34results about How to "Increase absorption length" patented technology

The invention discloses a silicon nanowire grating resonant enhanced photoelectric detector, which comprises a silicon substrate, a silicon oxide layer, an I-shaped mesa structure, a protective layer, a metal gate electrode and two photocurrent output metal electrodes, wherein the silicon oxide layer is manufactured on the silicon substrate; the I-shaped mesa structure is manufactured on the silicon oxide layer, two ends of the I-shaped mesa structure are provided with a P-type electrode and an N-type electrode, and a silicon nanowire grating resonant cavity structure is connected between the P-type electrode and the N-type electrode; the protective layer is manufactured on the surface and side faces of the I-shaped mesa structure, and electrode windows are formed on the P-type electrode and the N-type electrode at two ends of the I-shaped mesa structure; the metal gate electrode is manufactured on the protective layer of the silicon nanowire grating resonant cavity structure and is close to one side of the N-type electrode; and the two photocurrent output metal electrodes are manufactured in the electrode windows of the protective layer on the P-type electrode and the N-type electrode of the I-shaped mesa structure.

The present invention discloses an end pumped order variable gradient adulterate composite lath laser amplifier, which comprises a laser gain medium, seed source, pumping source, coupling lens duct, lath cooling heat sink and indium transition layer, characterized in that the laser gain medium is N-order order variable gradient adulterate composite ceramic lath and is composed by 2N+3 segments that is sub-lath in middle section that has highest luminous ion concentration decreases, each N segment sub-lath with luminous ion concentration decreases gradually towards two ends, and sub-lath with zero adulterate on two ends, wherein N is positive integer. The present invention can improve temperature distribution homogeneity and decrease biggest thermal stress, and further realize laser output of high average power and high beam quality.

The invention provides a laser head device for a solid laser, which comprises lath-shaped laser medium, a pump source, and two opposite glass plates arranged at the outer side of the large surface of the lath-shaped laser medium. Pump light produced by the pump source shines the lath-shaped laser medium through the wind glass plates so as to ensure that the laser medium is stimulated to be radiated and produces laser; and the pump light obliquely enters and penetrates through the lath-shaped laser medium through a transmission zone at the outer side of at least one wind glass plate, is reflected through a reflection zone of the other window glass plate, and then penetrates through the lath-shaped laser medium again, so that the pump light is reflected between the two window glass plates and penetrates through the lath-shaped laser medium at least two times. As the pump light penetrates through the lath-shaped laser medium repeatedly along a Z-shaped light path, the absorption length is optimally designed, and the absorption efficiency to the pump light by the laser medium is improved.

The invention relates to a laminated film photovoltaic device with a plasmon structure and application thereof. The laminated film photovoltaic device with the plasmon structure comprises a metal electrode, a low band gap photoelectric conversion layer, a nanometer metal particle plasmon structural layer, a high band gap photoelectric conversion layer and a transparent conductive film, wherein the low band gap photoelectric conversion layer is positioned on the metal electrode; the nanometer metal particle plasmon structural layer is positioned on the low band gap photoelectric conversion layer, and comprises nanometer metal particles of which the particle size is between 100 and 200nm; the high band gap photoelectric conversion layer is positioned on the nanometer metal particle plasmon structural layer; and the transparent conductive film is positioned on the high band gap photoelectric conversion layer. The laminated film photovoltaic device with the plasmon structure can reduce the overall thickness of the device and improve the generation rate of light current.

The invention discloses a CO2 gas concentration monitoring device and method with the automatic temperature and air pressure compensation. The CO2 gas concentration can be accurately detected in a relatively wide temperature range and a relatively wide air pressure range, and the device and the method are applied to monitoring the CO2 gas concentration in a low-temperature low-pressure environment. The CO2 gas concentration is monitored by adopting a dual-wavelength infrared monitoring principle and a suction structure, and the device has the advantages of adaptation to a low-temperature low-pressure environment, high precision, high reliability and the like. The interference caused by factors such as light source instability is eliminated by adopting a dual-channel infrared detector, the absorption length of infrared light is increased by adopting a reflector, the environment suitability of the device is enhanced by adopting a heating element and a heat preservation material, the receiving light intensity is enhanced and the automatic temperature and air pressure compensation and correction is performed by adopting a conical optical collector, and the CO2 gas monitoring precision is effectively improved.

The invention discloses a solar cell with a phase grating nanostructure. A transmission type phase grating is manufactured on the surface of the solar cell, wherein the phase grating is composed of a series of etching grooves, the depth of the etching grooves is calculated through the formula h=lambda/[2(n-1)], pi represents the phase difference generated when incident light is spread to the lower surface from the upper surface of the grating, lambda represents the central wavelength of the incident light, and n represents the refractive index of materials of the phase grating on the surface of the solar cell. The width and interval of the etching grooves are designed according to the Huygens-Fresnel principle and calculated through the Fresnel wave band method. By means of the integration of the phase grating and the solar cell, a high-performance, small-size and high-efficiency photovoltaic system is obtained. The reflectivity of the surface of the solar cell can be effectively decreased. The absorption length of photons in PN junction areas of the solar cell is effectively increased. The light field density of the incident light in the PN junction areas of the solar cell is effectively increased; the effective photon absorption of the PN junction areas of the solar cell is effectively increased.

The invention discloses a solar battery with a Fresnel lens nano structure. A Fresnel lens is manufactured on the surface of the solar battery; the Fresnel lens consists of a series of concentric annulus etching grooves; the depth of each etching groove is calculated according to the equation as shown in the specification, so that the phase difference of incident light transmitted to the lower surface from the upper surface of the Fresnel lens is phi, in the equation, lambda is the central wave length of the incident light, and n is the refractive index of the material of the Fresnel lens on the surface of the solar battery; the width and the interval of the etching grooves are designed according to the Huygens-Fresnel principle, and are calculated by using a Fresnel wave band method. As the Fresnel lens is integrated with the solar battery, a high-performance, small-size and high-efficiency photovoltaic system is achieved, the reflectivity of the surface of the solar battery is effectively reduced, the absorbing length of photon on a PN junction area of the solar battery is effectively prolonged, the light field strength of the incident light in the PN junction area of the solar battery is effectively improved, and the effective absorption of the photon in the PN junction area of the solar battery is improved.

The invention relates to a chassis component for a motor vehicle comprising at least one first and a second individual component (12, 14) to form a composite component (10) having a plurality of hollow chambers, wherein the first individual component (12) has increased ductility for absorbing impact energy caused by an accident and the second individual component (142) has increased rigidity relative thereto.

The invention provides an aircraft fire alarm detection device and method based on CO2 gas concentration monitoring. A dual-wavelength infrared monitoring principle and a diffusion type structure are adopted, based on the continuous monitoring of the concentration of CO2 gas of an aircraft in flight in a low-temperature low-pressure environment, the fire alarm detection of an aircraft is carried out; the detection device and method have the advantages of capability of being adaptive to a low-temperature low-pressure atmospheric environment, heating, preserving heat, monitoring continuously online in a constant-temperature state, rapid response, high reliability, excellent waterproof and dustproof performances, no need of using an air pump, and the like, and can be widely applied to aircraft fire alarm detection systems. A dual-channel infrared detector is adopted for eliminating interferences caused by factors of light source instability and the like; a light reflection lens is adopted for lengthening the absorption length of infrared light; a heating element and a heat preservation material are adopted for reinforcing the environment adaptability; a conical light concentrator is adopted for increasing the received light intensity and compensating and correcting the temperature and air pressure automatically, so that the aircraft fire alarm detection reliability is improved effectively. The device and the method guarantee the rapidness and accuracy of aircraft fire disaster alarming.

The invention discloses a structure for increasing one-way gain by side pumping and an implementation method. A non-absorptive cladding material is bonded on the outer side of a gain medium, so that pumping light is reflected on an upper reflecting surface, a lower reflecting surface and side surfaces of a cladding; and the two side surfaces have a relative angle, the light travels back and forthalong the gain medium while being reflected by the side surfaces, so that the light can pass through the gain medium for multiple times, the absorption of the gain medium is increased, and the size ofthe gain medium is effectively reduced while the pumping light absorption frequency is increased. Because the pump light is reflected for multiple times and passes through the gain medium, the energydistribution of the pump light is more uniform, the cladding material has high thermal conductivity, the temperature gradient of the gain medium can be effectively reduced, the possibility of damaging a device is reduced, and the quality of an output light beam is improved.

The invention relates to a solar cell structure, comprising: a back electrode, a buffer layer, a background layer, a reflection layer, a base layer, an emission layer, a window layer, an anti-reflection layer, a contact layer and a grid line electrode formed sequentially on a substrate; , the base layer includes a first base layer and a second base layer, the second base layer is located on the first base layer, and the shape of the second base layer is a plurality of side-by-side triangular column-shaped protrusions. By adopting the solar cell structure provided by the present invention, the base layer is set in the shape of a triangular prism, which not only reduces the thickness of the base layer, but also reduces the thickness and weight of the battery, increases the length of light absorption, and increases the utilization of light The rate increases the external quantum efficiency, reduces the recombination of carriers, increases the internal quantum efficiency of the solar cell, and improves the conversion efficiency of the solar cell.

The invention provides a composite structure type laser amplifier. The composite structure type laser amplifier comprises a wedge-shaped laser slice coupler 3 and a wedge-shaped laser slice 1 used as a gain medium, wherein the wedge-shaped laser slice 1 and the wedge-shaped laser slice coupler 3 are both thin-long slices, and the longitudinal sections thereof are of isosceles trapezoid; the thick-end end planes of the wedge-shaped laser slice 1 and the wedge-shaped laser slice coupler 3 are coaxially spliced; and meanwhile, the thin-end end plane of the wedge-shaped laser slice coupler 3 receives an incident pumping laser beam, and the wedge-shaped laser slice coupler 3 couples the pumping laser beam to the wedge-shaped laser slice 1. According to the composite structure type laser amplifier, pumping light is incident from the thin-end end plane of the wedge-shaped laser slice coupler, so that pumping light absorption can be more uniform and coupling efficiency of the pumping light can be improved; the light is internally and totally reflected on boundary of the wedge-shaped laser slice, so that the absorption length of the absorbed light is prolonged and the wedge-shaped laser slice is uniformly pumped.

The invention relates to a laser gain chip, a laser assembly, a power amplifier and an oscillator, and belongs to the technical field of laser equipment. The laser gain chip comprises a laser source, a gain medium, a pumping source and cooling fluid, wherein the pumping source comprises a diode array and a coupling device which are connected; the laser source, the coupling device and the cooling fluid are respectively arranged in a way of corresponding to different side surfaces of the gain media; the transmission directions of cooling fluid, pumping light and laser are in perpendicular quadrature; a gradual change doping structure is arranged inside the gain medium along the transmission direction of the pumping light. The three fields including the pumping field, the laser field and the cooling fluid field are in perpendicular quadrature; the space coupling in the three fields is relieved, so that each field can be independently controlled; in addition, each gain medium has a unique pumping source; a plurality of laser gain chips are in cascade connection in the laser transmission direction; the power expansion can be realized; the operation is convenient; the engineering implementation is facilitated.

The invention discloses a preparation method of a side-incident SOI-based Si/SiGe HPT with a photonic crystal structure, and belongs to the technical field of semiconductors. The preparation method comprises the following steps: preparing an SOI-based Si/SiGe HPT epitaxial material on an SOI substrate, preparing the photonic crystal structure, etching to form a base region and a collector region table top, performing epitaxy of a passivation layer, etching of an electrode contact hole, and manufacturing a metal electrode. Compared with a traditional Si/SiGe HPT, theside-incident SOI-based Si/SiGe HPT has the advantages that incident light is trapped in the device by utilizing point defect and line defect characteristics of the photonic crystal, so that the light absorption rate of the device is improved, and meanwhile, compared with a vertical incidence mode, the light absorption length of the device can be increased under the condition that the thickness of an absorption layer is notchanged by adopting a mode of light incidence from the side surface; and the light absorptivity of the device is also improved.

The embodiment of the invention discloses an optical system for a multi-channel infrared detector. The system comprises an infrared light source, a concave collimating reflector, at least one plane reflector, a concave reflecting sub-mirror array and a multi-channel infrared detector, wherein the infrared light source is used for emitting an infrared light beam; the concave collimating reflector is used for reflecting and collimating the infrared beams; the plane mirror is used for prolonging the light path of the infrared light beam; the concave reflection sub-mirror array comprises a plurality of sub-mirrors; and detection channels in the multi-channel infrared detector are in one-to-one correspondence with the sub-mirrors. According to the system provided by the embodiment of the invention, the gas absorption length can be increased by prolonging the light path, so that the gas detection sensitivity is improved, and the light collection capability of a detection channel in the multi-channel infrared detector can be improved by focusing the infrared light beams by the sub-mirrors in the concave surface reflection sub-mirror array, so the sensitivity of the multichannel infrared detector is improved.