CN1713691A - Generating method and generator for red green and blue laser in color laser TV-set - Google Patents
Generating method and generator for red green and blue laser in color laser TV-set Download PDFInfo
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- CN1713691A CN1713691A CN 200510014486 CN200510014486A CN1713691A CN 1713691 A CN1713691 A CN 1713691A CN 200510014486 CN200510014486 CN 200510014486 CN 200510014486 A CN200510014486 A CN 200510014486A CN 1713691 A CN1713691 A CN 1713691A
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Abstract
With optical parametric generator (OPG) of periodically poled crystal at 1064 nm optical pumping light outputted by SESAM mode locked laser, acquires 1570nm near infrared parametric laser. The 1570 parametric laser and 1064 pumping light are injected into KTP crystal to generate red light through mixing frequency. The transmissive near infrared parametric light and red light are injected into LBO crystal to generate blue light through mixing frequency. The pumping fundamental frequency light are doubled to acquire green light and red light and blue light that ar taken as tricolor laser source to output after separating. The device consists of SESAM mode locked laser, periodically poled crystal, constant temperature heater and nonlinear optical mixing frequency crystals.
Description
Technical field
The present invention relates to a kind of RGB method for generating laser and device that is used for laser color television.Belong to the laser television light sources technical field.
Background technology
The color laser TV is the panchromatic Display Technique of a kind of large-screen that development in recent years is got up.The redgreenblue LASER Light Source is meant that wavelength is that green glow and the wavelength that near ruddiness of 630nm and wavelength are 532nm is near the blue light of 450nm.The method that in the past produced RGB laser is taked gas laser more, or adopts the direct frequency double laser of the fixedly spectral line of the conventional output of solid state laser to export and realize.Because the power output of frequency doubling Blue-light laser can't reach watt more than the level for a long time, therefore actual tricolor laser light source is still the popular domain that attracts people's attention in the Laser Study field.
So the redgreenblue laser causes that people pay close attention in recent years, be because it to have colored gamut as the light source in the Display Technique wide, display color enriches true to nature more, the characteristics that colour reproduction is good.In the demonstration of large-scale public's media termination, entertainment and following family, application prospect is arranged all, have important social and scientific value.
Because the RGB laser has great application prospect, existing in the world at present seminar carries out the research in this field.The seminar of the most successful is German Jena university in 2004 studied successful mode-locked laser synchronous pump parametric oscillation and and watt level RGB laser that produces of frequency method, and realized big 24 square metres Large Screen Laser Display.
Though it is a lot of to obtain the method for RGB laser, principle is also different, utilizes parametric oscillation OPO (Optical ParametricOscillation) method to be subjected to the restriction of a lot of difficulty.Coherence's height at first do not require very high coherence, because can bring the appearance of flickering and vision speckle as the LASER Light Source that shows usefulness.Therefore the parametric oscillation OPO laser of low repeatability long-pulse laser pumping except that the nonlinear optics frequency conversion efficiency that produces is low, can not be eliminated the defects of vision that high coherence brings, and be not suitable for the light source as laser television.It is wide to adopt high-repetition-rate ultrashort pulse mode-locked laser to have bandwidth as the parametric oscillation OPO laser of pumping source, and the coherence is low, the characteristics of good visual effect.But the parametric oscillator OPO of mode-locked laser pumping requires to work in the synchronous pump mode, to the mechanical length stability of laser resonant cavity and accuracy require very highly, reach the magnitude of micron, realize that difficulty is quite big.
Summary of the invention
The object of the invention is to provide a kind of RGB method for generating laser and device of laser color television, and this method need not long feedback in complicated resonant cavity chamber and controlling organization, is easy to realize, its device also is easy to set up.
The present invention is realized by following technical proposals, adopts to comprise pump laser, frequency-doubling crystal, harmonic wave filter, green glow completely reflecting mirror; Fundamental frequency light partially reflecting mirror; Focus lamp; The heated at constant temperature copper billet, periodical poled crystal, lens, two nonlinear opticses and crystal frequently, the device that total reflective mirror constitutes, the method of the RGB laser of laser color television takes place, it is characterized in that comprising following process: the 1064nm fundamental frequency light that is taken place by pump laser injects periodical poled crystal through speculum and focus lamp, optical parameter by no cavity resonator structure produces the OPG process, obtain the near-infrared parameter laser of 1570nm, again with the parameteric light of 1570nm and the pump light of 1064nm, after closing the road, together injects by speculum nonlinear optics and frequency crystal KTP, with fundamental frequency light and near infrared light and frequency generation red-light, be 1/1570nm+1/1064nm=1/634.2nm: the 1570nm parameteric light of transmission and ruddiness together inject nonlinear optics and frequency crystal LBO, ruddiness and near infrared light are produced blue light with frequency, be 1/1570nm+1/634.2nm=1/451.7nm: add the frequency multiplication output green glow 532nm of pump light 1064nm again, the RGB three beams of laser after spectroscope separates is exported as three primary light source.
Realize the device of said method, comprise pump laser, frequency-doubling crystal, harmonic wave filter, green glow completely reflecting mirror; Fundamental frequency light partially reflecting mirror; Focus lamp; The heated at constant temperature copper billet, lens, two nonlinear opticses and crystal frequently, total reflective mirror, it is characterized in that also being included in that material is set between lens 6 and the lens 10 is lithium niobate, crystalline size is 50mm * 5mm * 0.5mm, the periodical poled crystal of single electricdomain width L=10 μ m, and the working temperature of this periodical poled crystal is for being arranged between 100 ℃～150 ℃; It is that the nonlinear optics of KTP is with crystal and material are nonlinear optics and the frequency crystal of LBO frequently that material is set after closing road speculum 11, ktp crystal adopts II class phase matched, its cutting angle is θ=76 ° φ=0 °, lbo crystal adopts I class phase matched, and their working temperature of its cutting angle θ=90 ° φ=17 ° is room temperature.
No matter the invention has the advantages that, be that parameter produces OPG, process still and frequently, employing all be no resonant cavity form, be characterized in that optical system is simple, no synchronous pump, beam path alignment and adjustment are very simple.The periodical poled crystal nonlinear optics conversion efficiency height that is adopted, the pumping source power requirement is low, and the three primary colors wavelength is selected to be more suitable in the laser television display system as three primary light source flexibly.
Description of drawings
Fig. 1 is the light channel structure schematic diagram of apparatus of the present invention.
Among the figure: 1-pump laser, 2-frequency-doubling crystal, 3-harmonic wave filter, 4-green glow completely reflecting mirror, 5-fundamental frequency light partially reflecting mirror, 6-focus lamp; 7-heated at constant temperature copper billet, 8-periodical poled crystal, 9-half-wave plate, 10-lens, 11-close the road speculum, 12-KTP nonlinear optics and frequency crystal, 13-be spectroscope, 14-total reflective mirror, 15-LBO nonlinear optics and frequency crystal.
One, fabrication cycle polarized crystal as requested:
Select the ferroelectric crystal of appropriate size and set other relevant parameter, specific as follows:
(1) select the pump light wavelength X p=1064nm of optical parametric oscillator, setting the optical maser wavelength that optical parameter produces OPG output is λ=1570nm, and the signal light wavelength that will produce as the periodical poled crystal optical parametric generator with this wavelength.
(2) material of selection cycle polarized crystal is a lithium niobate, and crystalline size is 50mm * 5mm * 0.5mm, single electricdomain width L=10 μ m;
(3) calculate gain matrix G+ (positive farmland), the G-(negative farmland) of wavelength X, and calculate the gain formula G (λ) of whole periodical poled crystal in single electricdomain.Consider lithium columbate crystal since light to sell off the threshold value of damage lower, be difficult at room temperature work, in general, need be controlled at more than 100 ℃ (373K), be 137 ℃ (410K) so set working temperature during calculated gains.
Two, with the periodical poled crystal of making 8, be placed in the temperature regulating device 7, come the optical parametric generator OPG of polarized crystal pumping cycle with the 1064nm wavelength laser of all-solid-state passive mode-locking laser 1 output of SESAM speculum, produce near infrared parameter laser.Near-infrared parameter laser and remaining pumping laser with output together is injected in first block of nonlinear optical crystal 12 then, warp and the output of the ruddiness of process generation frequently, the ruddiness of output is injected into second block of nonlinear optical crystal 15 simultaneously with the near-infrared parameteric light again, warp and the output of the blue light of process generation frequently.The acquisition of green glow can directly be obtained by the direct frequency multiplication of pumping fundamental frequency light 1064nm.Concrete light channel structure as shown in Figure 1.
The concrete parameter of each optics is: pumping source 1 adopts the laser with active-passive lock mould of SESAM speculum, and output wavelength is 1064nm, and repetition rate is about 80MHz, and pulse duration is 10ps.
The parameter laser output wavelength that produces in periodical poled crystal 8 is:
1/1570nm (e)+1/3301nm (e)=1/1064nm (e) has utilized the non linear coefficient d in the PPLN crystal
33Wherein 1570nm (e) is a flashlight, and 3301nm (e) is an ideler frequency light, and 1064nm (e) is a pump light, and the polarised direction of electric field is along the z direction of principal axis of crystal.Utilized the maximum nonlinear optics tensor unit in the uniaxial crystal lithium niobate.
First is used for and nonlinear optical crystal frequently 12 adopts the II class phase matched of biaxial crystal KTP, generation with the frequency laser wavelength be:
1/1570nm (o)+1/1064nm (e)=1/634.2nm (o) KTP II class
Wherein 1570nm (o) is the flashlight that produces in the PPLN crystal, and the pump light of 1064nm (e) beam splitting, the ruddiness of generation are 634.2nm (o).
Second and frequently the nonlinear optical crystal 15 of usefulness adopt the I class phase matched of biaxial crystal LBO, produce and the frequency laser wavelength is:
1/1570nm (o)+1/634.2nm (o)=1/451.7nm (e) LBOI class
Wherein 1570nm (o) is the flashlight that PPLN crystal parameter produces, and it is 451.7nm (e) with the ruddiness of crystal generation frequently and the blue light wavelength that produces frequently that 634.2nm (o) is first.
Claims (2)
1. the RGB method for generating laser of a laser color television adopts to comprise pump laser, frequency-doubling crystal, harmonic wave filter, green glow completely reflecting mirror; Fundamental frequency light partially reflecting mirror; Focus lamp; The heated at constant temperature copper billet, periodical poled crystal, lens, two nonlinear opticses and crystal frequently, the device that total reflective mirror constitutes, the method of the RGB laser of laser color television takes place, it is characterized in that comprising following process: the 1064nm fundamental frequency light that is taken place by pump laser injects periodical poled crystal through speculum and focus lamp, optical parameter by no cavity resonator structure produces the OPG process, obtain the near-infrared parameter laser of 1570nm, again with the parameteric light of 1570nm and the pump light of 1064nm, after closing the road, together injects by speculum nonlinear optics and frequency crystal KTP, with fundamental frequency light and near infrared light and frequency generation red-light, be 1/1570nm+1/1064nm=1/634.2nm: the 1570nm parameteric light of transmission and ruddiness together inject nonlinear optics and frequency crystal LBO, ruddiness and near infrared light are produced blue light with frequency, be 1/1570nm+1/634.2nm=1/451.7nm: add the frequency multiplication output green glow 532nm of pump light 1064nm again, the RGB three beams of laser after spectroscope separates is exported as three primary light source.
2. a device of realizing the described method of claim 1 comprises pump laser, frequency-doubling crystal, harmonic wave filter, green glow completely reflecting mirror; Fundamental frequency light partially reflecting mirror; Focus lamp; The heated at constant temperature copper billet, lens, two nonlinear opticses and crystal frequently, total reflective mirror, it is characterized in that also being included in that between lens [6] and the lens [10] material to be set be lithium niobate, crystalline size is 50mm * 5mm * 0.5mm, the periodical poled crystal of single electricdomain width L=10 μ m, and the working temperature of this periodical poled crystal is for being arranged between 100 ℃～150 ℃; Material is set afterwards is the nonlinear optics of KTP and frequently crystal and material are the nonlinear optics of LBO and crystal frequently closing road speculum [11], ktp crystal adopts II class phase matched, its cutting angle is θ=76 ° φ=0 °, lbo crystal adopts I class phase matched, and their working temperature of its cutting angle θ=90 ° φ=17 ° is room temperature.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111433667A (en) * | 2017-10-27 | 2020-07-17 | 科安德有限公司 | Laser light source and laser projector with optical device for reducing speckle noise and method for operating such a laser light source and such a laser projector |
| CN113759644A (en) * | 2020-06-02 | 2021-12-07 | 华为技术有限公司 | Light source system and laser projection display device |
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2005
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111433667A (en) * | 2017-10-27 | 2020-07-17 | 科安德有限公司 | Laser light source and laser projector with optical device for reducing speckle noise and method for operating such a laser light source and such a laser projector |
| US11442335B2 (en) | 2017-10-27 | 2022-09-13 | Q.ant GmbH | Systems and methods for managing incoherent laser beams |
| CN113759644A (en) * | 2020-06-02 | 2021-12-07 | 华为技术有限公司 | Light source system and laser projection display device |
| WO2021244488A1 (en) * | 2020-06-02 | 2021-12-09 | 华为技术有限公司 | Light source system and laser projection display device |
| CN113759644B (en) * | 2020-06-02 | 2022-12-27 | 华为技术有限公司 | Light source system and laser projection display device |
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| CN100490496C (en) | 2009-05-20 |
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