51 results about "Biaxial crystal" patented technology

A polarized interference recycling backlight module for generating light with a single polarization state, which reduces the optical loss in light beam output, is suitable for mass production, and decreases manufacturing costs, is disclosed. The backlight is easily integrated with conventional electro-optical display devices and achieves high-quality polarization. The polarized interference recycling backlight module according to the present invention comprises an optical cavity and interference polar (I-Polar) composed of stacked layers. At least one layer of said I-Polar is optically anisotropic and is made by means of Cascade Crystallization Process, is characterized by a globally ordered biaxial crystalline structure with an intermolecular spacing of 3.4±0.3 Å in the direction of one of optical axes, is transparent in the visible spectral range, and is formed by rodlike supramolecules representing at least one polycyclic organic compound with a conjugated π-system and ionogenic groups. Another aspect of the present invention is a liquid crystal display incorporating the polarized interference recycling backlight module.

The invention relates to a resonant cavity capable of obtaining hollow laser beams, which can directly output hollow conical laser beams, belonging to the field of laser technology. The current technology for obtaining the hollow laser beams uses an optical device outside the resonant cavity for reshaping the laser beams emitted by the resonant cavity to obtain the hollow laser beams, and the scheme not only has a complex structure, but also has large energy loss. The resonant cavity capable of obtaining the hollow laser beams of the invention comprises a reflector, a laser gain medium and an output coupling mirror, wherein the material of the output coupling mirror is biaxial crystal, and one optical axis of the biaxial crystal is parallel to the axial line of the resonant cavity.

A method and an apparatus serve to produce thin films having a biaxial crystal orientation. The method includes the steps of: depositing atoms on a substrate, the atoms having a composition corresponding to the thin film to be produced; bombarding the deposited atoms with an energized beam, the energized beam being oriented with respect to the substrate at an angle of a defined range of angles, the step of bombarding substantially taking place during a different time period than the step of depositing; and alternately repeating the step of depositing and the step of bombarding for a plurality of times.

Walk-off corrected (WOC) non-linear optical (NLO) components, devices and systems including one or more engineered WOC NLO crystal doublets. Such systems and devices advantageously increase the efficiency of an OPO operation. Devices are applicable to any uniaxial and biaxial NLO crystals in a wide range of wavelengths, e.g., from far ultraviolet to visible to far infrared. Devices employing engineered WOC NLO components according to embodiments of the present invention include any conventional frequency converting architectures. Systems and methods are also provided to unambiguously determine and correct walk-off for any arbitrary uniaxial and biaxial crystal orientation. The correct crystal orientation is also experimentally confirmed. This allows the use of WOC crystal doublet assemblies for a wide range of wavelengths and NLO crystals that until now have not been used because of low efficiency due to walk-off and inability of readily correcting walk-off.

A multichannel optical fiber rotary connector achieving conical refraction comprises a rotor and a demultiplexing system. The rotor is arranged in a stator sleeve through a bearing. The demultiplexing system is composed of a demultiplexer sleeve connected with the output end of the stator sleeve, a demultiplexer arranged in the demultiplexer sleeve, and an output collimator arranged at the output end of the demultiplexer sleeve. The output end of the rotor is provided with two to twenty input optical fiber collimators. A biaxial crystal is arranged in the stator sleeve and corresponds to the light output end of each input optical fiber collimator. A convergent lens or a lens set is embedded in an output end cover of the stator sleeve and corresponds to the light output end of the biaxial crystal. A collimator fixing sleeve is embedded and corresponds to the light output side of the convergent lens or the lens set. A collimator or large-core-diameter optical fiber is fixedly arranged in the center of the collimator fixing sleeve in the axial direction. The rear end of the collimator or the rear end of the large-core-diameter optical fiber is connected with the demultiplexer in the demultiplexing system. The multichannel optical fiber rotary connector achieving conical refraction has the advantages of being simple in structure, resistant to electromagnetic interference, small in insertion loss, high in assembly accuracy, and stable and reliable in performance.

A superconducting article is provided that includes a substrate, an anti-epitaxial film over the substrate, a buffer film having biaxial crystal texture over the anti-epitaxial film, and a superconductor layer over the second buffer film. Also provided is a superconducting article as a tape, in a power cable, and a power transformer.

Disclosed is a metal laminated substrate for forming an epitaxial growth film for forming a semiconductor element having high biaxial crystal orientation on a surface of a metal substrate and a method of manufacturing the metal laminated substrate. The manufacturing method includes the steps of activating at least one surface of a metal plate T1 by sputter etching or the like; activating at least one surface of a metal foil T2 made of Cu or a Cu alloy which is cold-rolled at a rolling reduction of 90% or more; laminating the metal plate and the metal foil such that an activated surface of the metal plate and an activated surface of the metal foil face each other in an opposed manner and applying cold rolling to the metal plate and the metal foil which are laminated to each other at a rolling reduction of 10% or less, for example; and biaxially orienting crystals of the metal foil by heat treatment at a temperature of not lower than 150° C. and not higher than 1000° C.

The invention provides a polarizing prism based on an alpha-BaTeMo2O9 crystal. The polarizing prism comprises two alpha-BaTeMo2O9 crystal prism bodies and the top angle of each prism body is 28 degrees. The direction of incident light is along the axis c in crystal crystallography, the optical axis direction is perpendicular to the right-angle face of each prism body, and the two prism bodies are connected through an air layer along the inclining faces. According to output of crystal double-refraction polarized light in a biaxial crystal, the refractive index and the whole reflex angle which are actually used in polarized light of the alpha-BaTeMo2O9 crystal are calculated, the use ratio of the crystal is high, and polarized light output in a certain wave band is achieved. Through measurement, the extinction ratio of the polarizing prism is larger than 10000 and is close to that of a commonly used polarizing prism at present, and can satisfy the requirement for application in actual optics.

The invention discloses a Laguerre-Gaussian beam solid-state laser based on conical refraction annular light pumping, which comprises a pumping source, and is characterized in that a focusing lens, a biaxial crystal, a laser gain medium and a laser output mirror are successively arranged along the light output direction of the pumping source in a manner of sharing the same optical axis; and the biaxial crystal is located within twice focal length of the focusing lens. According to the invention, pumping light is converted into annular pumping light, and the conversion efficiency is close to 100%, so that the light-light efficiency of the pumping light to Laguerre-Gaussian laser light is enabled to be high. In addition, the conversion device has no special requirements for the temperature environment, and arrangement of a cooling device is not required. The Laguerre-Gaussian beam solid-state laser is high in adaptability, and has the characteristics of simple structure and easy implementation.

The invention discloses a laser machining head and a laser machining method thereof and belongs to the technical field of laser machining equipment and methods. The laser machining head comprises a laser device, a focusing lens and a biaxial crystal which are sequentially arranged as well as a zoom system, wherein the focusing lens and the focus of the focusing lens are located on two sides of the biaxial crystal respectively, the laser output by the laser device is parallel with the optical axis of the biaxial crystal, and the zoom system is arranged on one side of the biaxial crystal, and the focus of the focusing lens is located between the biaxial crystal and the zoom system. The laser machining head is high in machining efficiency and good in stability.

The invention discloses a high-order laguerre-gaussian beam solid laser, which comprises a pumping source, a focusing lens, a circular light conversion unit, a laser gain medium and a laser output coupling mirror, wherein the focusing lens, the circular light conversion unit, the laser gain medium and the laser output coupling mirror are arranged along a light output direction of the pumping source; the circular light conversion unit is formed by combining biaxial crystal and an imaging lens; and the biaxial crystal is put on a clamp of a rotary adjusting bracket. The high-order laguerre-gaussian beam solid laser has the advantages of being simple in device and high in output power, the quality of an output beam is good and an output transverse mode is adjustable.

The invention provides a biaxial-crystal electro-optical Q switch and a fabrication method thereof. The biaxial-crystal electro-optical Q switch is made of an integrated rectangular biaxial-crystal electro-optical crystal, a phase compensation wave plate is arranged at a central position of a light through direction of the electro-optical Q switch, electro-optical crystal components are arranged at parts of two sides of the phase compensation wave plate of the electro-optical Q switch, electrode plates are electroplated on two c surfaces, which extend along the light through direction and are parallel to each other, of each electro-optical component, the length of the phase compensation wave plate in the light through direction is odd times of the thickness of the phase compensation plate which is used for generating phase delay on a target laser, and the lengths of the two electro-optical crystal components are same. By the biaxial-crystal electro-optical Q switch, the temperature stability of the Q switch can be effectively and reliably improved, the Q switch is low in insertion loss and is simple to operate, the influence on the temperature stability of the Q switch caused by change of static birefringence of the biaxial-crystal electro-optical crystal with a temperature can be solved, and the inherent extinction ratio of the electro-optical Q switch is also ensured.

The invention relates to a compound lithium sodium fluoroaluminoborate, a lithium sodium fluoroaluminoborate birefringent crystal, a preparation method and an application of the lithium sodium fluoroaluminoborate birefringent crystal. The chemical formula of the compound is LixNa (1-x) AlB2O4F2 (x = 0.4-0.6), the molecular weight of the compound is 163.96-167.17, and the compound is synthesized by adopting a vacuum tube sealing method. The chemical formula of the birefringent crystal is LixNa (1-x) AlB2O4F2 (x = 0.4-0.6), the molecular weight is 163.96-167.17, the birefringent crystal belongs to a monoclinic system, the space group is P21/c, and the cell parameters are as follows: a = 3.6329 (3), b = 14.1750 (12), c = 8.3735 (10), V = 423.39 (7) 3 and Z = 4. The crystal is used for an infrared-deep ultraviolet band and is a biaxial crystal, and the transmission range is 200 nm to 3 microns; and the birefringence is 0.101 (1064nm). The crystal is prepared by adopting a vacuum tube sealing method, and the method has the advantages of simplicity in preparation, short growth cycle, low toxicity of used starting raw materials, stable physical and chemical properties and the like. The method can be used for manufacturing polarization beam splitting prisms, phase delay devices, electro-optical modulators and the like.

The invention relates to a light source capable of generating circularly polarized light through utilization of electricity. The light source comprises a substrate layer, wherein a first metal layer is set on the substrate layer; a quantum well layer is set on the first metal layer; a second metal layer is set on the quantum well layer; and an array composed of a plurality of chiral metal holes isset on the second metal layer. According to the light source capable of generating circularly polarized light through utilization of electricity, the circularly polarized light can be directly generated; through utilization of the chiral metal holes, a phase of the linearly polarized light is deviated and after the light is superposed, the circularly polarized light is formed; the circularly polarized light does not need to be generated through utilization of a biaxial crystal; and the generated circularly polarized light can be adjusted through adjustment of a voltage loaded to the quantum well layer. The light source is convenient. Time is reduced.

The invention relates to a fluorine lead metavanadate birefringent crystal as well as a preparation method and application thereof. The crystal has a chemical formula of Pb2VO2F5, belongs to a triclinic crystal system, and has a space group of rho-1; cell parameters of the crystal are shown as follows: a is equal to 5.6827(6) ANG, b is equal to 7.3729(8) ANG, c is equal to 8.3478(10) ANG, V is equal to 289.77(6) ANG<3>, and Z is equal to 2; the crystal is applicable to infrared-visible wavebands, and the transmission scope is 450-1300 nm; the birefringence ranges between 0.327 and 0.579, and the crystal is grown by adopting a hydrothermal method; and the crystal is regarded as a positive biaxial crystal because the following formula is met: the difference between nz and ny is greater than that between ny and nx. The crystal obtained according to the preparation method provided by the invention is easy to grow, polish, cut and store, chemically stable, and not easy to dissolve in water; meanwhile, the crystal has the advantages that the preparation period is short, the operation is simple, the cost is low, and the size is relatively large; and accordingly, the crystal can be applied to manufacturing of a Glan prism, a Wollaston prism, a Rochon prism or a beam splitting polarizer, and other polarization beam splitting prisms, and has important application value in the fields of optics and communication.

The invention relates to a compound tin boron oxybromide, a tin boron oxybromide birefringent crystal, a preparation method and application. The compound has a chemical formula of Sn2B5O9Br, the molecular weight of the compound is 515.37, and the compound is prepared by adopting a solid-phase synthesis method or a vacuum packaging method. The chemical formula of the crystal is Sn2B5O9Br, the molecular weight of the crystal is 515.37, the crystal belongs to an orthorhombic system, the space group is Pnn2, the cell parameters are as follows: a = 11.398 (4) angstroms, b = 11.446 (4) angstroms, c= 6.553 (2) angstroms, the unit cell volume is 854.9 (5) cubic angstroms, the transmission range is 330-3500nm, and the birefringence is 0.244 (3500nm) to 0.293 (330nm). A melt process, a high-temperature melt method, a vacuum packaging method, a hydrothermal method or a room-temperature solution method are adopted to grow the crystal. The tin boron oxybromide birefringent crystal has relatively large birefringence, has important application in the fields of optics and communication, can be used for manufacturing a polarization beam splitter prism, a phase delay device and an electro-optical modulation device, is used for an infrared-visible-ultraviolet band, and is a biaxial crystal.

An object is to provide an optical low pass filter that can achieve advantageous effects in spite of its simple structure, in reducing moire fringes and false color noise for a common subject that includes a two-dimensional pattern. An optical low pass filter according to the present invention includes a plane parallel plate composed of a biaxial crystal, wherein the plane parallel plate satisfies the condition 0°≦|θ|<20°, where θ is the angle formed by one of the optic axes of the biaxial crystal and the normal to the light incident surface.