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52 results about "Photo damage" patented technology
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Common Photo Damage: Crazing. Photos may not seem alive to you, but they react and are impacted by the environment that surrounds them. Most photo damage happens slowly over time and takes people by surprise one day. While there are many types of photo damage, environmental deterioration is one form that can be almost 100% avoided in today’s world.
Composition for treating hair against chemical and photo damage
The present invention relates to a hair treatment composition which provides an excellent finishing effect and superior protection against environmental, chemical, and grooming-associated damage. The compositions of the present invention comprise hydrolyzed protein having an abundance of anionic amino acids and in particular, sulphur-containing amino acids, as well as divalent cationic compounds, such that the anionic components of the hydrolyzed protein may effectively bind to the hair by means of cationic bridges. While bound to the hair, the sulphur containing amino acids in the hydrolyzed protein may serve as "decoys" for the effects of a variety of damaging agents. Compositions of the present invention may further comprise a vitamin compound which enhances these protective benefits.
Owner:LOREAL SA
Compositions and methods for treating photo damaged skin
The present invention is drawn to formulations, methods, and solidified layers for topical delivery of an immune modulating agent for treatment of photo damaged skin. The formulation can include an immune modulating agent, a solvent vehicle, and a solidifying agent. The solvent vehicle can include a volatile solvent system having one or more volatile solvent, and a non-volatile solvent system having one or more non-volatile solvent, wherein non-volatile solvent system is capable of facilitating the delivery of immune modulating agent at therapeutically effective rates over a sustained period of time. The formulation can have a viscosity suitable for application to a skin surface prior to evaporation of the volatile solvents system. When applied to the skin, the formulation can form a solidified layer after at least a portion of the volatile solvent system is evaporated.
Owner:ZARS INC
Near infrared microbial elimination laser system
InactiveUS20080021370A1Minimal heat depositionElectrotherapyGum massageOptical interactionHeat deposition
Dual wavelength laser energy in the near infrared electromagnetic spectrum is described as destroying bacteria via photo-damage optical interactions through direct selective absorption of optical energy by intracellular bacterial chromophores. Use of various dual wave length laser systems include use of optical assembly including two distinct diode laser ranges (including 870 nm and 930 nm) that can be emitted to achieve maximal bacterial elimination without intolerable heat deposition. Related processes for medical procedures are also described.
Owner:NOMIR MEDICAL TECH
Near infrared microbial elimination laser system
InactiveUS20080159345A1Minimal heat depositionWide applicabilityLaser detailsWater/sewage treatment by irradiationOptical interactionDual wavelength laser
A dual wavelength laser in the low infrared electromagnetic spectrum is disclosed for destruction of bacteria via photo-damage optical interactions through direct selective absorption of optical energy by intracellular bacterial chromophores. The dual wavelength (NIMELS) laser includes an optical assembly and all associated components necessary for the housing of two distinct diode laser arrays (870 nm diode array and 930 nm diode array) that can be emitted through an output connector and wavelength multiplexer as necessary. With this preferred design, the dual wavelengths (870 nm and 930 nm) can be emitted singly, or multiplexed together to be conducted along a common optical pathway, or multiple optical pathways, to achieve maximal bacterial elimination.
Owner:NOMIR MEDICAL TECH
Method for protection of skin against sun-induced damage by oral administration of an extract of Emblica officinalis (syn. Phyllanthus emblica)
InactiveUS20050089590A1Effective sun protectionEffective protectionBiocideUnknown materialsOral medicationPhoto damage
A method to retard, prevent and reverse the sign of skin photo-damage, comprising administering, to a human subject in need thereof, a therapeutically effective dose of a formulation comprising an extract of Emblica officinalis as the active ingredient.
Owner:EMD CHEM +1
Compositions and methods for treating dermatological conditions
The present invention is drawn to solidifying adhesive formulations, methods of drug delivery, and solidified layers for dermal delivery of a drug which can treat various dermatological conditions, such as a bacterial infection, a virus infection, a fungal infection, alopecia, dermatitis, psoriasis, or photo damaged skin. The formulation can include a drug, a solvent vehicle, and a solidifying agent. The solvent vehicle can include a volatile solvent system including at least one volatile solvent, and a non-volatile solvent system including at least one non-volatile solvent. The non-volatile solvent system can facilitate the delivery of the drug at therapeutically effective rates for sustained period of time. The non-volatile solvent system can also act as a plasticizer for the solidifying agent. The formulation can have a viscosity suitable for application to a skin surface prior to evaporation of the volatile solvents system. When applied to the skin, the formulation can form a solidified layer after at least a portion of the volatile solvent system is evaporated.
Owner:NUVO RES
Method for treating damaged skin
InactiveUS7521459B2Promote absorptionInduce pro-inflammatory responseBiocideCosmetic preparationsTopical preparationToll-like receptor
The invention relates to a method and composition for treating aged or photo-damaged skin. In one embodiment, the invention includes using a composition comprising about 1% to about 2% of 1-isobutyl-1H-imidazo [4,5,-C] quinolin-4-amine in a topical preparation or cream. In further embodiments, the method includes identifying topical compositions that can diagnose or identify precancerous region of the skin, as well as methods for treating aged or photo-damaged skin by applying a Toll-like receptor activator, such as 1-isobutyl-1H-imidazo [4,5,-C] quinolin-4-amine.
Owner:METABEAUTY
Erbium-doped lithium niobate crystal and preparation method thereof
InactiveCN101575734APolycrystalline material growthBy pulling from meltPhysical chemistryErbium doping
The invention provides an erbium-doped lithium niobate crystal and a preparation method thereof; the preparation method comprises the step of taking 99.99 percent of MgO, 99.99 percent of Er2O3, 99.99 percent of Nb2O5 and 99.99 percent of LiCO3 by weight percentage as raw materials, wherein the doping quantities of MgO, Er2O3 and Li / Nb are respectively 0-8mol%, 1-4mol% and 0.946-0.65mol%. The invention comprehensively utilizes the two means of doping of photo-damage resistant elements and growth of stoichiometric ratio, and simultaneously realizes the Er ion low-cluster concentration and strong photo-damage resistance of the lithium niobate crystal which is a substrate material for an active optical waveguide device, thereby obtaining the significantly improved optical emission property with a wave band of 1.5Mum and promoting the advancement of the active LN optical waveguide device to a practical use stage.
Owner:HARBIN INST OF TECH
Indium cerium iron triple-doped lithium niobate crystal and preparation method thereof
InactiveCN101768780ALow doping thresholdExcellent volume holographic storage performancePolycrystalline material growthBy pulling from meltNonlinear optical crystalHolographic storage
Owner:YANSHAN UNIV
Air gap type BBO (Barium Boron Oxide) laser polarizing prism
The invention relates to a design of a polarizing prism, comprising a right-angle prism design and a film spacer layer option, wherein the crystal optical axis direction of the right-angle prism is parallel to the plane of a normal of an inclined surface and vertical to a normal of an end surface, and a wedge angle of the right-angle prism falls within a range of 38.10-39.30 degrees; and the film spacer layer is an organic film which is 50-100 microns thick, an elliptical hole is formed in the middle of the film spacer layer, and the proportion between the longer axis and the shorter axis of the ellipse is 1.3. A BBO (Barium Boron Oxide) crystal is cut according to requirements on the optical axis direction to be made into two right-angle prisms; and incident end surfaces and inclined surfaces of the prisms both need to be polished and plated with moisture-proof films. The device provided by the invention is applicable to lights within a wavelength range of 250-35000 nm and has the characteristics of extinction ratio of superior to 1x(10)-5 and photo damage resistance threshold of 1.2 GW / cm2; and the angle range of light incidence from -0.6 degree and +0.6 degree is allowed while the device is used within the wavelength of 250-35000 nm. The transmittance and the photo damage resistance of the laser polarizing prism are superior to those of a calcite polarizing prism.
Owner:QUFU NORMAL UNIV
Method for fabricating semiconductor package
InactiveUS20140134797A1Avoid damageImprove production yieldSemiconductor/solid-state device detailsSolid-state devicesSemiconductor chipSemiconductor package
A method for fabricating a semiconductor package is disclosed, which includes the steps of: providing a carrier having a release layer and an adhesive layer sequentially formed thereon; disposing a plurality of semiconductor chips on the adhesive layer; forming an encapsulant on the adhesive layer for encapsulating the semiconductor chips; disposing a substrate on the encapsulant; exposing the release layer to light through the carrier so as to remove the release layer and the carrier; and then removing the adhesive layer, thereby effectively preventing the semiconductor chips from being exposed to light so as to avoid any photo damage to the semiconductor chips.
Owner:SILICONWARE PRECISION IND CO LTD
Bio-particle three-dimensional manipulation device based on coil
InactiveCN101851577AImplement mini-manipulationSimple structureBiological material testing proceduresStress based microorganism growth stimulationCoil arrayPhoto damage
The invention relates to a bio-particle three-dimensional manipulation device based on a coil in the technical field of life science. The device comprises a paramagnetism solution, a chamber and a chip, wherein the chamber is internally provided with the paramagnetism solution, the chip is bonded with the chamber and the chip is photo-etched with a coil array. By using a magnetic Archimedes effect and adopting a manipulation chip formed and assembled by an MEMS (Micro-Electro-Mechanical System) process, the invention has simple integral structure and easy manipulation, and can realize bio-particle micro-manipulation in a non-contact way without mechanical or photo damages under common magnetic field environment at normal temperature.
Owner:SHANGHAI JIAO TONG UNIV
Novel cone lens generating single bottle beam
The invention discloses a novel cone lens generating a single bottle beam, which is an axicon, wherein a concave circular truncated cone structure is formed at the bottom of the axicon, and the bottom angle of the circular truncated cone structure is less than that of the axicon. The novel cone lens can acquire the single bottle beam through one element, has the advantages of relatively easy element processing, simple structure, high conversion efficiency and high photo damage threshold, and provides a novel concise and efficient way for acquiring the bottle beam; furthermore, the size of the single bottle beam can be adjusted by adjusting the size of the bottom angle or the inner bottom radius of the circular truncated cone structure. In practical application, the novel cone lens can be used as laser conduits, optical tweezers, optical wrenches and other tools, and can be used for confining microscopic particles, neutral atoms, molecules, biological cells and the like by laser, thus has special significance in life science and nano-technology, in particular single-plane and multi-plane manipulation on microparticles.
Owner:HUAQIAO UNIVERSITY
Photo damage resistance gel containing salidroside
InactiveCN104606066AImprove absorption rateImprove bioavailabilityCosmetic preparationsToilet preparationsSalidrosideWrinkle skin
The invention provides a photo damage resistance gel containing salidroside. A cosmetic contains 5-50 percent of a salidroside lipid nano-emulsion and is capable of resisting damages to skin caused by environment (such as ultraviolet rays and air pollution) except the effects of repairing, moisturizing, resisting wrinkle and refirming. According to the photo damage resistance gel, with the lipid nano-emulsion as a carrier of eliminating the salidroside, serving as the bioactive components of free radicals in vivo, the absorption ratio of skin to the salidroside and the bioavailability of hydrophilic molecules are remarkably increased; with the combination of the salidroside lipid nano-emulsion, a non-bioactive sun-screening agent and a whitening agent, damage of the free radicals to the skin is effectively eliminated while the skin is protected from ultraviolet radiation, and the purposes of protecting the skin and resisting photo damage are achieved.
Owner:SHENZHEN AESTHETIC BIOLOGICAL TECH +1
Method For Fabricating Semiconductor Package
InactiveCN103811360AAvoid destructionSmooth processSemiconductor/solid-state device detailsSolid-state devicesSemiconductor chipSemiconductor package
A method for fabricating a semiconductor package is disclosed, which includes the steps of: providing a carrier having a release layer and an adhesive layer sequentially formed thereon; disposing a plurality of semiconductor chips on the adhesive layer; forming an encapsulant on the adhesive layer for encapsulating the semiconductor chips; disposing a substrate on the encapsulant; exposing the release layer to light through the carrier so as to remove the release layer and the carrier; and then removing the adhesive layer, thereby effectively preventing the semiconductor chips from being exposed to light so as to avoid any photo damage to the semiconductor chips.
Owner:SILICONWARE PRECISION IND CO LTD
Active Sunscreen Composition
InactiveUS20100021400A1Prevents DNA damageInduces DNA repairCosmetic preparationsToilet preparationsChemical compositionFluorescence
The invention relates to topical compositions comprising a fluorescent dye that absorbs UVA and UVB radiation and converts it into a healing light, in combination with a dermatologically acceptable excipient. The compositions of the invention are useful for repairing photo-damaged skin cells and reducing or preventing future skin damage as a result of exposure to UV light.
Owner:RHODE ISLAND HOSPITAL
Chiral complexes of ascorbic acid with natural antioxidant and anti-inflammatory ketones including aloe, citrus, ginger, and mango for skin and hair care
This invention relates to certain complexes of ascorbic acid and its derivatives with certain natural antioxidant and anti-inflammatory ketones for topical or oral application; said complexes having general chemical formula (I), its isomers, and salts thereof, including their optically active or racemic forms. This invention also relates to a method of treatment of skin condition, including dark skin, age spots, acne, inflammation, loss of cellular antioxidants, collagen loss with aging, loss of skin pliability, loss of skin suppleness, skin wrinkles, oxidation, damage from radiation, malfunction of matrix metalloproteases, malfunction of tyrosinases, damage from free radicals, photo-damage, nutritional deficiency, and combinations thereof;
Owner:ISLAND KINETICS
Double-doped lithium niobate crystal and preparation method thereof
InactiveCN102321918AHigh power outputShort wavelength outputPolycrystalline material growthBy pulling from meltIon distributionUltraviolet lights
The invention relates to the technical field of photoelectric crystals, and especially relates to a double-doped lithium niobate crystal which comprises SmxMy(Li0.946NbO3)100-x-y, wherein M is one of Mg and Zn; 0.15<=x<=0.3; when M is Mg, 5<=y<=8; when M is Zn, 6<=y<=7. In the double-doped lithium niobate crystal of the invention, rare earth ion samarium Sm adopts lithium niobate doped with photorefraction-resistant ion Mg or Zn as a substrate, not only has high photo damage resistance, but also realizes short-wavelength orange red light output; with the excitation of ultraviolet light, Sm realizes the output of orange red light of 606 nm and 613 nm within a visible light wave band directly in a down-conversion manner, realizes the high-power output of orange red visible light. The invention also relates to a preparation method of the double-doped lithium niobate crystal, and the prepared high-quality double-doped lithium niobate crystal has no macroscopic defect, no obvious growth striation, and uniform distribution of the doped ions.
Owner:SUN YAT SEN UNIV
Ascorbic Acid Complexes for Skin Care Including Treatment of Dark Skin & Wrinkles
This invention relates to certain complexes of ascorbic acid and its derivatives with certain aryl alkyl ketones; said complexes having being formed via a kinetically-controlled process, and having general chemical formula (I) in FIG. 1. Said complexes can be in their various optically active or racemic forms. This invention also relates to a method of treatment of skin condition, including dark skin, age spots, acne, inflammation, loss of cellular antioxidants, collagen loss with aging, loss of skin pliability, loss of skin suppleness, skin wrinkles, oxidation, damage from radiation, malfunction of matrix metalloproteases, malfunction of tyrosinases, damage from free radicals, photo-damage, and combinations thereof; [FIG. 1].
Owner:BIODERM RES
Modular flow cytometry systems and methods of processing samples
Modular flow cytometry systems and methods for processing samples are described herein. The systems include automated or semi-automated modules that are replaceable and removable. A sample pathway module may be removed and placed in a microfluidic device cleaning module for cleaning, and then reinstalled or stored for later use. The systems further include optical modules, electronics modules, and mixing and collection modules. The optical module includes a photo-damaging assembly and detection laser assembly that may be on the same side relative to a plane or surface of a flow cytometry device and opposite of a detection assembly. The laser beam may have a beam waist that is wider in a direction perpendicular to a flow direction than in the flow direction. The mixing and collection module can automatically mix a sample being collected in a sample tube and switch to another sample tube when the other tube is full.
Owner:ABS GLOBAL
Topical Compositions Comprising An Alkoxylated Diphenylacrylate Compound And An Organic Nonionic Emulsifier
InactiveUS20120201766A1Effective dispersionCosmetic preparationsBiocideChemical compositionSunscreen agents
A topical composition of improved spreadability and aesthetical appeal is provided, which contains a stable emulsion base formed by combining an alkoxylated diphenylacrylate compound and a nonionic organic emulsifier with a pharmaceutically or cosmetically acceptable carrier. Preferably, the topical composition is a sunscreen composition that further contains inorganic or physical sunscreen agents dispersed in such a stable emulsion base, which is characterized by improved photo-protection of the skin and is effective in preventing / reducing photo-damage of the skin upon exposure to sunlight or other sources of light in the ultraviolet (UV), visible, and infrared (IR) ranges.
Owner:ELC MANAGEMENT LLC
Mg, Hf and Fe three-doping lithium niobate crystal and method for preparing the same
InactiveCN101327955AImprove resistance to photodamageShort response timePolycrystalline material growthNiobium compoundsCzochralski methodPhoto damage
The invention relates to a Mg, Hf and Fe tri-doped lithium niobate crystal and the method for preparing the same. The method solves the problems that the response time is slow and the photo damage resistance ability is low in the Fe doped lithium niobate crystal prepared by the prior art. The Mg, Hf and Fe tri-doped lithium niobate crystal is prepared by Li2CO3, Nb2O5, Fe2O3, MgO and HfO2. The method comprises the following steps: (1) weighing up the required components; (2) sintering the components; (3) growing the crystal by czochralski method; (4) obtaining the Mg, Hf and Fe tri-doped lithium niobate crystal by polarization treatment. The method obviously improves the photo damage resistance ability of the lithium niobate crystal and reduces the response time based on maintaining the original excellent performance of the lithium niobate crystal because of doping elements Mg, Hf and Fe in the lithium niobate crystal.
Owner:HARBIN INST OF TECH
Method and device for identifying laser damage of optical thin film based on polarization parameters
ActiveCN111474182AImprove discrimination accuracyAchieve integrationPolarisation-affecting propertiesOptically investigating flaws/contaminationOptical thin filmPolarizer
The invention relates to a method and a device for identifying laser damage of an optical thin film based on polarization parameters. The method and the device overcome phenomenon of 'erroneous judgment' frequently caused by judging whether the thin film is damaged or not in the prior art, are suitable for on-line judgment of surface damage of various optical elements and coating elements in laserdamage threshold measurement, and have the characteristics of rapidness and accuracy. The device comprises a two-dimensional workbench for mounting a thin film test sample, an incident light path anda reflection light path are arranged on the two sides of the two-dimensional workbench respectively, a light source, an optical filter, a collimator and a polarizer are sequentially arranged on one side of the incident light path, a wave plate, a polarization analyzer and a photoelectric receiver are sequentially arranged on one side of the reflection light path, a laser emitting end of a high-energy laser directly faces the surface of the thin film test sample, an attenuator and a convergent lens are sequentially arranged in the laser pulse output direction of the high-energy laser, and thetwo-dimensional workbench, the wave plate, the polarization analyzer, the high-energy laser, the receiver and the attenuator are all connected to an industrial control computer.
Owner:XIAN TECHNOLOGICAL UNIV
Compositions and methods for the treatment of skin
InactiveUS20080125395A1Less irritatingComposition is stableBiocideInorganic active ingredientsAminosugarInflammatory dermatosis
An ascorbic acid-based composition and related method for the treatment of aging, photo-damaged or inflamed skin is disclosed. The composition includes water and ascorbic acid, at least a portion of which has generally been pretreated by being dissolved under relatively high temperature and concentration conditions. The composition typically includes at least about 5.0% (w / v) ascorbic acid formulated to have a pH above 3.5. 10 to 50% of the ascorbic acid is pretreated ascorbic acid. The composition may also include a non-toxic zinc salt, a tyrosine compound, and / or pharmaceutically acceptable carrier. The composition may include an anti-inflammatory compound, such as aminosugar and / or sulfur-containing anti-inflammatory compound. Embodiments containing an aminosugar such as glucosamine are further useful for treating rosacea and other inflammatory skin ailments. The composition may be administered in a variety of forms suitable for topical application on skin.
Owner:BIODERM
Laser damage threshold and nonlinear absorption co-target-surface measuring device and method
ActiveCN112595493AFacilitates the establishment of spatial relationships of laser damageTesting optical propertiesBeam splitterLight spot
The invention discloses a laser damage threshold and nonlinear absorption co-target-surface measuring device and method. The device comprises an ultrafast laser, an adjustable attenuation sheet, a shutter, a focusing lens, a first spectroscope, a first photoelectric detector, a to-be-measured sample, an electric control displacement table, a second spectroscope, a second photoelectric detector, abeam expander set, a CCD camera, a computer and a light beam quality analyzer, wherein the adjustable attenuation sheet, the shutter, the focusing lens, the first spectroscope, the to-be-measured sample, the second spectroscope, the beam expander set and the CCD camera are sequentially arranged in the laser output direction of the laser device; and the effective area of the laser focus is measuredby adopting the beam quality analyzer. In addition, the same focusing light field and image transmission method are adopted, it is ensured that a light source causing sample damage and a light sourceexciting sample nonlinear absorption have completely equal target surface light spot distribution, and the relation between laser damage and sample nonlinear absorption is further analyzed conveniently.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Topical Compositions Comprising An Alkoxylated Diphenylacrylate Compound And An Aryl Carboxylic Ester
A topical composition containing an alkoxylated diphenylacrylate compound and an aryl carboxylic ester is provided. Preferably, the topical composition is a sunscreen composition containing α-ethylhexyl α-cyano-β-(4-methoxyphenyl)-β-phenylacrylate and 2-phenylethyl benzoate, and optionally further containing 4,4′-t-butyl methoxydibenzoylmethane, which is characterized by improved photo-protection of the skin and is effective in preventing / reducing photo-damage of the skin upon exposure to sunlight or other sources of light in the ultraviolet (UV), visible, and infrared (IR) ranges.
Owner:ELC MANAGEMENT LLC
Collagen polypeptide skin photo-damage repairing film and preparation method thereof
InactiveCN104490850AFacilitated releaseIncrease diversityOrganic active ingredientsPeptide/protein ingredientsAntioxidantBiocompatibility Testing
The invention relates to a preparation method of a collagen polypeptide skin photo-damage repairing film, and belongs to the field of biomedical materials. According to the collagen polypeptide skin photo-damage repairing film disclosed by the invention, the basic framework structure of the film is formed by collagen polypeptide, sodium carboxymethylcellulose, glutaraldehyde and starch, glycerol is added as a moisturizer to control the moisture of the film, and antioxidants of ganoderma lucidum polysaccharides, mushroom polysaccharides, lycium barbarum polysaccharides and the like are added; finally the uniformly mixed pasty mixed solution is poured in a die and formed, and dried in an oven at a constant temperature; and the collagen polypeptide skin photo-damage repairing film with good biocompatibility and oxidation resistance is obtained after being uncovered.
Owner:SICHUAN NORMAL UNIVERSITY
Thulium-doped gain fiber and fiber laser
ActiveCN109283614AEasy to prepareLight damage is smallGlass optical fibreGlass making apparatusRare earthLight beam
The invention provides a rare earth doped gain fiber and a fiber laser oscillator. According to the thulium-doped gain fiber and the fiber laser, a low-doping thermally conductive channel is established in the optical fiber by utilizing the mechanism in which the thermal conductivity of the material increases as the concentration of the doped ions decreases, thereby accelerating the heat dissipation to prevent heat from accumulating in the center of the core, and effectively preventing the generation of thermal lens effects and reducing photo damage to materials, which improves the output beamquality and the output power; and the preparation method of the core is simple and easy to implement.
Owner:JOINTO TECH CO LTD
Cultivation method of actinidia kolomikta
InactiveCN107231984AAvoid destructionDefects against photodamageCultivating equipmentsPlant protective coveringsFruit treeKiwi
The invention relates to the field of fruit tree cultivation, in particular to a cultivation method of actinidia kolomikta. When leaves of the actinidia kolomikta start to go red, 5%-15% of shading net is adopted for shading. On the basis of determining the colored leaf occurrence space and time rule, the method aims at the situation that the photo damage phenomenon of color leaves is likely to happen at the development later stage, so that the leaf photosynthesis efficiency is affected. The method is characterized in that the occurrence period and the occurrence position of the color leaves of the actinidia kolomikta are investigated for the first time, on the basis of understanding the occurrence rule of the colored leaves, the photosynthesis efficiency of the colored leaves under different shading degree conditions is measured from the perspectives of the photosynthetic rate and the photochemical activity through shading in the key period when photo damage is likely to happen, the shading degree through which photo damage of the colored leaves can be avoided and the photosynthetic rate cannot be reduced is screened out, therefore, the high photosynthesis efficiency of the colored leaves can be kept within the whole growth period, and it is avoided that photo damage of the colored leaves is generated, so that the leaf photosynthesis efficiency is seriously reduced and even lost.
Owner:INST OF SPECIAL ANIMAL & PLANT SCI OF CAAS
Poling method for relaxor ferroelectric single crystal as nonlinear optical material
ActiveCN107326443AReduces the possibility of crackingGood optical performancePolycrystalline material growthAfter-treatment detailsSingle crystalSlow cooling
The invention discloses a poling method for a relaxor ferroelectric single crystal as a nonlinear optical material. The method comprises an annealing process and a polarization process; the relaxor ferroelectric single crystal comprises a binary (1-x)Pb(Mg1 / 3Nb2 / 3)O(3-x)PbTiO3 system and a ternary (1-x-y)Pb(In1 / 2Nb1 / 2)O(3-x)Pb(Mg1 / 3Nb2 / 3)O(3-y)PbTiO3 system; according to the annealing process, the relaxor ferroelectric single crystal after grinding and polishing is subjected to annealing treatment in atmosphere, stress caused by machining is removed, and spontaneous strain produced in a ferroelectric phase forming process is released to the great degree through quite slow cooling, so that the probability of cracking caused by electrically induced domain rotation in the crystal poling process is reduced. Besides, after an electric field is removed, a remaining depolarization field can be induced to form a nanometer domain structure. In order to guarantee formation and stability of a single-domain structure, the remaining depolarization field can be compensated by bulk shielding effect formed through electrode injection, the relaxor ferroelectric single crystal with high poling performance and stable performance is obtained, and the material has the characteristics of small half-wave voltage, large photo damage threshold, large electro-optic coefficient and the like and is far better than BBO, KTP, LN and other materials.
Owner:XI AN JIAOTONG UNIV
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