15 results about "Superluminescent diode" patented technology

The invention discloses a vector flow velocity measuring device and method based on a bidirectional scanning spectral domain optical coherence tomography technology. Comprising a super light-emitting diode light source, an optical fiber coupler, a polarization controller, an interferometer comprising a sample arm and a reference arm, and a collimating lens, the collimating lens, the grating, the focusing lens group and the linear array camera are sequentially connected through a light path; the linear array camera, the computer and the two-dimensional galvanometer are sequentially connected through a line; according to the method, the fixed bias vector velocity is introduced by utilizing the bidirectional scanning technology, the dynamic light scattering optical coherence tomography method and the Doppler optical coherence tomography method are combined, decoupling of each parameter of the vector flow velocity is efficiently and accurately realized, and a quantitative index is provided for vector flow velocity analysis. The vector flow velocity measuring device based on the bidirectional scanning spectral domain optical coherence tomography technology is simple in system setting and low in cost, the time resolution is improved by about 2.5 times, and the measuring time is shorter.

The invention belongs to the technical field of optical measurement, and relates to an MEMS fatigue evolution law observation device based on off-axis digital holographic microscopy, which comprises a red light super-radiation light-emitting diode light source, a wire grid type beam splitter, an objective lens and a CCD, and is characterized in that a linear polarizer, a half-wave plate and the wire grid type beam splitter are fixedly arranged on a light path emitted by a red light super-radiation light-emitting diode; a half-wave plate, a beam expanding lens group, a plano-convex lens, a beam splitter prism, an objective lens and a sample table are fixedly arranged on an object light path in sequence, a reflector is arranged on a vertical light path, and an optical delay line, the beam expanding lens group and the plano-convex lens are fixedly arranged on a reference light path; after the reference light passes through the reflector and the beam splitter prism, the reference light interferes with the object light reflected by the beam splitter prism on the CCD and is observed. According to the invention, the hologram of the MEMS device under high-frequency vibration can be acquired, and the surface topography of the MEMS device is obtained through computer rapid phase unwrapping, so that the purpose of observing fatigue evolution of the MEMS structure in real time is achieved.

The utility model discloses a super-radiation light-emitting diode light source driving circuit, and relates to the technical field of inertial navigation optical fiber gyroscope light source driving. The positive control end and the negative control end of the TEC temperature control module are respectively connected with the cold end and the hot end of the super-radiation light-emitting diode light source and are used for controlling the temperature of the super-radiation light-emitting diode light source to be within a set range, and the constant power module mainly provides stable and constant driving current for the super-radiation light-emitting diode light source; according to the utility model, stable and constant driving current can be provided for the super-radiation light-emitting diode light source, the super-radiation light-emitting diode light source TEC module can be controlled to carry out temperature compensation, and the optical power change caused by temperature change is reduced, so that the precision index of the optical fiber gyroscope is improved, the circuit structure is simple, the miniaturization design can be realized, and the cost is low. And the size and the weight of the optical fiber gyroscope are reduced.

The invention provides a light generating system (1000) comprising a first light generating arrangement (2100), a luminescent body (210), a reflective polarizer (500), and a control system (300); wherein the first light generating arrangement (2100) is configured to generate pump light (2101) having a controllable polarization, wherein the polarization is controllable between a first polarization and a second polarization; wherein the first light generating arrangement (2100) comprises a first solid state light source (10) selected from the group comprising a superluminescent diode and a laser diode; wherein the luminescent body (210) comprises a luminescent material (200); wherein the luminescent body (210) is configured to (a) transmit at least part of the pump light (2101) (comprising the first polarization and / or the second polarization) and (b) convert at least part of the pump light (2101) (comprising the first polarization and / or the second polarization) into luminescent material light (201); wherein the reflective polarizer (500) is configured downstream of the luminescent body (210); wherein the reflective polarizer (500) is transmissive for at least part of the luminescent material light (201); wherein the reflective polarizer (500) has a higher transmission for the pump light (2101) comprising the first polarization than for the pump light (2101) comprising the second polarization, wherein the reflective polarizer (500) has a lower reflectivity for the pump light (2101) comprising the first polarization than for the pump light (2101) comprising the second polarization; wherein the light generating system (1000) is configured to generate system light (1001); and wherein the control system (300) is configured to control spectral properties of the system light (1001) by controlling the polarization of the pump light (2101).

The application discloses a multi-period DBR super-radiation light-emitting diode structure with an ultra-wide spectrum width, wherein the upper surface of a P face electrode is divided into four areas, which are a light-emitting end ridge, an active multi-mode interference device, a plurality of non-light-emitting end ridges, a plurality of ridges with different period DBRs and an optical absorption area. The application effectively clamps the gain center wavelength through the multi-DBR structure, so that the center wavelength of the light emitted by the device is different, and then the problem that the spectrum is narrowed due to the fact that the photons close to the center gain wavelength are amplified more and the photons far away from the center gain wavelength are amplified less when the current is increased is effectively suppressed, so that the spectrum width of the device is effectively widened. The tilted ridge structure is adopted, the wide-spectrum antireflection film with a reflectivity less than 2% is deposited on the front and rear cavity surfaces, and the optical absorption area is formed on the non-light-emitting end of the device, so that the F-P oscillation is effectively suppressed through the above three methods, and the emitted light is ensured to be super-radiation light.

This invention provides a broadband high-power superluminescent diode based on tunnel junction cascade, comprising an epitaxial structure and matched n-electrodes and p-electrodes. The epitaxial structure includes an n-type confinement layer, a p-type confinement layer, x light-emitting structures, and (x-1) tunnel junctions. The x light-emitting structures and (x-1) tunnel junctions are disposed between the n-type and p-type confinement layers along the epitaxial growth direction. Each tunnel junction is disposed between two adjacent light-emitting structures, and the two adjacent light-emitting structures are electrically cascaded via the tunnel junctions. The n-type and p-type confinement layers form a unique pair of confinement layer structures, and the x light-emitting structures operate together within the same pair of confinement layer structures. By setting a unique pair of confinement layer structures, this invention eliminates the multi-waveguide characteristics of the longitudinal refractive index distribution, thereby suppressing longitudinal multimode and near-field multi-peak phenomena, significantly improving the coupling efficiency and beam quality of the device, and simultaneously achieving high power and broadband output.

A module accommodates multiple superluminescent light emitting diodes, SLEDs, 12r, 12g and 12b. The SLEDs are arranged in an enclosure and output respective light beams to propagate into free space within the enclosure. The individual light beams from the SLED sources are combined into a single beam path within the enclosure using beam combiners 40r-g, 40rg-b. Each beam combiner is realized as a planar optical element, the back side of which is arranged to receive a SLED beam and route it through the optical element to the front side where it is combined with another SLED beam that is incident on and reflected by the front side. The free-space propagating combined beam is output from the module via an optical fiber 42 (or through a window).

This invention proposes a superluminescent light-emitting diode (SLD), belonging to the technical field of light-emitting diodes, to solve the technical problem of SLDs being sensitive to cavity surface reflection and prone to spectral ripple. The SLD of this invention includes a substrate, on the front side of which an epitaxial material is grown. A waveguide structure is formed on the upper surface of the epitaxial material. The waveguide structure includes a short curved waveguide absorption region, a straight waveguide emitting region, and a long curved waveguide absorption region connected end-to-end. The length of the long curved waveguide absorption region is greater than the length of the short curved waveguide absorption region. The long curved waveguide absorption region is located at one end of the front cavity surface, and the short curved waveguide absorption region is located at one end of the rear cavity surface. The front face of the long curved waveguide absorption region is the light-emitting surface. Electrodes are provided on the straight waveguide emitting region to form a beam-emitting region. The SLD prepared by this invention exhibits high power, wide spectrum, and low spectral ripple output performance.

A monolithic edge-emitting semiconductor diode array chip (100) comprises a one-dimensional array (70) of diode emitters (50), such as laser diodes, superluminescent diodes or semiconductor optical amplifiers. Semiconductor layers are arranged on a conductive substrate (1) and include active region layers (14) arranged between upper and lower cladding layers (12, 16) and separation layers (4, 5) arranged between the conductive substrate (1) and the lower cladding layer (16). The diode emitters (50) are formed by respective ridges (9) that are separated by trenches (25) which are sufficiently deep to penetrate into the separation layers (4, 5). Each diode (50) has its own upper and lower contacts (22, 24) that allow each diode (50) to be independently drivable with a current source driver circuit connected to push a modulated push current through its associated diode and / or a current sink connected to extract a modulated pull current through its associated diode.

The application relates to a gallium arsenide-based super-radiation light-emitting diode and a preparation method thereof, and mainly solves the technical problem that when a cavity surface is coated with an anti-reflection film in combination with a non-pumping absorption zone and a curved waveguide, an inclined waveguide, a tapered waveguide and other technologies to suppress light oscillation in a resonance cavity, resonance gain still exists, which has a negative impact on the power and other performances of the gallium arsenide-based super-radiation light-emitting diode. The gallium arsenide-based super-radiation light-emitting diode comprises a substrate layer, an epitaxial layer arranged on the substrate layer, and a metal layer arranged on the epitaxial layer; the metal layer is in a straight line type structure; the light-out surface and the back-light surface of the substrate layer and the epitaxial layer are arranged in parallel to each other, and the light-out surface and the back-light surface are both arranged in an inclined manner along the direction from the back-light surface to the light-out surface; an obtuse angle formed by the light-out surface and the back-light surface with a horizontal direction is defined as an inclination angle alpha, and the value of alpha is 100-110 degrees; the light-out surface is coated with an AR reflection film, and the reflectivity is 0.5-50%; and the back-light surface is coated with an HR reflection film, and the reflectivity is greater than 90%.

The invention provides a light generating system (1000) comprising a first light generating device (110), a luminescent body (1200), a thermally conductive element (500), and an axicon-like optical element (400); wherein: (A) the first light generating device (110) is configured to generate first device light (111); the first light generating device (110) comprises one or more of a superluminescent diode and a solid state laser; (B) the luminescent body (1200) comprises a luminescent material (200) configured to convert at least part of the first device light (111) into luminescent material light (201); the luminescent body (1200) has an annular shape; (C) the thermally conductive element (500) (a) is configured in thermal contact with at least part of the luminescent body (1200), and (b) is reflective for one or more of the first device light (111) and the luminescent material light (201); (D) the axicon-like optical element (400) comprises a first part (410) and a second part (420), and has an optical element length (L); the first part (410) has a conical shape, a first length (L1), and comprises a first end window (411); the second part (420) has a cylindrical shape, a second length (L2), and comprises a second end window (422); wherein 0.7≤L2 / L<1; and (E) the axicon-like optical element (400) is configured to: (a) receive at least part of the first device light (111) via the first part (410) and provide an annular beam of first device light (111) via the second part (420) to the luminescent body (1200), and (b) collect at least part of the luminescent material light (201) via the second part (420) and provide a beam of luminescent material light (201) via the first part (410).

The invention provides a light generating system (1000) comprising a first solid state light source (10), a first luminescent converter (2100), a second luminescent converter (2200), and a first thermally conductive body (3100); wherein: (A) the first luminescent converter (2100) and the second luminescent converter (2200) are configured physically separated by a shortest distance d1, thereby defining an inter-converter cavity (1200); wherein 0.3 mm ≤ d1 ≤ 3 mm; (B) the first luminescent converter (2100) comprises a first converter first major face (2110) and a first converter second major face (2120) opposite the first converter first major face (2110); wherein the first luminescent converter (2100) is configured in thermal contact with the first thermally conductive body (3100) at the first converter second major face (2120); (C) the first solid state light source (10) comprises a laser light source and / or a superluminescent diode, wherein the first solid state light source (10) is configured to generate first light source light (11); wherein the first solid state light source (10) is configured to irradiate the first converter first major face (2110) via a first optical path (31) between the first solid state light source (10) and the first luminescent converter (2100); wherein the first optical path (31) intersects at least part of the inter-converter cavity (1200) and passes by the second luminescent converter (2200); wherein the first luminescent converter (2100) is configured in the reflective mode; wherein the first luminescent converter (2100) is configured to (i) convert part of the first light source light (11) received by the first luminescent converter (2100) into first luminescent converter light (2101), and (ii) reflect at least part of the first light source light (11) received by the first luminescent converter (2100) to the second luminescent converter (2200) as reflected first light source light (111); (D) the second luminescent converter (2200) is configured to (a) convert at least part of the reflected first light source light (111) received by the second luminescent converter (2200) into second luminescent converter light (2201), and (b) transmit at least part of the first luminescent converter light (2101) received by the second luminescent converter (2200); wherein the second luminescent converter (2200) is configured in the transmissive mode; and (E) the light generating system (1000) is configured to generate system light (1001) comprising (a) first luminescent converter light (2101) transmitted by the second luminescent converter (2200) and (b) second luminescent converter light (2201).

The invention provides a light generating system (1000), configured to generate system light (1001), wherein the light generating system (1000) comprises a light source (10), a first luminescent material (210), and a control system (300), wherein: —the light source (10) is configured to generate light source light (11) having a tunable spectral power distribution within a first wavelength range (Λx1); wherein the light source (10) comprises a superluminescent diode; —the first luminescent material (210) is configured to convert at least part of the light source light (11) into first luminescent material light (211) having one or more wavelengths in a first luminescent material light wavelength range (Λm1); —the first luminescent material (210) is configured such that in an operational mode the system light (1001) comprises the first luminescent material light (211); —a spectral power distribution of the system light (1001) is controllable in dependence of the spectral power distribution of the light source light (11); and —the control system (300) is configured to control the spectral power distribution of the light source light (11).

The invention provides a light generating system (1000) comprising a first light generating device (110), a second light generating device (120), a luminescent material (200), a first optical element (410), and a control system (300), wherein: the first light generating device (110) is configured to generate blue first device light (111), wherein the first light generating device (110) comprises one or more of a laser diode and a superluminescent diode; wherein the second light generating device (120) is configured to generate red second device light (121), wherein the second light generating device (120) comprises one or more of a laser diode and a superluminescent diode; the luminescent material (200) is configured downstream of the first light generating device (110), wherein the luminescent material (200) is configured to convert at least part of the first device light (111) into luminescent material light (201) having one or more wavelengths in the green-yellow wavelength range; the first optical element (410) is configured in a light receiving relationship with the first light generating device (110) and the luminescent material (200); wherein (i) the first optical element (410) has a controllable wavelength dependent transmission in the blue wavelength range, and / or (ii) the first optical element (410) has a controllable wavelength dependent reflection in the blue wavelength range; the light generating system (1000) is configured to generate system light (1001) comprising one or more of the first device light (111), the second device light (121), and the luminescent material light (201); and the control system (300) is configured to control a spectral power distribution of the system light (1001) by controlling the first optical element (410), wherein the control system (300) is configured to control the correlated color temperature of the system light (1001) at a value selected from the range of 1800-6500 K, wherein the correlated color temperature of the system light (1001) is controllable over a CCT control range of at least 250 K within the range of 1800-6500 K.

The invention provides a light generating system (1000) comprising a blueish light generating device (120), an diffuser light generating device (130), optics (500), a diffuser assembly (700), and a light exit (1090); wherein: (A) the blueish light generating device (120) is configured to provide blueish device light (121) having a blueish centroid wavelength (λc2) selected from the wavelength range of 430-490 nm, and comprises a blueish solid state light source (20); (B) the diffuser light generating device (130) is configured to provide diffuser device light (131) having a diffuser centroid wavelength (λc3) selected from the wavelength range of 470-780 nm, and comprises a diffuser solid state light source (30); wherein |λc3-λc2| ≥ 10 nm; (C) the blueish and diffuser solid state light sources (20,30) are selected from the group comprising laser diodes, superluminescent diodes, and stacked multi-junction light-emitting diodes; (D) the optics (500) comprise a diffuser redirection optical element (530), configured in an optical path between (i) the blueish light generating device (120) and (ii) the diffuser light generating device (130) and the diffuser assembly (700); wherein the diffuser redirection optical element (530) is configured to direct (i) blueish device light (121) and (ii) diffuser device light (131) into an optical path to the diffuser assembly (700); (E) the diffuser assembly (700) comprises a diffuser (710) configured to diffuse at least part of the blueish device light (121) into diffused blueish device light (721), and at least part of the diffuser device light (131) into diffused diffuser device light (731); (F) the diffuser redirection optical element (530) is further configured to direct (i) the diffused blueish device light (721), and (ii) the diffused diffuser device light (731) into an optical path to the light exit (1090); wherein (i) an optical axis of the blueish device light (121) upstream of the diffuser redirection optical element (530), and (ii) an optical axis of the diffused blueish device light (721) and the diffused diffuser device light (731) downstream of the diffuser redirection optical element (530) are co-axial; wherein the light generating system (1000) is configured such, that the blueish device light (121) and the diffuser device light (131) are incident on the diffuser redirection optical element (530) from orthogonal directions; and (G) the light generating system (1000) is configured to generate system light (1001), wherein in a first operational mode the system light (1001) comprises at least part of (i) the diffused blueish device light (721) and (ii) the diffused diffuser device light (731).