3results about How to "Improve polarization efficiency" patented technology

The application discloses a PZT-based textured piezoelectric ceramic and a phase transition assisted polarization preparation method and application thereof, and belongs to the technical field of piezoelectric materials. The preparation method comprises the following steps: preparing PMeN-PZT matrix powder; preparing a textured piezoelectric ceramic; and sequentially polishing the textured piezoelectric ceramic, sintering silver electrodes and performing phase transition assisted polarization to obtain the PZT-based textured piezoelectric ceramic; wherein the phase transition assisted polarization step is: heating the textured piezoelectric ceramic after sintering silver electrodes to a polarization temperature, the polarization temperature is higher than the trigonal-tetragonal phase transition temperature and lower than the Curie temperature, and the polarization is performed under a polarization electric field of 300 V / mm-1000 V / mm, then the polarization is naturally cooled to room temperature, and the electric field is removed. The technical problems of low piezoelectric / electromechanical / dielectric performance caused by insufficient polarization in traditional heating polarization and the technical problem that piezoelectric materials are difficult to have high piezoelectric performance and high Curie temperature at the same time are solved.

The invention provides a window for a laser radar, the laser radar and a preparation method of the window for the laser radar. The window is made of an organic material and comprises a first structural layer with an optical axis; when the window is placed in the vertical direction, the included angle between the optical axis direction of the first structure layer and the vertical plane where the first structure layer is located ranges from 35 degrees to 55 degrees. A light beam is transmitted at the first structural layer, and when the light beam is vertically incident relative to the first structural layer, the difference value between the phase difference generated after the light beam is transmitted by the first structural layer and the half-wavelength of the light beam is not larger than one fourth of the wavelength of the light beam.

The present application relates to a kind of deep ultraviolet grating polarizers and preparation method thereof, belong to polarizer technical field, including from bottom to top sequentially connected substrate, first dielectric layer, second dielectric layer and interval setting line grid on the upper surface of second dielectric layer, the upper surface of second dielectric layer between adjacent line grid is provided with metal layer, line grid includes from bottom to top sequentially connected first dielectric layer, second dielectric layer and metal layer;The present application is by adding high low refractive index alternately between substrate and metal line grid first, second dielectric layer, and metal layer is set on the upper surface of second dielectric layer in line grid gap, constructs the medium-metal composite structure with resonance coupling effect.The design effectively controls the equivalent optical admittance of deep ultraviolet band, significantly enhances the transmittance of TE polarized light, while maintaining the efficient inhibition to TM polarization, so as to improve the polarization efficiency while reducing metal absorption loss.As a whole, the polarizer has the advantages of high transmittance, high extinction ratio and the like.