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Archives of physics research

On the nature of spatial hole burning and lasing without inversion

Rajib Kumar Dubey, Gaurangadhar Baruah

Published Jan 1, 2010• 0 citations
OpenAlex

Abstract

In the present work it has been shown that the phenomenon of spatial hole burning in semi classical theory remains unaffected in Lasing without inversion. The notion of stimulated decay is introduced for Lasing without inversion

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A study of Absorption and Spatial Hole Burning in Laser action

Rajib Kumar Dubey, Gauranga Dhar Baruah

The population inversion is required to overcome absorption and to achieve lasing with inversion but in case of lasing without inversion absorption is cancelled via the processes of quantum interference. In this work an analysis of the two process has been made using the phenomenon of spatial hole burning of semiclassical theory of laser

Archives of physics research•Jan 1, 2012•0 citations

Degenerate quantum-beat laser: Lasing without inversion and inversion without lasing

Marlan O. Scully, Shi-Yao Zhu, Athanasios Gavrielides

A single lasing mode driven by a three-level ``quantum-beat'' atomic configuration can show gain without population inversion or optical absorption into an excited state without spontaneous or stimulated emission.

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Mirrorless Lasing: A Theoretical Perspective

Aneesh Ramaswamy, Jabir Chathanathil, Dimitra Kanta +7 more

Mirrorless lasing has been a topic of particular interest for about a decade due to promising new horizons for quantum science and applications. In this work, we review first-principles theory that describes this phenomenon, and discuss degenerate mirrorless lasing in a vapor of Rb atoms, the mechanisms of amplification of light generated in the medium with population inversion between magnetic sublevels within the $${{D}_{2}}$$ line, and challenges associated with experimental realization.

arXiv:2308.07969•Optical Memory and Neural Networks•Dec 1, 2023•7 citations

Lasing without inversion: progress and prospects

Olga A. Kocharovskaya

We review the recent achievements both in the theory and experiment on lasing without inversion. We discuss also the potential applications of these novel laser sources and the prospects for the further development of this domain.

17th Congress of the International Commission for Optics: Optics for Science and New Technology•Sep 1, 1996•0 citations

Steady-state ab initio laser theory for complex gain media

Alexander Cerjan, Y. D. Chong, A. Douglas Stone

We derive and test a generalization of the steady-state ab initio laser theory (SALT) to treat complex gain media. The generalized theory (C-SALT) is able to treat atomic and molecular gain media with diffusion and multiple lasing transitions, and semiconductor gain media in the free carrier approximation including fully the effect of Pauli blocking. The key assumption of the theory is stationarity of the level populations, which leads to coupled self-consistent equations for the populations and the lasing modes that fully include the effects of openness and non-linear spatial hole-burning. These equations can be solved efficiently for the steady-state lasing properties by a similar iteration procedure as in SALT, where a static gain medium with a single transition is assumed. The theory is tested by comparison to much less efficient finite difference time domain (FDTD) methods and excellent agreement is found. Using C-SALT to analyze the effects of varying gain diffusion constant we demonstrate a cross-over between the regime of strong spatial hole burning with multimode lasing to a regime of negligible spatial hole burning, leading to gain-clamping, and single mode lasing. The effect of spatially inhomogeneous pumping combined with diffusion is also studied and a relevant length scale for spatial inhomogeneity to persist under these conditions is determined. For the semiconductor gain model, we demonstrate the frequency shift due to Pauli blocking as the pumping strength changes.

arXiv:1406.6659•Optics Express•Mar 2, 2015•35 citations

Lasing without inversion: A useful concept?

Paul Mandel

The historical development that led to the modern concept of amplification and losing without inversion is reviewed. The two basic mechanisms for amplification without inversion and their theoretical formulation are discussed. Finally, the three experiments that confirm the occurrence of these effects are described.

Contemporary Physics•Sep 1, 1993•138 citations
Mirrorless lasing has been a topic of particular interest for about a decade due to promising new horizons for quantum science and applications. In this work, we review first-principles theory that describes this phenomenon, and discuss degenerate mirrorless lasing in a vapor of Rb atoms, the mechanisms of amplification of light generated in the medium with population inversion between magnetic sublevels within the D2{{D}_{2}}D2​ line, and challenges associated with experimental realization.
We derive and test a generalization of the steady-state ab initio laser theory (SALT) to treat complex gain media. The generalized theory (C-SALT) is able to treat atomic and molecular gain media with diffusion and multiple lasing transitions, and semiconductor gain media in the free carrier approximation including fully the effect of Pauli blocking. The key assumption of the theory is stationarity of the level populations, which leads to coupled self-consistent equations for the populations and the lasing modes that fully include the effects of openness and non-linear spatial hole-burning. These equations can be solved efficiently for the steady-state lasing properties by a similar iteration procedure as in SALT, where a static gain medium with a single transition is assumed. The theory is tested by comparison to much less efficient finite difference time domain (FDTD) methods and excellent agreement is found. Using C-SALT to analyze the effects of varying gain diffusion constant we demonstrate a cross-over between the regime of strong spatial hole burning with multimode lasing to a regime of negligible spatial hole burning, leading to gain-clamping, and single mode lasing. The effect of spatially inhomogeneous pumping combined with diffusion is also studied and a relevant length scale for spatial inhomogeneity to persist under these conditions is determined. For the semiconductor gain model, we demonstrate the frequency shift due to Pauli blocking as the pumping strength changes.