LD fundamental frequency / double-frequency multi-wavelength laser composite detection / ranging system

Abstract

The present invention relates to an LD fundamental frequency / double-frequency multi-wavelength laser composite detection / ranging system. In order to obtain high-power and lightweight laser sourcesin 460-560nm band, a fundamental frequency light output is provided by a mature and high-power 915nm and 1120nm semiconductor laser units, then non linear crystals such as KDP are used to obtain a 457.5nm(hereinafter referred to as 460 nm) laser output through double frequency on 915nm laser, and to obtain a 560 nm laser output through double frequency on 1120 nm laser. When the system is used for water surface mobile platforms to perform large-scale laser searching / ranging over underwater targets, two pairs of lasers, 915nm / 460nm and 1120nm / 560nm can be respectively directed to different directions; when the system is used for underwater mobile platforms to find suitable landing points for submarine media detection, different media can be used to judge reflectivity difference between 460nm and 560nm lasers, the system is a laser detection / ranging composite system suitable for both airborne and underwater use.

Description

Technical field [0001] The LD fundamental frequency / frequency doubling multi-wavelength laser composite detection / ranging system of the invention belongs to the application field of semiconductor laser technology, and is a dual-channel laser detection / ranging composite system suitable for airborne / underwater. Background technique [0002] Underwater unmanned vehicles and deep submersibles are today's main platforms for underwater detection, target detection and engineering construction, while water drones replace manned aircraft to conduct large-scale surveys of the sea, state surveys in shallow waters, and rescue at sea The main force of monitoring, given that the above-mentioned platforms are characterized by small carrier, light weight, and limited power supply capacity, a laser detection / ranging system with compact structure, low power consumption and particularly suitable for underwater application bands is required. [0003] The present invention is proposed on the basis of a...

AI Technical Summary

Problems solved by technology

[0004] 1. At present, most of the 532nm lasers suitable for underwater work at home and abroad are obtained by doubling the frequency of 1064nm solid-state pulse lasers. Due to the low electro-optic conversion efficiency and the difficulty of compressing the laser scale, it is difficult to be suitable for small load platforms;

[0005] 2. The traditional airborne laser system usually scans the water surface with a single beam, which is difficult to balance the requirements of scanning range, search speed and ranging distance. If the number of laser scanning channels is increased, the burden on the airborne aircraft will be increased;

[0006] 3. According to the survey results of the light wave reflectivity of several typical materials on the seabed, the best wavelengths for laser detection of underwater mud, sand or vegetation are 460nm and 560nm, although the best lasers should be semiconductor lasers, but The laser power in this band is not high, but the price is high

Images