46 results about "Porro prism" patented technology

A laser resonator for generating a laser beam having beam quality along two transverse axes that is determined primarily by the mode discrimination characteristics of one axis. The apparatus including a means for providing a collimated beam of electromagnetic energy with a predetermined orientation with respect to a line of sight thereof, and, a means for rotating the beam such that a transverse mode selection therefor is the same for two orthogonal directions thereof. The first means includes a slab laser having principal axes, and the second means includes a porro prism or a Benson prism. The prism is rotated 45 degrees about the line of sight with respect to the slab axes. The beam is rotated through successive round trip passes through the slab. A telescope, or an anamorphic telescope may be disposed between the slab and the prism. The resonator has a high aspect ratio slab lasing medium with a first and a second end that emit a laser beam. An aperture stop with a narrow transverse dimension and an orthogonal wide transverse dimension defines the laser beam profile. The slab itself may define the aperture stop. A first reflector, is aligned to reflect the laser beam emitted from one end of the slab back into the slab, and thereby define a first end of a resonant cavity. An anamorphic telescope is aligned to receive and reshape the laser beam profile to be substantially symmetrical about its transverse axes. The beam profile of the reshaped laser beam is rotated 90° and reflected, by a second reflector, back into the telescope, defining the second end of the resonator. The reflectors may be porro prisms, mirrors, or Benson prisms. Polarization out-couplers are used in conjunction with electro-optic Q-switches to out-couple-laser energy. The slab may be solid state Yb:YAG.

The invention discloses a method and a device for multiplexing and encoding orbital angular momentum states of light beams, which belong to the technical field of photoelectricity. The device consists of a laser, a polarizer, a beam expander, a spatial light modulator, three 1 / 4 wave plates, a Fourier transform lens, a polarization splitting prism, two Porro prisms and an aperture. The method comprises the following steps of: firstly, generating a plurality of light beams which are uniformly distributed on a circumference taking an incident light axis as a center and are in different orbital angular momentum states by an optical system which takes the spatial light modulator and the Fourier transform lens as core elements; secondly, decomposing the light beams into two polarized light beam components which can rotate freely and have mutually vertical polarization directions by the optical system which consists of the polarization splitting prism, the 1 / 4 wave plates and the rotary Porro prisms; and finally, superposing the two polarized light beam components to obtain the required superposition of the orbital angular momentum states so as to realize the multiplexing and the encoding of the orbital angular momentum states of the light beams.

A thermal birefringence compensator for a double pass laser system, which includes a polarization or conventionally outcoupled laser resonator, a gain medium and a compensator optically coupled to the gain medium. In one implementation, the compensator, which acts as an end reflector, includes a Benson prism, a first quarter waveplate with its principle axes aligned to the fold axis of the Benson prism, and a second quarter waveplate with its principle axes at 45° to the fold axis of the Benson prism. Alternatively, the compensation's prism can be a Porro prism.

The invention relates to a method for realizing beam orbital angular momentum spectrometry, which belongs to the technical field of laser application. The invention consists of a light source to be tested, two polarization dispersion prisms, 1 / 2 wave plate, two parallel optical flats, two pieces of 1 / 4 wave plates, a total reflector, a rectangular prism, a Porro prism, a Pi / 2 phase delay piece and a power detector. The invention adopts the two parallel optical flats and the rectangular prism to realize the beam splitting and the beam combining of the beams, ensure the good parallelism of beam splitting light and the coaxiality of beam combining light, and realize the complete identical optical paths and attenuation of the two bunches of light. The invention adopts the polarization dispersion prism, the total reflector, the Porro prism and the two 1 / 4 wave plates to realize the beam splitting, and the two bunches of light obtained by the beam splitting rotate coaxially to further realize the coaxial superimposition of the beam and a rotating mirror image thereof. The orbital angular momentum spectrum of an incident beam can be analyzed by measuring the relation between the power of the beam combining light and the rotation of the Porro prism. The method of the invention has application value in the laser intelligence processing field.

An interferometer provides a large dynamic range for perpendicular displacement measurements. In operation, a measurement reflector on an object reflects a measurement beam to an overlying Porro prism, and a reference reflector on the object returns a reference beam to the interferometer. A second Porro prism in the interferometer can return the reference beam for a second pass to the reference reflector, while the measurement beam complete only one pass. Reductions in beam walk-off result from retroreflections in the Porro prisms and the matching effects that some object rotations have on measurement and reference beams. Perpendicular motion of the object relative to the first Porro prism causes a Doppler shift only in the measurement beam. Accordingly, a beat frequency found when combining the measurement and reference beams can indicate a residual Doppler shift associated with the motion in the perpendicular direction.

The invention relates to a vertical transmission indoor optical reference calibration system, which comprises an auto-collimation theodolite, a first planar mirror system, a second planar mirror system, a first Porro prism, a second Porro prism and a reference column, wherein the first Porro prism and the second Porro prism are sequentially arranged on the reference column from top to bottom; the auto-collimation theodolite, the second planar mirror system and the second Porro prism are arranged on the same optical path; a first planar reflecting system and a second planar reflecting system are sequentially arranged from top to bottom; a first planar mirror is arranged on a reflected optical path which passes through a second planar reflection system; and the first planar mirror and the first Porro prism are on the same optical path. The invention provides a high-precision, high-stability and long-distance accurate positioning vertical transmission indoor optical reference calibration system.

The invention discloses a compact and stable high-peak-power optical fiber output laser. The laser comprises a resonant cavity, pumping sources, a half-wave plate, a polarization beam splitter, a photoelectric detector, a coupling lens, an optical fiber and a collimating lens group, wherein the resonant cavity comprises a Porro prism, a passive Q-modulation crystal, a laser crystal and an output mirror; in the compact and stable high-peak-power optical fiber output laser, the Porro prism, the passive Q-modulation crystal, the laser crystal, the output mirror, the half-wave plate, the polarization beam splitter and the photoelectric detector are arranged in sequence in a light path direction of laser; the pumping sources are uniformly arranged in the center of the laser crystal by using stack arrays; the polarization beam splitter splits the laser into a branch light path perpendicular to the light path; the laser on the branch light path enters the optical fiber through the coupling lens; and the collimating lens group is arranged at the end of the branch light path. According to the compact and stable high-peak-power optical fiber output laser, the stability of a system is ensured, the risk of optical fiber damage is lowered, and the peak power of the optical fiber output laser is indirectly increased.

The invention relates to a Porro prism azimuth reference measuring instrument. A right-angle prism is mounted on a prism bracket; the prism bracket and a base are coaxially mounted; a level bubble is mounted at the upper part of the prism bracket; the base at one side of the prism bracket is provided with an upper support plate and a lower support plate respectively; a screw is vertically fixed between the two support plates; a leveling nut is meshed on the screw; a mounting block is sleeved on the screw above the leveling nut; and a cylindrical right-hand spring is sleeved on the screw between the mounting block and the upper support plate. The invention belongs to a new azimuth measuring reference device; the Porro prism is mounted on a chassis of navigation equipment and can fully replace the plane mirror on an internal inertial platform of the navigation equipment, wherein the plane mirror is used as azimuth reference of the system and also can check the azimuth output of the system; and meanwhile, the problem that a theodolite must be positioned on the normal of mirror surface and at equal altitude during the leading-in and leading-out of azimuth reference is solved, the field use is facilitated, the operation is convenient, and the precision is high.

A Porro prism and a light polarizer are combined in a single optical element termed a Hendrix Prism. The design provides retro-reflection of incoming light of a predetermined polarization in a direction anti-parallel to the direction of light incidence, while reflecting undesired light, i.e., that having a polarization orthogonal to the predetermined polarization, from the surface of the light polarizer. The undesired light is reflected in a direction that does not interfere with the intended operation of the device in which the Hendrix Prism is installed yet provides feedback to the system in which it is used.

An optical observation device with at least one visual observation beam path, includesan objective lens,an eyepiece,an Abbe König prism system, Porro prism system or Schmidt Pechan prism system, arranged in the at least one visual observation beam path between the objective lens and the eyepiece,a display device for displaying an additional image in the visual observation beam path to the observer, anda device for image superposition, which has a holographic optical element, and which uses the holographic optical element to superpose onto the image of the display device the image of a target object to be observed in an intermediate image plane of the visual observation beam path.The prism system is provided with the at least one holographic element of the at least one device for image superposition.

A double stage isolator is formed of a face-to-face slabs or sheets of materials that will suitably split, combine, non-reciprocally rotate to ensure isolation in a reverse direction from output ports to respective input ports of any light launched into the input ports. A right angled Porro-prism is disposed at an end of the affixed together slabs having planar faces to direct light launched in a folded fashion to the output ports. A half waveplate is used in addition to beam splitter combiners and non-reciprocal rotators means that rotate the light by 90 degrees so as to pass a single beam in a forward propagating direction and to interchange the polarization of two sub-beams that pass through from an output port to an input port in a reverse direction.

A double stage isolator is formed of face-to-face slabs or sheets of materials that will suitably split, combine, non-reciprocally rotate to ensure isolation in a reverse direction from output ports to respective input ports of any light launched into the input ports. A right angled Porro-prism is disposed at an end of the affixed together slabs having planar faces to direct light launched in a folded fashion to the output ports. A half waveplate is used in addition to beam splitter combiners and non-reciprocal rotators means that rotate the light by 90 degrees so as to pass a single beam in a forward propagating direction and to interchange the polarization of two sub-beams that pass through from an output port to an input port in a reverse direction.

The invention relates a beam rotating device with intensity changed by compensable polarization and a method, belonging to the field of optical technology. The device consists of a polarizing splitting prism, a 1 / 4 wave plate, a double refracted wave wafer and a porro prism. The invention adopts the revolving porro prism to realize the rotation of beams and adopts the double refracted wave wafer to compensate the porro prism, so as to eliminate the fluctuation of beam intensity caused by resolving the porro prism and further realize beam rotation without changing beam intensity. The invention has an application value in the field of optical information processing.

The invention discloses an asymmetric spatial heterodyne spectrometer structure, which comprises an incident diaphragm, a collimator objective, a blazed grating, an interference module integrated by prisms, an imaging lens and an array type detector, wherein the interference module integrated by the prisms is a core part of the spectrometer structure, and is formed by a right trapezoid prism and an isosceles triple prism. Incident light is diffracted through the grating so as to enter the interference module, and is divided into two light beams through a beam splitting interface so as to be reflected by a plane mirror and a porro prism in the interference module respectively, so that non-equal optical path space interference of the two light beams is realized. The asymmetric spatial heterodyne spectrometer structure provided by the invention only needs one grating, has the advantages of simple light path, convenience in adjustment, high spectral resolution and the like since the interference module is integrated by the prisms, can be beneficial to effectively improving the integration level and the stability of a system, and has a wide application prospect in the multi-spectral line high-precision doppler velocity measurement field.

A wide temperature range laser based on hexagon plate strip structure comprises a large power laser diode light source, two orthogonally placed porro prisms, a laser gain medium, a polarization beam splitter, 0.57 wave sheet and 1 / 4 wave sheet, wherein the laser gain medium is a hexagon plate strip structure formed by a rectangle together with an isosceles trapezoid; the large power laser diode light source comprises a plurality of conduction-cooled laser diode arrays; the orthogonally placed porro prisms, the laser gain medium, the polarization beam splitter, the 0.57 wave sheet and the 1 / 4 wave sheet are used to construct a resonant cavity for producing laser; and the 0.57 wave sheet and the 1 / 4 wave sheet are zero-order wave sheets outputting laser with corresponding wavelengths. According to the invention, the structure is compact; the performance is stable; and the wide temperature range laser can work stably under the condition of no cooling with the temperature range of minus 30 to plus 70 DEG C.

A full-reflection curved mirror features that the porro prisms are closely arranged on the full-reflection curved surface in such manner that the inclined surfaces of all porro prisms are in a same plane. Its advantages are no need of reflecting film, high reflectivity and optical effect, and long service life.

In a binocular telescope with an adjustable prism module, an eyepiece lens module, a prism module and an objective lens module are installed inside a telescope tube of the binocular telescope. The prism module includes a prism base, a first right-angle prism, a Porro prism, a second right-angle prism and a support base, and an exit surface of the first right-angle prism is connected with an incident surface of the Porro prism, and the second right-angle prism is set on the support base, and the incident surface of the second right-angle prism is attached to the Porro prism. The first and second right-angle prisms can be adjusted to change the angle of optical axes among the prism module, the eyepiece lens module and the objective lens module to prevent a distortion of the optical imaging.

An optical observation device with at least one visual observation beam path includes an objective lens, an eyepiece, an Abbe König prism system, a Porro prism system or a Schmidt Pechan prism system, arranged in the at least one visual observation beam path between the objective lens and the eyepiece, a display device for displaying an additional image in the visual observation beam path to the observer, and a device for image superposition, which has a holographic optical element, and which uses the holographic optical element to superpose onto the image of the display device the image of a target object to be observed in an intermediate image plane of the visual observation beam path. The prism system is provided with the at least one holographic element of the at least one device for image superposition.

The invention relates to an image reversion system (500) which enables an image reversion and beam transposition of a plurality of observation beam paths (503a, 503b, 504a and 504b) to be carried out simultaneously. The system includes at least one Porro prism system and is designed in such a way that it can be arranged in a convergent beam path. The inventive system is suitable as an image reversion system in an ancillary module for operational microscopes used in ophthalmoscopy due to the low overall height thereof.

The invention relates to a laser device for outputting flattened beams. The laser device comprises a reflection cavity mirror, a gain medium, a polarizing film, a phase adjustment mirror, a compensating lens and a Porro prism. The laser device utilizes a cavity to place the phase adjustment mirror, and the phase delay of endovascular laser is modulated radially through the polarizing film, the phase adjustment mirror and the Porro prism, so that the radial variation of coupling output rate of the polarizing film is realized, and the laser emergent through the polarizing film is a flattened beam with a flat middle part. Meanwhile, the compensating lens is adopted to eliminate the lens effect caused by inserting the phase adjustment mirror into the laser cavity. The laser device is simple in structure, less in loss, high in efficiency, and high in filling factors of the outputted beams.

The invention relates to a calibration system and calibration method for the double-collimation zero-position angle of an optical transmission device. The system has a simple structure and can efficiently calibrate the double-collimation zero-position angle of the optical transmission device under high and low temperature conditions. The system comprises an electronically controlled turntable, a double-sided mirror and a two-dimensional adjustment table arranged in a constant temperature test box and a first Porro prism device, a first multi-tooth indexing table, a second Porro prism device, asecond multi-tooth indexing table, a self-collimating theodolite, and a plane mirror.

A porro prism stabilized q-switched laser system including a gain material, a partial reflector optically connected to the gain material, an oscillating mirror operably connected to the gain material, and a porro prism optically connected to the oscillating mirror. The system has a first path located between the partial reflector and the oscillating mirror, and a second path located between the oscillating mirror and the porro prism. The stabilized laser system having larger alignment tolerances making for more stable and less expensive systems. The stabilized laser system having a shorter cavity length than traditional q-switched laser systems.

Described herein is a multiplexer / demultiplexer optical device (100) comprising: a first beam-splitter cube (BS1); a second beam-splitter cube (BS2) optically coupled to the first splitter (BS1); a first Porro-prism reflector (PR1), which is optically coupled to the second splitter (BS2); and a second Porro-prism reflector (PR2), which is optically coupled to the second splitter (BS2) and is structured for introducing into optical beams that traverse it a phase delay depending upon an orbital angular momentum of the optical beams and upon an orientation of the second reflector. The device is a Michelson interferometer structured for obtaining constructive / destructive interference such as to multiplex / demultiplex on / from corresponding input / output ports, on the basis of values of orbital angular momentum, an optical beam comprising a plurality of concentric optical beams with cylindrical symmetry having different values of orbital angular momentum.

The invention provides a satellite-borne high-energy dual-wavelength all-solid-state pulse laser which comprises an active Q-switched oscillator, a pre-power amplifier, a main power amplifier and a frequency multiplication module in sequence. The active Q-switched oscillator is a U-shaped resonant cavity. A first Porro prism, a first optical wedge, a first wave plate, a lath crystal, a first polarization splitting prism, a second polarization splitting prism, an electro-optic Q switch, a second wave plate, a second optical wedge, a second Porro prism and a pumping diode array arranged on the lath crystal, and the pre-power amplifier and the main power amplifier comprise a light beam shaping lens group. According to the invention, high-energy, high-stability and high-reliability pulse laser output can be realized, the size and weight of the laser are reduced, and the laser is suitable for multi-platform application, especially a satellite-borne platform, and can be used as a detection light source for satellite-borne aerosol detection laser radar, satellite-borne ranging laser radar and the like.

The invention relates to a vertical outer cavity surface emitting semiconductor laser. The laser comprises a pumping light source, a heat radiator, a Bragg reflector, working material, an outer cavity mirror, and an output coupling mirror, wherein the outer cavity mirror is a Porro prism, the bottom surface of the Porro prism is oppositely parallel to the surface of the working material and the output coupling mirror. The bottom surface of the Porro prism, the working material and the Bragg reflector form a resonant cavity, and the output coupling mirror, the Porro prism, the working material and the Bragg reflector also form a resonant cavity. The Porro prism has simple position adjustment. The inventive laser has excellent mechanical and thermal stability, and can still stably operate in the fieldwork environment with shock wave, vibration and large temperature variation.

A compact, lightweight, laser target designator uses a TIR bounce geometry to place an end-pumped gain element functionally in the center of the resonator path, thereby allowing the resonator path to be terminated by a pair of crossed Porro prisms, so that the designator produces a high quality beam that is insensitive to alignment and temperature, and is low in manufacturing cost. Some embodiments fold the Porro legs of the resonator path back toward the gain element for compactness. Embodiments use a single gain element as both an oscillator gain element with TIR and as an output amplifier gain element without TIR. Various embodiments use block optical elements in a planar layout on a standard support medium such as aluminum to facilitate automated manufacturing.

A compact, lightweight, laser target designator uses a TIR bounce geometry to place an end-pumped gain element functionally in the center of the resonator path, thereby allowing the resonator path to be terminated by a pair of crossed Porro prisms, so that the designator produces a high quality beam that is insensitive to alignment and temperature, and is low in manufacturing cost. Some embodiments fold the Porro legs of the resonator path back toward the gain element for compactness. Embodiments use a single gain element as both an oscillator gain element with TIR and as an output amplifier gain element without TIR. Various embodiments use block optical elements in a planar layout on a standard support medium such as aluminum to facilitate automated manufacturing.

The invention provides a tactical spotting scope optical system with a reticle-based ranging function, which is characterized in that a first lens of an objective lens, a second lens of the objective lens, a focusing lens of the objective lens, a Porro prism I, a Porro prism II, a reticle, a first compensation lens, a second compensation lens, a zoom lens I, a zoom lens II, a zoom lens III, a first lens of an eyepiece, a second lens of the eyepiece and a third lens of the eyepiece are sequentially arranged along an optical path; the focusing lens of the objective lens is a meniscus lens, the focal plane of the objective lens coincides with a first focal plane of the zoom eyepiece, and the dense ranging reticle is arranged at the coincidence position; the zoom lens I is a biconvex lens, the zoom lens II is a biconcave lens, and the convex surface of the zoom lens III faces the pupil; and the convex surface of the first lens of the eyepiece faces the pupil, the second lens of the eyepiece is a biconvex cemented lens, and the convex surface of the third lens of the eyepiece faces the object space. The focal plane of the objective lens and the first focal plane of the zoom eyepiece coincide with each other, and the reticle is arranged at the coincidence position, so that accurate ranging can be performed on an observed target by using the reticle in the whole zooming process.

The invention provides a display panel edge patrol inspection optical system, which comprises a light source arranged on one side of a display panel and used for providing incident light; the Porro prism is arranged on one side of the display panel, the rectangular face of the Porro prism is parallel to the display panel, when incident light enters the two inclined faces of the Porro prism, total reflection occurs twice, and the total reflection light returns in the direction of the original incident light; and the camera is used for simultaneously receiving the light reflected by the upper surface of the display panel and the light, totally reflected by the Porro prism, of the lower surface of the display panel, so that the camera can simultaneously carry out defect detection photographing on the upper surface and the lower surface of the display panel. According to the invention, the light is received by the camera after two times of total reflection from the lower surface of the display panel through the Porro prism, one camera and one set of light source are realized to carry out defect detection photographing on the upper surface and the lower surface of the display panel at the same time, the equipment cost is saved, the structural complexity is simplified, and the equipment switching and maintenance efficiency is greatly improved.

The invention provides a high-vibration-resistance kilohertz miniaturized laser, which comprises a pumping coupling module and a laser oscillation module arranged on the upper layer of the pumping coupling module, and is characterized in that the pumping coupling module comprises a laser diode stack, a waveguide shaping device, a cylindrical mirror, a second quarter-wave plate, a convex lens, a Dove prism and a second 45-degree dichroscope; the laser oscillation module comprises a Porro prism, a compensation wave plate, a laser crystal, a first 45-degree dichroscope, a 45-degree polarization plate beam splitter, a first quarter-wave plate, an electro-optical crystal and an output mirror. The laser oscillation module is arranged on the upper layer of the pumping coupling module, so that the size of the laser is reduced; the compressed pump light is changed into elliptically polarized light to inhibit the thermally induced birefringence depolarization effect of isotropic crystals; the laser oscillation module is a self-consistent laser oscillation cavity, has self-adaptation capacity in the x direction and the y direction at the same time, has large anti-vibration tolerance and meanwhile has a large angle compensation range. And a thermal control module is arranged for heat conduction temperature control.