Journal of Modern Optics

Lasing without population inversion in an Er3+-doped YAG crystal

Mostafa Sahrai, Seyyed Hossein Asadpour, A. Eslami-Majd, Rasoul Sadighi‐Bonabi

Published Nov 10, 2011• 16 citations

Abstract

Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.

DOI: 10.1080/09500340.2011.634974

Related papers

Optical bistability and lasing without inversion in a system of driven two-level atoms with incoherent injection

Guo Qin Ge, Ying Wu, Xueli Luo +1 more

We have studied a laser system in which initially incoherent atoms are injected into a cavity and directly driven by a coherent pump field. Here we show that such a system can display optical bistability in the absence of population inversion. Two disconnected branches of the solutions are obtained for lasing action. They correspond to the inversion branch and inversionless branch, respectively. Also, a mechanism is proposed here to produce higher-power lasing by the inversionless laser.

Physical Review AAug 1, 199514 citations

Lasing without population inversion: efficient frequency up-conversion by incoherent pumping fields

F. F. Popescu

In this paper we have studied the possibility to reach an efficient frequency up-conversion by using two incoherent pumping fields. At the same time, the noise of the generated field is not high, because the generation does not depend on the frequency overlapping, or the phase mismatching of the three involved fields. In this case the system acts as a laser without population inversion. Another advantage of this up-conversion mechanism is the generation of coherent radiation by using incoherent pumping fields. Consequently, the proposed up-conversion mechanism is not limited in frequency by the available coherent radiation for pumping fields. Higher frequency coherent radiation than that obtained up to now could be generated.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEJun 29, 20010 citations

Lasing without inversion in a closed three-level system

Yifu Zhu

It is shown that a closed V-type, three-level system, which is incoherently pumped on the transition at which lasing occurs and coherently pumped on the other transition, exhibits lasing without population inversion in any atomic state basis. The same system can be also made to exhibit lasing without population inversion in the bare atomic state basis but with population inversion in the dressed-state basis.

Physical Review AMay 1, 1992126 citations

Lasers without inversion: A closed lifetime broadened system

A. Imamolu, J. E. Field, Stephen E. Harris

We show a model laser system which operates by an electromagnetically induced interference. Provided that an inversion condition for the thermal radiation field is satisfied, the system lases without atomic population inversion in steady state. The system is pumped by incoherent radiation on the transition on which lasing occurs.

Physical Review LettersMar 4, 1991305 citations

A Model on Understanding Atomic Coherence in Lasing Without Inversion

Luo Zhenfei, Xu Zhi-Zhan

A laser model which may operate in the absence of population inversion is proposed. It is found that the realization of lasing without inversion in this model is due to the change of noninversion condition along with the creation of atomic coherence, instead of a coherence-term-induced gain enhancement.

Chinese Physics LettersNov 1, 19920 citations

Role of incoherent pumping and Er 3+ ion concentration on subluminal and superluminal light propagation in Er 3+ -doped YAG crystal

Seyyed Hossein Asadpour, HAMID RAHIMPOUR SOLEIMANI

We study the absorption-dispersion process and group index of weak probe field in a four-level Er 3+ :YAG crystal. We find that the Er 3+ ion concentration and incoherent pumping field can influence the absorption-dispersion process and group index of weak probe field. Moreover, our results show that Er 3+ ion concentration plays a major role in lasing without inversion and absorption with inversion.

Chinese Physics BJan 1, 20158 citations