32 results about "Potassium titanyl phosphate" patented technology

The invention relates to the non linear optical frequency conversion. To realize output of high power THz wave which can be continuously tuned, and stable running at room temperature, the technical scheme used by the invention is that: a tunable terahertz radiation source based on difference frequency cherenkov effect is composed of a laser device, a frequency doubling crystal, a double wavelength parametric oscillator, a harmonic mirror, a polarization filter, a combined beam mirror, a column lens and a difference frequency crystal; the harmonic mirror is placed between the frequency doubling crystal and the double wavelength parametric oscillator; the double wavelength parametric oscillator is II type phase matching KTP (Potassium Titanyl Phosphate) crystal OPO (Optical Parametric Oscillator); the polarization filter, the combined beam mirror and the column lens are arranged between the parametric oscillator and the difference frequency crystal; the difference frequency crystal is amagnesium oxide doped lithium niobate crystal with molecular formula of MgO:LiNbO3 or MgO:LN, and the generated THz wave is coupled and output by an Si prism on the side surface of the difference frequency crystal. The tunable terahertz radiation source based on difference frequency cherenkov effect is mainly applied to the optical frequency conversion.

A periodically poled second harmonic generating crystal having a long axis, said crystal comprising Magnesium Oxide doped Congruent Lithium Niobate, Magnesium Oxide doped Stoichiometric Lithium Niobate, Stoichiometric Lithium Tantalate or Potassium Titanyl Phosphate wherein the poling planes of said periodically poled crystal are canted relative to said axis and a doubled, external cavity laser utilizing said crystal, comprising an external cavity pump laser section and an extra-cavity frequency doubling section.

The invention discloses phase-shifters, modulators, and method that produces a smaller π by means of a field excitation using multiple electrodes. A negative signal is introduced that travels with the positive signal, which enhances the electric field significantly. The field enhancement is provided by the superposition of the fields accumulated from each electrode. A base or substrate material can be made from any compound having linear electro-optic properties, such as lithium niobate, lithium tantalite, potassium lithium niobate, potassium titanyl phosphate or gallium-arsenide. For lithium niobate, there are two possible orientations of electric field, z-cut orientation or x-cut orientation.

A method of optical communication in a well can include launching light having substantially coherent phase into an optical waveguide extending in a wellbore, modulating light having substantially coherent phase in the wellbore, and receiving the modulated light transmitted via the same optical waveguide. A well system can include at least one optical waveguide extending in a wellbore, and a downhole optical modulator which modulates light transmitted via the optical waveguide, the optical modulator comprising a potassium titanyl phosphate crystal. Another method of optical communication in a well can include launching light into an optical waveguide extending in a wellbore, the light launched into the optical waveguide having information modulated thereon using a carrier, modulating light in the wellbore, the modulating comprising modulating information using a subcarrier of the carrier, and transmitting the light modulated in the wellbore via the same optical waveguide.

The invention discloses a frequency doubling self-regulating Q green laser inside a double-doped chrome yttrium aluminum garnet composite photassium titanyl phosphate cavity,and relates to a green laser. The self-regulating Q green laser is provided with a pumping source, a micro lens, a first column-shaped lens, a second column-shaped lens and a laser working medium Cr, Nd:YAG/KTP composite crystal. The pumping source, a micro lens, the first column-shaped lens, the second column-shaped lens and the laser working medium Cr, Nd:YAG/KTP composite crystal sequentially are arrayed on a same plain shaft from front to back. Anti-reflection film and a high-reflective film are plated on the rear surface of the laser working medium Cr, Nd:YAG/KTP composite crystal to serve as a back cavity lens of the laser cavity. High-reflective film and anti-reflection film are plated on the front surface of the laser working medium Cr, Nd:YAG/KTP composite crystal of the laser cavity. The number of optical elements used for the laser is small, the production cost is low, the structure is simple and compact, and the laser is convenient to produce and assemble and operate and use by a non-professional person.

A non-linear optical crystal iodic acid vanadium potassium is characterized in that a chemical formula is K (VO2)2 (IO3)3, molecular weight is 729.68, the non-linear optical crystal iodic acid vanadium potassium belongs to an orthorhombic system and a space group Ima2, and unit cell parameters include that a=14.136 (3), b=10.201 (2), c=8.064 (1), alpha=beta=gamma=90 degrees, V=1162.8 (3) and Z=4. A hydrothermal method is adopted for preparation. The iodic acid vanadium potassium K (VO2)2(IO3)3 has good non-linear optical performance, and a second harmonic generation (SHG) coefficient of powder of the iodic acid vanadium potassium is 3.6 times that of potassium titanyl phosphate (KTP).

The invention relates to a method of preparing a potassium titanyl phosphate film by utilizing ion injection. The method comprises the following steps: respectively placing a potassium titanyl phosphate crystal into alcohol and acetone and carrying out ultrasonic cleaning treatment; injecting light ions-H ions or He ions with low energy into a potassium titanyl phosphate material at a normal temperature, wherein energy range of the injected ions is 100 keV-300 keV, the dosage range of the injected ions is 1*10<16> ions/square centimeter-10*10<16> ions/square centimeter; binding the material which is injected with light ions on a substrate by resin, or directly bonding the material which is injected with the light ions on the substrate, adhering an injection surface on the substrate; carrying out annealing treatment onto a sample. The method disclosed by the invention can be used for obtaining a single-crystal material with a better crystal lattice structure; moreover, the method is not high in requirements for a substrate material, and very easy for realization of binding.

The invention discloses a non-linear Cerenkov radiation light source based on doped optical superlattice. The non-linear Cerenkov radiation light source comprises a laser pumping source and an optical resonance cavity, wherein laser gain dielectric crystals in the optical resonance cavity are doped optical superlattice crystals; the doped optical superlattice crystals are non-linear crystals with one-dimensional or two-dimensional or three-dimensional periodic structures and are prepared by using lithium niobate or lithium tantalite or mg-doped lithium niobate or potassium titanyl phosphate or rubidium titanyl phosphate as a host material; and lanthanide ions or actinide element ions or transition metal ions are doped in the optical superlattice crystals as laser gain ions. Compared with the prior art, the non-linear Cerenkov radiation light source has the advantages that a Cerenkov type phase matching mode is used in a laser cavity with high integration degree, and requirements on conditions of working wavelength, temperature and the like are not severe, so that the environment tolerance on a system is high.

A thermal treatment process for improving the resistance of a flux grown, periodically poled KTiOPO₄ crystal to photorefractive or photochromic damage comprising the steps of: i) heating said crystal from ambient temperature up to an annealing temperature in the range of from about 200° C. to about 400° C.; ii) maintaining said crystal at said annealing temperature in an oxygen containing atmosphere; iii) allowing said crystal to slowly cool down from said annealing temperature to ambient temperature.

The invention discloses a photon pair source without spectral correlation. The photon pair source comprises a laser light source and a periodically poled potassium titanyl phosphate crystal, the periodically poled potassium titanyl phosphate crystal is a nonlinear crystal with II-type phase matching, and the periodically poled potassium titanyl phosphate crystal is used for generating photon pairswithout spectral correlation according to the parametric down-conversion process of laser emitted by the laser light source, wherein the polarization region of the II-type phase-matched periodicallypolarized potassium titanyl phosphate crystal is divided into a central region and two edge regions in the laser incident direction. By reasonably designing the duty ratio of the central region and the crystal length, the photon yield of the photon pair source is in Gaussian distribution, the problem of time distinguishability and the problem of spectrum distinguishability are solved, and the original brightness of photons is guaranteed while the photons are irrelevant to the spectrum. The photon pair source is convenient to adjust in practical application, high in integration level and easy to expand.

The invention relates to a negative electrode material for a potassium ion secondary battery. The active substance of the negative electrode material is potassium titanyl phosphate. The problems thata negative electrode material of an existing potassium ion battery is poor in circulation and rate performance, no stable charging and discharging platform is arranged, battery polarization is serious, and the charging and discharging coulombic efficiency is low are solved. The potassium titanyl phosphate negative electrode material can be directly used for a negative electrode of the secondary potassium ion battery. The battery assembled by the potassium titanyl phosphate negative electrode material and an electrolyte system is provided with a stable and high-safety charging and discharging voltage platform, and excellent electrochemical properties such as low battery overpotential polarization voltage and high charging and discharging coulombic efficiency.

The invention provides an all-solid-state dual-wavelength ultrafast laser, comprising a seed light source as well as a multi-pass amplifying module and a dual-wavelength switching module connected with the seed light source, wherein the multi-pass amplifying module comprises three 45-degree reflectors, a polarizer, four crystals, four faraday rotators, a 1/2 wave plate and two pumping sources; the dual-wavelength switching module comprises a 1/2 wave plate, a polarizer, a KTP (Potassium Titanyl Phosphate) crystal, a spectroscope, an ABS (Acrylonitrile Butadiene Styrene) absorber; an electromagnetic valve is arranged on the 1/2 wave plate, and an external control circuit controls the 1/2 wave plate via the electromagnetic valve to realize dual-wavelength external switching and control. The all-solid-state dual-wavelength ultrafast laser has the advantages: a dual-pumping module is adopted in the traditional scheme, and beams are transmitted single times in lean body weight, so the amplification factor is limited, whereas a multi-pass amplification technology is adopted in this scheme, energy can be effectively amplified multiple times, and the utilization rate of the energy can be imrpoved.

The invention relates to a rubidium molybdenum fluoride tellurite second-order nonlinear optical crystal material and preparation thereof, and application of rubidium molybdenum fluorine tellurite second-order nonlinear optical crystal material in laser frequency conversion. The chemical formula of the crystal material is RbTeMo2O8F; the molecular weight of the crystal material is 551.95; the crystal material belongs to a monoclinic system; the space group of the crystal material is Pn; the cell parameters of the crystal material are that a is equal to 5.55 to 5.73 angstroms, b is equal to 9.18 to 9.30 angstroms,c is equal to 7.44 to 7.57 angstroms, alpha is equal to gamma and equal to 90 degrees, beta is equal to 95.13 to 95.32, and Z is equal to 2; and the cell volume V of the crystal material is equal to 379.1 to 403.4 angstroms<3>.The rubidium molybdenum fluoride tellurite crystal material has excellent optical performance; under irradiation of laser with a wavelength of 1064 nm, the powder frequency doubling strength of the rubidium molybdenum fluoride tellurite crystal material is about 27 times the powder frequency doubling strength of a monopotassium phosphate crystal; and under laser with a wavelength of 2100 nm, the powder frequency doubling strength of the rubidium molybdenum fluoride tellurite crystal material is 2.2 times the powder frequency doubling strength of a potassium titanyl phosphate crystal. In addition, the crystal material has a wide transmission range in a visible light-infrared light region (0.34-5.4 [mu]m), and has wide application prospects in the fields of laser frequency conversion, photoelectric modulation, laser signal holographic storage and the like.

The invention relates to a technology for preparing a chemically mechanism polishing (CMP) solution in the high-precision surface processing of a KTiOPO4 (KTP for short) crystal. A nanometer SiO2 grinding material is selected, wherein the concentration of the grinding material is 30-50 percent by weight, and the grain size is 15-100nm. In the preparation process, a negative pressure stirring preparation method under a closed system is adopted, which avoids the pollution of organic matters, large particles, metal ions, and the like brought by traditional preparation methods of compounding, mechanical stirring, and the like and can achieve ultra-clean requirement. Since the stirring is carried out under a vortex state, the method can realize no agglomeration and no dissolution, especially at the bottom and the edge of a reactor, under the conditions of high concentration and high pH value of the nanometer SiO2 grinding material. The method has the advantages of low cost, low roughness degree, high speed, no environment pollution and no equipment corrosion.

The invention provides an underwater quantum distance measurement method based on starry sea light quantum link transmission. The method comprises the following steps: firstly, establishing a light quantum communication link by utilizing an aiming tracking technology, generating pump light through a laser on a satellite, enabling the pump light to enter a periodically poled potassium titanyl phosphate crystal, carrying out spontaneous parametric down-conversion to obtain signal light and idle light with entanglement characteristics, and respectively transmitting the signal light and the idle light to a sea surface station 1 and a sea surface station 2; using single-photon detectors of the two sea surface stations to receiving photons; secondly, enabling the sea surface station 1 to sink, enabling the sea surface station 2 to float on the sea surface, and tracking the position of the sea surface station 1; then, using a single-photon detector on the sea surface station 1 to emit photons to a target, and receiving the photons by the single-photon detector after the photons are reflected by the target; and finally, performing coincidence counting is performed on the time pulse sequences output by the single-photon detectors of the two sea surface stations by using a high-speed acquisition circuit, obtaining the flight time of the signal light, and further calculating the distance between the sea surface station 1 and the target.

The invention provides a low-overhead entangled light quantum target imaging method based on ranging assistance. High-speed target imaging is realized through two coincidence counting operations. The method comprises the following steps: firstly, modulating pump light generated by a laser by using a lens combination and a wave plate combination, and improving the spontaneous parametric down-conversion efficiency of a periodically poled potassium titanyl phosphate (PPKTP) crystal; then, a digital micromirror device (DMD) is controlled to select a local ranging pixel area, and a time pulse difference value sequence about photons collected by the barrel detector and the surface detector is constructed; secondly, completing local coincidence counting by using the time pulse difference sequence to obtain a time difference between a signal light path and a reference light path; thirdly, the DMD is controlled to select a global imaging pixel area, the time pulse sequence obtained by the barrel detector is corrected, and the corrected time pulse sequence is utilized to complete global coincidence counting; and finally, mapping the coincidence count value and the gray value to obtain a quantum gray imaging result of the target.

The invention belongs to the technical field of sodium/potassium ion batteries. The invention particularly relates to a potassium titanyl phosphate film negative electrode material as well as a preparation method and application thereof. A titanium substrate is used as a current collector; a potassium titanyl phosphate (with the chemical formula of KTiOPO4) film growing on the titanium substrate serves as an active material, the mass fraction of the active material is 100%, the potassium titanyl phosphate film has excellent flexibility, potassium titanyl phosphate nanowires form an almond-shaped microstructure, and gaps exist between the nanowires. The method is simple in process preparation, high in repeatability, low in energy consumption and low in cost, and has important significance in research of a flexible sodium/potassium ion battery negative electrode material; meanwhile, large-area uniform growth of the potassium titanyl phosphate film on the titanium substrate can be achieved, and industrial application is facilitated. In addition, the material grown in situ on the metal substrate by the one-step hydrothermal method can also be applied to the synthesis of other materials.

The invention provides a light quantum coincidence counting positioning method based on a time delay relative error. The method comprises the following steps: firstly, enabling continuous pump light generated by a laser to pass through a half-wave plate and a polarization beam splitter to form linearly polarized light, and irradiating the linearly polarized light to a periodically poled potassium titanyl phosphate (KTP) crystal to generate reference light and signal light; secondly, directly receiving the reference light by a local single-photon detector, transmitting the signal light to a target to be detected, reflecting the signal light to the local, receiving the signal light by another single-photon detector, calculating the photon loss rate of a signal light time pulse sequence in each light source, and performing dynamic grouping; thirdly, coincidence counting is conducted on the time pulse sequence, a second-order correlation function curve of the light is obtained, and a time delay value corresponding to the peak value of the second-order correlation function curve serves as the flight time difference of the signal light and the reference light; and finally, aiming at the time delay value obtained by coincidence counting, calculating the time delay relative error of other groups, and dynamically selecting the light source with smaller time delay relative error for positioning.