61 results about "Double reflection" patented technology

According to the large-depth-diameter-ratio micropore laser rotary-cutting precision machining system and method, light beam self-rotation and light beam scanning are achieved through a compact rotating assembly integrating a Dove prism and double reflectors, the off-axis angle and the off-axis amount are precisely regulated and controlled through deflection and movement of the reflectors, light beams are subjected to off-axis focusing through a focusing assembly, and the precision of laser rotary-cutting precision machining is achieved. Finally, a light path focusing mode of first converging and then off-axis focusing is formed, large-depth-diameter-ratio micropore machining is achieved, the aperture range is dozens of micrometers to several millimeters, and the maximum depth-diameter ratio can reach 15: 1 or above; the device is compact in structure, a complex adjusting system is not needed, the control mode is simple, high rotating speed can be achieved, ultra-short pulse time domain broadening is reduced through the double-reflector system, and machining of hole patterns such as steep straight holes and taper holes can be achieved.

The invention belongs to the technical field of antennas, and particularly relates to a structure and a method for adjusting the position of an auxiliary reflecting surface of a double-reflecting-surface antenna. The device comprises an auxiliary reflecting surface, the auxiliary reflecting surface is provided with a rectangular boss, the rectangular boss is sleeved with an X-direction adjusting plate, the X-direction adjusting plate is connected with an X-direction adjusting screw, and the X-direction adjusting screw is in contact with the rectangular boss; the upper portion of the X-direction adjusting plate is sleeved with a Y-direction adjusting plate, the Y-direction adjusting plate is connected with a Y-direction adjusting screw, and the Y-direction adjusting screw makes contact with the X-direction adjusting plate. An installation cylinder is arranged on the upper portion of the Y-direction adjusting plate and connected with a fixing column, the fixing column is sleeved with a fixing barrel, the fixing barrel is connected with a Z-direction adjusting screw, and the Z-direction adjusting screw makes contact with the fixing column. The fixed cylinder is connected with a Z-direction adjusting plate; the Z-direction adjusting plate is connected with one end, far away from the main reflecting surface, of a supporting rod of the antenna; a Z-direction compression spring is arranged between the fixing column and the Z-direction adjusting plate. The invention provides a structure and a method for adjusting the position of an auxiliary reflecting surface of a double-reflecting-surface antenna, which are used for respectively adjusting and locking the position of the auxiliary reflecting surface along the radial direction (X direction and Y direction) and the axial direction (Z direction) of the antenna so as to solve the engineering problem of adjusting the position of the auxiliary reflecting surface of some high-frequency-band high-precision double-reflecting-surface antennas.

The utility model provides a gas detection device based on NDIR, which comprises a PCB (printed circuit board), a bottom plate and an upper cover, the upper cover is provided with an optical cavity, the periphery of the bottom plate is embedded with the inner wall of a coaming to seal the optical cavity, the bottom plate is provided with a first through hole and a second through hole, an infrared light source on the PCB penetrates through the first through hole to extend into the optical cavity, and the infrared light source on the PCB penetrates through the second through hole to extend into the optical cavity. The dual-channel infrared sensor penetrates through the second through hole and extends into the light cavity; the dual-channel infrared sensor is provided with a first channel and a second channel, the cover plate is provided with a V-shaped reflecting plate and a light gathering plate, the light gathering plate is provided with a first reflecting surface corresponding to the first channel and a second reflecting surface corresponding to the second channel, the two sides of the light gathering plate are respectively provided with a main detection air hole, and the cover plate is provided with a plurality of auxiliary detection air holes. On the basis of an original main detection gas hole, a plurality of auxiliary detection gas holes are additionally formed in the cover plate, the gas exchange rate is increased, meanwhile, the light gathering plate is designed to be provided with double reflecting surfaces, and the increase of infrared light loss caused by the auxiliary detection gas holes is made up.

The invention discloses an intelligent laser collimation system, which realizes automatic collimation of a laser beam through cooperative control of double reflectors, a high-precision electric actuator and an SAC reinforcement learning algorithm, adopts a cage type integrated structure design of double reflectors and a coaxial connecting rod, realizes rigid constraint and rapid alignment of a light path, and improves the accuracy of laser collimation. A reflector double-axis precise automatic adjusting mechanism based on a miniature electric actuator is developed, an SAC reinforcement learning algorithm is applied to an optical collimation system for the first time, a dynamic reward function design based on light spot offset is proposed, a double-reflector cooperative control model, a light spot offset real-time feedback mechanism and a self-adaptive parameter adjusting strategy are creatively adopted, and the optical collimation system is optimized. Alignment and collimation of laser beams are achieved, a geometric parametric modeling method based on a reflector is developed, related offset can be obtained through theoretical calculation without additional detection through geometric parametric modeling, the adjustment precision is improved to the micron order, and the operation complexity is remarkably reduced.

The invention discloses a natural light-based distributed phototherapy device and a use method, the natural light-based distributed phototherapy device comprises a box body, a light condensation assembly, a prism group, a beam splitter and a phototherapy assembly, a concave mirror and a reflector form a double-reflection light condensation system, the natural light is reflected twice and concentrated to a light hole, and the light hole is formed by a light source and a light source; by arranging the convex lens which slides vertically in the box body, physical adjustment of the focusing degree of light beams can be achieved, the vertical distance between the convex lens and the light hole can be changed by sliding the convex lens, and the focusing degree of the light beams can be adjusted. And the distance between the light rays converged by the convex lens and the prism group can be adjusted, and when the convex lens moves upwards to be close to the light hole, the light rays are focused, and the convex lens moves downwards to be away from the light hole, light beam divergence and sliding of the convex lens can achieve linear adjustment of light intensity, and different treatment requirements are met.

The invention discloses a rapid double-reflection non-vision-field imaging method based on important light screening, and the method comprises the steps: carrying out the calibration of a sampling system based on an NLOS scene, and determining the size of a to-be-reconstructed space; changing a laser light path illumination hidden space, obtaining a shadow image generated by active illumination, and processing the shadow image based on calibration information to obtain a pose and shadow binary image under three-dimensional coordinates; carrying out light ray modeling based on a double-reflection NLOS scene, and building a three-dimensional reconstruction network of a shadow scene; sampling the shadow binary image by using a multi-resolution sampling method based on edge intensity; inputting the sampled shadow binary image and the pose into a reconstruction network for training; dynamically sampling the obtained shadow binary image by using a difference light sampling method; and three-dimensional reconstruction of the NLOS dynamic scene is realized. According to the method, low delay is realized in the aspect of reflecting dynamic change of a scene, and reconstruction of a moving object is completed.

An optical system (1) includes a lightguide (100) and an image projector (200). A coupling-in configuration includes a first planar reflector (250) forming an acute angle [3 with a major surface (101) of the lightguide and extending across a thickness h of the lightguide, and a second planar reflector (271) external to the lightguide and inclined at an angle 2|3 thereto. Light rays passing through a first part (Di) of the projector exit aperture impinge directly on the first planar reflector (250) and are reflected to impinge on major surface (101) of the lightguide at a first angle of incidence and light rays passing through a second part (D2) of the projector exit aperture impinge on the second planar reflector (271), are reflected towards the first planar reflector (150) and impinge on the second major surface (102) at the same angle of incidence.

An optical path integrated structure based on an atomic force microscope includes: a substrate for providing a supporting base; a stage assembly, arranged on the substrate for placing an object to be measured; a laser generating assembly, arranged on the substrate for emitting a laser beam; a first reflecting assembly, arranged on the substrate for reflecting the laser beam generated by the laser generating assembly to the stage assembly; a second reflecting assembly, arranged on the substrate for reflecting the laser beam reflected back from the stage assembly to a detector unit; a detector unit, arranged on the substrate for receiving the laser beam reflected from the second reflecting assembly and sensing the landing position of the laser beam. The beneficial effect of the present invention is that the structure of the present invention can be precisely positioned by a double reflecting mirror, and the positioning accuracy can reach the nanometer level. The stage assembly and the probe adjuster can realize more subtle and precise control of the movement of the probe, saving a lot of optical path adjustment time, so that the experimental efficiency is improved.

The invention discloses an integrated system suitable for multi-mode polarization interference grating exposure. The integrated system comprises a laser, a collimation and beam expansion system, a first polarization regulation and control unit, a second polarization regulation and control unit, a first variable diaphragm, a second variable diaphragm, a space light absorption plate, a first reflection optical module, a second reflection optical module and a substrate. The invention aims to realize a more compact, stable and easy-to-adjust high-precision exposure device by simplifying an optical path structure, unifying an optical path and introducing a spatial partition polarization modulation mode. The system does not depend on a traditional PBS beam splitting structure any more, a needed interference field is directly generated through a single-beam expansion laser source, a symmetrical double-reflection interference structure is adopted, and the symmetry and stability of the system are greatly improved.

The invention relates to an interrogator system for interrogating fiber based sensors. The system comprises a broadband excitation light source illuminating a first lead fiber section having a wavelength shift response generating optical waveguide sensor, and a second lead fiber section having an in-line two reflectors based fiber interferometer sensor. The system also includes a detection 3 x 3 interferometer having an optical path difference arranged to match the wavelength shift response generating optical waveguide sensor and the in-line two reflectors based fiber interferometer sensor.

The present invention discloses an S / X dual-frequency dual-tracking feed network, belonging to the field of ring-focus dual-reflector antennas. The present invention includes an S / X dual-frequency feed and an S-band self-tracking feed network and an X-band self-tracking feed network connected to the S / X dual-frequency feed. The rightmost end of the S / X dual-frequency feed is an S-band signal open radiation cavity section. A circular choke groove centered on the open radiation cavity section is provided on the right surface of the S / X dual-frequency feed. The X-band self-tracking feed network is a TE21 mode coupler of a small-hole coupling type; the S-band self-tracking feed network includes a differential signal polarization synthesis network, eight cables and eight coaxial probes; one end of the coaxial probe is inserted into the circular choke groove; the other end is connected to the differential signal polarization synthesis network through a cable. The present invention can achieve the TE21 mode tracking function in the S / X bands, and also has the advantages of compact structure, easy processing, excellent electrical performance, etc., and can meet the requirements of the ring-focus dual-reflector antenna system.

The utility model discloses a novel energy -conserving lamp, through the combination structure of split type stepped radiator and annular auxiliary radiator, cooperate the hinged design of double reflection cover, realize the combination of high -efficient heat dissipation and accurate light distribution. The main radiator adopts the stepped fin structure of three -level gradual change spacing, and the auxiliary radiator is equipped with annular fin group, and the reflection cover assembly includes relatively rotatable inner and outer double cover bodies, and realizes 0~120 degree stepless regulation through slide rail type angle adjusting mechanism. The structure can make the lamp operating temperature reduce by 30% or more, and the light efficiency utilization rate is improved by 45%, and simultaneously realizes the lightweight of lamp structure.

The invention relates to an expandable rotating paraboloid double-reflector system SAR (Synthetic Aperture Radar) antenna, belongs to the technical field of spacecraft antennas, and solves the technical problems that the expandable rotating paraboloid double-reflector system SAR antenna is large in folding envelope and low in profile precision. The SAR antenna comprises a reflector and a phased array feed source device, the reflector comprises a main reflector body, an auxiliary reflector body and a conical force bearing barrel, the main reflector body is of a rotating paraboloid structure after being unfolded, the auxiliary reflector body is located on the inner side of the rotating paraboloid structure and connected with the main reflector body through the conical force bearing barrel, and the conical force bearing barrel is connected with the main reflector body. The phased array feed source device is arranged in the conical force bearing barrel, the phased array feed source device comprises a horn radiation unit, a T / R assembly and a heat conduction table, the cross section of the heat conduction table is of an axial symmetry structure shaped like a Chinese character'ji ', and the phased array feed source device is fixedly connected with an upper cabin plate of a load cabin of a satellite through the bottom face of a heat conduction table unit. The SAR antenna is high in precision, small in size, good in heat dissipation effect and high in stability.

The utility model relates to the technical field of tunnel construction measurement and monitoring measurement, in particular to a double-reflector-plate support for measurement, which comprises a base, a mounting hole is formed in the bottom surface of the base, a positioning screw hole communicated with the mounting hole is formed in the left side surface of the base, a positioning panel is arranged above the base, and a through hole is formed in the middle of the positioning panel. A positioning clamping groove is formed in the top of the positioning panel, a positioning insertion plate is inserted into the positioning clamping groove, reflection pieces are bonded to the front face and the back face of the positioning insertion plate, and the centers of the reflection pieces are concentric with the through hole; the device is installed on an embedded steel bar on the side wall of the tunnel through the installation holes, and can be fixed through the positioning screws after the orientation of the reflector plate is adjusted, so that quick disassembly and assembly can be realized; a double-sided reflector plate is adhered to the positioning insertion plate, so that bidirectional monitoring and measurement can be realized; the device is simple in structure, low in manufacturing cost and convenient to install, and the cost is greatly saved on the premise that the quality of tunnel monitoring and measuring work is guaranteed by putting the device into use.

The invention relates to a chip structure for improving light efficiency. The chip structure comprises a light-emitting device composed of a first semiconductor layer, a second semiconductor layer and an active layer. The active layer is located between the first semiconductor layer and the second semiconductor layer; the first recess penetrates through the second semiconductor layer and the active layer and extends to the interior of the first semiconductor layer and the second recesses on the two sides, the first recess is located in the first area, and the second recesses are located in the second area; the second reflecting layer is mostly in contact with the surface of the second insulating layer and is electrically connected with the first semiconductor layer, and the second reflecting layer is filled in the first recess and partially covers the second recess; covering a second reflecting layer in a region which is not covered by the first reflecting layer in the first region; and the second reflecting layer covers the surface of the second insulating layer in the second region. According to the invention, a double-reflecting-layer structural design is adopted, and a new reflecting layer is introduced into the non-light-emitting area, so that the non-light-emitting area also has a reflecting effect, and the light-emitting efficiency of the whole device can be further improved.

The utility model belongs to the technical field of vehicle-mounted head-up display, and particularly relates to a double-focal-plane HUD system plated with a polarization selection type reflecting film and a vehicle, the double-focal-plane HUD system plated with the polarization selection type reflecting film comprises an image generation unit, a primary reflecting mirror, a secondary reflecting mirror and a windshield, and the light-emitting end of the image generation unit is arranged towards the primary reflecting mirror; the secondary reflector comprises a first-layer structure and a second-layer structure which are overlapped, a first type polarization reflecting film is arranged on the surface of the first-layer structure, a second type polarization reflecting film is arranged on the surface of the second-layer structure, the windshield glass is located above the secondary reflector, the first type polarization reflecting film faces the windshield glass, and the second type polarization reflecting film faces the second-layer structure. A light path is folded in a two-time reflection mode, the linear distance of the light path is reduced, and the problem that the space in front of a steering wheel is insufficient is solved; the secondary reflector adopts the first layer structure and the second layer structure which are arranged in an overlapped mode, the double-focal-plane effect is achieved with a smaller size through the two polarization reflecting films, and two sets of optical systems do not need to be designed.

The application discloses a non-line-of-sight vehicle target multipath perception and positioning method and device based on an OFDM signal. Utilizing a base station multi-antenna received sensing integrated signal, after static clutter suppression, candidate propagation paths are extracted in a time delay, Doppler and angle of arrival joint parameter space; according to reflection geometric constraints in a T-shaped road, the candidate paths are divided into direct paths, first wall surface first-order reflection paths, second wall surface first-order reflection paths and interference paths; a multi-target path association and pairing scoring function is established according to time delay consistency, angle consistency, Doppler consistency, path energy credibility and reflection geometric residual, adaptive pairing of multiple target corresponding reflection paths is realized; according to the pairing result, a single reflection path positioning or double reflection path weighted fusion positioning mode is adopted to estimate the position and speed of each target. The application can improve the stability and path association accuracy of multi-target positioning and speed measurement in a non-line-of-sight and weak line-of-sight mixed scene of an urban road.

The invention provides a two-color off-axis reflection type laser beam expanding lens for space, which comprises a transition plate module, a primary lens chamber, a primary lens barrel, a primary lens module, a first folding lens module, a second folding lens module and a secondary lens module, the first folding mirror module and the second folding mirror module enable light emitted by the two-color laser to be subjected to 90-degree folding twice, then an emergent optical axis is matched with geometric mechanical axes of the primary mirror module and the secondary mirror module, off-axis laser emission is completed, and a primary mirror in the primary mirror module and a secondary mirror in the secondary mirror module are parabolic reflecting surfaces and are plated with polarization-maintaining dielectric films. The output light of the second refraction mirror module is reflected by the secondary mirror and the primary mirror in sequence and then is emitted in a beam expanding mode, and the emergent light is quasi-parallel light. The off-axis clamping type double reflectors are used, chromatic aberration correction is not needed, a light path is not shielded, the system efficiency is guaranteed, no returned laser enters the laser, and the service life of the system is guaranteed; through thermodynamic structure simulation, the whole machine structure design is guided, the system environment adaptability is improved, the service life is prolonged, and the system thermal control cost is reduced.

This invention discloses an SOA-DFB mutually coupled dual-feedback hybrid integrated chaotic semiconductor laser, relating to the field of semiconductor optoelectronic integration technology. The laser comprises a DFB laser chip, an SOA chip, a collimating lens, and a double-reflection transmission mirror arranged sequentially and coaxially. By adding an active device, the SOA chip, directly coupled to the DFB laser chip, the invention utilizes the broadband ASE noise generated by the SOA chip to inject backward into the DFB laser chip, causing disturbances to the optical field and intercarrier interactions within the laser. Simultaneously, combined with the strong-weak imbalance dual-cavity competition mechanism caused by the short and long external cavities formed by the front and rear reflecting surfaces of the double-reflection transmission mirror, the periodicity of a single feedback loop is effectively broken. This allows for the realization of high-bandwidth, low-delay, and high-power chaotic laser output without the need for complex optical injection systems and expensive optical isolators, offering advantages such as small size, low cost, high integration, and good stability.

The application provides a spatial dual-color off-axis reflective laser beam expander lens, which comprises a transition plate module, a main mirror chamber, a main mirror barrel, a main mirror module, a first folding mirror module, a second folding mirror module and a secondary mirror module. The first folding mirror module and the second folding mirror module make the light emitted by the dual-color laser to be folded twice by 90 degrees, and then match the outgoing light axis with the geometric mechanical axis of the main mirror module and the secondary mirror module, thereby completing off-axis emission of the laser. The main mirror in the main mirror module and the secondary mirror in the secondary mirror module are both parabolic reflecting surfaces and are both coated with a polarization maintaining dielectric film. The output light of the second folding mirror module is expanded and emitted after being reflected by the secondary mirror and the main mirror in turn, and the emitted light is quasi-parallel light. The application uses an off-axis cassette type dual-reflection mirror, does not need to correct chromatic aberration, has no obstruction on the light path, ensures the system efficiency and has no return laser entering the laser interior, thereby ensuring the system life. Through thermodynamic structure simulation, the whole machine structure design is guided, the system environmental adaptability and service life are improved, and the system thermal control cost is reduced.

The application discloses a kind of fast double reflection non-visual area imaging methods based on important light screening, which comprises: based on NLOS scene, calibrating sampling system, determine the size of the space to be reconstructed;Change laser light path illumination hidden space, obtain the shadow image generated by active illumination, process the shadow image based on calibration information, get the pose and shadow binary image under three-dimensional coordinates;Based on double reflection NLOS scene, light modeling is carried out, and the three-dimensional reconstruction network of shadow scene is built;The shadow binary image is sampled using a multi-resolution sampling method based on edge intensity;The shadow binary image after sampling is input into the reconstruction network for training with the pose;The shadow binary image obtained is dynamically sampled using a difference light sampling method;The three-dimensional reconstruction of NLOS dynamic scene is realized.The application realizes low delay in reflecting the dynamic change of the scene and completes the reconstruction of the moving object.

The invention provides a fruit detection device, a parameter setting method and equipment thereof and a medium. The device comprises a single camera; the double-channel conveying belt is used for bearing and conveying to-be-detected fruits; the two groups of multi-angle reflecting mirror systems are respectively arranged below the two sides of the double-channel conveying belt, each group of multi-angle reflecting mirror systems comprises a primary reflecting mirror and a secondary reflecting mirror, and reflected light paths of the fruits to be detected are converged to the single camera through twice reflection; wherein the device forms direct imaging, single reflection imaging and double reflection imaging through the first-stage reflector and the second-stage reflector, and the direct imaging, the single reflection imaging and the double reflection imaging correspond to a top visual angle image, a side visual angle image and a bottom visual angle image of a fruit to be detected respectively. And carrying out appearance size and surface defect detection on the to-be-detected fruit. The invention provides a concise fruit detection device, which reduces the hardware cost and improves the detection efficiency and accuracy at the same time.

To provide an optical instrument for viewing a nearby object as a mirror image located farther away.SOLUTION: An object (6) such as a book or a game console is placed under a housing (1), and a light source (5) illuminates the object (6). Through double reflection by a half-transparent half-reflective mirror (3) and a reflective mirror (4), a user can view an image of the object located farther away in front of the housing (1). Adjusting a support member (2) can change the height of the housing (1), and changing the distance between the reflective mirror (4) and the object (6) can adjust the distance between the eyes of the user and the image of the object (6). Through double reflection, the image appears to be located farther away from the user. This allows the eyes of the user to remain in a state of viewing a distant object even when the user is looking at a nearby object (6), thereby reducing eye strain and preventing myopia.SELECTED DRAWING: Figure 1

A fully automatic double reflection microscopic detection observation device and method, relating to the field of intelligent control. The invention solves the problem that the observation method in the prior art is to observe the culture dish by single reflection and side transmission, and can only observe limited positions without the function of accurately analyzing the results. The device includes: an upper observation module for collecting image information in the upward direction; an intermediate receiving module for connecting the upper observation module and the lower observation module; a lower observation module for collecting image information in the downward direction; a top Z-axis focusing function module for determining whether the image in the upper optical module is clear when the microscope head moves upward; a bottom Z-axis focusing function module for determining whether the image information in the lower optical module collected when the microscope head moves downward is clear; a main control center for analyzing and processing images at different positions obtained by the upper optical module and the lower optical module. It is suitable for use in hospitals, laboratories, and the vaccine industry.

The utility model discloses a spectrograph based on a double-plane reflection grating, and belongs to the technical field of spectrographs. The first plane reflection grating and the second plane reflection grating which are adjacently distributed are arranged in the spectrograph, light rays are subjected to secondary light splitting through the two plane reflection gratings, on the basis that the resolution of the spectrograph is guaranteed, a focusing lens with a large focal length does not need to be adopted, the overall size of the spectrograph is effectively reduced, the manufacturing cost is saved, and the cost is reduced. And the miniaturization design of the spectrograph is facilitated. In addition, the diffraction angle is increased by using the double reflection gratings, the problem that the diffraction angle of the near-infrared light for the high-scale density of the reflection gratings is small is solved, and the diffraction efficiency of the near-infrared light is improved.

A laser measurement system including a laser transmitter and a laser receiver is provided. The laser transmitter includes a reflective surface and one or more laser sources for projecting an initial laser pulse. The laser receiver includes a first reflective surface for reflecting the initial laser pulse to provide a first reflected laser pulse, and a second reflective surface for reflecting the initial laser pulse to provide a second reflected laser pulse. The laser receiver also includes a photodetection unit for receiving: 1) a first double-reflected laser pulse generated by reflecting the first reflected laser pulse from the reflective surface of the laser transmitter, and 2) a second double-reflected laser pulse generated by reflecting the second reflected laser pulse from the reflective surface of the laser transmitter. The laser receiver determines an orientation angle associated with the laser receiver based on the first and second double-reflected laser pulses.

The invention provides a back reflection dodging module, a lamp and a backlight source, the back reflection dodging module comprises a light source and a transflective part, the back reflection dodging module takes the light emitting surface orientation of the light source as the light emitting direction, the transflective part is arranged on the light emitting path of the light source, and the transflective part is arranged on the light emitting path of the light source. The light source is provided with a light emitting face and a light transmitting face protruding towards the light emitting face of the light source, so that when light of the light source is projected to the light transmitting face, the light is reversely reflected by the light transmitting face in the direction opposite to the light emitting direction and then is emitted in the light emitting direction through secondary reflection, and the illumination area is enlarged based on double reflection of the light in the axial direction. The dependence on a complex curved lens is reduced, the structure of the back reflection dodging module is simplified, the cost of the back reflection dodging module is reduced, and the production efficiency is improved.

Disclosed in the present invention is an integrated system applicable to multi-mode polarization interference grating exposure. The system comprises: a laser, a collimation and beam expansion system, a first polarization regulation and control unit, a second polarization regulation and control unit, a first variable aperture, a second variable aperture, a spatial light absorption plate, a first reflective optical module, a second reflective optical module and a substrate. The present invention aims to realize a more compact, stable and easily adjustable high-precision exposure apparatus by simplifying an optical path structure, unifying an optical path length and introducing a spatially partitioned polarization modulation method. By no longer relying on traditional PBS beam-splitting structures, the system directly generates a required interference field by means of a single-beam expanded laser source, and uses a symmetric dual-reflection interference structure, thereby greatly enhancing the symmetry and stability of the system.

A two-mirror assembly, which includes a first mirror which is an aspherical mirror, a second mirror located away from the first mirror, and an open cavity formed between the first mirror and the second mirror. Embodiments of the invention provide open cavities that are stable cavities including a direct injection stability and a real ray stability.

The invention relates to different variants of reflectors (220), which alone or together with a light unit (210) also described form a space-saving high-luminosity system.