Study On Time-Domain Character Of Blue-Green Laser Transmitting Underwater

Studying on time-domain character of blue-green laser pulse underwater has important value in the fields of target detecting in the sea, the ocean depth detecting, communication between submarine and laser system and so on. In this paper, the time-domain characters of blue-green laser pulse underwater have been studied from numerical value simulation and experiment.It simulates the time-domain broadening of optical pulse transmitted through different distance. The past studies generally imagine the receiving caliber infinity. But in this paper, it gains the wave width broadening in different sites and different square to receive which aims at the practical detection system. It makes the simulation closer to the practice, and has more effective meaning for guidance.Design the experimental equipment that uses the nanosecond laser for the lamp-house, uses the PVC pipe to taking on the water and detects the signal by the PIN pipe to investigate time-domain character of blue-green laser pulse underwater. Detect the data of wave width broadening when the laser has passed through different distance and the water with different optical parameters. The results inosculate the numerical value simulation quite well.Based on the experiments above, it has also discussed the polarization character. From the result it can be concluded that the polarization of the linear polarized light will reduce nearly linear when the length of the laser transmits underwater increases. There are several investigations about the polarization character to be reported. However, it is the basic of the aspects on importing the technique of polarized gate and increasing the SNR. The research has important impact on both academic value and application foreground. It is the important aspect to invest in the future.