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

A high efficiency electro-optic dendrimer based technology for nanophotonic integrated circuit devices is presented. In particular, a high power terahertz (THz) source is implemented using an electro-optic dendrimer via electro-optic rectification. Electro-optic rectification provides inherent power scalability, because, pump-THz conversion is not limited either by emission saturation or by heat dissipation. Low dielectric loss and high electro-optic coefficient of dendrimer along with a waveguide structure provides higher output power and tunable THz power generation. A dendrimer fiber array is also disclosed by means of which the input / output signals are connected to multiple components and devices.

The present invention belongs to the field of optoelectronic communication and optical information treatment. In the modulator, upper metal film, photoelectric polymer film, isolating layer and lower metal film are plated successively onto the lower surface of the prism; the upper and the lower metal film and the photoelectric polymer film constitute double-sided metal coated waveguide structure; the prism, the upper metal film and the photoelectric polymer film constitute the attenuating total-reflection structure; and the excited guide wave propagates inside the photoelectric polymer film. The modulation method includes constituting the said modulator, using semiconductor laser as laser light source, producing guide wave resonance mode, looking for corresponding sync angle to make theincident angle of laser beam to the bottom of the prism equal to the sync angle, and receiving reflected laser beam with detector to realize multiplex light modulation.

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 an internal modulation terahertz source based on a waveguide structure and an internal modulation method thereof. The internal modulation terahertz source comprises a pumping source, a laser beam combiner, a coupler and a waveguide structure, all of which are sequentially arranged, wherein the pumping source is composed of two independent fiber lasers; the waveguide structure is formed by tightly adhering an organic electro-optical material cladding, a lithium niobate core layer and a quartz substrate from top to bottom through optical cement, a control circuit is arranged in the organic electro-optical material cladding, and a wedge-shaped structure is arranged on the outer side of the organic electro-optical material cladding. The refractive index of the organic electro-optical material cladding is modulated through the control circuit, so that waveguide structure internal modulation terahertz output is obtained; therefore, the higher core layer internal energy conversion efficiency is achieved, and the generated terahertz energy can be efficiently coupled and outputted. According to the internal modulation terahertz source based on the waveguide structure and the internal modulation method thereof, integrated optical modulated terahertz radiation with high efficiency and a simple and compact structure can be achieved, and the invention is suitable for subsequent application and research on the fields of wireless communication, imaging, radar and the like.

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 a (Bi1-x-yLnxCey)3TeBO9 compound, (Bi1-x-yLnxCey)3TeBO9 nonlinear optical crystal, (Bi1-x-yLnxCey)3TeBO9 scintillation crystal, a preparation method and an application thereof. The compound crystal with its chemical formula being Bi3TeBO9 is a non-centrosymmetrical structure and belongs to the hexagonal system, and space group is P63. The invention also discloses (Bi1-x-yLnxCey)3TeBO9 compound crystal doped with different rare earth elements, wherein Ln=La-Lu or Y; X is less than 1 and greater than or equal to 0; and Y=0 or Y is less than or equal to 0.2 and greater than or equal to 0.0001. By a flux method, high-quality and large-sized (Bi1-x-yLnxCey)3TeBO9 crystal can grow, has good mechanical property is good, is deliquescence-free, and can be used for manufacturing nonlinear optical devices. A laser manufactured by the use of the crystal can be used in fields of spectroscopy, biomedicine, military and the like. The material of the invention also can be used as high-density fast-attenuation scintillation crystal.

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.