134 results about "Prism pair" patented technology

A rotary refractive laser scanner head uses two sets of lenses and prisms aligned along a common optical axis. Each prism is paired with one of the lenses. The lens-prism pairs are separately mounted rotatable on a common axis coaxial with the optical axis. A motor drives two gear sets. Each gear set is separately coupled to one of the two lens-prism pairs and rotates them at selected, typically different speeds. An input laser beam is directed along the optical axis at one of the lens-prism pairs. The first pair collimates and refracts the input beam into an intermediate deflected beam according to Snell's law and the characteristics of the laser beam and optics. The second pair receives the intermediate beam and further deflects it to form an output beam. By selecting the motor speed, gear ratios, optics spacing, characteristics and prism wedge (deflection) angle, the scanner head effectively can scan an output laser beam over a desired pattern area.

To effectively reduce a measurement error in a parameter indicating two-dimensional spatial distribution of a state of polarization generated by variations in retardation of a birefringent prism pair due to a temperature change or other factors, while holding a variety of properties of an imaging polarimetry using the birefringent prism pair. By noting that reference phase functions φ₁(x, y) and φ₂(x, y) are obtained by solving an equation from each vibration component contained in an intensity distribution I(x, y), the reference phase functions φ₁(x, y) and φ₂(x, y) are calibrated concurrently with measurement of two-dimensional spatial distribution S₀(x, y), S₁(x, y), S₂(x, y), and S₃(x, y) of Stokes parameters.

An optical switch using Risley prisms and rotary microactuators to independently rotate the wedge prisms of each Risley prism pair is disclosed. The optical switch comprises an array of input Risley prism pairs that selectively redirect light beams from a plurality of input ports to an array of output Risley prism pairs that similarly direct the light beams to a plurality of output ports. Each wedge prism of each Risley prism pair can be independently rotated by a variable-reluctance stepping rotary microactuator that is fabricated by a multi-layer LIGA process. Each wedge prism can be formed integral to the annular rotor of the rotary microactuator by a DXRL process.

A road surface detection system for a vehicle includes an optical emitter disposed at the vehicle and configured to emit a beam of light downward and forward of the vehicle. A receiver is disposed at the vehicle so as to receive light emitted by the optical emitter that is scattered or reflected from the road surface. The receiver includes a prism and an imager, and the prism refracts the light so that the imager captures received light that is refracted by the prism. A control includes a processor operable to process image data captured by the imager. The control, responsive to processing of image data captured by the imager, determines spectral characteristics of materials present on the road surface. The control may determine the type of material present on the road surface by determining the parts of the spectrum absorbed by the material.

A programmable, ultrafast optical delay line based on reversible frequency conversion uses a time-prism pair and no moving parts. A first electro-optic phase modulator acting as a first time-prism shifts the frequency of an incoming pulse train. The pulse train passes through a dispersion element, such as a dispersive fiber, which delays the pulse train by an amount that is directly proportional to the magnitude of the frequency shift, which in turn is proportional to the magnitude of the phase modulator drive voltage. A second electro-optic phase modulator is driven π out of phase to the first modulator and restores the frequency of the delayed pulse train to the original frequency of the incoming pulse train. To reduce pulse broadening effects and enhance performance further, soliton propagation inducing elements can be employed between the time-prisms.

The invention provides a multi-channel dynamic optical dispersion compensator which comprises a double-fiber collimator, a roof prism, a polarized switching assembly, a prism pair, a Fourier lens, a transmission type phase grating, a reflecting mirror and a silicon-based liquid crystal chip, wherein the transmission type phase grating and the silicon-based liquid crystal chip are respectively positioned on a front focal plane and a rear focal plane of the Fourier lens to form a 2f system; and two tail fibers of the double-fiber collimator are respectively used as an input end and an output end of the multi-channel dynamic optical dispersion compensator. According to the multi-channel dynamic optical dispersion compensator disclosed by the invention, an optical circulator adopted in the prior technical scheme can be omitted; and the multi-channel dynamic optical dispersion compensator has the characteristics of low loss, small size and low cost.

The invention relates to an intermediate infrared femtosecond mode-locked laser which comprises a collimating mirror, a focusing mirror, an input spherical surface mirror, a laser medium and a spherical surface high-reflection mirror which are sequentially arranged along a direction of a pumping light beam outputted by a laser diode, wherein lasers in a five-mirror laser resonance cavity formed by the input spherical surface mirror, the spherical surface high-reflection mirror, the spherical surface high-reflection focusing mirror, an output coupling mirror and a graphene mode-locking element is reflected onto the high-reflection focusing mirror through the input spherical surface mirror, is focused on the graphene mode-locking element, returns back along the original path by sequentially passing through the spherical surface high-reflection focusing mirror, the input spherical surface mirror, a laser crystal and the spherical surface high-reflection mirror, is deflected and reflected to a dispersion compensation prism pair by the spherical surface high-reflection mirror, and is output from the output coupling mirror through a slit. According to the intermediate infrared femtosecond mode-locked laser, graphene growing by adopting a CVD (Chemical Vapor Deposition) method is transferred to a laser wavelength high-reflection mirror, and is protected by using inert gas, and thus stable mode-locked laser pulse output is realized in an intermediate infrared band. The intermediate infrared femtosecond mode-locked laser has the advantages of being simple in regulation, low in manufacture cost, and easy to realize single layer (little non-saturated loss).

The invention provides differential solution concentration measuring device and method. Laser is used as a light source, and a semi-reflective and semi-transparent lens and a reflector are utilized to divide an incidence beam into two parallel beams which respectively enter the same sides of a prism pair in opposite positions in a prism set by liquid, are emitted from the other side of the prism set and finally received by a linear array CCD through the liquid. When the concentration changes, the refraction angle of the incidence light changes in the prism and causes the deflection angle of the emergent beam changes accordingly so that the image spot of a beam emitted from the other end of the prism changes the position on the CCD. After the corresponding relation between the positions relation of the two image spots on the CCD and the solution concentration is established, the concentration of the liquid is measured. The invention has the shared advantage of differential measurement technology as well as stable and reliable measuring result and easy distribution, can measure the change of the solution concentration in real time and can work in adheres industrial environment, such as causticity, and the like.

The invention relates to a totally solidified femtosecond laser with a double cavities series structure, which is made up of four semiconductor laser pumping sources, four plating sphere mirrors, two blocks of laser crystals used as gain media, two prism pairs, a fully reflector (or semiconductor saturated absorbing mirror) and a output coupling mirror. The centre wavelength outputted by the laser is 830nm, the tuning range is 100nm, and the outputted pulse width is about 100fs. The centre wavelength outputted by semiconductor pumping light source is 673nm. The laser is compact, the cost is low and the performance is stable.

The invention relates to a high-resolution high-speed polarization difference imaging method. In the method, linearly polarized light which can be controlled and of which the polarization directions are orthogonally changed at a high speed is generated by using characteristics of a high-speed time division deviated light path of an acousto-optic deflector and a characteristic that a lateral displacement polarization prism spectrometer integrates orthogonal line polarized light, system resolutions in the two directions are improved, and the high-speed polarization difference imaging method is formed. By the method, the defect that only the system resolution in one direction can be improved in the prior art is overcome; the scanning efficiency of a system is improved; system errors are reduced; resolving accuracy is improved; and the system has higher stability and high high-resolution imaging speed.

The invention discloses a device and method for measuring a refractive index of an intermediate infrared multi-wavelength material. The device comprises a laser diode, a beam shaping device, an input mirror, a laser crystal, a spherical surface high reflection mirror, a prism pair, a slit, an output coupling mirror, a Faraday isolator, a half-transparent and half-reflecting mirror, an adjustable diaphragm, a precise rotating platform, a spectrograph and a dual-channel power meter. The invention realizes direct measurement of refractive indexes of a material to be measured in a wide-spectrum range under different intermediate infrared wavelengths, solves the problem of difficulty in measurement of the refractive index of the material with intermediate infrared wavelength, and is simple andeasy in a measurement process, thus the measurement process of the refractive index is greatly simplified and the measurement cost is reduced.

The invention discloses a liquid crystal optical phase shift detection system and method based on an interference method. The system is structurally characterized in that light emitted by a laser light source passes through a half-wave plate and then is divided into two beams of linearly polarized light by a first polarization splitting prism, wherein the polarization directions of the two beams of linearly polarized light are perpendicular to each other; one beam of linearly polarized light irradiates a liquid crystal optical phased array sample, is reflected by a first reflector and then enters a second polarization splitting prism; the other beam of linearly polarized light is reflected by the second reflector and then enters the second polarization splitting prism; and the second polarization splitting prism combines the two incident light beams, the combined light beam sequentially passes through a quarter-wave plate and a polarization analyzer and then irradiates the target surface of a charge coupling element, and the charge coupling element is connected with a computer control center. According to the invention, the absolute phase retardation of the sample is determined, high-precision, high-resolution, rapid and automatic detection of the two-dimensional liquid crystal phase shifter is realized, and the resolution and precision of phased array phase distribution detection are improved.

The invention relates to the short pulse laser field; a rectangular prism combination is employed in a chamber; a multi-reflection method between rectangular prism pairs can enlarge a physics chamber length of a laser chamber; a full reflection surface of the rectangular prism is plated with a chirp mirror reflection film so as to generate chamber inner element dispersion compensation effect; in addition, a semiconductor saturable absorber serves as a front chamber mirror or a rear chamber mirror of a standing-wave chamber, thus realizing the full solid miniature mode locked laser, and realizing burst pulse or ultrashort pulse output with a high peak power a narrow pulse width; in addition, each optical element in the laser chamber can form an integrated body through optical cement or deepening optical cement.

The invention discloses an astigmatism eliminating light beam shaping system based on a prism pair and a cylindrical mirror. The system comprises a collimating lens, the prism pair, a light beam displacement block and the cylindrical mirror, wherein the collimating lens, the prism pair, the light beam displacement block and the cylindrical mirror are sequentially arranged on the same light path. According to the astigmatism eliminating light beam shaping system based on the prism pair and the cylindrical mirror, light beams are shaped, the dimensional proportion of light spots obtained in the fast axis direction and the slow axis direction and converged through a converging lens is larger than 1:5, and meanwhile the astigmatism of the light beams and the astigmatism generated by the prism pair are eliminated. The system has the advantages of being high in light beam quality after the light beams are shaped, capable of improving the signal to noise ratio of an instrument, easy to adjust in the installation and manufacture processes and the like.

The invention provides a broadbandTi:sapphire tunable Raman laser. According to the broadband Ti:sapphire tunable Raman laser, a green laser is composed of a laser total-reflection mirror, an acousto-optic Q switch, a semiconductor laser module, a harmonic wave sheet, a frequency doubling crystal and a green laser output mirror. An LDA pump laser gain material is used for generating 1064mm laser. A 532mm laser is generated through the frequency doubling crystal. Pumping is conducted by the 532mm laser on a Ti:sapphire crystal, so that 1000nm-1100nm wave length is generated. A Raman reflecting mirror and a Raman output mirror constitute a resonance cavity. The laser generates simulated Raman scattering under the feedback action of the resonance cavity after passing through a Raman crystal. Through selection of a prism pair and a reflecting mirror, the wave length continuous tunable function is achieved. After the laser passes through the Raman crystal, due to the Raman effect, the frequency shift function is achieved. Finally, long wave length beyond the spectral line of emission of the Ti:sapphire laser is output. The broadband Ti:sapphire tunable Raman laser expands the output wave length range of the Ti:sapphire laser.