Enhanced sensing in a double-Raman superluminal ring laser

T. Y. Abi-Salloum; Selim M. Shahriar

doi:10.1117/12.2013166

6 March 2013 Enhanced sensing in a double-Raman superluminal ring laser

T. Y. Abi-Salloum, Selim M. Shahriar

Proceedings Volume 8636, Advances in Slow and Fast Light VI; 86361C (2013) https://doi.org/10.1117/12.2013166
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

We investigate the feasibility of realizing a superluminal ring laser with enhanced sensitivity by using the gain produced via double-Raman pumping in an inverted three-level system. If the laser cavity is tuned to the center between the two gain peaks produced in such a system, it is expected to experience an effective negative dispersion, which can be tuned to the condition necessary for enhancing the sensitivity of the laser frequency to a change in the cavity length. Using a model of two idealized, independent Lorentzian gains, we solve the laser equations to show the enhancement of sensitivity. We then extend our analysis to calculate the gain profile in a real lambda system. Unlike the idealized system mentioned above, where the dual gain peaks are modeled as two adjacent Lorentzians in a manner that ignores the relative coherence between the Raman pumps, we present a more accurate model where this coherence is not neglected. As such, the Hamiltonian remains time dependent after making the rotating wave transformation. Using an approximation --- valid for practical systems --- where higher order terms in the density matrix are neglected, we determine the gain experienced by a weak probe beam. Numerical techniques are needed to incorporate the resulting gain and dispersion profiles into the laser equation to determine accurately the behavior of the superluminal laser. This work will be carried out in the near future. Experimental realization of a superluminal laser based on this approach may prove to be easier than other approaches proposed previously.

Citation Download Citation

T. Y. Abi-Salloum and Selim M. Shahriar "Enhanced sensing in a double-Raman superluminal ring laser", Proc. SPIE 8636, Advances in Slow and Fast Light VI, 86361C (6 March 2013); https://doi.org/10.1117/12.2013166

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KEYWORDS

Raman spectroscopy

Systems modeling

Laser beam diagnostics

Optical pumping

Slow light

Dispersion

Laser resonators

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