21 results about "Dielectric mirror" patented technology

A radiation-emitting device includes an optoelectronic component for emitting first electromagnetic radiation. The radiation-emitting device also includes a conversion element having an entrance surface and an exit surface. The radiation-emitting device further includes a dielectric mirror on the exit surface. The radiation-emitting device is configured such that first radiation emitted by the component during operation enters the conversion element via the entrance surface. The conversion element is configured for converting the first radiation into second electromagnetic radiation, which subsequently exits the conversion element via the exit surface. The dielectric mirror is transmissive to second radiation that is incident at angles of incidence in a predefined first angle range, and is reflective for second radiation that is incident at angles of incidence in a predefined second angle range.

The present invention discloses a fiber-optic ultrasonic endoscope with integrated lateral transmission and reception and a preparation method, which belongs to the field of ultrasonic endoscopic imaging. It comprises a double-clad optical fiber, an excitation film, a dielectric mirror, and a sensing film. By etching part of the inner cladding of the optical fiber into a concave spherical surface and coating it with an excitation film, the excitation light transmitted in the inner cladding is absorbed and focused ultrasonic waves transmitted laterally are excited. By etching part of the inner cladding and the core of the optical fiber and preparing it into a Fabry-Perot (F-P) cavity. When the ultrasonic signal transmitted laterally into the ultrasonic endoscope acts on the sensing film of the cavity, the effective refractive index of the sensing film and the F-P cavity length change, and the signal light in the core demodulates this change to complete the detection of ultrasonic waves. The present invention etches the inner cladding and coats it with an excitation film to achieve the excitation of laterally focused ultrasonic waves, etches an F-P cavity on the side of the optical fiber to achieve the lateral detection of ultrasonic waves, and thus forms a fiber-optic ultrasonic endoscope with integrated lateral transmission and reception.

A multiband dichroic metamirror includes a dielectric mirror and a metasurface. The dielectric mirror is configured to split incident light into a first waveband and a second waveband. The dielectric mirror is also configured to transmit the first waveband with a high transmission value and to reflect the second waveband with a high reflection value. The metasurface acts as a diffractive optical element that is configured to provide optical power for the second waveband.

[Problem] To provide a light-emitting element which does not adversely affect light-emitting characteristics while realizing a mesa-less structure. [Solution] In the present invention, an in-plane position of a semiconductor insulation region including an active layer is surrounded at a position separated by 0.5 μm or more outward from a light beam shape. Due to this configuration, a reactive current can be suppressed by narrowing the current to the shape and size as intended during ion implantation, and light absorption loss can be reduced. In addition, by covering the upper part of a step with a dielectric mirror, unintended positional deviation of the light beam can be prevented, and the reduction of the light absorption loss can be surely realized.

Described is a semiconductor chip (1) comprising a semiconductor body (2) having a first semiconductor layer (21) of a first conductivity type, a second semiconductor layer (22) of a second conductivity type different from the first conductivity type, and an active region (20) configured for emitting radiation, the active region (20) is arranged between the first semiconductor layer (21) and the second semiconductor layer (22), the first semiconductor layer (21) being electrically connected to a first contact structure (3) comprising at least one first contact finger (31); -at least one first contact finger (31) comprises a contact layer (35) and a current distribution layer (36); -the contact layer (35) is arranged on the first semiconductor layer (21); a dielectric mirror (4) is arranged in a region between the contact layer (35) and the current distribution layer (36); -the dielectric mirror (4) comprises at least one opening (41); and-the current distribution layer (36) extends through the at least one opening (41) and is directly adjacent to the contact layer (35).

An optical waveguide combiner with an output coupler comprising an array of embedded partially reflective dielectric mirrors that expand and couple a virtual (optionally, color) image generated by a laser display engine into a user EMB, wherein the dielectric mirrors are configured to have: a wavelength band for each laser emission band of the laser display engine, the wavelength band including wavelengths of light in the laser emission band and in a wavelength range in which the laser emission band is expected to drift; a reflectivity angular range exhibiting a first reflectivity; a transmittance angular range exhibiting a second reflectivity less than the first reflectivity; and a see-through angular transmittance range having high transmittance for natural light incident on a facet.

A magnetic resonance examination system has an examination region (11) and comprises a camera (21) and a non-metallic mirror (22), in particular within the examination region (11), through which a light path (23) is arranged between a portion of the examination region (11) and the camera (21). The camera can obtain image information from the portion even if a direct line of sight (28) is blocked. The non-metallic mirror is a dielectric mirror having a macroscopic grid base.

A tunable optical filter with a top-hat pass band shape. The proposed tunable optical filter is adapted to be installed over a top surface of a sensor, and comprises a set of at least three stacked dielectric mirrors parallelly adjacent to the plane of installation of the sensor, the at least three stacked dielectric mirrors comprise an upper mirror, an intermediate mirror and a lower mirror, wherein the set of at least three stacked mirrors is spaced within a variable distance to create at least two independent and adjacently equal volumetry cavities between the upper mirror and the intermediate mirror and between the intermediate mirror and the lower mirror.

An optical waveguide combiner having an output coupler comprising an array of embedded partially reflective dielectric mirrors expanding and coupling a virtual, optionally color, image generated by a laser display engine into a user EMB, wherein the dielectric mirrors are configured having a wavelength band for each lasing band of the laser display engine that includes wavelengths of light in the lasing band and in a range of wavelengths over which the lasing band is expected to drift, a reflectivity angular range exhibiting a first reflectivity, a transmittance angular range exhibiting a second reflectivity less than the first reflectivity, and a see-thru angular transmittance range having high transmittance for natural light incident on the facets.

A multiband dichroic metamirror (102) includes a dielectric mirror (300) and a metasurface (302). The dielectric mirror is configured to split incident light (110) into a first waveband (112) and a second waveband (114). The dielectric mirror is also configured to transmit the first waveband with a high transmission value and to reflect the second waveband with a high reflection value. The metasurface acts as a diffractive optical element that is configured to provide optical power for the second waveband.

The invention discloses an optical fiber ultrasonic endoscope of an array type detector and a preparation method of the optical fiber ultrasonic endoscope, and belongs to the field of ultrasonic endoscopic imaging. Comprising an optical fiber ultrasonic transmitter, an optical fiber ultrasonic detector and a clamp. The part, close to the end face, in the optical fiber ultrasonic transmitter is of a conical structure, and the conical structure is combined with an excitation film based on the photoacoustic effect to form a circular-ring-shaped ultrasonic excitation unit. In the optical fiber ultrasonic detector, a dielectric mirror and a sensing film are utilized to form a Fabry-Perot (F-P) interference cavity which is used for ultrasonic detection. The optical fiber ultrasonic transmitter penetrates through the hollow structure of the clamp, the array type optical fiber ultrasonic detector is fixed in the groove in the periphery of the clamp, and the optical fiber ultrasonic endoscope of the array type detector is formed. The optical fiber conical structure is combined with the excitation film to achieve annular ultrasonic excitation, the clamp is used for forming the array type optical fiber ultrasonic detector to achieve annular ultrasonic detection, the optical fiber ultrasonic endoscope of the array type detector is formed, and the optical fiber ultrasonic endoscope can be applied to rapid imaging of blood vessels or tiny cavities.

An optical waveguide combiner having an output coupler comprising an array of embedded partially reflective dielectric mirrors expanding and coupling a virtual, optionally color, image generated by a laser display engine into a user EMB, wherein the dielectric mirrors are configured having a wavelength band for each lasing band of the laser display engine that includes wavelengths of light in the lasing band and in a range of wavelengths over which the lasing band is expected to drift, a reflectivity angular range exhibiting a first reflectivity, a transmittance angular range exhibiting a second reflectivity less than the first reflectivity, and a see-thru angular transmittance range having high transmittance for natural light incident on the facets.

A hybrid semiconductor saturable absorber mirror (SESAM) output coupler for mode-locking and coupling an output of a laser system. The hybrid SESAM output coupler includes a curved base substrate. The hybrid SESAM output coupler further includes a dielectric mirror deposited onto the curved base substrate such that a curvature of the dielectric mirror matches a curvature of the curved base substrate. The hybrid SESAM output coupler further includes a semiconductor saturable absorber bonded to the dielectric mirror such that a curvature of the semiconductor saturable absorber matches the curvature of the curved base substrate. The hybrid SESAM output coupler may be configured to mode-lock one or more laser beams generated by the laser system and simultaneously optically couple each of the mode-locked laser beams into a mode-locked laser output.

A low-loss bidirectional HE11 coupler is disclosed with substantially higher directivity than prior HE11 THz couplers for overmoded waveguides operating in a frequency band centered about f0, where f0 is between 0.03 to 1.5 THz, with mid-band free-space wavelength λ0. The coupler comprises a main hollow-metal waveguide, aligned along the z axis, of inner radius r1, where r1 is greater than 2λ0, a first end of the main waveguide is identified as port-1 and its second end is identified as port-2. A first transverse lofted transition waveguide couples a port-3 of radius r3, where r3<r1, to a substantially elliptical opening of mean radius greater than r3 in one side of the main waveguide. A similar second tapered lofted transition waveguide, aligned on the same axis as the first lofted transition, identified as the y axis, couples a port-4 to a substantially elliptical opening in the opposite side of the main waveguide. A substantially elliptical dielectric mirror, centered with respect to the intersection of the axes of the main waveguide and the transverse coupling waveguides, rotated at approximately 45° with respect to the xy plane about the x axis for HE11 E-field polarization in the y direction, supported on its +x and −x sides, has major and minor transverse dimensions sufficient to intersect a substantial fraction of the cross-sectional area of the beam in the main waveguide. The mirror is further characterized as having thickness greater than λm / 10 and less than λm, where λm is the wavelength in the mirror at f0. The mirror dielectric is further characterized as typically having dielectric constant εm less than 3.7 and loss tangent less than 0.02. The coupler is further characterized as having portions of the inside surfaces of waveguides near their intersections coated with a microwave absorptive material that is characterized as having loss tangent greater than 0.01 and thickness greater than λa / 5, where λa is the wavelength in the absorptive coating at f0. Other inner surfaces of the waveguides may be bare metal, or corrugated, or laminate lined. A polarizer may be included at port-1 and / or port-2 to partially block s-polarization, here polarization with E field in the x direction. The polarizer may be formed by etching an array of narrow traces on copper-clad low-loss laminate of substrate thickness approximately λp / 2, where λp is the wavelength in the polarizer substrate at f0. The traces are further characterized as having periodicity approximately λ0 / 4, trace width less than λ0 / 12, and being aligned in the x direction.

This invention discloses an all-fiber ultrasonic endoscope and imaging system, belonging to the field of ultrasonic endoscopic imaging. It includes a guide fiber, a dielectric mirror, a sensing film, a heat-insulating film, an excitation film, a focusing acoustic reflector, and a lateral guide tube. Excitation laser light passes through the dielectric mirror, sensing film, and heat-insulating film, is absorbed by the excitation film, and generates ultrasonic waves, which are then transmitted laterally out of the endoscope through the lateral opening of the lateral guide tube. The Fabre-Perot cavity formed by the dielectric mirror causes multi-beam interference of the signal light, modulating the ultrasonic wave signal laterally transmitted into the endoscope onto the intensity of the interference light. This invention forms an integral structure by sequentially covering the end face of the guide fiber with the dielectric mirror, sensing film, heat-insulating film, and excitation film, and then fixing the guide fiber, focusing acoustic reflector, and lateral guide tube together. This reflects the ultrasonic waves propagating along the guide fiber to the side, allowing the fiber optic ultrasonic endoscope to simultaneously achieve lateral excitation and lateral detection of ultrasonic waves using a single optical fiber.

An optical waveguide combiner having an output coupler that includes an array of embedded partially reflective dielectric mirrors that expand and couple a virtual (optionally, color) image generated by a laser display engine into a user EMB, where the image is transmitted to the user EMB. The dielectric mirror is configured to have: a wavelength band for each laser emission band of the laser display engine, the wavelength band including wavelengths of light in the laser emission band and in a wavelength range in which the laser emission band is expected to drift; presenting a reflectivity angle range of the first reflectivity; exhibiting a transmittance angular range of a second reflectance less than the first reflectance; and a perspective angle transmittance range having a high transmittance for natural light incident on the facet.

A hybrid semiconductor saturable absorber mirror (SESAM) output coupler for mode-locking and coupling an output of a laser system. The hybrid SESAM output coupler includes a curved base substrate. The hybrid SESAM output coupler further includes a dielectric mirror deposited onto the curved base substrate such that a curvature of the dielectric mirror matches a curvature of the curved base substrate. The hybrid SESAM output coupler further includes a semiconductor saturable absorber bonded to the dielectric mirror such that a curvature of the semiconductor saturable absorber matches the curvature of the curved base substrate. The hybrid SESAM output coupler may be configured to mode-lock one or more laser beams generated by the laser system and simultaneously optically couple each of the mode-locked laser beams into a mode-locked laser output.

In at least one embodiment, a device (100) for emitting radiation comprises an optoelectronic device (1) for emitting a first electromagnetic radiation, a conversion element (2) having an incident surface (20) and an exit surface (21), and a dielectric mirror (3) located on the exit surface. The device is configured such that, during operation, the first radiation emitted by the device enters the conversion element through the incident surface. The conversion element is designed to convert the first radiation into a second electromagnetic radiation, which then exits the conversion element through the exit surface. The dielectric mirror is transmissive for the second radiation incident at an angle of incidence within a predefined first range and reflective for the second radiation incident at an angle of incidence within a predefined second range.

A low-loss bidirectional HE11 coupler is disclosed with substantially higher directivity than prior HE11 THz couplers for overmoded waveguides operating in a frequency band centered about ∫0, where ∫0 is between 0.03 to 1.5 THz, with mid-band free-space wavelength λ0, wherein the coupler comprises a dielectric mirror of substantially elliptical shape located such that its center approximately coincides with said intersection point.

The invention relates to a surface emitter having a first dielectric mirror structure, a second dielectric mirror structure and a light emitting structure arranged vertically between the first dielectric mirror structure and the second dielectric mirror structure, the light emitting structure being provided for emitting light. The first dielectric mirror structure and the second dielectric mirror structure are arranged to reflect light emitted by the light emitting structure. The light emitting structure has or is formed of at least one epitaxially grown layer. At least one of the first dielectric mirror structure and the second dielectric mirror structure does not have an epitaxially grown layer.