Coherence-Enhanced Lasing

We report the effect of a coherent drive on transient lasing in three-level $\Lambda $ and $\Xi$ configurations ( $c\leftrightarrow a\leftrightarrow b$ ). We show that the presence of a resonant coherent drive on the $a\leftrightarrow c$ optical transition can yield an order of magnitude enhancement of the output laser energy on a $a\rightarrow b$ 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.We report the effect of a coherent drive on transient lasing in three-level $\Lambda $ and $\Xi$ configurations ($c\leftrightarrow a\leftrightarrow b$). We show that the presence of a resonant coherent drive on the $a\leftrightarrow c$ optical transition can yield an order of magnitude enhancement of the output laser energy on a $a\rightarrow b$ 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.

Bulletin of the American Physical SocietySep 13, 20110 citations

Stimulated emission and lasing

Sergey V. Gaponenko, Hilmi Volkan Demir

Cambridge University Press eBooksNov 23, 20180 citations

Using Quantum Coherence to Enhance Gain in Atomic Physics

Pankaj Kumar Jha

Quantum coherence and interference effects in atomic and molecular physics has been extensively studied due to intriguing counterintuitive physics and potential important applications. Here we present one such application of using quantum coherence to generate and enhance gain in extreme ultra-violet(XUV)(@58.4nm in Helium) and infra-red(@794.76nm in Rubidium) regime of electromagnetic radiation. We show that using moderate external coherent drive, a substantial enhancement in the energy of the lasing pulse can be achieved under optimal conditions. We also discuss the role of coherence. The present paper is intended to be pedagogical on this subject of coherence-enhanced lasing.Quantum coherence and interference effects in atomic and molecular physics has been extensively studied due to intriguing counterintuitive physics and potential important applications. Here we present one such application of using quantum coherence to generate and enhance gain in extreme ultra-violet(XUV)(@58.4nm in Helium) and infra-red(@794.76nm in Rubidium) regime of electromagnetic radiation. We show that using moderate external coherent drive, a substantial enhancement in the energy of the lasing pulse can be achieved under optimal conditions. We also discuss the role of coherence. The present paper is intended to be pedagogical on this subject of coherence-enhanced lasing.

arXiv:1301.6663Coherent PhenomenaJan 25, 20136 citations

Coherence enhanced transient lasing in XUV regime

P K Jha, Anatoly A. Svidzinsky, Marlan O. Scully

We report the effect of a coherent drive on transient lasing in three-level Λ and Ξ configurations ( c ↔ a ↔ b ). We show that the presence of a resonant coherent drive on the a ↔ c optical transition can yield an order of magnitude enhancement of the output laser energy on a a → b extreme ultraviolet (XUV) or X-ray transition than with no coherent drive. We demonstrate the crucial role of coherence ϱ ac for the laser power enhancement. Contrary to the forward direction (with respect to the pump laser), where forward gain can be enhanced for some choice of the drive Rabi frequency Ω c , coherent drive on the ac transition always suppresses the backward gain.We report the effect of a coherent drive on transient lasing in three-level Λ and Ξ configurations ( c ↔ a ↔ b ). We show that the presence of a resonant coherent drive on the a ↔ c optical transition can yield an order of magnitude enhancement of the output laser energy on a a → b extreme ultraviolet (XUV) or X-ray transition than with no coherent drive. We demonstrate the crucial role of coherence ϱ ac for the laser power enhancement. Contrary to the forward direction (with respect to the pump laser), where forward gain can be enhanced for some choice of the drive Rabi frequency Ω c , coherent drive on the ac transition always suppresses the backward gain.

arXiv:1109.2841Laser Physics LettersApr 19, 20129 citations

We report the effect of a coherent drive on transient lasing in three-level $\Lambda $ and

\Xi

configurations (

c\leftrightarrow a\leftrightarrow b

). We show that the presence of a resonant coherent drive on the

a\leftrightarrow c

optical transition can yield an order of magnitude enhancement of the output laser energy on a

a\rightarrow 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.