A laser rectangular filter with deep cut-off of visible light and its design method

Abstract

The invention belongs to the technical field of optical thin films, and particularly relates to a visible light band deep cut-off laser rectangular light filter and a design method thereof. According to the design method of the laser rectangular light filter, a multi-cavity light filtering thin film is divided into two symmetrical parts to be simultaneously deposited on the internal surfaces of gluing substrates so that the problem of preparation error accumulation of the multi-cavity light filter can be avoided. The cut-off depth of a cut-off band can be controlled by adjusting the number of cycles of long wave pass and short wave pass cut-off of the external surfaces of the two substrates for the light filtering thin film. The light filtering element provided by the design method is suitable for the fused quartz substrate and the glass substrate, more than 95% of transmittance in the 532nm laser wavelength can be realized, the bandwidth is less than 1.5nm and the cut-off depth is less than 1x10<-4>.

Description

technical field [0001] The invention belongs to the technical field of optical thin films, in particular to the design and preparation technology of optical filter elements, and in particular relates to an -4 Laser rectangular filter with deep cut-off in visible light band and design method. Background technique [0002] With the development of laser devices and detection technology, photoelectric systems based on active lasers have been widely used, and various laser application systems such as laser radar, laser fuze, laser altimeter, laser ranging, laser beacon, and laser communication have emerged. , to promote the development of modern optoelectronic technology. For example, lidar technology has developed atmospheric detection lidar, ocean detection lidar, air rendezvous and docking lidar, obstacle avoidance lidar, space high-resolution earth observation, chemical composition detection lidar, etc. Regardless of the application in which field, the accuracy and sensitiv...

AI Technical Summary

Problems solved by technology

[0006] The present invention proposes a laser rectangular optical filter with a deep cut-off of visible light and a design method to solve the technical problem of how to be highly transparent and have a small passband bandwidth for a specific wavelength of laser light, while having a deep cut-off in the rest of the waveband

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