A vertical cavity surface emitting laser (VCSEL) device, comprising: a bracket that has a hollow cavity (2) and a VCSEL chip (1) encapsulated in the hollow cavity (2), wherein the bracket comprises a base (3) and a di...
标准号:
WO2019/165769(A1)
A vertical cavity surface emitting laser (VCSEL) device, comprising: a bracket that has a hollow cavity (2) and a VCSEL chip (1) encapsulated in the hollow cavity (2), wherein the bracket comprises a base (3) and a diffusion sheet (4) used for sealing the base (3), the VCSEL chip (1) is encapsulated on the base (3), and the diffusion sheet (4) is disposed above a light emergent surface of the VCSEL chip (1), such that light emitted from the VCSEL chip (1) traverses the diffusion sheet (4) and is emitted to the outside;a cut-off film (5) is disposed on the diffusion sheet (4), a through hole (6) is opened on the cut-off film (5), and the through hole (6) is disposed above the light emergent surface of the VCSEL chip (1), such that the light emitted from the VCSEL chip (1) penetrates the through hole (6), and then traverses the diffusion sheet (4) and is emitted to the outside. The flexible adjustment of the light-emitting angle is achieved by means of combining the VCSEL chip (1) with the diffusion sheet (4). Additionally, by means of disposing the cut-off film (5) on the diffusion sheet (4), the light scattered on the cut-off film (5) is reflected back outside of the VCSEL device, thereby improving the light emergence effect.
The CW RF test of 1.3 GHz 9-cell cavity in liquid helium bath at 2 K is a very important key point in the cavity procurement. Some problems can be found through the test, according which to optimized and improve the p...
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A suitable treatment method for decentralized sewage remediation in drinking water protection source zones of rural areas in Beijing is concerned in this *** anaerobic biological treatment process,it has the lowest co...
A suitable treatment method for decentralized sewage remediation in drinking water protection source zones of rural areas in Beijing is concerned in this *** anaerobic biological treatment process,it has the lowest construction and operating costs,but its treatment effect is *** MBR process has the feature of high operating cost, complicated operation and membrane's short-lived *** aerobic biological treatment process,the effluent still can not attain the discharge standard.A transformed treatment process -‘A/O + the quartz sand filtration + activated carbon adsorption', with a satisfied treatment effect,is proposed in this paper.
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