40results about How to "High electro-optic coefficient" patented technology

The invention discloses a high-speed wavelength tuning laser made of lithium niobate material. The laser comprises a lithium niobate thin film chip (i.e. LNOI chip); a first spot size converter (SSC)arranged on the lithium niobate thin film chip; and a composite resonant cavity connected with the first spot size converter, wherein the composite resonant cavity adopts the lithium niobate material.The composite resonant cavity adopts the lithium niobate material and has good electro-optic effect. The electro-optic coefficient r33 of the X-cut lithium niobate thin film can reach 30.8 pm/V whenthe optical mode propagates along the y direction and the electric field direction is the z direction. The wavelength tuning speed of the laser can reach ns level and the tuning range can be more than10nm so that the laser can be used in an optical switching network to reduce network congestion and enable information transmission to be faster.

The invention relates to a sodium bismuth titanate-barium titanate lead-free transparent electro-optic ceramic and a preparation method thereof; the electro-optic ceramic has the chemical composition of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3, wherein 0.05<=x<=0.08; the preparation method includes the steps: batching Na2CO3, Bi2O3, TiO2 and BaCO3 as raw materials according to the stoichiometric ratio, carrying out ball milling, and mixing evenly to obtain a powder; carrying out heat preservation on the powder for 2-4 h at the temperature of 850-950 DEG C, and thus obtaining a synthetic material; crushing the synthetic material, sieving, carrying out ball milling, adding a binder, and carrying out press molding to obtain a blank; next, placing the blank in a sintering furnace, heating up from room temperature to 800 DEG C-850 DEG C at the speed of 200 DEG C-250 DEG C/h, and carrying out heat preservation for 0.5-1.5 h; and heating up at the speed of 100 DEG C/h and gradually pressurizing to 200-250 MPa, followed by keeping the pressure unchanged, heating up to 1000 DEG C-1050 DEG C, then carrying out heat preservation for 2 h, then heating up to 1100 DEG C-1200 DEG C at the speed of 50 DEG C/h, carrying out heat and pressure preservation for 8-24 h, then releasing the pressure, cooling to 900 DEG C at the speed of 100 DEG C/h, and cooling to room temperature along with a furnace, wherein oxygen is introduced with the flow quantity of 3-5 L/minute when the heating is started and introduction of oxygen is stopped when the pressure is released.

The invention provides an integrated optic chip for a three-axis fiber optic gyroscope, in which an input optical waveguide, a first direction coupler, a second direction coupler, a third direction coupler, an optical waveguide attenuator with a Mach-Zehnder structure, an output optical waveguide, a first Y-branch coupler, a second Y-branch coupler, a third Y-branch coupler and a designed metal electrode are integrated. The chip is prepared by low-loss organic polymer optical waveguide material and organic polymer electrooptical material. In comparison with a conventional discrete device optical system, a plurality of waveguide devices with key functions are uniformly integrated on the chip; the multifunctional chip can implement functions, such as modulation, attenuation, splitting, wave combination and the like, on light beams; and the multifunctional chip has the advantages of excellent consistency, high stability, low power, small volume, light weight and the like, and can be used for developing the three-axis fiber optic gyroscope.

In the method, ferroelectric nonocrystal is distributed uniformly in transparent film polymer as ferroelectric material is made from strontium barium niobate, lead zirconate titanate, lanthanum doped lead zirconate titanate, BaTiO3, LiNbO3, or LiTaO3 with nanocrystal particle diameter of 20-80 nm; polymer base material is made from polymethyl methyl acrylate, polycarbonate, polyimide sort and thermoplastic polyamic acid. The prepare process includes polymerizing ferroelectric nanocrystal in the polymer in polymerization procedure of dissolving nanocrystal and polymer in polar solvent and depositing film by soaking or spinning.

The invention discloses a rubidium lithium titanium germanate compound, a rubidium lithium titanium germanate non-linear optical crystal and preparation methods and application thereof. A chemical formula of the rubidium lithium titanium germanate compound is Rb4Li2TiGe4O13; a chemical formula of the rubidium lithium titanium germanate non-linear optical crystal is Rb4Li2TiGe4O13; the rubidium lithium titanium germanate non-linear optical crystal is non-centrosymmetrical structure, belongs to the tetragonal system and has a space group P4nc, is prepared by adopting a co-solvent method. The invention further discloses the rubidium lithium titanium germanate non-linear optical crystal to application of a laser non-linear optical compound functional device, an electro-optical crystal device or a laser device. The rubidium lithium titanium germanate non-linear optical crystal provided by the invention has a relatively great non-linear optical effect, a high electro-optical coefficient anda wide transmission range, has good mechanical properties and does not deliquesce; the frequency-doubled effect is 3 to 5 times of KDP (potassium dihydrogen phosphate).

The invention discloses an electro-optical polymer waveguide mode conversion switch for a mode multiplexing technology, and is applied to the field of optical communication. Aiming at the problems ofinsufficient stability, structure complexity, relatively slow conversion speed, insufficient working wavelength range and the like of an existing reconfigurable mode converter, a mode switch of voltage control and electric tuning is achieved by electro-optical effects of a long-period grating structure and an electro-optical polymer, and a novel electro-optical mode converter is constructed; and the device has the advantages of rapid conversion speed, low half-wave voltage, low cost and the like and has good actual application value.

The invention provides an organic optical non-linear chromophore based on a double-donor structure, and belongs to the field of optical materials, the chromophore has a structural formula shown in the abstract figure, OH groups are introduced into double donors of a second-order non-linear optical chromophore through nucleophilic reaction, and the chromophore has a structure shown in the description. The two OH groups connected to the donor end provide connection sites for further modification of the double donor, and ultraviolet absorption lambda max red shift and small band gap verify that the double donor group modified by the two OH groups has higher electron donor strength compared with the donors of most chromophores.