179 results about "Absorption loss" patented technology

A symmetric touch screen switch system in which both the touch side and panelside transparent electrodes are comprised of carbon nanotube thin films is provided. The fabrication of various carbon nanotube enabled components and the assembly of a working prototype touch switch using those components is described. Various embodiments provide for a larger range of resistance and optical transparency for the both the electrodes, higher flexibility due to the excellent mechanical properties of carbon nanotubes. Certain embodiments of the symmetric, CNT-CNT touch switch achieve excellent optical transparency (<3% absorption loss due to CNT films) and a robust touch switching characteristics in an electrical test.

A light source comprising sidelight type backlight light guide plate (L), wherein a transmittance angle dependent layer (T1) which transmits normally incident light and reflects obliquely incident light is disposed on one surface of the sidelight type backlight light guide plate (L), and a reflection plate (R) having a repetitive slope structure is disposed on the other surface of the sidelight type backlight light guide plate (L). The invention light source is less in absorption loss due to repetition of light reflection and the like.

An optoelectronic device includes a planar active element, a vertical waveguide surrounding the active element in the vertical direction, and a lateral waveguide comprising at least one active section and at least one filter section following each other in the longitudinal direction. At least part of the active element within the active section generates optical gain in response to above-threshold pumping. The broad lateral waveguide in the active section can localize multiple lateral optical modes. In the filter section, no lateral confinement is provided for the lateral optical modes. The device further comprises means to ensure low absorption loss in the filter section and, therefore, ensure high efficiency. In one embodiment low absorption loss is achieved by pumping of at least part of the active element within the filter section. In another embodiment, the active element has small overlap with the vertical optical modes.

The invention relates to a two-dimensional stratified material based practical saturable absorber and a production method thereof, and belongs to the field of saturable absorbers of lasers. The two-dimensional stratified material based practical saturable absorber comprises a substrate, a high-reflection layer, a saturable absorption layer and a functional layer. One end face of the functional layer is connected with the saturable absorption layer, one end face of the saturable absorption layer is connected with the high-reflection layer, and one end face of the high-reflection layer is connected with the substrate. By the two-dimensional stratified material based practical saturable absorber and the production method thereof, application of the lasers, such as Q-switching, mode locking and optical signal processing, is realized. By the high-reflection layer formed by composite materials, absorption loss is reduced and reflection rate is increased, and optimal material combinations can be found in terms of different wave lengths.

The invention relates to a single-layer planar chirality metal structure circular polarizer which belongs to electromagnetic wave devices, and belongs to the technical field of electromagnetic waves of optics, terahertz, microwaves and other frequency bands. The circular polarizer is formed by a single-layer metal structure with planar chirality, and the functions of the circular polarizer are achieved on the basis of a one-way mode switching principle. The circular polarizer is easy to machine and integrate, thin, small in size and compact in structure, has high efficiency of screening on left-hand and right-hand circular polarization electromagnetic waves, and is low in device absorption loss and high in transmittance. By changing the design of the size and the structural design of the circular polarizer, the circular polarization function can be achieved at different electromagnetic frequency bands such as optics, terahertz and microwaves. The circular polarizer can achieve low-cost and large-area manufacturing, and has important application in the fields of optical microscopy, three-dimensional display, laser technologies, communication, radar and the like.

The invention discloses an electromagnetic shielding composite material. Electromagnetic wave absorption layers and electromagnetic wave reflection layers are alternately overlapped to form electromagnetic shielding function bodies; the electromagnetic wave absorption layers are formed by compositing matrix resin, fiber carriers and electromagnetic absorption function bodies; the electromagnetic wave absorption layers are formed by compositing matrix resin and electromagnetic gradient reflection function bodies; in the overlapped electromagnetic wave reflection layers, the mass percentage compositions of short cut carbon fibers increase in gradient along the incident directions of the electromagnetic waves. According to the electromagnetic shielding composite material of the invention, the incident electromagnetic waves generate multi-reflection; the propagation paths of the electromagnetic waves in the material are increased; increase of the multi-reflection loss and absorption loss enables the shielding efficiency of the material to be increased; in adoption of the reflection layers of gradient structure, the electromagnetic waves will not escape away from the shielding material rapidly for reflection; more electromagnetic waves can enter the next shielding unit; therefore, the shielding efficiency of the material is further improved.

The embodiment of the invention provides a quantum dot light-emitting component, a backlight module and a display device, relating to the field of photoelectric devices. On the premise of not increasing the volume of the component, the absorption loss in a light transmission process is reduced; and the light output efficiency of the quantum dot light-emitting component is increased. The quantum dot light-emitting component comprises a support frame, an excitation light source, a first reflecting layer and a quantum dot layer, wherein the support frame is shaped as a groove; the excitation light source is arranged at the bottom of the groove in the support frame and used for emitting excitation light; the first reflecting layer is arranged on the side wall of the support frame and used for reflecting the excitation light emitted on the side wall of the support frame by the excitation light source; the quantum dot layer is arranged at the opening of the groove of the support frame and emits light by being excited by the excitation light; and the excitation light source, the quantum dot layer and the support frame are packaged together so as to form an integral closed structure. The embodiment of the invention is used for manufacturing the quantum dot light-emitting component.

The invention provides ultraviolet (UV) light-emitting diodes (LEDs). The UV LEDs can comprise abase layer including p-type SiC or p-type AlGaN, an active layer, and an n-AlGaN layer, wherein the active layer is disposed between the base layer and the n-AlGaN layer. In some embodiments, the absorption losses in p-SiC can be decreased or prevented by incorporating a conductive AlGaN Distributed Bragg Reflector (DBR) between the p-type SiC layer and the active layer. In some embodiments, the n-AlGaN layer can be textured to increase the extraction efficiency (EE). In some embodiments, the external quantum efficiency of the LEDs can be 20-30% or more.

The simultaneous measuring process of several optical parameters of planar waveguide in planar waveguide technology field includes the following steps: constituting the measuring apparatus, measuring the optical path and echo loss corresponding to the fixed reflector before the measured waveguide insertion, installing the measured waveguide; measuring the optical path and echo loss corresponding to various interfaces after the measured waveguide insertion, calculating the refractive index and thickness of the measured sample, and calculating the insertion loss, absorption loss, reflectivity and diffuse reflection factor of the planar waveguide based on the measured optical path and echo loss of the direct interface reflections and multiple inner reflections between interfaces as well as the multiple reflection relation. The present invention has high measurement precision, simple calculation and other advantages.

An absorbing solution according to the present invention is an absorbing solution that absorbs CO₂ or H₂S in gas or both of CO₂ and H₂S. The absorbing solution is formed by adding desirably 1 to 20 weight percent of tertiary monoamine to a secondary-amine composite absorbent such as a mixture of secondary monoamine and secondary diamine. Consequently, it is possible to control degradation in absorbing solution amine due to oxygen or the like in gas. As a result, it is possible to realize a reduction in an absorption loss, prevention of malfunction, and a reduction in cost. This absorbing solution is suitably used in an apparatus for removing CO₂ or H₂S or both of CO₂ and H₂S.

The present invention provides an anti-reflection film which weakens color in reflection light and prevents an occurrence of color unevenness. The anti-reflection film has a value in the range of 0.5-1.5% as an average luminous reflectance, a value in the range of 0.2-0.9% as a difference between the maximum and the minimum of spectral reflectance in the visible light region, a value in the range of 0.5-3.0% as an absorption loss in average luminous transmittance, a value in the range of 0.5-4.0% as a difference between the maximum and the minimum of absorption losses in light transmittance at all wavelengths within the visible light region, and a magnitude relation of Q₄₅₀>Q₅₅₀>Q₆₅₀, where Q₄₅₀, Q₅₅₀ and Q₆₅₀ is an absorption loss in light transmittance of said anti-reflection film at wavelengths of 450 nm, 550 nm 650 nm.

The invention relates to a daylight illumination apparatus. A daylight collector (3) collects daylight (4), which is guided to an illumination location to be illuminated along an optical path by a light guide (5), wherein the daylight is absorbed by the light guide. A photoluminescent material (6, 8) is arranged within the optical path and emits photoluminescent light that compensates for the absorption of the daylight by the light guide. Absorption losses of the daylight can therefore effectively be compensated, without necessarily needing, for example, an active compensation light source. This allows providing compensated day-light illumination in a technically relatively simple way.

A method of calibration-free scanned-wavelength modulation spectroscopy (WMS) absorption sensing is provided by obtaining absorption lineshape measurements of a gas sample on a sensor using 1/-normalized WMS-2/j where an injection current to an injection current-tunable diode laser (TDL) is modulated at a frequency ̂ where a wavelength modulation and an intensity modulation of the TDL are simultaneously generated, extracting using a numerical lock-in program and a low-pass filter appropriate band-width WMS-<</ (n=1, 2, . . . ) signals, where the WMS-<</ signals are harmonics of the f, determining a physical property of the gas sample according to ratios of the WMS-<</ signals, determining the zero-absorption background using scanned-wavelength WMS, and determining non-absorption losses using at least two the harmonics, where a need for a non-absorption baseline measurement is removed from measurements in environments where collision broadening has blended transition linewidths, where calibration free WMS measurements without knowledge of the transition linewidth is enabled.

The present invention provides a crystalline silicon solar cell and a preparation method thereof. The crystalline silicon solar cell comprises: an N-type silicon substrate; a tunneling oxide layer formed on the back surface of the N-type silicon substrate; and a polysilicon layer formed on the tunneling oxide layer, wherein the polysilicon layer comprises alternatively distributed N+ polysilicon areas and P+ polysilicon areas, and a space is arranged between each neighboring N+ polysilicon area and P+ polysilicon area. The tunneling oxide layer, the N+ polysilicon areas and the P+ polysiliconareas form a passivation contact structure on the back surface of the N-type silicon substrate. According to the crystalline silicon solar cell and the preparation method thereof, the recombination rate of the back surface of a battery is effectively reduced, and the open circuit voltage of the battery is improved. Compared with the conventional back knot and back contact solar cells, the doping process of the front surface is saved, the battery preparation process is simplified, the absorption loss of light is reduced, and thus the solar cell can facilitate the improvement of battery performance and the reduction of cost.

The invention relates to a method for measuring transmission loss of an optical element. The method comprises the following steps that: continuous laser is reshaped through a mode matching lens, and then enters an optical resonant cavity along an optical axis; two iris diaphragms of which the standoff distance is slightly larger than the thickness of the optical element to be measured are placed into the optical resonant cavity, wherein the clear aperture is less than the aperture of the optical element to be measured; after a shutoff laser beam is triggered, an output signal of the optical resonant cavity is recorded to fit fading time tau 0; the optical element to be measured is placed between the two iris diaphragms in the optical resonant cavity; the optical element to be measured is adjusted to make the surface of the optical element vertical to the optical axis; the output signal of the optical resonant cavity is recorded to fit fading time tau 1; the angle of the optical element to be measured is adjusted to make directly reflected light on the surface escape from the optical resonant cavity; the output signal of the optical resonant cavity is recorded to fit fading time tau 2; the absorption loss A of the optical element to be measured can be acquired by using the tau 0 and the tau 1; and the surface antireflective film residual reflectance R of the optical element to be measured is acquired by using the tau 1 and the tau 2. The method has the advantages of simple structure, high measurement precision, low system cost and the like.

The invention provides an aluminum-free active region 808nm high-power quantum-well laser with asymmetric structure. From the bottom to the top, the structure of the laser sequentially comprises a substrate, a buffer layer, an N-type lower limiting layer, a lower waveguide layer, a quantum-well layer, an upper waveguide layer, a potential barrier limiting layer, a P-type upper limiting layer, a transition layer and an ohmic contact layer, wherein, the upper waveguide layer and the lower waveguide layer are made of aluminum-free material Indium gallium phosphide, the quantum-well layer made of gallium indium arsenide phosphide material, the waveguide layer and the quantum-well layer form the aluminum-free active region, and one layer potential barrier limiting layer which is made of P-type aluminum gallium indium phosphide material and 50nm-150nm thick and has a band gap wider than that of the upper limiting layer is arranged between the upper limiting layer and the upper waveguide layer. The laser of the invention can increase the optical limiting factor of the P-type material region, reduce the optical leakage towards the P-type material region, reduce optical absorption loss of a current carrier at the highly doped area, and improve the work efficiency of the laser; the structure of the invention also improves the limiting effect of the active region on the carrier, reduce the leakage of the carrier and is favorable to the decrease of the threshold current.

The invention relates to the fields of illumination, display and optical communication, in particular to a vertical-structure near ultraviolet light-emitting diode and a preparation method thereof. The vertical-structure near ultraviolet light-emitting diode comprises a conductive substrate, a metal reflective layer, a nitride epitaxial layer, an N-type electrode and a P-type electrode, wherein the conductive substrate has a first surface and a second surface opposite to the first surface; the metal reflective layer is arranged on the first surface; the nitride epitaxial layer is arranged on the surface of the metal reflective layer, the nitride epitaxial layer comprises a P-type GaN layer, a quantum well layer, a preparation layer and an N-type AlGaN layer which are sequentially stacked in a direction perpendicular to the conductive substrate, and the thickness of the nitride epitaxial layer is less than a wavelength of near-ultraviolet light; the N-type electrode is arranged on the surface of the N-type AlGaN layer; and the P-type electrode is arranged on the second surface. The vertical-structure near ultraviolet light-emitting diode reduces the absorption loss inside the light-emitting diode and greatly improves the light-emitting efficiency.

The invention modifies circuit structure with no absorption loss in existed soft switching as follows. In BOOST boosted circuit, a branch circuit composed of cascaded diode D2, D3 and D4 is connected to two ends of freewheeling diode D1 in BOOST circuit in parallel. One end of resonance branch circuit composed of capacitance C2 and inductance L2 is connected to positive end of diode D1, and the other end of the resonance branch circuit is connected to between diode D3 and D4. One end of capacitance C3 is connected between diode D2 and D3, and the other end is connected to end of cathode of switching tube. If needed, circuit with no absorption loss of positive/negative excited convertor can be added to modified circuit.

The present application describes a system and method for converting randomly polarized light into linearly polarized light without absorption loss to improve the brightness of a liquid crystal display system. According one embodiment, the liquid crystal display system includes an optical converter module configured to convert the randomly polarized light into linearly polarized light. The optical converter module is configured to convert the polarization of a first polarized component of the randomly polarized light to be substantially similar to a second polarized component. The optical converter module transmits the first and second polarized components having substantially similar polarization.

The invention provides a comprehensive testing method of the optical performance of a deep ultraviolet optical element. According to the comprehensive testing method, the absorption loss absolute value of the deep ultraviolet optical element is measured based on the laser heat measurement technology; the fluorescence spectrum of the deep ultraviolet optical element is measured based on the laser-induced fluorescence spectrum technology when the deep ultraviolet optical element is irradiated by a deep ultraviolet laser; the defect level, the contents of doping components and the content of impurities of a material of the deep ultraviolet optical element are measured based on the Raman spectra technology. Through measurement of the absorption loss feature, the fluorescence spectrum feature and the Raman spectral feature of the deep ultraviolet optical element at the deep ultraviolet laser wavelength, the comprehensive optical performance of the deep ultraviolet optical element is estimated. By measuring the real-time change of the absorption loss, the fluorescence spectrum and the Raman spectrum of the deep ultraviolet optical element in the process of deep ultraviolet laser irradiation, the stability of the performance of the deep ultraviolet optical element is monitored. By the adoption of the same device, the optical feature parameters of the deep ultraviolet optical element are measured and the change of the optical feature of the deep ultraviolet optical element in the process of deep ultraviolet laser irradiation is monitored in real time.

The invention belongs to the technical field of optoelectronic materials, and particularly relates to a terahertz polarization maintaining optical fiber and a manufacturing method of the terahertz polarization maintaining optical fiber. The terahertz polarization maintaining optical fiber is a medium/metal hollow optical fiber and is obtained by coating a metal film and a medium film on the inner wall of a base tube, the cross section of the terahertz polarization maintaining optical fiber is oval-shaped, and aperture size is determined according to the double refraction of a target and transmission loss, the ratio of an oval-shaped long shaft to an oval-shaped short shaft being 2:4, and the relationship between the double refraction and a normalization aperture. The optical fiber with the structure can obtain the double refraction in a 3*10<-2> mode and 2.4dB/m of absorption loss at 1THz (300mum).

The application provides a display panel and a control method thereof, and a display device. The display panel comprises a first substrate, a refractive layer and a second substrate which are sequentially stacked, wherein the second substrate comprises a grating layer for outputting part of incident light of the grating layer to the display panel at a preset angle. The refractive index of the refractive layer is adjustable, wherein the refractive index of the refractive layer is smaller than the first refractive index of the first substrate in a dark state, so that the incident light is totally reflected in the first substrate; the refractive index of the refractive layer is greater than or equal to the first refractive index in a bright state, so that the incident light is output to the display panel; the refractive index of the refractive layer changes to adjust the light-emitting efficiency of the display panel, thereby realizing the gray scale display, that is, the gray scale display of the display panel can be carried out without a polarizing plate, and the factors affecting the transmittance and the transparency are only the absorption loss of the first substrate, the refractive layer and the second substrate. Therefore, the display panel provided by the application can improve the transmittance and transparency of a display product.