CN203133397U - Laser emitting apparatus - Google Patents
Laser emitting apparatus Download PDFInfo
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- CN203133397U CN203133397U CN 201220728783 CN201220728783U CN203133397U CN 203133397 U CN203133397 U CN 203133397U CN 201220728783 CN201220728783 CN 201220728783 CN 201220728783 U CN201220728783 U CN 201220728783U CN 203133397 U CN203133397 U CN 203133397U
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Abstract
The utility model provides a laser emitting device. The device is provided with a laser light source, a concave lens and two convex lenses from inside to outside. Diffusion and bean expansion are performed on laser beams of the laser emitted by the laser light source through the concave lens, such that portions of which the light intensity is weak, which are at the edge of the laser, are diffused to a greater degree; portions of which the light intensity is strong, which are at the middle of the laser, are weakened; light beam recombination collimation is performed on the laser beams which pass through the concave lens through the two convex lenses; the first convex lens performs primary convergence on the laser beams and collimates selected portions of which the light rays are uniform; and then, the other convex lens performs secondary convergence and collimation on the laser beams. With the laser emitting device adopted, the lenses do not require to be blocked; diffusion and beam expansion can be performed on the laser through the concave lens; and two times of collimation is performed on the laser beams through the two convex lenses; as a result, laser with collimated and uniform light rays can be obtained; and at the same time, the light intensity of the laser can be ensured.
Description
Technical field
The utility model relates to laser technology field, more particularly, relates to a kind of laser beam emitting device.
Background technology
Laser diode can be used as the Lights section of laser analyzer, laser analyzer sends the laser beam (only can by gas absorption to be measured) of specific wavelength by laser diode, when passing gas to be measured, the decay of laser intensity becomes certain functional relation with the concentration of gas to be measured, therefore just can analyze the concentration that obtains gas to be measured by measuring the laser intensity dampening information.But, because the laser intensity launched of laser diode is distributed as Gaussian distribution, namely in the middle of light intensity stronger, marginal distribution a little less than, and have the angle of divergence, so have very big deviation with this laser detection gas concentration to be measured.Therefore, be the deviation of the gas concentration to be measured that reduces to obtain, we need obtain light and collimate uniform laser.
The protection eyeglass is installed in the launching tube of laser analyzer, is used for laser diode and test environment are isolated.Prior art collimates uniform laser for obtaining light, and method is anti-dazzling screen to be attached on the protection eyeglass block.Because laser intensity is distributed as Gaussian distribution, the characteristics of Gaussian distribution are exactly that middle light intensity is very strong, the edge light intensity is very weak, and the annular section light intensity between centre and edge be approximate uniformly, just can obtain light and collimate uniform laser by blocking like this.
Because prior art is to block in the middle of the lens and the marginal portion, shielded area is crossed conference and is reduced laser intensity, blocks too smallly not reach the uniform effect of laser, so shielded area is difficult for determining.
The utility model content
In view of this, the utility model provides a kind of laser beam emitting device, need not in the middle of the lens and marginal portion is blocked with realization, still can obtain light and collimate uniform laser.
A kind of laser beam emitting device, described device are equipped with LASER Light Source, first concavees lens, first convex lens and second convex lens from inside to outside successively,
Described first concavees lens have first virtual focus and second virtual focus, and described first convex lens have first real focus and second real focus, and described second convex lens have the 3rd real focus and the 4th real focus;
The distance of described first virtual focus and described LASER Light Source is first distance, and the distance of described second virtual focus and described LASER Light Source is second distance, and described first distance is less than described second distance;
The distance of described first real focus and described LASER Light Source is the 3rd distance, and the distance of described second real focus and described LASER Light Source is the 4th distance, and described the 3rd distance is less than described the 4th distance;
The distance of described the 3rd real focus and described LASER Light Source is the 5th distance, and the distance of described the 4th real focus and described LASER Light Source is the 6th distance, and described the 5th distance is less than described the 6th distance;
The position of the position of described first virtual focus and described first real focus coincides with first focus, and the distance of the central point of described first convex lens and the described second convex lens central point is not less than one times of focal length of described second convex lens.
Preferably, described LASER Light Source is laser diode.
Preferably, described first concavees lens are identical with the diameter of described first convex lens.
Preferably, described first convex lens are different with the diameter of described second convex lens.
Preferably, the diameter of described second convex lens with see through described second convex lens after the size of the laser facula that obtains become positive correlation.
From above-mentioned technical scheme as can be seen, the utility model provides a kind of laser beam emitting device, this device is equipped with LASER Light Source, concavees lens and two convex lens from inside to outside successively, the laser that LASER Light Source is launched carries out dispersing, expanding of laser beam by concavees lens earlier, light intensity weak part in laser edge is dispersed greatly, and the part that middle light intensity is strong is carried out intensity and is weakened.Laser beam by concavees lens carries out light beam reorganization collimation by two convex lens more successively, first convex lens carry out the first time to laser beam and assemble, choose light and partly collimate uniformly, and then by another sheet convex lens laser beam is carried out assembling the second time collimation.Therefore, the utility model need not lens are blocked, and laser is dispersed and is expanded by concavees lens, by two convex lens laser beam is carried out collimation twice again, can obtain light and collimate uniform laser.Simultaneously, the utility model removes by the part of concavees lens a little less than with laser outward flange light intensity, and, disperse by concavees lens and suitably to weaken the strong part of light intensity in the middle of the laser, with respect to the method that prior art part that middle light intensity is strong and the part a little less than the edge light intensity are all removed, guaranteed the light intensity of laser.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the disclosed a kind of laser beam emitting device of the utility model embodiment;
Fig. 2 is the structural representation of a kind of concavees lens among the utility model embodiment;
Fig. 3 is the structural representation of a kind of convex lens among the utility model embodiment;
Fig. 4 is the structural representation of the another kind of convex lens among the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, the utility model embodiment discloses a kind of laser beam emitting device, and described device can be equipped with LASER Light Source 100, first concavees lens 200, first convex lens 300 and second convex lens 400 from inside to outside successively,
As shown in Figure 2, described first concavees lens 200 have first virtual focus 210 and second virtual focus 220,
As shown in Figure 3, described first convex lens 300 have first real focus 310 and second real focus 320,
As shown in Figure 4, described second convex lens 400 have the 3rd real focus 410 and the 4th real focus 420,
Wherein, described first virtual focus 210 is first distance with the distance of described LASER Light Source 100, and described second virtual focus 220 is second distance with the distance of described LASER Light Source 100, and described first distance is less than second distance;
Described first real focus 310 is the 3rd distance with the distance of described LASER Light Source 100, and described second real focus 320 is the 4th distance with the distance of described LASER Light Source 100, and described the 3rd distance is less than described the 4th distance;
Described the 3rd real focus 410 is the 5th distance with the distance of described LASER Light Source 100, and described the 4th real focus 420 is the 6th distance with the distance of described LASER Light Source 100, and described the 5th distance is less than described the 6th distance;
As shown in Figure 1, the position of the position of described first virtual focus 210 and described first real focus 310 coincides with first focus 001, and the distance of the central point of described first convex lens 300 and described second convex lens, 400 central points is not less than one times of focal length of described second convex lens 400.
Concrete, concavees lens are called negative globe lens again, eyeglass central thin, and peripheral thick, concavity is so be concavees lens again.Concavees lens have disperse function to light, directional light by concavees lens generation deviation after, divergence of beam is called divergent rays.Because divergent rays can not form real focus, so divergent rays is prolonged along its reverse extending line, meet at a bit in the same side of throw light, this point is called virtual focus.Wherein concavees lens have two virtual focuses.
Convex lens are to make according to the refraction principle of light, and its central authorities are thicker, and the edge is thinner.Convex lens can be divided into biconvex, plano-convex and form such as concavo-convex, because convex lens have converging action to light, so can be called collector lens again.After parallel rays reflected by convex lens, convergence of rays was in a bit, and this point is called real focus.Wherein convex lens have two real focus.
Be understandable that the position of the position of first virtual focus 210 described in the utility model and described first real focus 310 coincides with first focus 001, namely described first concavees lens 200 and described first convex lens 300 are empty confocal arrangement.Therefore, after laser beam is dispersed, is expanded by described first concavees lens 200, the reverse extending line focus of laser beam is at described first virtual focus 210 places, because described first virtual focus 210 and overlap with described first real focus 310, so can regard the light source that is positioned at described first real focus 310 as, to described first convex lens, 300 emission laser beams, therefore, laser beam obtains the parallel beam of laser by described first convex lens 300 backs.
Concrete, in the practical application, when selecting described first concavees lens 200 and described first convex lens 300, we can select according to the collimation multiplying power, and collimation multiplying power formula is as follows:
Wherein: f
1Be Concave Mirrors Focus, f
2Be focal length of convex lens, ω (l) is the beam radius of incoming laser beam on concavees lens, ω
0Be incident gauss light beam waist radius.
Wherein, described gauss light beam waist radius is defined as 87% o'clock the beam radius that laser intensity drops to original laser intensity, described gauss light beam waist radius is relevant with the character of LASER Light Source self, namely be that LASER Light Source is just determined when dispatching from the factory, even identical LASER Light Source, their gauss light beam waist radius is also different.
As can be seen, collimation multiplying power and focal length of convex lens are directly proportional with the ratio of Concave Mirrors Focus from formula.
It will be appreciated by persons skilled in the art that convex lens (concavees lens) are more thick, more strong to the refracting power of light, the focal length of convex lens (concavees lens) is more short, and on the contrary, convex lens (concavees lens) are more thin, refracting power to light is more weak, and the focal length of convex lens (concavees lens) is more long.Simultaneously, the density of material of convex lens (concavees lens) itself is also influential to the focal length of himself, and density of material is more big, and its focal length is more short, and on the contrary, density of material is more little, and its focal length is more long.
Be understandable that, image-forming principle according to convex lens, image distance (being focal length) is during less than object distance (being the distance of central point and described second convex lens, 400 central points of described first convex lens 300 in the utility model), light source is the virtual image through the picture that convex lens generate, collimate uniform laser because need to obtain light in the utility model, be real image, so the distance of the central point of described first convex lens 300 and described second convex lens, 400 central points is not less than one times of focal length of described second convex lens 400.
Preferably, the diameter of described first concavees lens 200 and described first convex lens 300 can be identical, we can be by selecting described first concavees lens 200 and described first convex lens 300 of different-thickness, so that described first concavees lens 200 and described first convex lens 300 are empty confocal arrangement like this.
Preferably, the diameter of described first convex lens 300 and described second convex lens 400 can be different, because the diameter of convex lens with see through convex lens after the size of the laser facula that obtains become positive correlation, the diameter that is convex lens is more big, described laser facula is more big, the convex lens diameter is more little, and laser facula is more little.
In the practical application, laser beam carries out the collimation first time by described first convex lens 300 earlier, carry out the collimation second time by described second convex lens 400 again, so we can choose described second convex lens 400 that vary in size according to reality to the needs of spot size, so that finally the emission angle of the laser beam that obtains is less than 0.1 °, the hot spot of acquisition is in the 10mm-14mm scope.
Preferably, described LASER Light Source 100 can be laser diode, can also be can lasingly the installing of semiconductor laser or other, and the utility model is not done restriction at this.
In summary it can be seen that the selection of described first concavees lens 200, first convex lens 300 and described second convex lens 400 can calculate according to emission angle and the collimation multiplying power of the emission angle (being the gauss light beam waist radius) of LASER Light Source, the laser that need obtain.
Be understandable that, in practice, can come to provide foundation to the research and development improvement of instrument by emulation (namely using controlled means to come situation that is virtually reality like reality).By the method for laser gaussian beam wave simulation, the final laser waveform that obtains in the utility model is carried out drawing after the emulation, the wavelength that the wavelength of the final laser beam that obtains of the utility model and actual needs obtain is basic identical.
Preferably, wave aberration refers to by the actual corrugated of optical system and departing from of desirable corrugated.The wave aberration of optical system namely can be regarded as near perfect condition less than λ/4, and the wave aberration in the utility model can reach λ/30, illustrates that ripple that the utility model obtains looks like to compare common optical system and more has superiority.
Preferably, intensity by the final laser beam that obtains of the utility model of optical design software ZEMAX is carried out emulation, when being 0-9mm as the diameter when the laser facula that obtains, any position at this laser facula, the laser intensity that can record this point all between the 97%-98% of original laser intensity, namely we final what obtain is light intensity collimation and laser uniformly.
In summary, the utility model provides a kind of laser beam emitting device, this device is equipped with LASER Light Source, concavees lens and two convex lens from inside to outside successively, the laser that LASER Light Source is launched carries out dispersing, expanding of laser beam by concavees lens earlier, light intensity weak part in laser edge is dispersed greatly, and the part that middle light intensity is strong is carried out intensity and is weakened.Laser beam by concavees lens carries out light beam reorganization collimation by two convex lens more successively, first convex lens carry out the first time to laser beam and assemble, choose light and partly collimate uniformly, and then by another sheet convex lens laser beam is carried out assembling the second time collimation.Therefore, the utility model need not lens are blocked, and laser is dispersed and is expanded by concavees lens, by two convex lens laser beam is carried out collimation twice again, can obtain light and collimate uniform laser.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments herein.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the wideest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a laser beam emitting device is characterized in that, described device is equipped with LASER Light Source, first concavees lens, first convex lens and second convex lens from inside to outside successively,
Described first concavees lens have first virtual focus and second virtual focus, and described first convex lens have first real focus and second real focus, and described second convex lens have the 3rd real focus and the 4th real focus;
The distance of described first virtual focus and described LASER Light Source is first distance, and the distance of described second virtual focus and described LASER Light Source is second distance, and described first distance is less than described second distance;
The distance of described first real focus and described LASER Light Source is the 3rd distance, and the distance of described second real focus and described LASER Light Source is the 4th distance, and described the 3rd distance is less than described the 4th distance;
The distance of described the 3rd real focus and described LASER Light Source is the 5th distance, and the distance of described the 4th real focus and described LASER Light Source is the 6th distance, and described the 5th distance is less than described the 6th distance;
The position of the position of described first virtual focus and described first real focus coincides with first focus, and the distance of the central point of described first convex lens and the described second convex lens central point is not less than one times of focal length of described second convex lens.
2. device according to claim 1 is characterized in that, described LASER Light Source is laser diode.
3. device according to claim 1 is characterized in that, described first concavees lens are identical with the diameter of described first convex lens.
4. device according to claim 1 is characterized in that, described first convex lens are different with the diameter of described second convex lens.
5. device according to claim 1 is characterized in that, the diameter of described second convex lens with see through described second convex lens after the size of the laser facula that obtains become positive correlation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220728783 CN203133397U (en) | 2012-12-26 | 2012-12-26 | Laser emitting apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220728783 CN203133397U (en) | 2012-12-26 | 2012-12-26 | Laser emitting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203133397U true CN203133397U (en) | 2013-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220728783 Expired - Lifetime CN203133397U (en) | 2012-12-26 | 2012-12-26 | Laser emitting apparatus |
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| CN (1) | CN203133397U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018908A (en) * | 2012-12-26 | 2013-04-03 | 重庆川仪自动化股份有限公司 | Laser emission device |
| CN107064907A (en) * | 2017-03-07 | 2017-08-18 | 北京环境特性研究所 | A kind of laser beam emitting device of new LRCS test systems |
| CN109375192A (en) * | 2018-12-12 | 2019-02-22 | 广州维思车用部件有限公司 | Automated driving system, laser radar and its Laser emission structure |
-
2012
- 2012-12-26 CN CN 201220728783 patent/CN203133397U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018908A (en) * | 2012-12-26 | 2013-04-03 | 重庆川仪自动化股份有限公司 | Laser emission device |
| CN107064907A (en) * | 2017-03-07 | 2017-08-18 | 北京环境特性研究所 | A kind of laser beam emitting device of new LRCS test systems |
| CN109375192A (en) * | 2018-12-12 | 2019-02-22 | 广州维思车用部件有限公司 | Automated driving system, laser radar and its Laser emission structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
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| CX01 | Expiry of patent term |