13 results about "Potassium titanyl phosphate" patented technology

The application discloses a preparation method of a periodic domain erasing structure element based on a potassium titanyl phosphate crystal and a product thereof, and the method comprises the following steps: a femtosecond laser strip-shaped light beam is used to vertically irradiate the potassium titanyl phosphate crystal along the z direction of the crystal, the ferroelectric domain of the femtosecond laser irradiation area is erased, and a domain erasing structure is generated; the femtosecond laser irradiation area is translated along the y direction of the potassium titanyl phosphate crystal, and a periodic domain erasing structure arranged along the y direction is obtained; the near-surface of the potassium titanyl phosphate crystal is ablated based on the femtosecond laser, and two air grooves which are parallel and penetrate through the periodic domain erasing structure are prepared; S3. Based on the air grooves, a waveguide region of a ridge waveguide is obtained; the two end faces perpendicular to the y direction of the crystal are subjected to optical polishing treatment, and finally, the potassium titanyl phosphate crystal periodic domain erasing structure element is obtained. The application can realize more rapid and efficient preparation of a periodic domain structure and nonlinear frequency conversion under a specific wavelength.

The invention discloses an efficient potassium titanyl phosphate crystal polishing solution as well as a preparation method and a polishing method thereof. The cleaning agent is prepared from raw materials in percentage by weight as follows: 5%-15% of colloidal silicon dioxide, 0.1%-1% of a chelating agent, 0.5%-3.0% of an oxidizing agent, 0.01%-0.1% of a surfactant and the balance of deionized water. The pH regulator is added after the raw materials are mixed, and the mixed solution is regulated to be weakly acidic. The efficient potassium titanyl phosphate crystal polishing solution is scientific in composition proportion, and the problems that in the prior art, potassium titanyl phosphate crystals are low in polishing efficiency, poor in surface quality and the like can be solved.

The application provides a slow-release device, a rubidium-titanium potassium phosphate oxide crystal and a preparation method thereof, and belongs to the technical field of electro-optic crystals and nonlinear optical crystals. The application provides a slow-release device, which comprises a hollow inner tube and a hollow outer tube sleeved outside the hollow inner tube; the hollow inner tube and the hollow outer tube are both closed structures provided with slow-release holes at the top; the diameter of the slow-release hole is 0.3-3 mm. The slow-release device provided by the application can avoid crystal cracking, and the prepared rubidium-titanium potassium phosphate oxide crystal has the advantages of high resistivity and uniform resistivity distribution.

The invention provides a slow release device, a rubidium-potassium titanyl phosphate crystal and a preparation method of the rubidium-potassium titanyl phosphate crystal, and belongs to the technical field of electro-optical crystals and nonlinear optical crystals. The invention provides a slow release device. The slow release device comprises a hollow inner pipe and a hollow outer pipe arranged outside the hollow inner pipe in a sleeving mode. The hollow inner pipe and the hollow outer pipe are each of a closed structure with slow release holes formed in the top. And the diameter of each slow release hole is 0.3 to 3mm. By adopting the slow release device provided by the invention, crystal cracking can be avoided, the prepared rubidium-potassium titanyl phosphate crystal has the advantage of high resistivity, and meanwhile, the resistivity distribution is uniform.

This invention discloses a method for growing potassium titanate oxyphosphate crystals based on a low-viscosity co-solvent, belonging to the field of artificial crystal technology. Addressing the problem of low growth rates caused by high co-solvent viscosity and slow solute transport during existing potassium titanate oxyphosphate crystal growth processes, this invention provides a rapid growth process based on a low-viscosity co-solvent. The growth method of this invention includes: mixing the solute required for crystal growth with a co-solvent, heating and melting to form a growth melt; wherein the co-solvent contains a low-viscosity regulator, ensuring that the viscosity of the growth melt at the crystal growth temperature is ≤5 mPa·s; and then using a top-seeded crystal method for crystal growth. This invention significantly improves the diffusion rate of the solute in the melt by reducing the viscosity of the co-solvent system, thereby increasing the growth rate of potassium titanate oxyphosphate crystals to 1.5-2.5 mm / day, which is 2 to 3 times that of traditional methods. Simultaneously, it effectively suppresses the formation of inclusions, resulting in large-size potassium titanate oxyphosphate crystals with high optical quality. This method is stable, has a short cycle time, and is beneficial for industrial production.

The application relates to a preparation method of an entangled light source based on a grating and a perfect vortex super surface, which comprises the following steps: providing a Gaussian light beam, linearly polarizing the Gaussian light beam along a specific polarization direction, and then generating signal light and idle light through a periodical polarization potassium titanyl phosphate crystal; collimating the photons, changing the polarization states of the signal light and the idle light through a 1 / 4 wave plate, and converting the signal light and the idle light into right-handed and left-handed circular polarizations respectively; making the Gaussian light beam pass through a perfect vortex super surface to obtain a spatially-varying geometric phase; then passing through a one-dimensional grating, and separating the right-handed and left-handed perfect vortex lights to output an overlapping part of an entangled state; and coupling the photons in the two paths into optical fibers respectively, and transmitting the photons to single-photon detectors to record coincidence numbers.

The invention belongs to the technical field of crystal growth, and particularly discloses a potassium titanyl phosphate crystal growing furnace and a control method thereof.The method comprises the steps that a seed crystal rotating rod is driven by a direct-current motor to achieve constant rotation, and the perpendicularity of the seed crystal rotating rod is dynamically corrected through a ball structure in a connecting base; the precise lifting of the seed crystal rotating rod is realized by utilizing gear meshing transmission and screw rod adjusting functions in the lifting device; the temperature distribution in the furnace barrel is monitored in real time through a temperature sensor, and the heating power is adjusted by combining a PLC control system and based on a PID algorithm so as to maintain the solution uniformity; adjusting the rotating speed of the direct-current motor according to a voltage signal output by the potentiometer to ensure that the rotating speed of the seed crystal rotating rod is matched with the pulling rate; the invention aims to solve the problems that in the prior art, the vertical precision of a seed crystal rotating rod is difficult to guarantee during crystal growth, the pulling process is unstable, and the solution uniformity is difficult to maintain in a high-temperature environment.

The application provides a preparation method of a potassium titanyl phosphate (KTP) ceramic target. The core is that the powder obtained by grinding KTP crystals is sintered under heating and pressure to successfully prepare a dense and uniform polycrystalline KTP ceramic target. The main steps are as follows: first, the KTP crystals are ball milled into powder, which is sieved after grinding, then the binder polyvinyl alcohol (PVA) is added and put into a sintering furnace device for sintering to successfully prepare a dense and uniform polycrystalline KTP ceramic target. The technical path is provided for the preparation of the KTP target and the subsequent preparation of the KTP thin film.

The utility model relates to an optical curing type Sagnac ring and a compact entanglement source, and belongs to the technical field of quantum information. The compact entanglement source comprises a fixed bottom plate, a collimator, a filter, a dichroscope, a first polarization beam splitter prism, a first half-wave plate, a first reflector, a second reflector, a periodically poled potassium titanyl phosphate crystal, a first spherical lens, a second spherical lens, a third spherical lens and a fourth spherical lens, according to the optical curing type Sagnac ring formed by the above devices, the optical element is permanently fixed on the bottom plate through a high-precision optical bonding technology, the influence of mechanical vibration of the surrounding environment on the precision of the Sagnac type entanglement source can be greatly reduced, frequent maintenance of the entanglement source is avoided, and the space occupation of the Sagnac type entanglement source system is effectively reduced. In conclusion, the stability of the Sagnac type entanglement source system is improved, and a foundation is laid for a miniaturized device-independent quantum random number generator.

The invention provides an entangled light quantum imaging method based on coincidence count correction in a rainfall environment. The method comprises the following steps: firstly, pumping a periodically poled potassium titanyl phosphate crystal by using 405nm pump light to generate 810nm entangled photon pairs, and separating the 810nm entangled photon pairs into signal light and reference light; the signal light passes through a rainfall area to irradiate a target, and the reference light is scanned by a digital micromirror device. Then, for photon scattering and time broadening effects caused by rainfall, constructing a Monte Carlo photon tracking model, and counting a signal photon space reachable probability; thirdly, correcting the additional optical path in the raindrop based on the Cauty-Crofton theorem, converting the additional optical path into time delay, and introducing a time matching efficiency factor; and finally, establishing a coincidence count correction model in combination with geometric and time constraints, and obtaining a coincidence count value of each pixel through the model and mapping the coincidence count value into a grayscale image. According to the method, imaging degradation caused by rainfall can be effectively inhibited, so that the recovery quality and robustness of quantum imaging under severe weather conditions are improved.

The present application relates to a kind of vanadium iodate second-order nonlinear optical crystal material and its preparation and application, the chemical formula is VO2 (H2O) (IO3), molecular weight is 275.86, belongs to orthorhombic system, its space group is Pca21, cell parameter is α=β=γ=90 °, Z=4, cell volume is The vanadium iodate crystal material of the present application has excellent second-order nonlinear optical performance, under 1200nm laser irradiation, powder frequency doubling intensity is about 18.0 times of potassium dihydrogen phosphate crystal (KDP), under 2100nm laser irradiation, powder frequency doubling intensity is about 1.5 times of potassium titanyl phosphate (KTP), and phase matching can be realized.In addition, vanadium iodate crystal material also has large birefringence, reaches 0.184 at 546nm.The above research results show that the crystal has wide application prospect in the field of laser frequency conversion, photoelectric modulation, laser signal holographic storage etc..

A method for generating a pulsed high-repetition-rate narrow spectral bandwidth light to excite chemical species in a defined space includes inputting light from a first laser into an optical cavity having an input coupling mirror and an output coupling mirror disposed at a predetermined distance away from each other and a first crystal disposed therebetween, the first crystal being defined by i) a first cut angle, and ii) a first rotational disposition which together change the first wavelength of the input first laser to a second wavelength, mixing a mixing light at a mixing wavelength with the light at the second wavelength, thus generating an output light, and outputting light at the output wavelength out of the optical cavity at a predetermined power level to a defined space having chemical species or particles therein.

The invention discloses a method for generating photo-induced petitliter hydrated liquid drops through serial splitting. According to the method, a space electric field generated by focusing laser to irradiate potassium titanyl phosphate (KPT) acts on a liquid drop forming process in microfluid emulsification in a cross-shaped channel, so that hydrated liquid drops are actively split and generated at a shearing opening of the microchannel. And moreover, by changing the irradiation time of the focused laser at the shearing opening of the cross-shaped channel, the volume of the emulsified liquid drops can be effectively reduced in a delayed manner. In addition, by adjusting the laser irradiation light intensity, the number of emulsion droplets generated by splitting can be effectively controlled. The method is of great significance to research and development of integration of micro droplet chips and photonics chips.