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Laser Physics

Coherent population trapping with a train of pulses via a continuum and its application to the suppression of excited-state absorption

Elena Kuznetsova, Roman L. Kolesov, Olga A. Kocharovskaya

Published Sep 1, 2007• 0 citations
Publisher

Abstract

We discuss the coherent population trapping (CPT) effect induced in a three-level Λ-type system by a train of short pulses. Specifically, we consider a modified Λ system with the upper level replaced by a continuum of states. We show that CPT with a train of pulses can be applied to the suppression of excited-state absorption of pump radiation in crystalline laser materials. The utility of the technique for pumping a promising yellow-orange solid-state medium Ti:YAlO 3 and overcoming excited-state pump absorption is analyzed.

DOI
10.1134/s1054660x07090149

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We discuss the coherent population trapping (CPT) effect induced in a three-level Λ-type system by a train of short pulses. Specifically, we consider a modified Λ system with the upper level replaced by a continuum of states. We show that CPT with a train of pulses can be applied to the suppression of excited-state absorption of pump radiation in crystalline laser materials. The utility of the technique for pumping a promising yellow-orange solid-state medium Ti:YAlO 3 and overcoming excited-state pump absorption is analyzed.
We consider the coherent population trapping effect with a train of ultrashort pulses in a $\ensuremath{\Lambda}$-type system with two bound states and a continuum replacing the upper state. Population transfer to the continuum can be totally suppressed provided that the splitting between the bound states is a multiple of the pulse repetition rate. Compared to the traditional case with only two laser fields coupling the bound states to the continuum, CPT with a pulse train allows one to avoid incoherent population losses due to interaction of the fields with ``wrong'' transitions, which results in only partial suppression of ionization. A method of suppression of excited-state absorption of pumping radiation in laser crystals, with pumping in the form of the pulse train, is proposed. As a particular example pumping dynamics of a Ti3+:YAlO3{\mathrm{Ti}}^{3+}:{\mathrm{YAlO}}_{3}Ti3+:YAlO3​ crystal using this technique is numerically analyzed.
Here, I discuss the interaction of two matched ultrashort pulses with a \ensuremath{\Lambda}-like system in which the upper intermediate state is replaced by a manifold of discrete states. Many of these states are simultaneously accessed by the broad bandwidth of the two excitation pulses. The equations of motion for the probability amplitudes of the levels involved in the excitation process are solved analytically in the quasi-impulsive regime. In this regime, the excitation pulses are made shorter than the characteristic time of the excited manifold; population is then transferred to the manifold without Rabi cycling. Under the appropriate conditions, this ``multi-\ensuremath{\Lambda}'' system can exhibit coherence effects such as coherent population trapping and electromagnetically induced transparency of one of the excitation pulses.
The population trapping in highly excited atomic states under intense femtosecond Ti:sapphire transform limited and chirped laser pulse action is studied. It is demonstrated that trapping appears as a result of the multiphoton resonance between the initial ground state and a set of excited states near the continuum boundary accompanied by repopulation of the Rydberg states by the Raman Λ-type transitions via the continuum and the interference stabilization. The specific features of the population trapping in both positively and negatively chirped pulses are analyzed and discussed.
This paper presents the search for physical mechanisms and on their basis of selective modulation of the optical frequencies in a distribution of multi-frequency laser radiation is one of the most important problems whose solution will greatly expand the capabilities of existing systems DWDM. One well-known physical effects, providing effective selective interaction of optical radiation with a material medium is the interaction of electromagnetic fields with three-level, or Λ systems. In these three-level system is observed fundamental physical phenomenon a coherent population trapping (CPT). One of the first practical examples of the CPT is to stabilize the emission frequency of optical frequency standards for optical bench, which is a resonance of CPT.
We have detected and analysed interesting features of sub-Doppler resonances, which are induced in absorption of the weak monochromatic probe light beam (with the scanned frequency) by the counterpropagating two-frequency pumping radiation implementing the phenomenon of the coherent population trapping (CPT) on resonant Λ-systems of atomic levels. Our experimental investigations have been carried out on example of spectral components of the Doppler broadened D2line of cesium atoms. Obtained results may be used for optimization of laser frequencies stabilization on atomic transitions.