18 results about "Birefringent crystal" patented technology

The present application discloses a single-frequency continuous-wave optical parametric oscillator, comprising a pumping source, a focusing lens, a resonant cavity, an optical parametric down-conversion crystal, and a birefringent crystal. The resonant cavity comprises a concave-convex lens, an output planoconcave lens, and at least two transitional planoconcave lenses; and a waist spot of pump light obtained through the focusing lens is located between the concave-convex lens and a first transitional planoconcave lens adjacent to the concave-convex lens on a light path. The center of the optical parametric down-conversion crystal coincides with a waist spot of the pump light; the birefringent crystal is located at the beam waist between the output planoconcave lens and the second transitional planoconcave lens adjacent to the output planoconcave lens on the light path; and the birefringent crystal adopts a critical phase matching or non-critical phase matching mode.

This invention relates to a nonlinear optical crystal of potassium triacetate dihydrate, its preparation method, and its uses. The molecular formula of the crystal is K3C6O8H. 10 It has a molecular weight of 331.62, belongs to the orthorhombic crystal system, and has a space group of [missing information]. P 212121, cell parameters are a =8.7596(5)Å, b =10.0487(6)Å, c =13.9979(6)Å, α =90.00° β =90.00° gamma =90.00° Z =4, V =1232.13(11)Å 3 Centimeter-sized crystals were grown using an evaporation method and an aqueous solution cooling method. Under 1064nm laser irradiation, the powder frequency doubling effect of this crystal was equivalent to that of KH₂PO₄. 4 (KDP). This crystal has an ultraviolet absorption edge shorter than 200 nm and an experimental birefringence of approximately 0.06 at 546 nm. It is simple to prepare, low in cost, exhibits significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

The application discloses a single-mode fiber to multi-mode fiber mode converter which comprises a single-mode fiber head assembly, a transmitting end C lens, a birefringent crystal sequence, a receiving end C lens and a multi-mode fiber head assembly arranged coaxially; an air gap is arranged between the light emitting end of the single-mode fiber head assembly and the transmitting end C lens, and an outer envelope tube of the transmitting end collimator is coaxially fixed to the outer circumferential side of the single-mode fiber head assembly and the transmitting end C lens; the single-mode fiber to multi-mode fiber mode converter can stably assemble each optical component and ensure the overall assembly precision by means of the outer envelope tubes of the transmitting end and receiving end collimators and the inner and outer envelope tubes of the crystal group; all the components are packaged by the overall outer envelope tube, the internal optical structure is effectively protected, and the firmness of the device structure is enhanced.

This invention relates to a novel birefringent crystal, its preparation and application, and belongs to the field of optical technology. The chemical formula of the birefringent crystal is Na₂ZnB₆O. 11 Na₂ZnB₆O₆ belongs to the monoclinic crystal system, space group C2 / c. This crystal can be prepared in an open system using high-temperature solid-state and high-temperature solution methods. It exhibits excellent birefringence, with a birefringence of 0.094 at 1064 nm and a transmittance of 53% at the ultraviolet cutoff edge of 190 nm. The Na₂ZnB₆O₆ prepared by the method described in this invention... 11 Birefringent crystals can be used to make polarization elements such as optical isolators, circulators, Glan prisms, and optical polarizers, and have important applications in the fields of optics and information communication.

The application provides a full solid-state mode-locked laser double optical comb generating device, and relates to the technical field of optical frequency, and comprises a lens group (1), a dichroic mirror (2), a gain crystal (3), a first birefringent crystal (4), a second birefringent crystal (5) and a semiconductor saturable absorber mirror (6), wherein the pump source generates pump light which passes through the lens group (1) to converge a light spot, and passes through the dichroic mirror (2) and is connected with the gain crystal (3), the front and back sides of the gain crystal (3) are connected with the first birefringent crystal (4) and the second birefringent crystal (5) through optical connection respectively, and the second birefringent crystal (5) is connected with the semiconductor saturable absorber mirror (6); the pump light is divided into two polarized lights which are orthogonal to each other by the birefringent crystal, and the gain medium is directly pumped, so that the full solid-state mode-locked laser double optical comb with compact structure, large range of repetition frequency difference tuning and high mutual coherence is realized.

This invention provides a device and method for measuring and demonstrating the optical rotation of a substance based on a birefringent crystal conic interferogram. The device includes a measurement optical path module, an image processing module, and a support and fixing assembly. Both the measurement optical path module and the image processing module are mounted on the support and fixing assembly. The measurement optical path module, arranged sequentially along the laser propagation direction, comprises a laser emitting unit, a polarizer unit, a linked sample tube, an optical path beam expander unit, and a birefringent crystal. A frosted glass screen is located at the output end of the measurement optical path module. The image processing module is correspondingly positioned to the frosted glass screen and is used to acquire and process the interference pattern. This invention improves measurement accuracy through optical path optimization and software algorithms, and extends and improves it into a demonstration experimental linkage device, solving problems such as large errors, zero-point drift, and inability to distinguish optical rotation directions in traditional measurement methods.

The application discloses a method for realizing pulse splitting and continuous adjustment of pulse interval through a three-wedge birefringent crystal structure and relates to the optical technical field. The method is used to solve the problems of the existing pulse splitting and delay technology, such as complex system, low control precision, poor flexibility, narrow application range and the like. The technical points of the application include that a laser pulse beam is incident on a first wedge-shaped crystal, the beam is split into two beams with perpendicular polarization directions, and the two beams generate an optical path difference; a second wedge-shaped crystal is adjusted to move in one dimension along the central axis direction of the crystal, thereby adjusting the time delay; after the two beams enter the second wedge-shaped crystal in sequence, the two beams become two parallel light paths; the optical axis direction of a third wedge-shaped crystal is perpendicular to the optical axis directions of the first wedge-shaped crystal and the second wedge-shaped crystal; after the two beams pass through the third wedge-shaped crystal, the optical path difference of the two beams and the first optical path difference are offset from each other, thereby realizing the collinear transmission of the two pulses.

This invention relates to an aminomethylphosphonic acid aminoguanidine nonlinear optical crystal, its preparation method, and its uses. The crystal has the molecular formula (CN4OH7)(CH2NH3PO3), a molecular weight of 203.15, belongs to the orthorhombic crystal system, and has a space group of [missing information]. P 212121, cell parameters are a =6.276(2)Å, b =10.239(4)Å, c =13.868(4)Å, α =90.00° β =90.00° c =90.00° Z =4, V =891.2(5)Å 3 Centimeter-sized crystals were grown using evaporation, aqueous solution cooling, or hydrothermal methods. The ultraviolet absorption edge of these crystals is shorter than 200 nm, and the experimental birefringence is approximately 0.15 at 546 nm. This crystal preparation method is simple and low-cost, exhibiting significant nonlinear optical effects, a large birefringence, a wide transmission range, and ease of growth and processing. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention relates to a nonlinear optical crystal of guanidinoacetic acid chloride, its preparation method, and its uses. The crystal has the molecular formula C3N3O2H8Cl, a molecular weight of 153.57, belongs to the tetragonal crystal system, and has a space group of [missing information]. I 2 d The unit cell parameters are a =15.7150(13)Å, b =15.7150(13)Å, c =11.0742(15)Å, α =90.00° β =90.00° gamma =90.00° Z =16, V =2734.9(6)Å 3 Centimeter-sized crystals were grown using evaporation, aqueous solution cooling, or hydrothermal methods. Under 1064 nm laser irradiation, the crystal exhibited a frequency doubling response similar to that of potassium dihydrogen phosphate. The ultraviolet absorption edge of the crystal was approximately 250 nm, and the experimental birefringence was approximately 0.08 at 546 nm. This crystal preparation method is simple and low-cost, possesses significant nonlinear optical effects, a large birefringence, a wide transmission range, and is easy to grow and process. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention relates to a compound, alkali metal antimony fluoride phosphate, and an alkali metal antimony fluoride phosphate ultraviolet birefringent crystal, as well as their preparation methods and uses. The compound has the chemical formula Na₄Sb₃F₇(PO₄)₂ and a molecular weight of 780.15 g / mol. The crystal has the chemical formula Na₄Sb₃F₇(PO₄)₂ and is monoclinic. P twenty one / m Space group, cell parameters are a =5.3557(2)Å, b =15.1697(6)Å, c =8.1164(3)Å, α = gamma =90°, β =97.6170(10)°, Z =2, V =653.59(4)Å 3 The crystal is grown using a hydrothermal method or a high-temperature melt method. The crystal obtained by this invention has a cutoff edge of 226 nm and a birefringence of 0.120@546 nm. It has advantages such as ease of growth, easy cutting, easy grinding, easy polishing, easy storage, stability in air, and resistance to deliquescence. It is widely used in linear optical devices such as Glan prisms, Wollaston prisms, Lochte prisms, or beam splitting polarizers.

This invention relates to a cesium hydroxyfluoroborate nonlinear optical crystal, its preparation method, and its uses. The crystal has the molecular formula CsB3O3F2(OH)2, belongs to the orthorhombic crystal system, and has the space group [missing information]. PCA 21, molecular weight 285.4, unit cell parameters are a =15.333(3)Å, b =6.176(4) Å, c =14.373(3)Å, α =90.00° β =90.00° c =90.00° Z =8, V =1361.1Å 3 The crystals are grown using room-temperature solvent evaporation or hydrothermal methods. This series of crystals has an ultraviolet transmission cutoff edge below 190 nm and an experimental birefringence of approximately 0.08 at 546 nm. The crystal preparation method is simple and low-cost, exhibiting significant nonlinear optical effects, a large birefringence, a wide transmission range, and ease of growth and processing. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention relates to imidazole trifluoroacetamidine nonlinear optical crystals, their preparation methods, and applications. The crystal has the molecular formula C(NH₂)₂CF₃(C₃N₂H₃), a molecular weight of 180.15, belongs to the orthorhombic crystal system, and has a space group of [missing information]. I 212121, cell parameters are a =8.781(1)Å, b =9.0684(9)Å, c =9.1540(8)Å, α =90.00° β =90.00° gamma =90.00° Z =4, V =728.93(13)Å 3 A millimeter-sized crystal was grown using an evaporation method and an aqueous solution cooling method. The crystal's ultraviolet absorption edge is shorter than 210 nm, and its experimental birefringence is approximately 0.12 at 546 nm. The preparation method is simple and low-cost, exhibiting significant nonlinear optical effects, a large birefringence, a wide transmission range, and ease of growth and processing. It can be used as an ultraviolet nonlinear optical crystal and a birefringent crystal.

This invention relates to a compound potassium fluoroiodate and a linear birefringent optical crystal of potassium fluoroiodate, as well as their preparation methods and uses. The chemical formula of the compound is KI4O. 10 F, with a molecular weight of 725.70, was prepared by hydrothermal or room temperature solution methods. This compound belongs to the triclinic crystal system, space group P1(_), with cell parameters a=7.1685(3) Å, b=7.4967(3) Å, and c=10.9225(4) Å. α =102.823(1)°, β =90.704(1)°, gamma =114.431(1)°, Z =2, V=517.50(4)Å 3 The crystal is grown using a hydrothermal method or a room-temperature solution method. It has a low ultraviolet cutoff edge and a large birefringence of 0.133@1064nm. Its excellent performance and good chemical stability make it suitable for fabricating polarizing prisms, phase delay devices, and electro-optic modulation devices for various applications, such as Glan prisms, polarization beam splitters, compensators, optical isolators, circulators, and optical modulators. It plays an important role in the fields of optics and communications.

This invention relates to a series of tetrafluorohydroxyborate nonlinear optical crystals, their preparation methods, and applications. The general molecular formula of these crystals is A₂B₃O₃F₄OH, where A = K and Rb, both belonging to the orthorhombic crystal system, and the space group is [insert space group here]. Ama 2; The K2B3O3F4OH has a molecular weight of 253.7 and a unit cell parameter of [missing information]. a =25.931(3)Å, b =22.586(4)Å, c =7.4353(11)Å, α =90.00° β =90.00° γ =90.00° Z =24, V =4354.7Å 3 The Rb₂B₃O₃F₄OH has a molecular weight of 341.07 and a unit cell parameter of [missing information]. a =27.0111(31)Å, b =22.9321(10)Å, c =7.6140(3)Å, α =90.00° β =90.00° γ =90.00° Z =24, V =4716.3Å 3 The crystals are grown using room-temperature solvent evaporation or hydrothermal methods. The ultraviolet transmission cutoff edge of this series of crystals is below 190 nm; the experimental birefringence is approximately 0.05@546 nm. The preparation method is simple and low-cost, exhibiting significant nonlinear optical effects and birefringence. They are easy to grow and process, and can be used as ultraviolet nonlinear optical crystals and birefringent crystals.

Certain embodiments of the present disclosure are directed towards an optical assembly such as a multiplexers / demultiplexers (MDM). One example optical assembly generally includes: a fiber array configured to provide an optical signal with a plurality of wavelengths; optical wavelength filters configured to separate the plurality of wavelengths into respective optical signals; a lens array configured to receive the respective optical signals from the optical wavelength filters and focus the respective optical signals before reaching an optical interface for a photonic chip; and a birefringent crystal disposed between the lens array and the optical interface.

This application provides a method and apparatus for precise measurement of the refractive index of a birefringent crystal, relating to the field of precise crystal refractive index measurement. The method includes: acquiring the interference pattern of the birefringent crystal to be measured; obtaining high-precision center coordinates based on the interference pattern and using a convolutional neural network; extracting the time-domain light intensity signal from the high-precision center coordinates and smoothing the time-domain light intensity signal using Savitzky-Golay adaptive filtering to obtain a smoothed signal; detecting the peaks and troughs of the smoothed signal based on multi-check logic to automatically count the order of interference fringe changes; changing the optical path difference by rotating the crystal, recording the corresponding fringe change order at different rotation angles α, and calculating the ordinary and extraordinary refractive indices. This application can achieve high-precision measurement using a common rotating platform, significantly reducing experimental costs and barriers to entry.

This invention relates to the field of laser processing technology, and more particularly to a laser slicing apparatus and method. The laser slicing apparatus includes a laser emitting unit, a time-domain control unit, a scanning and focusing unit, and a workpiece stage arranged sequentially along the optical path. The laser emitting unit outputs an initial single pulse; the pulse splitting component in the time-domain control unit converts the single pulse into a first pulse train with equal energy and intervals; subsequently, the interval adjustment component reassembles the first pulse train into a second pulse train adaptable to non-uniform interval distributions; the scanning and focusing unit precisely focuses the second pulse train to the target depth to scan and form a modified layer. This invention utilizes a dual-coordinated optical path design of a birefringent crystal and an adjustable reflector to solve problems such as uneven energy deposition and thermal defects caused by nonlinear effects during deep slicing, achieving high-quality, high-yield, and efficient cutting and peeling of hard and brittle crystals.

Embodiments herein describe a focal polarization displacer with a birefringent crystal disposed within the focal region of a lens. The birefringent crystal separates optical signals into at least two separate signals based on having different polarization states and an optical axis of the birefringent crystal is set so that focal points of the two separate signals are at an output surface of the polarization displacer where the two separate signals are output from the polarization displacer. This output surface can be a surface of the birefringent crystal or a surface of additional layer coupled to the crystal such as a polarization rotator or dielectric layer.