CN201269803Y - Laser bar positive thermal lens focal length measuring device - Google Patents
Laser bar positive thermal lens focal length measuring device Download PDFInfo
- Publication number
- CN201269803Y CN201269803Y CNU2008201535973U CN200820153597U CN201269803Y CN 201269803 Y CN201269803 Y CN 201269803Y CN U2008201535973 U CNU2008201535973 U CN U2008201535973U CN 200820153597 U CN200820153597 U CN 200820153597U CN 201269803 Y CN201269803 Y CN 201269803Y
- Authority
- CN
- China
- Prior art keywords
- observation device
- laser
- thermal lens
- laser bar
- convex lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005259 measurement Methods 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 6
- 238000003384 imaging method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Images
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The measuring device comprises a laser, a beam collimation and expansion system, a thin convex lens and an observation device, wherein the beam collimation and expansion system, the thin convex lens and the observation device are sequentially arranged on an output light path of the laser. The utility model has the characteristics of simple structure measures convenient accuracy.
Description
Technical field
The utility model relates to a kind of thermal lensing effect of laser bar, especially a kind of measurement mechanism of thermal lens positive focal-length of laser bar.
Background technology
Laser material generates heat because of having absorbed pumping radiation, and heat radiation requires its surface is cooled off, and the two makes the uneven Temperature Distribution of the inner generation of laser material.Because the change of temperature and stress changes refractive index, causes the distortion of laser beam.For laser bar, refractive index variable quantity relevant with temperature and radius r are quadratic relations, and the space phase that will occur quadratic power along the axial light beam of propagating of rod changes, and this disturbance is equivalent to the spherical lens effect, be called thermal lensing effect, wherein the thermal lens positive effect is comparatively common.Thermal lensing effect not only influences the output energy and the beam divergence angle of laser instrument, when focus drops on laser bar inside, and will be in the inner damage from laser that produces of operation material.The thermal lensing effect of laser bar is revised and compensated at present existing several different methods.But, at first must obtain the focal length value of thermal lens in order to realize the compensation of thermal lensing effect effectively.
Summary of the invention
The purpose of this utility model is to provide a kind of measurement mechanism of thermal lens positive focal-length of laser bar at the prior art present situation, and it can measure short thermal lens positive focal-length of laser bar value accurately, easily.
The purpose of this utility model is achieved by the following technical solution:
A kind of measurement mechanism of thermal lens positive focal-length of laser bar, formation comprises laser instrument, beam collimation and beam-expanding system, thin convex lens and observation device, sets gradually described beam collimation and beam-expanding system, thin convex lens and observation device on the output light path of described laser instrument.
Described observation device can be a film viewing screen, also can be the beam profile analyser, and described beam profile analyser has the automatic measurement function of beam diameter.
Utilize the measuring method of the measurement mechanism of described thermal lens positive focal-length of laser bar, it is characterized in that comprising the following steps: thermal lens positive focal-length of laser bar
1. open described laser instrument, described laser instrument emitted laser is by parallel inciding on the testing laser rod behind described beam collimation and the beam-expanding system, the diameter of described parallel incident light is not less than the diameter of described testing laser rod, described parallel incident light is by forming described transmitted light path behind the described testing laser rod, described observation device is perpendicular to described transmitted light path;
2. described observation device is begun to move along described light path parallel by the rear surface of described testing laser rod, when the hot spot on the described observation device by reducing to become when increasing, write down the position at described observation device place, i.e. the focal position scope;
3. described observation device continues to move a certain distance the static placement in back backward along light path, and described transmitted light forms initial hot spot on described observation device, measure the diameter of described initial hot spot;
4. described thin convex lens are inserted light path between described testing laser rod and described observation device, and make described thin convex lens vertical with light path, the focal length of described thin convex lens should be greater than the distance of described observation device to described focal position scope, described thin convex lens move in the scope of described focal position, described transmitted light forms imaging facula on described observation device, measure the diameter of described imaging facula, when the diameter of described imaging facula equals the diameter of described initial hot spot, the position at described thin convex lens place is exactly the position of focus of the thermal lens positive of described testing laser rod, and the position of the focus of described thermal lens positive and described testing laser rod are the focal length value of the thermal lens positive of described testing laser rod along the distance of optical path direction center.
Advantage of the present utility model is:
1, the measurement mechanism of thermal lens positive focal-length of laser bar provided by the utility model, measurement mechanism is easy.
2, the measurement mechanism of thermal lens positive focal-length of laser bar provided by the utility model, measuring process is accurately convenient.
3, the utility model adopts the automatic measuring beam diameter of beam profile analyser, is convenient to carry out automatic measurement.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1.
Fig. 2 is the structural representation of the utility model embodiment 2.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples, but should not limit protection domain of the present utility model with this.
Embodiment 1:
Fig. 1 is the structural representation of the utility model embodiment 1.As seen from the figure, the measurement mechanism of the utility model thermal lens positive focal-length of laser bar, formation comprises laser instrument 1, beam collimation and beam-expanding system 2, thin convex lens 5 and observation device 4, sets gradually described beam collimation and beam-expanding system 2, thin convex lens 5 and observation device 4 on the output light path of described laser instrument 1.Described laser instrument 1 is that wavelength is the He-Ne laser instrument of 543nm, described beam collimation and beam-expanding system 2 are beam collimation and beam expanding telescope, described observation device 4 is an observation screen, the diameter of the parallel incident light behind the beam expander that the He-Ne laser instrument sends is not less than the diameter of testing laser rod 3, observation device 4 is vertical with light path, rear surface by testing laser rod 3 begins to move backward along light path, when the hot spot on the observation device 4 by reducing to become when increasing, the focal position scope at hourly observation device 4 places, observation device 4 continues to move a certain distance the static placement in back backward along light path, the transmitted light of testing laser rod 3 forms initial hot spot on observation device 4, measure the diameter of initial hot spot, to approach convex lens 5 and insert light path, thin convex lens 5 are vertical with light path, the focal length of thin convex lens 5 is greater than the distance of observation device 4 to the focal position scope, thin convex lens 5 move in the scope of described focal position, the transmitted light of testing laser rod 3 forms imaging facula on observation device 4, measure the diameter of imaging facula, when the diameter of imaging hot spot equals the diameter of initial hot spot, the position at thin convex lens 5 places is exactly the position of the focus of thermal lens positive, the position of the focus of thermal lens positive and testing laser rod 5 are the focal length value of the thermal lens positive of testing laser rod 5 along the distance of optical path direction center.Described observation device 4 is an observation screen.
Embodiment 2: as shown in Figure 2, other structures of the measurement mechanism of this thermal lens positive focal-length of laser bar are identical with embodiment one, difference is that described observation device 4 is beam profile analyser 6 automatic measuring beam diameters, be convenient to carry out automatic measurement, and employing and embodiment one identical method obtains the focal length value of thermal lens positive.
Above embodiment only is used to the technical solution of the utility model is described and is unrestricted.Although the utility model is had been described in detail with reference to most preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the claim scope of the present utility model.
Claims (2)
1, a kind of measurement mechanism of thermal lens positive focal-length of laser bar, be characterised in that its formation comprises laser instrument (1), beam collimation and beam-expanding system (2), thin convex lens (5) and observation device (4), sets gradually described beam collimation and beam-expanding system (2), thin convex lens (5) and observation device (4) on the output light path of described laser instrument (1).
2, the measurement mechanism of thermal lens positive focal-length of laser bar according to claim 1 is characterized in that described observation device (4) is an observation screen or beam profile analyser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201535973U CN201269803Y (en) | 2008-09-27 | 2008-09-27 | Laser bar positive thermal lens focal length measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201535973U CN201269803Y (en) | 2008-09-27 | 2008-09-27 | Laser bar positive thermal lens focal length measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201269803Y true CN201269803Y (en) | 2009-07-08 |
Family
ID=40842411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201535973U Expired - Fee Related CN201269803Y (en) | 2008-09-27 | 2008-09-27 | Laser bar positive thermal lens focal length measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201269803Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175429A (en) * | 2011-01-11 | 2011-09-07 | 山西大学 | Method for measuring thermal focus length of laser |
| CN105547656A (en) * | 2016-02-02 | 2016-05-04 | 潍坊学院 | Method and device for online measurement of laser crystal thermal lens focal length in real time |
-
2008
- 2008-09-27 CN CNU2008201535973U patent/CN201269803Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175429A (en) * | 2011-01-11 | 2011-09-07 | 山西大学 | Method for measuring thermal focus length of laser |
| CN102175429B (en) * | 2011-01-11 | 2013-06-05 | 山西大学 | Method for measuring thermal focus length of laser |
| CN105547656A (en) * | 2016-02-02 | 2016-05-04 | 潍坊学院 | Method and device for online measurement of laser crystal thermal lens focal length in real time |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101358898A (en) | Device and method for measuring focal length of positive thermal lens of laser bar | |
| CN103098319B (en) | Laser beam analytical equipment | |
| CN101833150B (en) | Fiber coupling module of high-power semiconductor laser | |
| CN103399381B (en) | Optical-fiber laser delivery | |
| US7920763B1 (en) | Mode field expanded fiber collimator | |
| CN101666706B (en) | Device for measuring thermal lens focal length of end-pumped solid-state laser and method | |
| CN201805141U (en) | Uniform laser ray device based on high-power semi-conductor laser | |
| CN103063415B (en) | A kind of long focus length of lens measuring method based on Moire fringe coupling | |
| CN107861200B (en) | A kind of the fiber coupling adjusting and monitoring method of the space laser for cold atom guiding | |
| CN102621694A (en) | Strip-shaped astigmatic beam shaping and collimating device | |
| Hsu et al. | Investigation of optical fibers for coherent anti-Stokes Raman scattering (CARS) spectroscopy in reacting flows | |
| CN102607812A (en) | Detection device of heat effect of side pump laser module | |
| Vivini et al. | The LMJ: overview of recent advancements and very first experiments | |
| CN201269803Y (en) | Laser bar positive thermal lens focal length measuring device | |
| CN101320132B (en) | High power laser beam expander | |
| CN113687474B (en) | Vortex light beam and optical fiber efficient coupling system and method | |
| CN204612671U (en) | A kind of detection light path of optical thin film element thermal deformation | |
| CN102590800A (en) | 2 mu m coherent wind detection lidar beam pre-expansion system | |
| CN204479187U (en) | Based on the collimated light beam detector of two pentaprism | |
| CN102419478A (en) | Device for generating long-distance approximate diffraction-free light beam | |
| CN203595516U (en) | Optical waveguide coupling device for fiber optic gyro | |
| CN102004297B (en) | Low-temperature optical installation and regulation method for defocusing compensation of optical flat | |
| CN211477573U (en) | Pyramid auto-collimation scanning device for collimator focus detection | |
| CN103499890B (en) | Multikilowatt collimation-type isolator | |
| CN102937513B (en) | Method and system for monitoring three dimensional angle disturbance of optical gratings on line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090708 Termination date: 20130927 |