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International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices

Stimulated emission on sodium D-lines using broadband optical pumping

Timofey D. Petukhov, Gennadiy S. Evtushenko, S. N. Torgaev, Evgeny N. Telminov

Published Jun 1, 2017• 0 citations
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Abstract

This paper considers the issue how to obtain the amplification of stimulated emission in the cell with sodium vapor using a longitudinally pumped dye laser arrangement at a line shorter than the transitions from the ground state to the levels D1and D2. The broadening of the emission wavelength is calculated.
DOI
10.1109/edm.2017.7981770

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The first step of the hybrid excitation in the experiment was achieved by using a pulse broadband ($\\sim$200 {\\AA}) dye laser beam through a heat pipe oven. But the total covered pumping wavelength region from 4600 {\\AA} to 6800 {\\AA} the populated upper electronic state in Na2Na_{2}Na2​ should be either AprimeSigmauA^{\\prime}\\Sigma_{u}AprimeSigmau​ or BprimePiuB^{\\prime}\\Pi_{u}BprimePiu​ state. The excited sodium dimers Na2astNa_{2}^{\\ast}Na2ast​ transfered their energy to sodium atoms Na by near resonace collisions and the Na then would populate up the 3P level from ground state 3s. The Na were consequentely pumped up to 4D, 5D, 5S or 6S level from 3P by using a narrowband dye laser pumped by the same N2N_{2}N2​ laser. The infrared stimulated radiation corresponding to the transitions of 4D-4P(2.34 mu\\mumum). 5D-4P(5.02mu\\mumum), 5S-4P(3.42 mu\\mumum) and 6S-5P(7.52 mu\\mumum) with cascade stimulated emission from 4P to 4S (2.20 mu\\mumum) and from 5P to 5S (5.43 mu\\mumum) were then obtained, Furthermore the dependence of the output energy on the pumping wavelengthes was measured and discussed.
We describe experiments on the excitation of amplified spontaneous emission on the D -lines of sodium ( D 2 = 588.9 nm; D 1 = 589.6 nm) with longitudinal optical pumping with a large detuning from the D 2 line toward shorter wavelengths. The radiation spectra are measured, showing gain on both lines, at a Na concentration of (1–5) × 10 14 cm –3 , buffer gas (helium) pressure of 600 Torr at the working temperature, and pumping power density of more than 1.5 MW/cm 2 . 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.