Coherence Enhanced Transient Lasing in XUV Regime
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abstract
We report the effect of a coherent drive on transient lasing in three-level $Lambda $ and $Xi$ configurations ($cleftrightarrow aleftrightarrow b$). We show that the presence of a resonant coherent drive on the $aleftrightarrow c$ optical transition can yield an order of magnitude enhancement of the output laser energy on a $a ightarrow b$ XUV or X-ray transition than with no coherent drive. We demonstrate the crucial role of coherence $varrho_{ac}$ for the laser power enhancement. Contrary to the forward direction (with respect to the pump), where forward gain can be enhanced for some choice of the drive Rabi frequency $Omega_{c}$, coherent drive on the $ac$ transition always suppresses the backward gain.
