Strontium vapour laser with ionisation and recombination mechanisms of inversion formation

We have experimentally and numerically investigated a multiwavelength strontium vapour laser which simultaneously emits both in the IR spectrum range on the self-terminating transitions in strontium atoms and ions ($\lambda = 6.456$ and $\sim3\mu m$ for Sr I, and $\lambda\approx 1\mu m$ for Sr II) and in the visible range on the recombination transition in strontium ions ($\lambda = 0.4305 \mu m$ for Sr II). A number of regularities in the behaviour of the output characteristics of lasing, which allow for a targeted search for optimal excitation conditions of the multiwavelength strontium vapour lasers, are established.