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Quantum Electronics

Inversionless amplification of light by molecules selectively oriented over states in the field of laser radiation

A. V. Shamshurin, Igor A. Kuzovatov, A.S. Tsipotan, Vitaliy V. Slabko

Published Nov 12, 2018• 0 citations
Publisher

Abstract

A possibility of inversionless amplification of light by non-dipole molecules oriented state-selectively by means of superimposing of external laser radiation is considered. Various variants of mutual direction of electrical vectors of the probe and orienting fields are numerically analysed for specific ratios of the orientation parameters of the ground and excited states both in pulsed and stationary regimes. It is shown that the variant in which the signs of the orientation parameters of the ground and excited states are opposite is the most promising. The latter can be implemented in selection of the orienting field frequency.

DOI
10.1070/qel16741

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•Jan 1, 2020•0 citations
A possibility of inversionless amplification of light by non-dipole molecules oriented state-selectively by means of superimposing of external laser radiation is considered. Various variants of mutual direction of electrical vectors of the probe and orienting fields are numerically analysed for specific ratios of the orientation parameters of the ground and excited states both in pulsed and stationary regimes. It is shown that the variant in which the signs of the orientation parameters of the ground and excited states are opposite is the most promising. The latter can be implemented in selection of the orienting field frequency.
The possibility of inversionless amplification of light by dichroic polar molecules oriented selectively by states by applying an external pulsed electric field is considered. It is shown that when the orienting field is switched on abruptly, transient processes occur that lead to an increase in the light gain coefficient, which can be several times greater than its value in the quasi-stationary mode. An interpretation of the effect is given based on a comparison of the interaction energy of molecules with the orienting field in the ground and excited states.
The possibility of inversion-free amplification of light by dichroic molecules that can be oriented selectively over states by application of an external field is analyzed. The effect of the relation between the life-time of the excited state and the time of stabilization of orientation equilibrium on the amplification factor is considered on the basis of the coupled system of Boltzmann equations for the ground and excited states, which are characterized by different energies of interaction with the orienting field.
Switching anisotropic molecules from strongly-absorbing to strongly-amplifying through a transparent state is shown to be possible by application of dc or ac control electric fields without the requirement of the population inversion. It is based on decoupling of the lower-level molecules from the resonant light while the excited ones remain emitting due to their state-dependent alignment. The amplification index may become dependent only on a number of excited molecules and not on the population of the lower state. A suitable class of molecules and applications in optoelectronics, fiberoptics and nanophotonics are outlined.
In standard lasers, light amplification requires population inversion between an upper and a lower state to break the reciprocity between absorption and stimulated emission. However, in a medium prepared in a specific superposition state, quantum interference may fully suppress absorption while leaving stimulated emission intact, opening the possibility of lasing without inversion. Here we show that lasing without inversion arises naturally during propagation of intense femtosecond laser pulses in air. It is triggered by the combination of molecular ionization and molecular alignment, both unavoidable in intense light fields. The effect could enable inversionless amplification of broadband radiation in many molecular gases, opening unusual opportunities for remote sensing.
In standard lasers, light amplification requires population inversion between an upper and a lower state to break the reciprocity between absorption and stimulated emission. However, in a medium prepared in a specific superposition state, quantum interference may fully suppress absorption while leaving stimulated emission intact, opening the possibility of lasing without inversion. Here we show that lasing without inversion arises naturally during propagation of intense femtosecond laser pulses in air. It is triggered by the combination of molecular ionization and molecular alignment, both unavoidable in intense light fields. The effect could enable inversionless amplification of broadband radiation in many molecular gases, opening unusual opportunities for remote sensing. © 2020 Optical Society of America