188 results about "Birefringent crystal" patented technology

The invention discloses a method for detecting residual stress of a birefringent crystal, which is characterized by comprising the following steps of: fixing a sample to be detected on a sample loading table; the imaging lens is used for acquiring light rays which sequentially penetrate through the polarizer module, a sample to be detected on the sample loading table, the analyzer module and the camera module in four states in three states that polarization axes of the polarizer module and the analyzer module are mutually orthogonal and a polarization angle is gradually increased by 30 degrees, and in a state that the polarizer module and the analyzer module are in parallel, and the imaging lens is used for acquiring the light rays which sequentially penetrate through the polarizer module, the sample to be detected on the sample loading table, the analyzer module and the camera module in the four states; collecting a light intensity matrix set through a camera module; acquiring a reference light intensity matrix through normalized linear superposition, and performing pixel-by-pixel operation with the reference light intensity matrix on the basis of the first light intensity matrix, the second light intensity matrix and the third light intensity matrix to acquire corresponding phase delay matrixes; eliminating natural birefringence and updating a phase delay matrix by deducting respective overall average phase delay amount pixel by pixel; through pixel-by-pixel weighted stacking, isogradient lines are eliminated, and distribution information of residual stress is obtained.

The invention relates to the technical field of optical communication, in particular to a multi-channel shifting circulator. Comprising an optical fiber unit, a birefringent crystal, a polarization unit, a transmission or reflection unit, a polarizer and a reflection element, the optical fiber unit comprises at least four optical fibers, an optical signal can enter and reach the birefringent crystal along any optical fiber, and the birefringent crystal is used for splitting the optical signal into O light and E light; the transmission or reflection unit comprises a plurality of PBS films, and the number of the PBS films is the same as that of the optical fibers; the polarization unit changes the polarization states of the O light and the E light, so that the O light and the E light pass through the corresponding PBS films; the light enters the polarizer and is reflected back to the polarizer through the reflecting element, and the polarization states of the O light and the E light are changed, so that the O light and the E light are reflected to the adjacent PBS films on the corresponding PBS films; and the polarization unit can change the polarization state of the reflected light, so that the reflected light is emitted along the corresponding optical fiber after being combined by the birefringent crystal. Therefore, the method is suitable for a transmission application scene requiring more than three ports to realize optical signals.

The embodiments of the present disclosure discloses an optical isolator core and an optical isolator. The optical isolator core comprises: a first birefringent crystal, a first Faraday rotator, a second birefringent crystal, a second Faraday rotator, and a third birefringent crystal that are successively arrange in the forward light path, all of which are parallel plate structures. The embodiments of the present disclosure achieves backward isolation for polarization-independent and non-collimating beam which simplifies the device structure and assembly process, thereby reduce size and cost.

The invention discloses a spectral imaging calculation system based on spectral response enhancement of a color detector, and belongs to the technical field of spectral imaging, the spectral imaging calculation system comprises a birefringence light splitting module and a color detector, the birefringence light splitting module comprises a polarizer, a birefringence crystal and a polarization analyzer, the polarizer, the birefringent crystal, the polarization analyzer and the color detector are sequentially and coaxially arranged along an optical axis; the color detector is also electrically connected with a signal processing module; incident light is converted into linearly polarized light through the polarizer, the linearly polarized light is decomposed into o light and e light through the birefringent crystal, and the o light and the e light are combined into emergent light through the polarization analyzer. The emergent light passes through a color detector to obtain a measurement signal; and the signal processing module receives the measurement signal and reconstructs a spectral image in combination with the spectral response matrix of the birefringence light splitting module and the spectral response function of the color detector. The spectral response characteristics of multiple color channels of the color image sensor are combined with the birefringence color development polarization principle, the rank of a spectral response matrix is expanded, and the spectral resolution and the imaging precision are improved, so that the spectral information of a substance is more accurately acquired and analyzed.

The utility model discloses a light engine which comprises a first part used for controlling image display, a second part used for adjusting imaging light, a third part used for improving imaging resolution and other parts, the first part is arranged on one side of the other parts, and the second part and the third part are arranged in the other parts. The third part is arranged between the first part and the second part, and / or the third part is arranged on the side, away from the first part, of the second part; wherein the first part is a display screen, the second part is an optical engine lens group, the third part comprises a birefringent crystal and a liquid crystal, and the other parts comprise an optical engine lens shell. According to the utility model, under the condition that the appearance specification and the optical structure of the optical engine are not changed, the resolution of the optical engine can be multiplied by controlling the refreshing of the birefringent crystal and the liquid crystal and matching with reasonable content output at an application end, so that the use effect and the use experience of the optical engine are greatly improved.

Embodiments herein describe using a birefringent element (e.g., a half-wave plate, full-wave plate, birefringent crystal, or metasurface) or a band-pass filter to reduce the laser line broadening induced by the soliton self-frequency shift. The birefringent element may a free space element that is part of the laser cavity. Due to dispersion, different frequencies (or colors) of light in the laser travel through the birefringent element at different speeds. This dispersion results in the birefringent element introducing slightly different polarization shifts for the different frequencies of light in the laser. When this light passes through a polarizer (which is set to filter out polarizations different from a desired polarization), the polarizer attenuates or extinguishes the frequencies that do not have the polarization of the design frequency of the birefringent element.

The invention discloses an optical circulator and a coaxial laser radar, and belongs to the technical field of optical processing. The optical circulator comprises a first birefringent crystal, a second birefringent crystal, a third birefringent crystal, a Faraday rotating mirror and a half-wave plate, and the first birefringent crystal and the third birefringent crystal are arranged in parallel. The first birefringent crystal is used for receiving an optical signal input by the first optical input port and reflecting the optical signal to the second optical receiving port; the third birefringent crystal is used for receiving an optical signal input by the second optical input port and reflecting the optical signal to the first optical receiving port; and the third port is used for outputting the emitted light signal transmitted by the second birefringent crystal, receiving the reflected light signal and returning the reflected light signal to the second birefringent crystal. According to the invention, the isolation degree of the optical circulator is improved, and the overall performance of the coaxial laser radar is improved.

The invention relates to a sulfur-antimony-lanthanum-barium compound, a sulfur-antimony-lanthanum-barium mid-far infrared birefringent optical crystal and a preparation method and application thereof, relates to a mid-far infrared birefringent crystal and a preparation method and application thereof, and aims to solve the problem of low birefringence of the existing mid-far infrared crystal, the sulfur-antimony-lanthanum-barium compound has the chemical formula of Ba2La2Sb4S10 (S2) and the molecular weight of 1424.22, is crystallized in a monoclinic system, and has the molecular weight of 294nm. The space group is P21 / c, and the cell parameters are as follows: a = 8.6373 (5), b = 14.7336 (9), c = 15.9161 (9), alpha = gamma = 90 degrees, and beta = 92.661 (2) degrees. Preparing a compound or a polycrystal material by using a high-temperature solution or a solid-phase method; a polycrystalline material is used for growing a single crystal, the birefringence of the single crystal is 0.53 at the position of 1064 nm, the single crystal has large birefringence within the range of 1-14 microns, and the single crystal is used in an optical isolator, a circulator, a beam shifter, an optical polarizer or an optical modulator.

The present invention relates to the technical field of artificial crystal materials, and more specifically to a birefringent crystal material, its preparation method, and its application. The present invention provides a new birefringent crystal material having the chemical formula [C(NH2)3][ICl4] and exhibiting a large birefringence. The preparation method for this birefringent crystal material utilizes raw materials with low human toxicity, a short crystal growth cycle, low cost, and high crystal purity. This birefringent crystal material can be used as a polarization optical device in the fields of optics and communications.

The utility model relates to the technical field of laser equipment, in particular to a laser assembly, a solid-state laser and laser processing equipment, and the laser assembly comprises a birefringent crystal which is used for emitting solid-state laser under the pumping effect, and the solid-state laser comprises two pieces of orthogonal polarized light with different wavelengths; the Q switch is arranged at one end of the birefringent crystal and is used for controlling the output of the solid-state laser; and the dual-wavelength output coupler is arranged at one end, deviating from the birefringent crystal, of the Q switch and is used for coupling and outputting two orthogonal polarized lights in the solid-state laser. Through the mode, the energy loss in the laser pumping cavity can be reduced, so that the laser threshold value is reduced, and the laser output power is improved.

A high extinction-ratio rotator includes a collimator that can collimate a signal light from an optical fiber, a pair of polarizing splitting prisms that include a first birefringence crystal wedge and a second birefringent crystal wedge, that can separate two orthogonal polarization components of the signal light into a vertically polarized light and a horizontally polarized light, a non-reciprocal 45-degree polarization rotator which the vertically polarized light and the horizontally polarized light exiting the pair of polarizing splitting prisms pass through, and a reflector. The vertically polarized light and the horizontally polarized light exiting the non-reciprocal 45-degree polarization rotator intersect on a surface of the reflector and are reflected back into the non-reciprocal 45-degree polarization rotator.

A pair of light rays spatially-sheared with a controllable beam-shear distance is generated by a module having a beamsplitter (BS) and two mirrors. The BS splits an input light ray into first and second split light rays respectively propagated on first and second light paths. The two mirrors are respectively located at distal ends of the two light paths, and cause each split light ray to undergo a two-stage reflection, thereby generating first and second reflected light rays directed to the BS. The BS processes the two reflected light rays to generate the pair of spatially-sheared light rays. Orientations of the two mirrors in yaw angle, pitch angle, or both, are jointly adjustable to realize and control the beam-shear distance without using any birefringent crystal-based prism. The module is used to form differential interference contrast (DIC) microscopes providing variable shear distances, advantages of orientation independence, etc.

The invention relates to the technical field of artificial crystal materials, in particular to a birefringent crystal material and a preparation method and application thereof. The invention provides a novel birefringent crystal material which has a chemical formula of [C (NH2) 3] [ICl4] and has huge birefringence. The raw materials used in the preparation method of the birefringent crystal material are low in toxicity to human bodies, the crystal growth period is short, the cost is low, and the crystal purity is high; the birefringent crystal material can be used as a polarization optical device in the fields of optics and communication.

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.

A device for measuring a carrier-envelope phase includes a first nonlinear optical crystal, a birefringent crystal, and a polarizing plate. The first nonlinear optical crystal produces a first Light that is a harmonic of an incident light and that has a polarization direction different from a polarization direction of the incident light. The birefringent crystal is downstream of the first nonlinear optical crystal in a light traveling direction, and a traveling speed of a light traveling along a slow axis is different from a traveling speed of the light traveling along the fast axis. The polarizing plate is downstream of the birefringent crystal in the light traveling direction, and a transmission axis of the polarizing plate is different from both the slow axis and the fast axis.

The invention discloses a lossless magneto-optical switch and a wave plate included angle adjusting method, and belongs to the field of optics, an input end is located on one side of a single-fiber collimator, and a first output end and a second output end are located on a third birefringent crystal I. By adopting a plurality of wave plate assemblies, a main sub-beam and a weak sub-beam can be accurately converged to the output ends; when the optical channels are switched, the intensities on the paths of the strong light and the weak light are essentially exchanged, the strong light and the weak light are coupled into different channels, and the sum of the energy at the first output end and the energy at the second output end and the sum of the energy at the first output end and the energy at the second output end after switching are always in a stable state. The change of the rotation angle of the Faraday optical rotation crystal is converted into the phase delay change of polarized light by the 1 / 4 wave plate, the phase delay change of the polarized light is reduced by the full wave plate, the angular dispersion of the Faraday optical rotation crystal is eliminated, and the problem of optical crosstalk generated in an optical transmission system is effectively solved.

A measurement device includes a light source configured to emit a fundamental wave that is a femtosecond pulsed laser beam, a second harmonic generator configured to convert a portion of the fundamental wave into a first-second harmonic, a birefringent crystal configured to split an angle for the first-second harmonic, a wavelength selection element configured to block the fundamental wave and transmit therethrough the first-second harmonic and a second-second harmonic, a polarizer configured to polarize the first-second harmonic and the second-second harmonic to approximately same polarizations, and an image detector.

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 present invention discloses a three-port reflective optical circulator based on a birefringent crystal, belonging to the field of optical communications. The three-port reflective optical circulator comprises a first birefringent crystal, a half-wave plate assembly, a roof prism, a Faraday rotator crystal, a second birefringent crystal, a quarter-wave plate, and a reflector, which are arranged in sequence. The first port, the second port, and the third port are respectively located on a side of the first birefringent crystal away from the half-wave plate assembly. The birefringent crystal performs light splitting to split a light beam into two sub-beams, o-polarized light and e-polarized light, with mutually perpendicular polarization directions. The polarization directions of the sub-beams are controlled by the half-wave plate, the quarter-wave plate, and the Faraday rotator crystal. Finally, the birefringent crystal performs light combining, thus realizing the functions of the optical circulator with input at the first port and output at the second port, and with input at the second port and output at the third port. The three ports are located on the same side of the optical circulator, making it easier to arrange other components and miniaturizing the optical circulator.

The present invention provides a two-dimensional array multi-channel, multi-port optical circulator, comprising two or more collimator arrays, each collimator array comprising three or more collimators, with the collimators in the same collimator array being located on the same side of the optical circulator; a first birefringent crystal disposed on one side of the collimator array, through which optical signals from the multiple collimator arrays all pass; a half-wave plate assembly disposed on a side of the first birefringent crystal away from the collimator array, the half-wave plate assembly comprising two or more half-wave plates; an optical rotator disposed on a side of the half-wave plate assembly away from the first birefringent crystal, a light combining and splitting device disposed on the side of the optical rotator assembly away from the half-wave plate assembly; a polarization state converter disposed on a side of the optical rotator assembly away from the light combining and splitting devices; and a reflector disposed on a side of the polarization state converter away from the optical rotator assembly. The present invention can integrate a multi-channel, multi-port optical circulator, facilitating miniaturization of the optical circulator.

The present invention provides a thermal compensation birefringent filter and an imaging device. The thermal compensation birefringent filter adopts a four-stage series interference polarization unit design, with the third and fourth stage interference polarization units placed in the middle, and the first and second stage interference polarization units placed on both sides. Each interference polarization unit is based on the principle of interference polarization and is based on two birefringent crystals with different refractive index temperature coefficients. The phase difference change caused by temperature change is compensated by the reasonable placement of the optical axis. The birefringence of crystals of different materials is different, and the thermo-optical coefficient is also different. The problem of spectral line drift caused by temperature change is solved, so that the working wavelength is always stable at 656.3nm (i.e., the Hα line of the sun), and the fluctuation range of the central wavelength of the spectral line does not exceed 0.002nm. The thermal compensation birefringent filter designed by the present invention has no electrical control, temperature control and mechanical devices in the system, which can reduce the physical size of the instrument and improve the stability of the instrument.

The invention relates to a guanidino hydantoin methanesulfonate nonlinear optical crystal as well as a preparation method and application thereof. The molecular formula of the crystal is C3N3OH < 6 > (CH3SO3), the molecular weight is 195.2, the crystal belongs to an orthorhombic system, the space group is P212121, and the cell parameters are as follows: a = 5.5142 (5), b = 8.6892 (7), c = 17.4413 (16), alpha = 90.00 degrees, beta = 90.00 degrees, gamma = 90.00 degrees, Z = 4 and V = 820.5 (3) 3. Under the irradiation of 1064nm laser, the powder frequency-doubled effect of the crystal is about 3-5 times that of KH2PO4 (KDP), the ultraviolet absorption edge of the crystal is about 217nm, and the experimental birefringence is about 0.08-546nm. And growing crystals with the size of more than centimeter by adopting an evaporation method, an aqueous solution cooling method or a solvothermal method. The crystal is simple in preparation method and low in cost, has a relatively large nonlinear optical effect, a relatively large birefringence and a wide transmission range, is easy to grow and process, and can be used as an ultraviolet nonlinear optical crystal and a birefringence crystal.

Method for laser material processing using a processing laser beam (3), wherein a first laser beam (8a), which is coupled into at least a first fiber core (9a) of an optical multicore fiber (9), and a second laser beam (8b), which is coupled into at least a second fiber core (9b) of the multicore fiber (9), are generated from a polarized input laser beam (5) using a birefringent crystal (7), wherein by influencing the polarization of the input laser beam (5) the ratio in which the power of the input laser beam (5) is divided between the first and the second laser beam (8a, 8b) is changed with a modulation frequency (f) between 1 Hz and 100 kHz, in particular between 100 Hz and 100 kHz, and thereby the first and the second laser beam (8a, 8b) can be coupled out of the multi-core fiber (9) alone or together as a processing laser beam (3). characterized by that the polarization is influenced by switching between linearly, circularly or elliptically polarized polarization by means of an electro-optic polarization modulator (6), in particular a Pockels cell or Faraday rotator, which can be controlled with the modulation frequency (f) to change the polarization of the input laser beam (5).

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.

The invention belongs to the technical field of optical detection, and particularly relates to the field of optical wavefront detection, in particular to a lateral shear interference wavefront detection system and method based on an orthogonal polarization birefringent crystal. The system comprises a laser light source, wherein a polarizer and a beam splitter prism are sequentially arranged on an emergent light path of the laser light source; the invention discloses a polarization birefringent crystal, a reflector and a polarization camera. The method comprises the following steps: processing four phase shift interferograms, and extracting a wavefront gradient by using an arc tangent function; solving the system of linear equations to determine wavefront phase distribution by adopting an integral algorithm based on a least square method; and based on the extracted wavefront gradient, performing quantitative phase imaging by using a phase recovery algorithm. The device is simple in structure, high in stability and high in light energy utilization rate; the method is good in real-time performance, high in precision, capable of effectively restraining noise influences, capable of improving the precision of wavefront measurement, capable of meeting the requirement for high-precision optical system detection and wide in application range.

An integrated electro-optical non-reciprocal mode converter based on birefringent crystal refractive index matching comprises a chip, the upper layer of the chip is an electro-optical material film with birefringent characteristics, a mode converter is prepared on the electro-optical material film, and the mode converter is a two-port device; the first port is used for receiving an input optical signal of a mode 1 and allowing the optical signal to enter the mode converter; and the second port is used for outputting the converted optical signal in the mode 2. The refractive index difference of a birefringent material to a transverse electric mode (TE) and a transverse magnetic mode (TM) is utilized to realize the pre-coarse matching of the refractive indexes of TE and TM modes, and then the fine matching of the refractive indexes and wave vectors is realized in combination with electro-optical modulation, so that the integrated electro-optical mode converter insensitive to the process is realized. The device is simple in structure and has a wide application prospect.

The invention belongs to the technical field of birefringent crystal material preparation, and particularly relates to a birefringent crystal and a preparation method and application thereof. The chemical formula of the crystal is Ba (SnF3) 2 (H2O), the crystal belongs to an orthorhombic crystal system, and the space group is Pnnm; the cell parameters are as follows: a = 9.9-10.0, b = 17.4-17.5, c = 4.3-4.4, and alpha = beta = gamma = 90 degrees; the birefringence of the Ba (SnF3) 2 (H2O) birefringence crystal reaches up to 0.33 (at546 nm), and the Ba (SnF3) 2 (H2O) birefringence crystal reflects remarkable optical anisotropy and is suitable for high-performance optical devices; secondly, the crystal has a broad band gap of 3.77 eV and an ultraviolet cut-off edge of 328 nm, so that the crystal can efficiently transmit ultraviolet light and is suitable for optical application of an ultraviolet band; besides, the spectrum transmission range of the crystal covers 2.5-13.3 microns, and the crystal shows excellent transmission performance from ultraviolet band to middle infrared band, meets the requirements of broadband optical devices, and has wide application potential in the optical field.

The present invention discloses a high extinction ratio optical rotator, which sequentially includes a collimator, a polarization beam splitting prism pair, a non-reciprocal 45-degree polarization rotator, and a mirror along the optical path direction; the polarization beam splitting prism pair is composed of a first birefringent crystal wedge plate and a second birefringent crystal wedge plate with mutually perpendicular optical axis directions. The optical axis of the first birefringent crystal wedge plate is parallel to the vertical plane, and the optical axis of the second birefringent crystal wedge plate is perpendicular to the vertical plane; the polarization beam splitting prism pair separates two orthogonal polarization components of the input signal light. After passing through the polarization beam splitting prism pair, the signal light is divided into vertically polarized light and horizontally polarized light with orthogonal polarization states, and the intersection point of the vertically polarized light and the horizontally polarized light is located on the surface of the mirror. By setting the polarization beam splitting prism pair, the present invention eliminates the deviation of the polarization rotation angle of the polarization rotator caused by factors such as temperature, wavelength, and processing tolerance, ensuring that the signal light passing through the optical rotator can obtain a high extinction ratio.

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 present invention provides a Ba3Sc2(BO3)4 ultraviolet birefringent crystal, preparation and application. The Ba3Sc2(BO3)4 ultraviolet birefringent crystal has a centrosymmetric structure, belongs to the trigonal crystal system, has a space group of P-3m1, and has unit cell parameters of #imgabs0##imgabs1#α=90°, β=90°, γ=120°, Z=1, #imgabs2#. The room temperature transmission spectrum shows that the ultraviolet birefringent crystal has a wide transmission range (0.2~3.5μm), a transmittance of more than 70%, a short ultraviolet cutoff edge (198nm) and a large birefringence (Δn=0.145), and has the advantages of stable physicochemical properties, good mechanical properties, not easy to deliquesce, easy to cut, polished and stored, and is expected to be widely used in the field of ultraviolet birefringent optical materials. In the present invention, a flux method is adopted to prepare the ultraviolet birefringent crystal, which is simple to operate, the raw materials are readily available, and the preparation conditions are easy to achieve.