8 results about "Uniaxial crystal" patented technology

The invention relates to the field of structured light field regulation and control and anisotropic medium light propagation, and discloses a method for regulating and controlling a spin Hall effect of a circular Airy beam by using uniaxial crystal and angular modulation. The method comprises the following steps: constructing a circular Airy beam with a self-focusing characteristic; angular phase modulation is applied to the system, so that the circular symmetry of the system is broken; the modulated light beam enters a uniaxial crystal to be propagated, and due to spin-orbit coupling in the crystal, a spin Hall effect is generated: a left-handed circular polarization component and a right-handed circular polarization component are gradually separated from each other and move along the positive axis and the negative axis respectively; after a light beam is emitted out of the uniaxial crystal, two focuses which are spatially separated and opposite in spinning direction are formed on a self-focusing focal plane. The device and the method can be used for structured light beam regulation and control, spin-orbit coupling and polarized light field modulation research.

The application discloses a stepless adjustable optical attenuator, which comprises a packaging sleeve, two uniaxial crystals, a holder, a motor and a control system; the two uniaxial crystals are arranged in parallel on the inner sides of two ends of the packaging sleeve, one of the uniaxial crystals is a beam splitter for separating incident light beams into o light and e light, and the other uniaxial crystal is a beam combiner for combining the incident o light and e light; one uniaxial crystal is rotationally matched with the packaging sleeve through the holder; an arc-shaped light hole is formed in the holder; the motor is used for driving the holder and the uniaxial crystal on the holder to rotate; the motor is electrically connected with the control system, and the control system is used for inputting and displaying information. The o light and e light are decomposed from the uniaxial crystal, then the o light and e light are combined again, the shift of the optical axis of the uniaxial crystal is changed by the motor, the continuous control of the light attenuation amount is realized, and the intelligent control is realized through the control system, so that the super-continuous attenuation with high precision is realized.

The invention discloses a method and a measuring system for solving birefringence phenomenon double-light tracks of a uniaxial crystal, and the method comprises the steps: defining a front surface normal vector, a rear surface normal vector and an optical axis direction vector of the crystal, and representing the spatial orientation of the crystal through the rotation operation around an x axis and a y axis; calculating a normal vector and an optical axis direction vector after rotation according to the rotation angle of the crystal around the z axis; based on the refraction law, the Snell law and the Fresnel equation, the propagation directions of the o light and the e light in the crystal are deduced; considering the refraction behavior of the rear surface of the crystal, and respectively calculating direction vectors after the o light and the e light are emitted; and determining the coordinates of the o light and the e light on the observation screen by utilizing a point equation and combining a ray tracing method, and rotating the crystal for one circle to generate a dual-light trajectory. According to the method, any crystal rotation operation is processed through a unified coordinate system, and the calculation complexity of a complex scene is reduced; the systematic intersection solution algorithm provided by the invention is combined with the e light wave vector / light separation calculation model, so that the light spot positioning efficiency is improved.

The invention discloses a heat effect compensation device and method for a disc uniaxial crystal laser, and belongs to the technical field of solid lasers, the heat effect compensation device comprises a gain medium structure, and the gain medium structure comprises a uniaxial laser crystal used for generating laser in a multi-pass optical path; the multi-pass system comprises a parabolic mirror, a large prism pair and a small prism pair, and the parabolic mirror, the large prism pair, the small prism pair and the gain medium structure have an optical path interaction relationship and are used for realizing repeated reciprocating of laser in the single-axis laser crystal; the array type phase plate is used for compensating light beam wavefront distortion of the gain medium structure caused by the heat effect; and the phase plate bracket is used for adjusting the position of the array type phase plate, so that the array type phase plate can perform corresponding position adjustment according to the change of the laser heat effect. The problem that in a high-power disc laser, the quality of light beams is deteriorated due to the heat effect of anisotropic laser crystals is solved.

This invention relates to a method for compensating for stress line birefringence in an optical voltage sensor. The optical voltage sensor includes a laser, a polarizer, an electro-optic crystal, a quarter-wave plate, a first prism, a uniaxial crystal, a second prism, and an analyzer, all arranged sequentially on the same optical path. The method includes the following steps: using the output signal of the optical voltage sensor, which is superimposed with the electro-optic phase delay and the additional phase delay caused by stress line birefringence, to form a synchronously rotating conical interference spot; detecting the peak voltage moment of the AC voltage to be measured, obtaining the rotation angle of the conical interference spot at the peak voltage moment, calculating the additional phase delay caused by stress line birefringence based on the rotation angle of the conical interference spot at this moment and the standard rotation angle of the electro-optic phase delay at the peak voltage moment; and compensating the output signal of the optical voltage sensor using the calculated additional phase delay caused by stress line birefringence.

The embodiment of the invention discloses an optical waveguide and a near-to-eye display module, and the optical waveguide comprises a waveguide substrate, the waveguide substrate is at least provided with a coupling-in region and a coupling-out region, and the substrate materials of the coupling-in region and the coupling-out region are made of a uniaxial crystal material; the optical axis of the crystal in the uniaxial crystal material is configured as follows: the angle of the optical axis of the uniaxial crystal material in the optical waveguide is related to the propagation angle and azimuth angle of each field of view light in different areas.

This invention discloses an optical path system for an optical switch, comprising: a first single-axis crystal, a second single-axis crystal, a polarization combining prism, a total internal reflection prism, a first fiber collimator, a second fiber collimator, a third fiber collimator, a motor, and a motor controller; both the first and second single-axis crystals are cylindrical and placed with their optical axes aligned; the polarization combining prism and the total internal reflection prism are applied to radially symmetrical positions on the exit circular surface of the second single-axis crystal, and the two prisms are placed perpendicularly, with the polarization combining prism on top and the total internal reflection prism on the bottom; the first fiber collimator is located at the input end on the incident circular surface of the first single-axis crystal, the second fiber collimator is located at the output end on the exit circular surface of the second single-axis crystal, and the third fiber collimator is located at the output end of the polarization combining prism; the motor controller is used to control the rotation of the motor, thereby controlling the rotation of the second single-axis crystal.

The invention provides a preparation method and application of a dihydroxyl difluoride triboric acid cesium dichloride nonlinear optical crystal, the chemical formula of the crystal is Cs3B3O3 (OH) 2F2Cl2, the crystal belongs to a hexagonal system, the space group is as follows: unit cell parameters are a = b = 16.0308 (3) + / -0.02, c = 4.2954 (1) + / -0.02, alpha = beta = 90 degrees, gamma = 120 degrees, and Z = 3, and the unit cell parameters are as follows: a = b = 16.0308 (3) + / -0.02, c = 4.2954 (1) + / -0.02, alpha = beta = 90 degrees, gamma = 120 degrees, and Z = 3. The crystal is grown by adopting a vacuum high-temperature melting method, a low-temperature solvent evaporation method or a hydrothermal method, and the ultraviolet transmission cut-off edge of the crystal is lower than 190 nm. The nonlinear optical effect of the crystal is about 1.5 times of that of KH2PO4 (KDP). The crystal has the advantages of simple preparation method, low toxicity of used initial raw materials, small harm to human bodies, stable physical and chemical properties, uniaxial crystal, easiness in application and the like. The method can be widely applied to nonlinear optical devices such as ultraviolet all-solid-state lasers and optical parametric oscillators.