713 results about "Partial reflection" patented technology

A sensor and method for page-based optical data storage. The sensor includes a partially-reflective mirror, a reflective mirror disposed substantially collinear with and spaced apart from the partially-reflective mirror, and an active layer disposed substantially collinear with and between the partially-reflective mirror and the reflective mirror. The partially-reflective mirror has a first and second side and transmits a portion of light incident on the first side. The reflective mirror reflects light incident on the reflective mirror toward the partially-reflective mirror. The active layer absorbs at least a portion of the light oscillating at the resonant frequency.

A laser distance ranging method includes splitting two combs of dual comb radiation into a signal radiation portion and a local oscillator radiation portion. The signal radiation portions are, after separation, combined into a combined signal radiation and directed onto an object, the distance to which is to be measured. The signal thrown back from the object is split into a first and second signal portions. The first signal portion is superimposed with the second local oscillator radiation portion to generate a first measurement signal, and the second signal portion is superimposed with the first local oscillator radiation portion to generate a second measurement signal. The distance to the object is determined from the first and second measurement signals, and from reference signals obtained by the partial reflection, wherein the Vernier effect can be used to extend ambiguity by comparison of the first and second measurement signals.

An apparatus includes a waveguide and one or more partially reflective surfaces embedded inside the waveguide, wherein each of the one or more partially reflective surfaces includes a multi-layer coating structure, wherein a first portion of the multi-layer coating structure induces an overall phase shift of light propagating through the first portion of the multi-layer coating structure and wherein a second portion of the multi-layer coating structure is selected to decrease the overall phase shift.

The invention discloses an optical waveguide and a preparation method thereof, relates to the technical field of optics, and is used for solving the problems of high processing difficulty, low yield and high cost of the existing array optical waveguide. The optical waveguide comprises a turning waveguide which is provided with a light incident surface, a first surface, a second surface and a plurality of first light splitting surfaces, the first surface and the second surface are arranged in parallel, the first light splitting surfaces are arranged in parallel, the included angle between the first light splitting surfaces and the first surface is smaller than 90 degrees, and the first light splitting surfaces enable light entering the turning waveguide from the light incident surface to be partially reflected; the reflected light is transmitted to the coupling-out waveguide; the coupling-out waveguide and the turning waveguide are spliced, so that light entering the coupling-out waveguide from the turning waveguide is emitted out of the coupling-out waveguide. The first beam splitting surface of the turning waveguide is not perpendicular to the first surface of the turning waveguide, compared with an existing array optical waveguide, the situation that the perpendicularity precision of the beam splitting surface and the surface of the optical waveguide needs to be strictly controlled in the machining process can be avoided, and therefore the machining difficulty can be lowered, the yield can be improved, and cost can be reduced.

An electronic device is provided. The electronic device includes a ring-shaped housing having an inner surface into which a finger of a user is inserted, a light-emitting unit configured to emit a light to the inner surface of the housing through a first region of the inner surface of the housing within the housing, a light-receiving unit configured to receive first light, which is a portion of the light reflected from an inside of the finger of the user, through a second region of the inner surface of the housing within the housing, and a coating layer, disposed between the first region and the second region, configured to reflect second light, which is distinct from the first light and is remaining portion of the light, to the finger of the user to transmit the second light to the light-receiving unit.

Base station antennas include a reflector, a first linear array of radiating elements extending forwardly from the reflector, the radiating elements in the first linear array configured to operate in a first frequency band, and a second linear array of radiating elements extending forwardly from the reflector, the radiating elements in the second linear array configured to operate in the first frequency band. These antennas further include an isolation wall that is positioned in between the first linear array of radiating elements and the second linear array of radiating elements. This isolation wall comprises at least one partially reflective surface that is configured to reflect, on average as a function of frequency, between 20% and 80% of incident radiation in the first frequency band.

The utility model discloses a visual system which comprises a lens cone, a lens group and a spacing element group, wherein the lens group and the spacing element group are assembled in the lens cone; the lens group comprises a first lens with positive focal power, a reflective polarization element, a first quarter-wave plate, a second lens with positive focal power, a third lens with negative focal power, a partial reflection element and a second quarter-wave plate which are sequentially arranged from the first side to the second side along the optical axis. The fourth lens has negative focal power; the spacing element group comprises a first spacing element, a second spacing element, a third spacing element and a fourth spacing element; wherein the number of the lenses with focal power in the lens group is four; the effective focal length f1 of the first lens and the effective focal length f of the visual system satisfy 1.5 lt; f1 / flt; 1.9); the combined focal length FG1 of the first lens, the reflective polarizing element and the first quarter-wave plate and the inner diameter d1s of the first side surface of the first spacing element meet the following conditions: 2.35 lt; fG1 / d1slt, FG1 / d1slt; and 2.75%.

The utility model discloses an optical imaging system. The optical imaging system comprises a lens cone, an imaging group and a second spacing element, wherein the imaging group and the second spacing element are arranged in the lens cone. The imaging group sequentially comprises a linear polarization film, a reflective polarization element, a quarter-wave plate, a first lens, a second lens, a third lens, a fourth lens and a partial reflection layer from the first side to the second side along the optical axis; wherein the first lens and the second lens are glued, and the third lens and the fourth lens are glued. The second spacer element is disposed on the second side of the second lens and is in contact with the second side of the second lens. Wherein the outer diameter D0m of the second side end face of the lens barrel and the outer diameter D2m of the second side face of the second spacing element meet the condition that D0m-D2m is larger than or equal to 4.51 mm and smaller than or equal to 5.8 mm; the inner diameter d2m of the second side surface of the second spacing element, the inner diameter d2s of the first side surface of the second spacing element, and the axial distance T23 from the second side surface of the second lens to the first side surface of the third lens satisfy the following formula: (d2m-d2s) / T23 is greater than or equal to 0.97 and less than or equal to 2.79.

A head-up display 700 has an eye-box and includes picture generating and viewer tracking units. The picture generating unit includes a display device and a waveguide 704. The display device outputs a

The invention discloses an array optical waveguide and a preparation method thereof, relates to the technical field of optics, and is used for solving the problems of high processing difficulty, low yield and high cost of the existing array optical waveguide. The turning waveguide is provided with a first surface and a second surface, a first area of the turning waveguide is provided with at least two first light splitting surfaces which are located between the first surface and the second surface and are parallel to each other, and the included angle between each first light splitting surface and the first surface is smaller than 90 degrees; the light enters the first light splitting surface to be partially reflected, and the reflected light is propagated to a second area of the coupling-out waveguide; the second area of the coupling-out waveguide enables the light to be emitted out of the array optical waveguide. Compared with an existing array optical waveguide, the array optical waveguide has the advantages that strict control of the perpendicularity precision of the light splitting surface and the surface of the optical waveguide during processing can be avoided, the processing difficulty can be reduced, the yield can be improved, and the cost can be reduced.

The utility model discloses an optical system. The optical system sequentially comprises a first lens, a reflective polarizing element, a first quarter-wave plate, a second lens, a third lens, a partial reflection element, a second quarter-wave plate, a polarizing film and a fourth lens from a first side to a second side along an optical axis, the first lens has positive focal power, and the first side surface of the first lens is a convex surface; the second lens has negative focal power, the first side surface of the second lens is a plane, and the second side surface is a concave surface; the second side surface of the third lens is a convex surface; the first side surface of the fourth lens is a plane; the effective focal length f1 of the first lens and the effective focal length f2 of the second lens meet the following formula:-0.7 lt; f1 / f2lt; -0.15, < = 0.15; the combined focal length fz2 of the second quarter-wave plate, the polaroid and the fourth lens and the curvature radius R8 of the second side face of the fourth lens meet the condition that fz2 / R8 is larger than or equal to-2.0 and smaller than or equal to-1.5.

The invention provides a low-noise speckle interference system and method based on a spatial light modulator, and relates to the technical field of speckle interference, and the system comprises a laser, a first beam splitter prism and an imaging element. A laser beam emitted by the laser is divided into transmission light and reflected light by the beam splitter prism I; after being reflected by the third beam splitter prism, part of the transmission light is irradiated on an imaging element as reference light; part of the reflected light sequentially passes through a linear polaroid and a half-wave plate, is modulated by a spatial light modulator assembly, irradiates a fourth beam splitter prism, and is reflected to the surface of a measured object to generate diffuse reflection, so that slow-reflection light is obtained; according to the speckle interference system, object light is modulated by using a spatial light modulator assembly, so that emergent light modulated by the spatial light modulator assembly irradiates a measured object at various illumination angles, mutually independent speckle fields are formed on a target surface of an imaging element, speckle decorrelation noise can be effectively inhibited after multiple times of measurement and superposition, and the measurement accuracy is improved. And the accuracy of subsequent measurement results is improved.

The disclosure relates to an optical system for an augmented reality apparatus, comprising: an image projection source; and a polarizing beam splitter. The polarizing beam splitter is arranged such that light emitted from the image projection source is able to be non-perpendicularly incident on the beam splitting side and be at least partially reflected. The polarizing beam splitter is configured such that a polarized light component passes through the polarizing beam splitter and is transmitted through the transmission side thereof, and a polarized light component is reflected from the beam splitting side. The optical system also comprises a polarizer disposed between the image projection source and the polarizing beam splitter, and the polarizer is configured to allow polarized light, whose polarization is in the second direction, to be transmitted therethrough and polarized light, whose polarization is in the first direction to be absorbed.

The utility model discloses a laser methane gas detection device, belongs to the technical field of gas detection, and solves the problem that a laser methane sensor is easily influenced by interference factors such as water mist and greasy dirt in air to interfere gas detection. Comprising a circuit board and a laser reflecting part, the laser reflecting part is installed on the surface of the circuit board, and a laser transmitter and a laser receiver are further installed on the surface of the circuit board; a grating partition plate is arranged in the laser reflecting part, and the laser transmitter and the laser receiver are distributed on the two sides of the grating partition plate; a cavity is formed in the laser reflecting piece, and laser emitted by the laser emitter is reflected to the laser receiver through the inner wall of the laser reflecting piece and the grating partition plate; according to the utility model, greasy dirt and water vapor existing in gas to be detected are filtered through the filter screen, scattered light emitted by laser beams and part of reflected light are shielded by utilizing the grating partition plate in the laser reflecting piece, and the measurement precision and accuracy of gas detection are improved.

The invention provides a self-reference speckle interference measuring system, and relates to an optical measuring system, the self-reference speckle interference measuring system comprises a laser beam generating device, an imaging lens, a first lens, a second lens, a first beam splitter prism, a second beam splitter prism, a first reflector, a second reflector, a diaphragm, a small hole and an imaging device, the laser beam generating device generates a laser beam and irradiates a measured object to form reflected light; part of the reflected light sequentially penetrates through the imaging lens and the first lens, then irradiates the first beam splitter prism and is divided into reflected light and penetrating light by the first beam splitter prism. Part of the reflected light is reflected by the reflector I, passes through the diaphragm, is reflected by the beam splitter prism II, passes through the lens II and is irradiated on an imaging surface of the imaging device; part of the penetrating light penetrates through the small hole, is reflected by the second reflector, then sequentially penetrates through the second beam splitter prism and the second lens and irradiates the imaging face of the imaging device. The technical problem that the air disturbance on the object light propagation path interferes the measurement result can be effectively solved.

A projector (10) for an augmented reality or mixed reality headset is disclosed, comprising: an emissive display (20) defining an optical axis (9), configured to provide first supplied light (40); an exit pupil (80) configured to couple the first supplied light into a waveguide for an augmented reality or mixed reality headset, the exit pupil comprising a first region (82); an optical arrangement (60) configured to couple the first supplied light from the emissive display towards the exit pupil; and an absorptive structure (70) at the emissive display arranged to absorb visible light reflected towards the emissive display from the exit pupil; wherein the emissive display is configured to provide the first supplied light to the optical arrangement off-centre with respect to the optical axis so that a first partial reflection (50) of the supplied light is coupled towards and absorbed by the absorptive structure.

The utility model discloses an object detection sensor and a detection method. Wherein the detection sensor comprises a light emitting part, a light guide channel, a light receiving part and a control part, and the light emitting part is used for emitting a light beam to a to-be-detected object platform; the light receiving part is used for receiving partially reflected light beams of the to-be-measured object platform; the light guide channel is used for guiding part of reflected light beams of the to-be-measured object platform to the light receiving part; the control part is connected with the light emitting part and the light receiving part and used for controlling photoelectric signal conversion of the light emitting part and the light receiving part. According to the utility model, the requirement on a to-be-detected object is greatly reduced, the detection application range is greatly increased, and the detection sensitivity and accuracy are high.

Methods and systems for configuring and rendering a fluorescent watermark may include modifying a non-partially reflective / absorptive UV ink from an original UV pattern by blending a minimum amount of partially reflective ink, and ensuring that the non-partially reflective / absorptive UV ink is rendered as part of a fluorescent watermark based on the non-partially reflective / absorptive UV ink. Modification of the non-partially reflecting / absorbing UV ink maintains the appearance of two or more pattern inks as a single color / pattern under office lighting. The fluorescent watermark may then be rendered on a substrate (e.g., paper or other material).

The utility model discloses an optical system and optical equipment comprising the same. The optical system sequentially comprises a first lens with positive focal power, a reflective polarizing element, a first quarter-wave plate, a second lens with negative focal power, a third lens with positive focal power, a partial reflection element, a fourth lens with negative focal power, a second quarter-wave plate and a polarizing film from a first side to a second side along an optical axis, the optical system further comprises a first spacing element and a second spacing element; the optical system satisfies 0.05 lt; cP1 / CP2lt; 0.75 [mu] m and-2.6 [mu] m; fG1 / (d1m + d2s) lt; cP1 is the maximum thickness of the first spacing element in the optical axis direction, CP2 is the maximum thickness of the second spacing element in the optical axis direction, FG1 is the combined focal length of the reflective polarizing element, the first quarter-wave plate and the second lens, d1m is the inner diameter of the second side face of the first spacing element, and d2s is the inner diameter of the first side face of the second spacing element.

The invention relates to a multi-path high-stability narrow-linewidth external cavity semiconductor laser and application thereof, and belongs to the technical field of lasers. The laser comprises two groups of external cavity light paths, Z-block beam combiners, partial reflectors and isolators, the two groups of external cavity light paths are arranged side by side, and the Z-block beam combiners, the partial reflectors and the isolators are sequentially arranged on the light emitting sides of the two groups of external cavity light paths; the external cavity optical path comprises a gain chip, a collimating lens, a polarization analyzer A, a polarization beam splitter, an F-P etalon and a narrow-band-pass filter which are sequentially arranged along the optical path. The polarization analyzer and the polarization beam splitter are arranged in the external cavity light path, main polarized light is kept to resonate in the external cavity light path, the polarization suppression ratio of the external cavity light path is improved, non-dominant mode noise is suppressed, and the line width is reduced; the mode jump risk is reduced, the device life is prolonged, and the power stability is improved; the beam quality is improved; and the polarization dependent loss in a light path is reduced.

A vehicular head-up display (HUD) for displaying an image to a user of a vehicle having a windshield (15) includes an image projector (14) outputting a collimated image and an optical aperture expander. The optical aperture expander includes a light-guide optical element (LOE) (10) having two major external surfaces (30a, 30b). The image projector (14) injects the collimated image so as to propagate within the LOE by internal reflection at the major external surfaces. The LOE also has a set of parallel partially-reflecting internal surfaces (12) which progressively couple out the image illumination from the LOE. The optical aperture expander is deployed such that the image illumination coupled-out of the LOE (12) follows a light path including a reflection from a surface associated with the windshield (15) of the vehicle so as to be visible to the user while the user looks at a scene beyond the windshield.

A head-up display comprising a picture generating unit and a viewer tracking unit The picture generating unit comprises a display device and a waveguide. The display device is arranged to output a wavefront such as a holographic wavefront. The waveguide is arranged to receive the wavefront from the display device. The waveguide is further arranged to output an array of replicas of the wavefront to form an expanded or extended wavefront. The viewer tracking unit comprises a light source and a detector. The light source is arranged to illuminate at least a portion of the eye-box. The detector is arranged to detect light of the light source reflected from the illuminated portion of the eye-box. The waveguide is disposed between the detector and eye-box. An optical axis of the detector is aligned with an optical axis of the picture generating unit. The optical axis is associated with a gut ray of the wavefront.

The invention relates to a method for spatial location and spectral imaging of microparticles (202) in a sample (200). This method comprises the following steps:A) illuminating the sample by an annular lighting cone (124) coming from a light beam partly reflected by an annular mirror (13) and focused by a peripheral region (142) of a dark-field microscope objective (14),B) recording a dark-field microscopy image, the latter being collected by a central region (144) of the objective,C) locating points of interest in the image,D) extracting coordinates of the points of interest, in order to form a list of points,E) moving the sample, to scan one of the extracted points,F) illuminating the point on the sample using a laser beam transmitted through the annular mirror and focused by the central region of the dark-field microscope objective,G) collecting an emitted Raman spectrum by the central region of the objective.The invention therefore relates to an associated system.

The utility model discloses a visual system, which comprises a lens barrel, and a first lens, a reflective polarizing element, a quarter-wave plate, a second lens, a third lens and a partial reflection element which are assembled in the lens barrel and are sequentially arranged from a first side to a second side along an optical axis, the second lens has positive focal power and a plano-convex surface type, and the second side surface of the third lens is a convex surface; a first spacing element is arranged between the first lens and the second lens, and a second spacing element is arranged between the second lens and the third lens. The curvature radius R1 of the first side face of the first lens and the outer diameter D0s of the end face of the first side of the lens barrel meet the condition that R1 / D0s is larger than or equal to 1.37 and smaller than or equal to 1.80. The outer diameter D1s and the inner diameter d1s of the first side face of the first spacing element and the center thickness CT1 of the first lens meet the condition that (D1s-d1s) / CT1 is larger than or equal to 0.14 and smaller than or equal to 2.04. The axial distance EP01 from the first side end face of the lens barrel to the first side face of the first spacer element, the maximum thickness CP1 of the first spacer element and the axial distance EP12 of the first spacer element and the second spacer element satisfy 0.99 < = (EP01 + CP1) / EP12 < = 2.47.

An extremely fast optical measurement method combines a chromatic confocal distance measurement with a chromatic confocal color measurement of a partially reflective test surface. A corresponding measuring device uses at least two monochromatic emitters, particularly single- or multi-mode laser diodes, as a light source.

A system for frequency conversion of laser pump radiation includes an optical element for frequency conversion of lasers or laser beams with power scalability. The element has a nonlinear birefringent, thin plate crystal. A pump beam generates frequency-shifted radiation. Phase or quasi-phase matching conditions are in the crystal between beams. Frontside and backside of the crystal have high-reflective and partially-reflective coatings, obtaining intensity enhancement of the pump and frequency-converted radiation, and maintaining relative phase delay between beams, maximizing conversion efficiency. The crystal contacts a heat sink through the high-reflective coating, minimizing temperature inhomogeneity in the crystal. Intrinsic longitudinal heat flow provides power scalability. The element, used intra-cavity, acts as a wavelength-selective component forcing laser operation on resonance of the element, maximizing frequency conversion. The wavelength selectivity allows single-frequency operation of high-power lasers with intra-cavity frequency conversion.

The utility model discloses a visual system. The visual system comprises a first lens cone and a second lens cone which are sequentially arranged from a first side to a second side along an optical axis, and a first lens group and a second lens group which are respectively supported on the two lens cones, the first lens group sequentially comprises a first lens, a reflective polarizing element and a quarter-wave plate, and the second lens group sequentially comprises a second lens, a partial reflection element and a third lens; the focal power of the first lens and the second lens is positive, the surface types of the first lens and the third lens are convex and concave-convex respectively, and the second side surface of the second lens is a convex surface; the second lens and the third lens are glued; the second lens group can move along the optical axis to be close to or far away from the display on the second side, so that the system is switched between the first state and the second state; the visual system satisfies the following conditional expressions: 0.33 < = (fz / f23) * (La / Lb) < = 1.10 and 0.75 mmlt; (dbs / dam) * [delta] flt; and the thickness is 1.95 mm.

A display device according to one embodiment of the present disclosure includes: a base layer including a display area; a circuit layer including a conductive pattern in a pixel area of the display area; a first insulating film on the circuit layer, the first insulating film being opened in a contact portion on the conductive pattern; a reflective film on the first insulating film and including a first opening that corresponds to the contact portion; a second insulating film on the reflective film and including a second opening overlapping the first opening; and a display layer on the second insulating film, connected to the conductive pattern through the contact portion, and including a first electrode, a second electrode, and a light-emitting element overlapping the reflective film, wherein, in the contact portion, the reflective film has a wider opening than the second insulating film.

The invention provides a waveguide structure, a near-to-eye display device and a use method of the near-to-eye display device. The waveguide structure comprises a first waveguide and a second waveguide which are stacked, a coupling structure is arranged on the first waveguide; a plurality of first partial transmission and partial reflection mirrors are obliquely arranged in the first waveguide; the interior of the second waveguide is divided into areas corresponding to the first transmission partial reflectors; a plurality of mirrors are arranged in each region, and the included angles between the mirrors in the plurality of regions and the total internal reflection surface are gradually increased; and the control switch is corresponding to each area, and when any control switch is turned on, the light can be transmitted from the first waveguide to the corresponding area in the second waveguide. According to the technical scheme, the two waveguide layers are stacked, the control switch is used for controlling the light to enter the different areas of the second waveguide layer, and the mirrors with different inclination angles are arranged in the different areas, so that the different areas of the image can be coupled out of the second waveguide layer through the mirrors in the different areas in the second waveguide layer, and the field angle is increased.