 is: d (1-1/n)/2, wherein n is the refractive index of the laser working substance 2 and d is the length of the laser working substance 2;
the distance between A1 and the inner focusing collimator 4 is as follows: f1;
the distance between A1 and A0 is: d (1-1/n);
the distance between A3 and A4 is: d (1-1/n)/2;
the distance between A4 and the inner focusing collimator (4) is as follows: f2.
8, the following relationship can be obtained from the conjugate points of A2 and A3 in FIG. 2 with respect to the thermal lens 5: 1/[ L1-d (1-1/n)/2 ] -1/[ L1-d (1-1/n)/2+Δx ] =1/f.
Thus, a thermal focal length calculation formula can be obtained:
f＝[L1-d(1-1/n)/2]·[L1-d(1-1/n)/2+Δx]/Δx
the laser working substance can be a round laser bar, a square laser bar, a parallelogram laser bar and a trapezoid laser bar.
The reticles described above may be cross reticles and star reticles.
The internal focusing collimator can be manual focusing or electric focusing.
The pump sources described above may be xenon lamps, krypton lamps, and semiconductor laser arrays.
Claims (1)
1. A thermal focus measuring device based on an internal focusing collimator is characterized in that: one end of the laser working substance is provided with a reticle, and the other end is provided with an internal focusing parallel light pipe capable of displaying the focal length value; the distance between the reticle and the center of the laser working substance is L1; adjusting the focal length of an internal focusing collimator to image a reticle placed at the other end of the laser working substance; when the pump source does not work, recording the focal length f1 of the internal focusing collimator when the reticle is imaged clearly; starting a pumping source to start working, focusing the internal focusing collimator, imaging the reticle again, and recording that the focal length of the internal focusing collimator is f2 at the moment; recording the focal length adjustment distance of the focusing collimator tube before and after the pump source works as deltax=f2-f 1; the focal length of a thermal lens of the laser working substance is recorded as f; according to the geometrical optical imaging principle, the relation between Deltax and f and L1 is obtained, so that the thermal lens focal length f of the laser working substance is obtained through settlement; the laser working substance is a round laser rod, a square laser rod, a parallelogram laser strip or a trapezoid laser strip; the reticle is a cross reticle or a star reticle; the internal focusing collimator is manually or electrically focused; the pump source is a xenon lamp, a krypton lamp or a semiconductor laser array.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011235117.XA CN112504632B (en) | 2020-11-08 | 2020-11-08 | Hot focal length measuring device based on interior focusing collimator |
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| CN202011235117.XA CN112504632B (en) | 2020-11-08 | 2020-11-08 | Hot focal length measuring device based on interior focusing collimator |
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| CN112504632A CN112504632A (en) | 2021-03-16 |
| CN112504632B true CN112504632B (en) | 2023-09-19 |
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| CN2535180Y (en) * | 2002-02-07 | 2003-02-12 | 武汉楚天激光（集团）股份有限公司 | Optical zoom apparatus of coaxial display and location measurement for laser processing |
| CN1884991A (en) * | 2006-05-26 | 2006-12-27 | 北京工业大学 | Method for measuring tangential and radial thermal focuses of solid laser |
| CN101852677A (en) * | 2010-05-24 | 2010-10-06 | 中国科学院长春光学精密机械与物理研究所 | Method for improving focal distance detection precision of long focal distance collimator |
| CN102175429A (en) * | 2011-01-11 | 2011-09-07 | 山西大学 | Method for measuring thermal focus length of laser |
| CN103499431A (en) * | 2013-09-02 | 2014-01-08 | 长春理工大学 | Method and device for measuring dynamic thermal focal distance of solid laser crystal |
| CN104422583A (en) * | 2013-08-28 | 2015-03-18 | 中国计量科学研究院 | Optical system, optical detection device and method for detecting integrated refractometer |
| CN108760253A (en) * | 2018-08-17 | 2018-11-06 | 苏州帕沃激光科技有限公司 | A kind of laser crystal thermal focal method for fast measuring |
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| CN2535180Y (en) * | 2002-02-07 | 2003-02-12 | 武汉楚天激光（集团）股份有限公司 | Optical zoom apparatus of coaxial display and location measurement for laser processing |
| CN1884991A (en) * | 2006-05-26 | 2006-12-27 | 北京工业大学 | Method for measuring tangential and radial thermal focuses of solid laser |
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| CN102175429A (en) * | 2011-01-11 | 2011-09-07 | 山西大学 | Method for measuring thermal focus length of laser |
| CN104422583A (en) * | 2013-08-28 | 2015-03-18 | 中国计量科学研究院 | Optical system, optical detection device and method for detecting integrated refractometer |
| CN103499431A (en) * | 2013-09-02 | 2014-01-08 | 长春理工大学 | Method and device for measuring dynamic thermal focal distance of solid laser crystal |
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| CN109742642A (en) * | 2019-01-31 | 2019-05-10 | 华中科技大学 | A kind of solid state laser thermal lens focal length method and device |
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