Vol. 30, issue 10, article # 12

Abstract:

Experiments are described on the excitation of amplified spontaneous emission on the D-lines of sodium (D₂=588.9 nm; D₁ = 589.6 nm) at longitudinal optical pumping with a large detuning from the D₂ line toward shorter wavelengths. The radiation spectra are measured, which proves gain on the both lines, at  Na concentration of (1–5) ∙ 10¹⁴ cm^–3, buffer gas (helium) pressure of 600 Torr at the working temperature, and pumping power density of more than 1.5 MW/cm². The time characteristics show that the output radiation varies versus the concentration of sodium atoms in the active medium. The dependences of radiation absorption at the D-lines of sodium on the concentration of Na atoms and buffer gas pressure are given.

Keywords:

active optical system, amplified spontaneous emission, alkaline metals, sodium, optical pumping

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