Study On The Laser Fuse Receiver Testing Optical System Based On Tunable Nanosecond Pulsed Ld

As a result of the urgent demand of modern combat environment and the rapid development of semiconductor laser technology, laser fuse, one kind of proximity fuse, is invented. Owing to its high accuracy of ranging and high anti-jamming ability, it is widely used in a variety of missiles and it greatly increases the hit rate and the damage effect of the weapon system. Therefore, we developed a laser fuse receiver testing optical system, which could simulat and increase the function of Laser fuse transmitter. Then the nanosecond pulse laser output is obtained, which has adjustable peak power, adjustable pulse width, adjustable repetition rate with a very short rise time. All of these are in a way significant to laser fuse engineering.In accordance with the above issue, the main works of this paper are as follows:1. Based on the analysis of the working principle and the set distance mode of laser fuse, the technical requirements and the overall design scheme of Laser fuse receiver testing optical system.2. Develop one kind of pulsed LD power supply which could make the LD perform 120W of peak power.(1)According to the analysis of the principle of pulsed LD power supply, the function among the rise time, the peak current, the parasitic inductance, the discharge electricity circle resistance and the capacity voltage was obtain. The circle resistance and the parasitic inductance were estimated by analysing the discharge waveform.(2)After the comparative analyses of many experiments, in which FPGA was used as a signal source, the program that VMOS 18N50 which drove by UCC37321/2 control the energy storage capacitor to pump LD was selected.(3)The high current tunable power supply of nanosecond pulse LD was designed by adjusting the positions of the components, optimizing the PCB and reducing the parasitic inductance of the discharge electricity circuit. As a result, the nanosecond electric pulse with short rise time (1.67ns), wide range of the tunable pulse width (6.55ns~102.6ns) and high peak current (30A) was acquired.3. An optical system composed of rod lens, collimating lens and density disc was used to attenuate, collimate and expand the LD emission beam, the best laser output was obtained, including the highest peak power of 44 W at the outlet, the beam diameter of 50 mm, the adjustable attenuation from 0 to 40 dB and the divergence angle of 0.28°. When the attenuation was 0 dB, the overall transmission efficiency was 36.7%, which could meet the test requirement of the Laser fuse receiver testing.