CN101493628A - Threshold adjustable optical limiter - Google Patents
Threshold adjustable optical limiter Download PDFInfo
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- CN101493628A CN101493628A CNA2009100471691A CN200910047169A CN101493628A CN 101493628 A CN101493628 A CN 101493628A CN A2009100471691 A CNA2009100471691 A CN A2009100471691A CN 200910047169 A CN200910047169 A CN 200910047169A CN 101493628 A CN101493628 A CN 101493628A
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- optical limiter
- nonlinear refraction
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- refraction material
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Abstract
The invention relates to an optical limiter with adjustable threshold, comprising a nonlinear refractive material, a diaphragm and a supporting encapsulation device; the nonlinear refractive material and the diaphragm are arranged in the supporting encapsulation device; wherein, the nonlinear refractive material is arranged in front of the diaphragm; the incident laser beam sequentially passes through the nonlinear refractive material and the diaphragm; the diaphragm is provided with a clear aperture with changeable size; and the position of the diaphragm corresponding to the nonlinear refractive material is changed by an adjusting device. Compared with the prior art, the optical limiter utilizes the combination of the thermal lens effect of the nonlinear refractive material and the changeable diaphragm, realizes the optical limiter with adjustable threshold, has simple structure, easy preparation and low cost, has convenient, online and real-time adjustment of the limiting threshold, can be applied to various situations, provides guarantee for the safe use of precise optical devices (including human eyes), and prompting the improvement of the laser protection technique.
Description
Technical field
The present invention relates to the optical device of the lasing safety of a kind of physics Laser Experiments and application, particularly a kind of optical limiter.
Background technology
Since laser instrument came out, along with the development and the progress of laser technology, the peak power output and the laser intensity of laser instrument were more and more higher, about the scientific experiment and the technology of light laser are used progressively deeply.Because light laser is easy to damage human eye, optical detector, optical precision instrument etc., must take certain safeguard procedures for this reason.Optical limiter is exactly a kind of optical device that can reach this protection effect.The principle of work of optical limiter is: for weak laser; it has higher transmittance; and for light laser; its transmitance is lower; the laser intensity that sees through optical limiter like this is limited in certain maximal value following (how high no matter the input laser intensity has), and then plays the effect of various thereafter precison optical components of protection and instrument (comprising human eye).This maximum limiting threshold that is called optical limiter through value.Because the unique applications of optical limiter, people are actively making great efforts to seek new material and new principle (as: nonlinear scattering, non-linear absorption, nonlinear refraction) is made optical limiter novel, superb optical performance always.But up to the present, the limiting threshold of the optical limiter of most finished products is a fixed value, can only be applicable to certain specific occasions or specific parameter environment, and its threshold value does not have adjustability.If can go out the optical limiter that limiting threshold can be regulated as required at any time by exploitation and composition, then it can be applied in multiple occasion neatly, will be subjected to very big favor.
Thermal lensing effect is to have a kind of optical phenomena that is embodied than the strong nonlinearity refractive material, promptly when Gaussian laser beam shines this material, material internal refractive index everywhere presents non-homogeneous, will play the effect with similar lens to the propagation of laser beam.For the material with negative thermal lensing effect, the refractive index of material and the intensity of laser are inversely proportional to, and like this for common Gaussian beam, material will play the effect of similar negative lens to the propagation of light beam, and it is big that the spot diameter of transmission light field will become.Generally, be directly proportional with the power of incident laser (Pu, et al. of the diameter of hot spot, Laser self-induced thermo-optical effects ina magnetic fluid, Journal of Applied Physics, Volume 96, Page5930,2004).If place the diaphragm that the aperture is suitable in this material back, then the light intensity (or power) by diaphragm not always with the linear direct ratio of incident intensity (or power), its maximum light intensity (or power) that sees through will be limited, promptly formed the effect of optics amplitude limit, this maximum value that sees through is limiting threshold.In addition, by the aperture size of change diaphragm and the relative space position of diaphragm, can change maximum and see through light intensity (or power), and then reach the purpose that changes limiting threshold.But through the prior art document is retrieved discovery, the technology that also never has the combination of the thermal lensing effect of utilizing material and iris to make the adjustable optical limiter of threshold value.In view of this, develop the optical limiter that a kind of threshold value can online adjusting and have crucial meaning.
Summary of the invention
The present invention is the changeless technical matters of threshold value that will solve existing optical limiter, and provide a kind of threshold value adjustable optical limiter, this optical limiter utilization reaches the effect of optics amplitude limit than thermal lensing effect and the function that the aperture is variable, diaphragm that can move forward and backward realizes limiting transmitted light intensity (or power) of strong nonlinearity refractive material.
Technical solution of the present invention is: the optical limiter that a kind of threshold value is adjustable comprises a kind of nonlinear refraction material, a diaphragm and a support packaging system; Nonlinear refraction material and diaphragm place and support packaging system, and wherein, the nonlinear refraction material is before diaphragm, and incoming laser beam has the clear aperature of variable size successively by nonlinear refraction material and diaphragm on the described diaphragm; The position of described diaphragm relative nonlinear refractive material changes by adjusting gear.
Incident light is Gaussian beam or accurate Gaussian beam.The nonlinear refraction material is solid, liquid or gas nonlinear refraction material.The nonlinear refraction coefficient of described nonlinear refraction material is a negative value.Supporting packaging system is cylindrical shape, ellipse or the cuboid of hollow.One guide rail is arranged at the bottom of supporting packaging system, and diaphragm is fixed on the guide rail, and slides before and after on guide rail, in order to change the distance between diaphragm and the nonlinear refraction material.
Beneficial effect of the present invention is: compared with prior art, the present invention has utilized the thermal lensing effect of nonlinear refraction material and the combination of iris, has realized the optical limiter that a kind of threshold value is adjustable, and it is simple in structure, making is easy, with low cost.The limiting threshold of this optical limiter is easy to adjust, online, real-time, can be used in multiple different occasion, for the safe handling of precision optics (comprising human eye) provides guarantee, has promoted the raising of lasing safety technology.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention;
Fig. 2 is a principle of work synoptic diagram of the present invention;
Fig. 3 is that the limiting threshold of optical limiter of the present invention can be by the synoptic diagram of aperture of the diaphragm adjusting;
Fig. 4 is that the limiting threshold of optical limiter of the present invention can be by the synoptic diagram of stop position adjusting;
Fig. 5 is the laser facula photo that sees through the nonlinear refraction material of the embodiment of the invention;
Fig. 6 is the optics amplitude limiting characteristic experimental curve diagram of the embodiment of the invention.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, be the one-piece construction synoptic diagram of the adjustable optical limiter of threshold value, it comprises: 1, one diaphragm 2 of a kind of nonlinear refraction material and a support packaging system 3.Nonlinear refraction material 1 and diaphragm 2 place and support packaging system 3, and its position relation is: nonlinear refraction material 1 is before diaphragm 2, and incoming laser beam 7 is successively by nonlinear refraction material 1 and diaphragm 2.
The clear aperature 9 of diaphragm 2 can be regulated size by adjusting knob 5.The position of described diaphragm 2 relative nonlinear refractive materials 1 can change by adjusting gear 6.Incoming laser beam 7 is Gaussian beam or accurate Gaussian beam.
The nonlinear refraction coefficient of nonlinear refraction material 1 is relatively large, and is negative value.Nonlinear refraction material 1 is solid, liquid or gas nonlinear refraction material 1.
Supporting packaging system 3 is cylindrical shape, ellipse or the cuboid of hollow, is used for nonlinear refraction material 1 and diaphragm 2 are fixed and be encapsulated in wherein.One guide rail 4 is arranged at the bottom in the described support packaging system 3, and diaphragm 2 is fixed on the guide rail 4, and can slide front and back on guide rail 4, in order to change the relative spacing of diaphragm 2 and nonlinear refraction material 1.
To specifically describe the principle of work of the adjustable optical limiter of threshold value of the present invention below:
As shown in Figure 2, when the power of incoming laser beam 7 hangs down, see through the aperture 9 of the spot size of nonlinear refraction material 1 less than diaphragm, the power of the emergent light 8 by diaphragm 2 equals the power (nonlinear refraction material 1 is not for there being the material that absorbs) of incoming laser beam 7 (Fig. 2 a) like this.Under the constant situation of the width of light beam that keeps incoming laser beam 7, when the power of incoming laser beam 7 is higher, see through the aperture 9 of the spot size of nonlinear refraction material 1 greater than diaphragm 2, so only some incident laser can pass through diaphragm 2, and the power of the emergent light 8 of diaphragm 2 is than the power little (Fig. 2 b) of incoming laser beam 7.When incoming laser beam 7 power continue to increase, the hot spot by nonlinear refraction material 1 was increasing simultaneously, and under the constant situation in the aperture 9 of diaphragm 2, the luminous power by diaphragm 2 will no longer increase (Fig. 2 c), reach the effect of optics amplitude limit.
As shown in Figure 3, hour (Fig. 3 a) in the aperture 9 of diaphragm 2, luminous power by diaphragm 2 relatively weak (hot spot that sees through nonlinear refraction material 1 is all the time greater than the aperture 9 of diaphragm 2), and under the situation that the power of incoming laser beam 7 is determined, increase the aperture 9 (Fig. 3 b) of diaphragm 2, then the power of the emergent light 8 by diaphragm 2 will become greatly, thereby can regulate the limiting threshold of optical limiter by the aperture 9 that changes diaphragm 2.
As shown in Figure 4, under all constant situation in the aperture 9 of the power of incoming laser beam 7 and diaphragm 2, hour (Fig. 4 a) when the distance of diaphragm 2 and nonlinear refraction material 1, the power of the emergent light 8 by diaphragm 2 is bigger, and when the distance of diaphragm 2 and nonlinear refraction material 1 is big (Fig. 4 b), then the power of the emergent light 8 by diaphragm 2 is less.So when changing the relative spacing of diaphragm 2 and nonlinear refraction material 1, the power of the emergent light 8 by diaphragm 2 also will change, thereby can regulate the limiting threshold of optical limiter by the position 10 that changes diaphragm 2 thereupon.
To be further described with embodiment below:
Utilize the incoming laser beam 7 of wavelength for 632.8nm, shine the ferromagnetic colloidal sol 1 that has than the strong nonlinearity refraction, because the thermal lensing effect of the ferromagnetic colloidal sol 1 of nonlinear refraction, it is big that the spot diameter of its transmitted light beam becomes, and Fig. 5 is the captured laser facula photo that sees through the ferromagnetic colloidal sol of nonlinear refraction of this embodiment.After the ferromagnetic colloidal sol 1 of nonlinear refraction, place a diaphragm 2 again, the aperture 9 of fixed aperture 2 and position 10, progressively change the power of incoming laser beam 7, utilize laser powermeter to measure the power of the emergent light 8 of diaphragm, can draw the variation relation of the power of emergent light 8 with the power of incoming laser beam 7, be optics amplitude limit curve, can determine its limiting threshold by the amplitude limit curve.Adopt Fig. 3, change the aperture 9 of diaphragm 2, and its stationkeeping is constant, repeats above-mentioned experimentation, can draw amplitude limit curve and corresponding limiting threshold thereof under difference (diaphragm 2) aperture 9.Adopt Fig. 4, the aperture 9 of diaphragm 2 is constant, and only changes the position 10 of diaphragm 2, the influence that can draw the 10 pairs of limiting thresholds in position of diaphragm 2.This embodiment has obtained amplitude limiting characteristic curve under two kinds of differences (diaphragm 2) aperture 9, and (Fig. 6 is the amplitude limiting characteristic curve (Fig. 6 b) under different with two kinds (diaphragm 2) position 10 a).
Experiment shows: under the situation of the invariant position of fixed aperture 2 (distance from the ferromagnetic colloidal sol 1 of nonlinear refraction is 1.6m), when the diameter 9 of diaphragm 2 is 5mm, the limiting threshold of optical limiter is 1.66mW, and when the diameter 9 of diaphragm 2 increased to 8mm, its limiting threshold was brought up to 3.48mW.Diameter 9 at diaphragm 2 immobilizes under the situation of (for 6.5mm), when diaphragm 2 when the distance of the ferromagnetic colloidal sol 1 of nonlinear refraction is 1.2m, the limiting threshold of optical limiter is 5.07mW, when diaphragm 2 when the distance of the ferromagnetic colloidal sol 1 of nonlinear refraction shortens to 0.6m, its limiting threshold is brought up to 9.00mW.
The above embodiments just are used to provide and illustrate the present invention, but the scope of not limiting to this invention and being included.Other relevant variation of the present invention for a professional with usual skill, is easy and tangible.These all should be included within the present invention's scope required for protection according to the equivalent and the modification of spirit of the present invention.
Claims (6)
1. the optical limiter that threshold value is adjustable comprises a kind of nonlinear refraction material (1), a diaphragm (2) and a support packaging system (3); It is characterized in that: described nonlinear refraction material (1) and diaphragm (2) place and support packaging system (3), wherein, nonlinear refraction material (1) at diaphragm (2) before, incoming laser beam (7) has the clear aperature (9) of variable size successively by nonlinear refraction material (1) and diaphragm (2) on the described diaphragm (2); The position of described diaphragm (2) relative nonlinear refractive material (1) is by adjusting gear (6) change.
2. the adjustable optical limiter of threshold value according to claim 1 is characterized in that: described incoming laser beam (7) is Gaussian beam or accurate Gaussian beam.
3. the adjustable optical limiter of threshold value according to claim 1 is characterized in that: described nonlinear refraction material (1) is solid, liquid or gas nonlinear refraction material.
4. according to claim 1 or the adjustable optical limiter of 3 described threshold values, it is characterized in that: the nonlinear refraction coefficient of described nonlinear refraction material (1) is a negative value.
5. the adjustable optical limiter of threshold value according to claim 1 is characterized in that: described support packaging system (3) is the cylindrical shape of hollow, ellipse or cuboid.
6. the adjustable optical limiter of threshold value according to claim 1 or 5, it is characterized in that: described support packaging system (3), one guide rail (4) is arranged at its bottom, diaphragm (2) is fixed on the guide rail (4), and before and after guide rail (4) is gone up, slide, in order to change the distance between diaphragm (2) and the nonlinear refraction material (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100471691A CN101493628A (en) | 2009-03-06 | 2009-03-06 | Threshold adjustable optical limiter |
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| CNA2009100471691A CN101493628A (en) | 2009-03-06 | 2009-03-06 | Threshold adjustable optical limiter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102121985A (en) * | 2010-12-23 | 2011-07-13 | 福州福特科光电有限公司 | Secondary optical path focusing structure in receiving module of laser radar ranging system |
| CN101729142B (en) * | 2009-12-04 | 2012-06-20 | 南京大学 | Method for automatically controlling received power in FSO system |
| CN102681288A (en) * | 2012-05-23 | 2012-09-19 | 上海交通大学 | Silicon-based optical amplitude limiter |
| CN102886601A (en) * | 2011-07-21 | 2013-01-23 | 深圳市通发激光设备有限公司 | Laser welding machine provided with dynamic diaphragm device |
| CN103197483A (en) * | 2013-04-23 | 2013-07-10 | 中国科学院上海光学精密机械研究所 | Pneumatic-control optical limiter |
| CN103941517A (en) * | 2014-04-11 | 2014-07-23 | 东南大学 | Optical limiter with small limiting threshold value |
| CN108106501A (en) * | 2017-12-15 | 2018-06-01 | 佛山市校友桥网络科技有限公司 | A kind of anti-laser hardening method of optoelectronic device |
| CN113514967A (en) * | 2021-05-11 | 2021-10-19 | 岭南师范学院 | Controllable stealthy device based on thermal lens effect |
| WO2022010422A1 (en) * | 2020-07-09 | 2022-01-13 | National University Of Singapore | Method and device for optical power limiter |
-
2009
- 2009-03-06 CN CNA2009100471691A patent/CN101493628A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101729142B (en) * | 2009-12-04 | 2012-06-20 | 南京大学 | Method for automatically controlling received power in FSO system |
| CN102121985A (en) * | 2010-12-23 | 2011-07-13 | 福州福特科光电有限公司 | Secondary optical path focusing structure in receiving module of laser radar ranging system |
| CN102886601A (en) * | 2011-07-21 | 2013-01-23 | 深圳市通发激光设备有限公司 | Laser welding machine provided with dynamic diaphragm device |
| CN102681288B (en) * | 2012-05-23 | 2015-03-25 | 上海交通大学 | Silicon-based optical amplitude limiter |
| CN102681288A (en) * | 2012-05-23 | 2012-09-19 | 上海交通大学 | Silicon-based optical amplitude limiter |
| CN103197483A (en) * | 2013-04-23 | 2013-07-10 | 中国科学院上海光学精密机械研究所 | Pneumatic-control optical limiter |
| CN103197483B (en) * | 2013-04-23 | 2015-04-15 | 中国科学院上海光学精密机械研究所 | Pneumatic-control optical limiter |
| CN103941517A (en) * | 2014-04-11 | 2014-07-23 | 东南大学 | Optical limiter with small limiting threshold value |
| CN103941517B (en) * | 2014-04-11 | 2016-07-06 | 东南大学 | A kind of optical limiter of low clip threshold value |
| CN108106501A (en) * | 2017-12-15 | 2018-06-01 | 佛山市校友桥网络科技有限公司 | A kind of anti-laser hardening method of optoelectronic device |
| WO2022010422A1 (en) * | 2020-07-09 | 2022-01-13 | National University Of Singapore | Method and device for optical power limiter |
| EP4179386A4 (en) * | 2020-07-09 | 2024-08-07 | Nat Univ Singapore | Method and device for optical power limiter |
| CN113514967A (en) * | 2021-05-11 | 2021-10-19 | 岭南师范学院 | Controllable stealthy device based on thermal lens effect |
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Open date: 20090729 |