CN101656394A - Laser reducing speckle - Google Patents
Laser reducing speckle Download PDFInfo
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- CN101656394A CN101656394A CN200910176017A CN200910176017A CN101656394A CN 101656394 A CN101656394 A CN 101656394A CN 200910176017 A CN200910176017 A CN 200910176017A CN 200910176017 A CN200910176017 A CN 200910176017A CN 101656394 A CN101656394 A CN 101656394A
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- doubling crystal
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Abstract
The embodiment of the invention discloses a laser reducing speckle, which relates to a laser and aims at solving the problem that laser speckle is generated on the screen in the prior art because of high coherence of a laser light source. The technical scheme provided by the invention comprises a pumping device, a gain medium, a variable period polarized frequency multiplication crystal and an input-output coupling mirror, wherein the pumping device is used for generating energy required by stimulated radiation of light; the gain medium generates the stimulated radiation according to the energy generated by the pumping device so as to obtain fundamental frequency light; the variable period polarized frequency multiplied crystal comprises more than two periods with different ranges, is usedfor obtaining frequency multiplication light and increasing the width of the frequency multiplication light; and the input-output coupling mirror is arranged at two ends of the laser gain medium andthe variable period polarized frequency multiplication crystal, forms an optical resonator together with the laser gain medium and the variable period polarized frequency multiplication crystal and isused for outputting the frequency multiplication light. The invention can be applied in the technical field of laser display and laser speckle reduction.
Description
Technical field
The present invention relates to a kind of laser, relate in particular to a kind of laser that reduces speckle.
Background technology
Laser display technology has characteristics such as big colour gamut, low energy consumption, is considered to main flow Display Technique of future generation.Laser is at first produced the stimulated radiation energy needed of light by pump arrangement when work, obtain fundamental frequency light through gain medium, and described fundamental frequency light is converted into frequency doubled light through frequency-doubling crystal, exports by output coupling mirror.For example, the pump laser diode of employing 808nm and collector lens are as pump arrangement, adopt Nd-doped yttrium vanadate Nb:YVO or neodymium-doped yttrium-aluminum garnet Nb:YAG laser crystal as gain medium, at first the pump laser diode by 808nm produces laser, focus on this laser in described laser crystal by collector lens, can produce the infrared laser that wavelength is 1064nm, can produce the green laser that wavelength is 532nm through KTP KTP frequency-doubling crystal again, the laser of other primary colours can adopt other block frequency-doubling crystal or periodic polarized frequency-doubling crystal to obtain.Wherein, place input coupling mirror and output coupling mirror respectively, form optical resonator in the outside of laser crystal and frequency-doubling crystal.
There are the following problems in the prior art: because LASER Light Source coherence height makes that when adopting laser display technology display frame meeting produces bigger laser speckle on the display screen, reduces image quality.
In order to address the above problem, people have adopted different apparatus and method.For example, on March 19th, 2008, disclosed publication number was that CN101144876, name are called " a kind of laser homogenizing coupler device that is used for laser display ", with on April 5th, 2006 disclosed publication number be that CN1755512, name are called in the Chinese patent patent application Publication Specification of " laser display apparatus " and all disclose a kind of laser aid of eliminating speckle, these two kinds of devices have all adopted more expensive optical fiber components, influence the popularization of product.
On November 5th, 2008, disclosed publication number was that CN101299511, name are called in the patent document of " a kind of method of expanding laser output linewidth " and disclose a kind of method that suppresses speckle, and this method suppresses the DeGrain of speckle.
Summary of the invention
Embodiments of the invention provide a kind of laser that reduces speckle, can increase the live width of LASER Light Source, reduce laser speckle.
For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of laser that reduces speckle comprises:
Pump arrangement, gain medium, variable period polarization frequency-doubling crystal, and input and output coupling mirror; Described pump arrangement is used to produce the stimulated radiation energy needed of light, the energy that described gain medium is used for producing according to pump arrangement produces stimulated radiation to obtain fundamental frequency light, described variable period polarization frequency-doubling crystal comprises the cycle that two above cycles vary in size, be used to obtain frequency doubled light, and increase the live width of described frequency doubled light, described input and output coupling mirror places the two ends of described gain medium and described variable period polarization frequency-doubling crystal, with described gain medium, described variable period polarization frequency-doubling crystal forms optical resonator together, is used to export described frequency doubled light.
Further, described pump arrangement comprises pumping source and optical coupling part.
Further, described pumping source comprises the semiconductor laser pumping source, perhaps gas fluorescent tube pumping source.
Further, described variable period polarization frequency-doubling crystal is the variable period polarization frequency-doubling crystal of variable duty cycle.
Further, the variable period of described variable duty cycle polarization frequency-doubling crystal comprises block frequency-doubling crystal or the frequency-doubling crystal with waveguide shapes.
Further, the change in duty cycle of the variable period of described variable duty cycle polarization frequency-doubling crystal distributes and determines according to the design principle of known change apodizing filter.
Further, described input and output coupling mirror comprises input reflection mirror and output reflector, perhaps input media film and output reflector, perhaps input reflection mirror and output medium film, perhaps input media film and output medium film.
Further, described variable period polarization frequency-doubling crystal specifically is used for: when described fundamental frequency light comprises two identical fundamental frequency light time of frequency size, be used to double described fundamental frequency light frequency; When described fundamental frequency light comprises the fundamental frequency light time that two frequencies vary in size, described fundamental frequency light frequency is used to superpose.
Further, described optical resonator comprises straight shape chamber, L shaped chamber, Z-shaped chamber or annular chamber.
The laser of the minimizing speckle that the embodiment of the invention provides, owing to adopted variable period polarization frequency-doubling crystal, make the live width of LASER Light Source increase, solved in the prior art because the height coherence of LASER Light Source, cause the bigger laser speckle of generation on the display screen, reduce the problem of image quality.The laser of the minimizing speckle that embodiments of the invention provide can increase the live width of LASER Light Source, reduces laser speckle.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention 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 is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The laser structure schematic diagram that Fig. 1 provides for the embodiment of the invention;
The laser structure schematic diagram that Fig. 2 provides for another embodiment of the present invention;
Fig. 3 is the design sketch that increases the frequency doubled light live width among the embodiment provided by the invention.
Embodiment
In order to solve in the prior art because the height coherence of LASER Light Source causes the bigger laser speckle of generations on the display screen, the problem of reduction image quality, the embodiment of the invention provides a kind of laser that reduces speckle.
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Referring to shown in Figure 1, the laser of the minimizing speckle that the embodiment of the invention provides comprises:
Pump arrangement 1 and 2 is used to produce the stimulated radiation energy needed of light.In the present embodiment, specifically comprise pumping source 1 and optical coupling part 2 in the pump arrangement, pumping source 1 produces disperses pump light, assembles described pump light by optical coupling part 2, as the input light source of gain medium.Described pumping source comprises the semiconductor laser pumping source, perhaps gas fluorescent tube pumping source.Preferably adopting output light wavelength in the present embodiment is that the laser diode of 808 nanometers is as pumping source, by described wavelength is the laser diode generation pump light of 808 nanometers, can import in the gain medium 4 fully in order to make this pump light, between gain medium 4 and pumping source, place optical coupling part 2, preferably, described optical coupling part 2 adopts common combination of lenses.
Gain medium 4 is used for producing stimulated radiation according to pump arrangement 1 and 2 energy that produce, and obtains fundamental frequency light; In the present embodiment, with Nb:YVO or Nb:YAG laser crystal as gain medium.For example, focus on described pump light by described combination of lenses, be input in Nb:YVO or the Nb:YAG laser crystal, make Nb:YVO or Nb:YAG laser crystal produce stimulated radiation, output laser is as fundamental frequency light.
Variable period polarization frequency-doubling crystal 5 comprises the cycle that two above cycles vary in size, and is used to obtain frequency doubled light, and increases the live width of described frequency doubled light.In the present embodiment, by gain medium output laser, as the fundamental frequency light of input variable period polarization frequency-doubling crystal, described fundamental frequency light is subjected to the nonlinear effect effect in described variable period polarization frequency-doubling crystal 5, realize accurate phase matched, produces frequency doubled light; Described variable period polarization frequency-doubling crystal is the nonlinear optical crystal that adopts the polarization of variable period Polarization technique, described frequency doubled light wavelength is by the polarization cycle decision in the described variable period polarization frequency-doubling crystal, the live width of described frequency doubled light is by the polarization cycle excursion decision in the described variable period polarization frequency-doubling crystal, and the distribution of described polarization cycle in described variable period polarization frequency-doubling crystal determined according to the design principle of known change apodizing filter.Preferably, described polarization cycle meets linear distribution in described variable period polarization frequency-doubling crystal.For example, be the length that the conversion ratio of frequency doubled light is determined described variable period polarization frequency-doubling crystal earlier according to the fundamental frequency phototransformation, obtain the number of described polarization cycle again according to known linear distribution rule, suppose to have 3 polarization cycle T1, T2, T3, as shown in Figure 1, the number of described polarization cycle increases, and the frequency doubled light live width by described variable period polarization frequency-doubling crystal is increased, thereby reduces the coherence of LASER Light Source.
Physical relationship between polarization cycle in the variable period polarization frequency-doubling crystal and the output frequency doubled light live width is as follows: suppose to have only a polarization cycle Λ in the variable period polarization frequency-doubling crystal, when the two bundle fundamental frequency light wavelengths that are input to described variable period polarization frequency-doubling crystal are respectively λ
1And λ
2The time, from the wavelength X of the frequency doubled light of variable period polarized crystal output
3With fundamental frequency light wavelength λ
1And λ
2Between satisfy following equation:
When two bundle fundamental frequency light wavelengths are identical, and be λ
1The time, above-mentioned formula 1 can be rewritten as:
N wherein
1Be that wavelength is λ
1The refractive index of laser in variable period polarization frequency-doubling crystal, n
2Be that wavelength is λ
2The refractive index of light in variable period polarization frequency-doubling crystal, n
3Be that wavelength is λ
3The refractive index of light in variable period polarization frequency-doubling crystal, and, because refractive index is the function of wavelength, behind the material of given variable period polarization frequency-doubling crystal and polarization cycle Λ, according to formula 1 can be unique definite output frequency multiplication light wavelength.When in the variable period polarization frequency-doubling crystal a plurality of polarization cycle being arranged, can determine a plurality of output frequency multiplication light wavelengths, and, quasi-phase matching utilized, optical maser wavelength after the frequency multiplication needs not to be 1/2nd of fundamental light wave length, can expand the live width of frequency doubled light so effectively.
Described variable period polarization frequency-doubling crystal specifically can be used for frequency multiplication and and frequency.Described frequency multiplication is meant, when two bundle fundamental frequency light frequency sizes of the described variable period polarization of input frequency-doubling crystal are identical, and the twice that to export described frequency multiplication light frequency size be described fundamental frequency light frequency size; Described and frequency is meant that when two bundle fundamental frequency light frequencies of the described variable period polarization of input frequency-doubling crystal varied in size, exporting described frequency multiplication light frequency size was the big or small sums of described two bundle fundamental frequency light frequencies.
Further, as shown in Figure 2, the variable period polarization frequency-doubling crystal 5 that described variable period polarization frequency-doubling crystal is a variable duty cycle.In the present embodiment, on the basis of variable period polarization frequency-doubling crystal, further change the duty ratio of described polarization cycle, the change profile of described duty ratio is determined according to known change apodizing filter principle, preferably, the change profile of described duty ratio meets this distribution of superelevation.In Fig. 1, the duty ratio of described polarization cycle T1, T2, T3 is 50%, and in Fig. 2, the duty ratio of described polarization cycle T1 becomes 50%, and the duty ratio of described polarization cycle T2 becomes 30%, and the duty ratio of described polarization cycle T3 becomes 10%.In actual applications, the number of described polarization cycle has thousands of, the duty ratio in each cycle can be identical, also can be different, for example, the duty ratio of preceding 100 polarization cycles is 50%, and the duty ratio of follow-up 100 polarization cycles is 30%, the rest may be inferred for other duty ratio distribution situation, totally meets the regularity of distribution that sets in advance.In the present embodiment, recently change the optical coupling coefficient of described variable period polarization frequency-doubling crystal by the duty that changes described polarization cycle, described optical coupling coefficient determines described frequency doubled light to respond with respect to described fundamental frequency light frequency.As shown in Figure 3, waveform 8 is the frequency multiplication spectrum of LASER Light Source in the prior art, and waveform 9 is the frequency multiplication spectrum that waveform 8 passes through the LASER Light Source that obtains behind the variable period polarization frequency-doubling crystal of variable duty cycles.As can see from Figure 3, adopt the variable period polarization frequency-doubling crystal of variable duty cycle can increase the live width of frequency doubled light, and the light intensity of each frequency is evenly distributed.The variable period polarization frequency-doubling crystal of described variable duty cycle can produce stable multimode output.
Further, the variable period of described variable duty cycle polarization frequency-doubling crystal comprises block frequency-doubling crystal or the frequency-doubling crystal with waveguide shapes.
Input and output coupling mirror 3 and 6, place the two ends of described gain medium 4 and described variable period polarization frequency-doubling crystal 5, form optical resonator together with described gain medium 4, described variable period polarization frequency-doubling crystal 5, be used to export described frequency doubled light, obtain LASER Light Source.Export from optical resonator in order to prevent the part fundamental frequency light that gain medium produces, cause follow-up light source output optical property is caused excessive influence, two input and output coupling mirrors that limit optical resonator in practice can be designed to fundamental frequency light is all-trans or high anti-in the present embodiment, not only can reduce leaking outside of fundamental frequency light like this, can also make the fully vibration in optical resonator of fundamental frequency light, improve the output intensity of the frequency doubled light of whole light source.
Described optical resonator is straight shape chamber, perhaps L shaped chamber, perhaps Z-shaped chamber, perhaps annular chamber; The light path that for example adopts the laser in L shaped chamber no longer is a straight line, and between gain medium and variable period polarization frequency-doubling crystal, increased a speculum that changes optical path direction, with respect to straight shape chamber, the optical resonator of L shaped chamber and other form is convenient to the optimization respectively of the beam size of the beam size of gain medium and variable period polarization frequency-doubling crystal.Described input and output coupling mirror is input reflection mirror and output reflector, perhaps input media film and output reflector, perhaps input reflection mirror and output medium film, perhaps input media film and output medium film; In the present embodiment, described input media film 3 is plated in described gain medium outer surface, and as Fig. 1 or shown in Figure 2, described output reflector 6 places the outside of described variable period polarization frequency-doubling crystal.
The laser of the minimizing speckle that the embodiment of the invention provides, owing to adopted variable period polarization frequency-doubling crystal, make the live width of LASER Light Source increase, solved in the prior art because the height coherence of LASER Light Source, cause the bigger laser speckle of generation on the display screen, reduce the problem of image quality.The laser of the minimizing speckle that embodiments of the invention provide can increase the live width of LASER Light Source, reduces laser speckle.
The above; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by described protection range with claim.
Claims (10)
1, a kind of laser that reduces speckle is characterized in that, comprising: pump arrangement, gain medium, variable period polarization frequency-doubling crystal, and input and output coupling mirror; Described pump arrangement is used to produce the stimulated radiation energy needed of light, the energy that described gain medium is used for producing according to pump arrangement produces stimulated radiation to obtain fundamental frequency light, described variable period polarization frequency-doubling crystal comprises the cycle that two above cycles vary in size, be used to obtain frequency doubled light, and increase the live width of described frequency doubled light, described input and output coupling mirror places the two ends of described gain medium and described variable period polarization frequency-doubling crystal, with described gain medium, described variable period polarization frequency-doubling crystal forms optical resonator together, is used to export described frequency doubled light.
2, the laser of minimizing speckle according to claim 1 is characterized in that, described pump arrangement comprises pumping source and optical coupling part.
3, the laser of minimizing speckle according to claim 2 is characterized in that, described pumping source comprises the semiconductor laser pumping source, perhaps gas fluorescent tube pumping source.
4, the laser of minimizing speckle according to claim 1 is characterized in that, the variable period polarization frequency-doubling crystal that described variable period polarization frequency-doubling crystal is a variable duty cycle.
5, the laser of minimizing speckle according to claim 4 is characterized in that, the variable period polarization frequency-doubling crystal of described variable duty cycle comprises block frequency-doubling crystal or the frequency-doubling crystal with waveguide shapes.
6, the laser of minimizing speckle according to claim 4 is characterized in that, the change in duty cycle of the variable period polarization frequency-doubling crystal of described variable duty cycle distributes and determines according to the design principle of known change apodizing filter.
7, the laser of minimizing speckle according to claim 1 is characterized in that, the cycle change profile of described variable period polarization frequency-doubling crystal is determined according to the design principle of known change apodizing filter.
8, the laser of minimizing speckle according to claim 1, it is characterized in that described input and output coupling mirror comprises input reflection mirror and output reflector, perhaps input media film and output reflector, perhaps input reflection mirror and output medium film, perhaps input media film and output medium film.
9, the laser of minimizing speckle according to claim 1 is characterized in that, described variable period polarization frequency-doubling crystal specifically is used for, and comprising:
When described fundamental frequency light comprises two identical fundamental frequency light time of frequency size, be used to double described fundamental frequency light frequency;
When described fundamental frequency light comprises the fundamental frequency light time that two frequencies vary in size, described fundamental frequency light frequency is used to superpose.
10, the laser of minimizing speckle according to claim 1 is characterized in that, described optical resonator comprises straight shape chamber, L shaped chamber, Z-shaped chamber or annular chamber.
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| CN2009101760171A CN101656394B (en) | 2009-09-18 | 2009-09-18 | Laser reducing speckle |
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| CN2009101760171A CN101656394B (en) | 2009-09-18 | 2009-09-18 | Laser reducing speckle |
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| CN101656394B CN101656394B (en) | 2011-08-10 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820286A (en) * | 2014-02-05 | 2015-08-05 | 恩耐激光技术有限公司 | Single-emitter line beam system |
| US10095016B2 (en) | 2011-01-04 | 2018-10-09 | Nlight, Inc. | High power laser system |
| US10295405B2 (en) | 2013-03-14 | 2019-05-21 | Nlight, Inc. | Active monitoring of multi-laser systems |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267107A (en) * | 2000-03-21 | 2000-09-20 | 复旦大学 | Method for improving quality of frequency-doubled light beam based on space phase compensation |
| US7193765B2 (en) * | 2005-03-31 | 2007-03-20 | Evans & Sutherland Computer Corporation | Reduction of speckle and interference patterns for laser projectors |
| CN101299511A (en) * | 2008-05-30 | 2008-11-05 | 福州高意通讯有限公司 | Method for expanding laser output linewidth |
| CN101436751A (en) * | 2008-12-10 | 2009-05-20 | 福州高意通讯有限公司 | Method for reducing laser speckle effect and method for generating the light source |
| CN101464557A (en) * | 2009-01-14 | 2009-06-24 | 福州高意通讯有限公司 | Optical structure for removing laser speckle |
-
2009
- 2009-09-18 CN CN2009101760171A patent/CN101656394B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10095016B2 (en) | 2011-01-04 | 2018-10-09 | Nlight, Inc. | High power laser system |
| US11256076B2 (en) | 2011-01-04 | 2022-02-22 | Nlight, Inc. | High power laser system |
| US10295405B2 (en) | 2013-03-14 | 2019-05-21 | Nlight, Inc. | Active monitoring of multi-laser systems |
| CN104820286A (en) * | 2014-02-05 | 2015-08-05 | 恩耐激光技术有限公司 | Single-emitter line beam system |
| CN104820286B (en) * | 2014-02-05 | 2021-07-23 | 恩耐公司 | Single emitter harness system |
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| CN101656394B (en) | 2011-08-10 |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co., Ltd Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: HISENSE ELECTRIC Co.,Ltd. |