The Study Of Liquid Oxygen Fluorescence

Liquid oxygen is a potential medium for high energy laser. Firstly, it’s absorption coefficient was very high, so the volume of the liquid oxygen laser is much smaller than other high energy lasers. Secondly, Under the condition of634nm laser pump, it’s quantum efficiency was80%. The wavelength of liquid oxygen laser was1580nm, it was exactly at atmospheric transition window and had a excellent transition in the atmosphere, at the same time,1580nm wavelength is relatively safe than other laser wavelength for human eyes. It has remarkably significant to investigate the electronic excited level、 vibrational energy level lifetime and small signal gain around1580nm of liquid oxygen. In this paper, Liquid oxygen was excited by optical, via measuring different wavelength time resolved fluorescence spectra to obtain their energy level lifetime. Finally, The small signal gain of the liquid oxygen around1580nm is measured using amplification method in the case of detection light. The major contents and conclusions are as following:Under the condition of634nm laser pump, Fluorescence spectra were observed at wavelengths of481nm、634nm、703nm and764nm by using Time-Correlated Single-Photon Counting method and obtained their energy level lifetime.The energy relaxation time of the lowest vibrational level of liquid oxygen in the ground electronic state was investigated by measuring it’s time resolved anti-stokes Raman scattering spectra. The experiment result were compared with calculations of the energy relaxation.The small signal gain of the liquid oxygen around1580nm is measured using amplification method in the case of detection light, An ideal experiment result was obtained, The experiment result were compared with calculations and the experiment result provide to be corrected.