CN202393974U - Device for generating long-distance approximately non-diffraction light beam - Google Patents
Device for generating long-distance approximately non-diffraction light beam Download PDFInfo
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- CN202393974U CN202393974U CN2011204898504U CN201120489850U CN202393974U CN 202393974 U CN202393974 U CN 202393974U CN 2011204898504 U CN2011204898504 U CN 2011204898504U CN 201120489850 U CN201120489850 U CN 201120489850U CN 202393974 U CN202393974 U CN 202393974U
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Abstract
The utility model discloses a device for generating a long-distance approximately non-diffraction light beam. The device comprises a laser arranged on an optical guide rail, wherein the optical guide rail is sequentially provided with an adjustable attenuator, a telescope collimation and beam expansion system, a light diaphragm, a first shaft pyramid, a convergent lens and a second shaft pyramid along a laser path, and the distance between the convergent lens and the first shaft pyramid is larger than the focal length of the convergent lens and is smaller than the propagation distance of an approximately non-diffraction light beam generated by the first shaft pyramid. The device for generating the long-distance approximately non-diffraction light beam, disclosed by the utility model, focalizes the approximately non-diffraction light beam generated by the first shaft pyramid by utilizing the convergent lens to form an annular light beam with a divergence angle, and irradiates the second shaft pyramid by utilizing the annular light beam with the divergence angle so as to generate a new approximately non-diffraction light beam; in addition, the propagation distance of the new approximately non-diffraction light beam is largely increased, and the divergence of central facula is relatively smaller.
Description
Technical field
The utility model relates to optical field, specifically is a kind of generation device of growing the approximate diffraction light-free bundle of distance.
Background technology
The diffraction light-free bundle have when free space is propagated keep that light distribution is constant, center spot is little, light intensity high concentration and the character of a series of uniquenesses such as reconstruction certainly.Therefore, since it is suggested, obtained extensive studies.Can not get proper diffraction light-free bundle though receive the restriction that does not have infinitely great energy,, the approximate diffraction light-free bundle that obtains in the laboratory has almost possessed the due characteristic of diffraction light-free bundle.It is high-precision fixed to multiple fields such as, range finding, collimation, Laser Processing and bioengineering that early stage researcher points out that the diffraction light-free bundle can be applied to.Up till now, there has been several different methods can produce approximate diffraction light-free bundle, met-lens method, axis of lens pyramid method, Resonant-cavity Method etc. like axle pyramid method, computer-generated hologram method, ring.But above the whole bag of tricks all can not obtain the very long approximate diffraction light-free bundle of transmission range because of the restriction that receives many factors such as finite aperture.The axle pyramid method the most frequently used like the laboratory, the desirable transmission range of the approximate diffraction light-free of its generation is Z
Max=R/ (n-1) γ (wherein R is the incident beam radius, and n is an axle pyramid material refractive index, and γ is a pyramid base angle).From above-mentioned expression formula, can find out; The desirable transmission range of approximate diffraction light-free is proportional to the incident beam radius; Be inversely proportional to a pyramid base angle; This just means that using radius is that 0.5 degree, refractive index are 1.516 axle pyramid as base angle of light beam irradiates of 5mm, and the ideal of the approximate diffraction light-free bundle that obtains does not have the diffraction distance only for about 1.11m.This makes the approximate application of diffraction light-free bundle at aspects such as orientation, range finding, collimations receive very big restriction.Therefore, how to obtain long and approximate diffraction light-free bundle good beam quality of propagation distance and just seem particularly important.Also some scholar has carried out some correlative studys both at home and abroad; For example; Zhao Bin etc. utilize telescopic system that the diffraction light-free that the axle pyramid produces is expanded bundle; Thereby obtain the approximate diffraction light-free of longer distance, amplified but this method also will be similar to the diffraction light-free center spot when enlarging no diffraction distance; Spherical wave after humans such as Vladimir Belyi focus on through the convergent lens no diffraction distance that will be similar to diffraction light-free of the method through two axle pyramids has continuously expanded tens meters to, yet that the center spot of the approximate diffraction light-free that this method produces is dispersed is equally quite severe.
The utility model content
The purpose of the utility model is to provide a kind of generation device of growing the approximate diffraction light-free bundle of distance, and it can make approximate diffraction light-free bundle propagation distance increase greatly, and that center spot is dispersed is less relatively.
To achieve these goals, the utility model adopts following technical scheme:
The generation device of the approximate diffraction light-free bundle of long distance; Comprise: optics guide rail, laser instrument, adjustable attenuator, telescope collimating and beam expanding system, diaphragm, first pyramid, second pyramid and convergent lens; Wherein, the base angle of first pyramid is less than the base angle of second pyramid;
On the optics guide rail, place laser instrument, on this optics guide rail, place adjustable attenuator, telescope collimating and beam expanding system, diaphragm, first pyramid, convergent lens, second pyramid successively along laser optical path; The propagation distance of the approximate diffraction light-free bundle that the distance between convergent lens and first pyramid produces greater than the focal length of convergent lens and less than first pyramid.
Above-mentioned laser instrument, above-mentioned adjustable attenuator, above-mentioned telescope collimating and beam expanding system, above-mentioned diaphragm, above-mentioned first pyramid, above-mentioned convergent lens and above-mentioned second pyramid slide arbitrarily on above-mentioned optics guide rail as required.
Above-mentioned adjustable attenuator is made up of two polaroids, comes the light intensity that sees through is controlled through the angle between the polarization direction that rotates these two these two polaroids of polaroids change.
After adopting such scheme, the generation device of the approximate diffraction light-free bundle of the long distance of the utility model is during work; Open laser instrument; Laser beam behind decay and beam-expanding collimation is through diaphragm, and first pyramid of normal incidence forms approximate no diffraction region in the certain distance behind first pyramid then.Convergent lens is placed in this approximate no diffraction region; On the back focal plane of convergent lens, form a focusing ring; Behind focusing ring, form the annular beam with angle of divergence, this annular beam normal incidence to the second pyramid will form new approximate diffraction light-free bundle behind second pyramid; It is long that this new approximate diffraction light-free bundle has propagation distance, and center spot angle of divergence features of smaller.And, as required, can be through changing the focal length of convergent lens, the distance between convergent lens and second pyramid and the base angle of first, second two axle pyramids parameter such as differ from and obtain propagation distance from tens meters to up to a hundred meters approximate diffraction light-free bundle.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is the light path synoptic diagram of the utility model;
Fig. 3 (a), Fig. 3 (b) are the hot spot figure that the different distance place is taken that is installed on of the utility model.
Embodiment
Be described in further detail below in conjunction with the structure and the principle of accompanying drawing the utility model.
The generation device of the approximate diffraction light-free bundle of the long distance of the utility model; As shown in Figure 1; Comprise optics guide rail 1, semiconductor laser 2, adjustable attenuator 3, telescope collimating and beam expanding system 4, diaphragm 5, first pyramid 6, convergent lens 7 and second pyramid 8; Wherein, the base angle of first pyramid 6 is less than the base angle of second pyramid 8; Adjustable attenuator 3 is made up of two polaroids, comes the light intensity that sees through is controlled through the angle between the polarization direction that rotates these two these two polaroids of polaroids change.
During work; Open semiconductor laser 2, semiconductor laser 2 produces laser beams, and this laser beam is the diaphragm 5 of R through radius behind adjustable attenuator 3 decay and telescope collimating and beam expanding system 4 beam-expanding collimations; First pyramid 6 of normal incidence is about Z behind first pyramid 6 then
Max1=R/ (n-1) γ
1Distance in form approximate no diffraction region, wherein R is the incident beam radius, n is a pyramid material refractive index, γ
1It is the base angle of first pyramid 6.Regulate the position of convergent lens 7 along the direction of laser optical path, make f＜d
1＜Z
Max1, at this moment, on the back focal plane of convergent lens 7, will form a focusing ring 9, wherein, f is the focal length of convergent lens 7, d
1Be first pyramid 6 with convergent lens 7 in along the distance on the laser optical path direction; Will form annular beam 10 behind the focusing ring 9 with angle of divergence θ; Wherein, annular beam 10 normal incidences to the second pyramid 8 has just formed new approximate diffraction light-free bundle 11 behind second pyramid 8.Approximate diffraction light-free bundle 11 propagation distances increase greatly, and that center spot is dispersed is less relatively.When getting parameter γ
1=0.5 °, γ
2=1 °, f=150mm, d
1=600mm, d
2=800mm, refractive index n=1.516 of first pyramid 6 and second pyramid 8 o'clock, wherein, γ
2Be the base angle of second pyramid 8, d
2For convergent lens 7 and second pyramid 8 in along the distance on the laser optical path direction, experiment records when approximate diffraction light-free bundle propagates into 80 meters, its center spot radius is about 10mm.Experiment clap different distance place hot spot shown in Fig. 3 (a), Fig. 3 (b), minimum scale is 20 μ m among Fig. 3 (a), minimum scale is 1mm among Fig. 3 (b).And this test Gauss light that employed semiconductor laser 2 sends when propagating into 80 meters the center spot radius reach 35mm.Because this requirement of experiment beam propagation distance is bigger, the light source power that therefore needs can not be too little, and the light source power that this experiment is adopted is 90mW.
The generation device of the approximate diffraction light-free bundle of long distance of the utility model mainly is to utilize the annular beam 10 that has angle of divergence θ to incide second pyramid 8 to produce the long approximate diffraction light-free bundle of propagation distance.Therefore the propagation distance that the angle of divergence of light beams is regulated the approximate diffraction light-free bundle that produces after can utilizing angle of divergence θ, the ring width S that changes annular beam 10 and directly changing second pyramid 8.Promptly utilize the focal distance f that changes convergent lens 7 to change the angle of divergence θ of annular beam 10; Change between convergent lens 7 and second pyramid 8 apart from d
2Change the ring width S that incides second pyramid 8; Change the base angle difference γ of first pyramid 6 and second pyramid 8
2-γ
1Come directly to change the angle of divergence of second pyramid, 8 back light beams.
Claims (3)
1. the generation device of the approximate diffraction light-free bundle of long distance; It is characterized in that: comprise optics guide rail, laser instrument, adjustable attenuator, telescope collimating and beam expanding system, diaphragm, first pyramid, second pyramid and convergent lens; Wherein, the base angle of first pyramid is less than the base angle of second pyramid;
On the optics guide rail, place laser instrument, on this optics guide rail, place adjustable attenuator, telescope collimating and beam expanding system, diaphragm, first pyramid, convergent lens, second pyramid successively along laser optical path; The propagation distance of the approximate diffraction light-free bundle that the distance between convergent lens and first pyramid produces greater than the focal length of convergent lens and less than first pyramid.
2. the generation device of the approximate diffraction light-free bundle of long distance according to claim 1, it is characterized in that: above-mentioned laser instrument, above-mentioned adjustable attenuator, above-mentioned telescope collimating and beam expanding system, above-mentioned diaphragm, above-mentioned first pyramid, above-mentioned convergent lens and above-mentioned second pyramid slide arbitrarily on above-mentioned optics guide rail as required.
3. the generation device of the approximate diffraction light-free bundle of long distance according to claim 1; It is characterized in that: above-mentioned adjustable attenuator is made up of two polaroids, comes the light intensity that sees through is controlled through the angle between the polarization direction that rotates these two these two polaroids of polaroids change.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204898504U CN202393974U (en) | 2011-11-30 | 2011-11-30 | Device for generating long-distance approximately non-diffraction light beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204898504U CN202393974U (en) | 2011-11-30 | 2011-11-30 | Device for generating long-distance approximately non-diffraction light beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202393974U true CN202393974U (en) | 2012-08-22 |
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ID=46668888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204898504U Expired - Fee Related CN202393974U (en) | 2011-11-30 | 2011-11-30 | Device for generating long-distance approximately non-diffraction light beam |
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| Country | Link |
|---|---|
| CN (1) | CN202393974U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419478A (en) * | 2011-11-30 | 2012-04-18 | 华侨大学 | Device for generating long-distance approximate diffraction-free light beam |
| CN107906470A (en) * | 2017-11-29 | 2018-04-13 | 马瑞利汽车零部件(芜湖)有限公司 | The vehicle signal lamp system of annular illumination |
-
2011
- 2011-11-30 CN CN2011204898504U patent/CN202393974U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102419478A (en) * | 2011-11-30 | 2012-04-18 | 华侨大学 | Device for generating long-distance approximate diffraction-free light beam |
| CN102419478B (en) * | 2011-11-30 | 2014-04-16 | 华侨大学 | Device for generating long-distance approximate diffraction-free light beam |
| CN107906470A (en) * | 2017-11-29 | 2018-04-13 | 马瑞利汽车零部件(芜湖)有限公司 | The vehicle signal lamp system of annular illumination |
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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: 20120822 Termination date: 20121130 |