Amplification of spontaneous emission on sodium D-lines using nonresonance broadband optical pumping

摘要

This work describes an experimental study of obtaining the amplified spontaneous emission (ASE) on sodium D-lines using nonresonance broadband optical pumping. ASE is observed at transitions D_2 and D_1 line: 589 nm (3~2P_(3/2) - 3~2S_(1/2)) and 589.6 nm (3~2P_(1/2) - 3~2S_(1/2)). The active medium was pumped by the dye laser with FWHM of 5 nm, maximum radiation in the range 584.5-586.5 nm, and pulse energy above 2 mJ. The working temperature of the active medium was 260℃, initial pressure of buffer gas-helium was 300 torr (operating pressure - 500 torr). A change in the absorption spectra at D lines at different temperatures of the active medium and buffer gas pressures was observed.