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Symposium on Photonics and Optoelectronics

Effect of the Bloch-Siegert Shift in a Strongly Driven Transition: High-Order Autler-Townes Doublets

Lijun Yang, Min Zhao, Lianshui Zhang, Xiaomin Feng

Published Aug 1, 2009• 0 citations
Publisher

Abstract

The effect of the Bloch-Siegert shift on a strongly driven transition is further investigated in a V-shaped three-level configuration. Under the condition of taking into account the counter-rotating component, the absorption profiles of the probe field is dominated by a series of doublets, including well-known Autler-Townes doublet and its high-order resonances. The dependence of properties of the secondary Autler-Townes doublet on the driving Rabi intensity is discussed in this paper.

DOI
10.1109/sopo.2009.5230321

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C. Wei, Neil B. Manson

Summary form only given.It is well known that a strongly driven transition exhibits a doublet splitting when probed by a weak field, commonly known as AC Stark splitting. It can be observed either by probing the driven two-level itself (Mollow-type spectrum) or via a third level (Autler-Townes-type spectrum). These two type splittings can have very different characteristics, particularly when driven resonantly. The absorptive Mollow spectrum consists of two dispersion-like features, whereas for the Autler-Townes spectrum there is a simple doublet splitting. In this paper we report the observation of both Mollow and Autler-Townes spectrum simultaneously by applying two strong driving fields in a three-level configuration.

Conference on Lasers and Electro-Optics•Nov 27, 2002•0 citations
The effect of the Bloch-Siegert shift on a strongly driven transition is further investigated in a V-shaped three-level configuration. Under the condition of taking into account the counter-rotating component, the absorption profiles of the probe field is dominated by a series of doublets, including well-known Autler-Townes doublet and its high-order resonances. The dependence of properties of the secondary Autler-Townes doublet on the driving Rabi intensity is discussed in this paper.
Under the conditions of the rotating wave approximation (RWA), a transition strongly driven by a resonant oscillating field displays the well known symmetric Autler - Townes doublet. However, if the counter-rotating component, neglected in the RWA, is taken into account, the Bloch - Siegert shift gives rise to an Autler - Townes doublet of unequal intensity even in the case of a resonant driving field. This effect is investigated theoretically in a V-shaped three-level double-resonance configuration and the results are presented in this paper. An interesting observation is that the level of asymmetry not only depends on the driving-field intensity but also on the characteristics of the driven system including relaxation rates and equilibrium population distributions.
The effect of the Bloch–Siegert shift on a strongly driven transition is studied in a three-level double-resonance configuration and the result is presented in this paper. We show that when a resonantly driven transition is probed to a third level, the Bloch–Siegert shift leads to an asymmetric Autler–Townes doublet. An important conclusion is that the asymmetry depends only on the driving field intensity, in contrast to a previous study where it is reported that the asymmetry depends not only on the driving field intensity but also on the characteristics of the three-level system. Our result implies an alternative way of measuring the Bloch–Siegert shift.
Analytic expressions for the peak positions and pump frequency shift of equal intensity weak probe Autler-Townes transitions to a third level in the presence of a linearly polarized pump field are given. It is found that the presence of the third level affects the pump field dressing of the strongly excited two levels. A comparison of the Bloch-Siegert shift estimated by this weak probe technique with earlier methods suggests this condition provides a practical method for obtaining the Bloch-Siegert shift for three level systems where the pump field does not directly excite the probe transition. If the pump field off-resonantly drives the probe transition, additional light shifts occur which may dominate the Bloch-Siegert shift.
This paper reports on experimental investigations of absorption, dispersion, and amplitude profiles of the Autler-Townes doublet in a ssV-shaped three-level system where the probe field intensities varied from weak to strong. The experiments were carried out on the ground-state hyperfine transitions of the nitrogen-vacancy color center in diamond using the Raman heterodyne technique, a sensitive optically detected magnetic resonance technique. A strong pump field is on resonance with the Iz{\mathit{I}}_{\mathit{z}}Iz​=\ensuremath{\Vert}0〉\ensuremath{\leftrightarrows}\ensuremath{\Vert}1〉 transition at 4.7 MHz and the resultant Autler-Townes profiles are probed with a separate field scanning through the Iz{\mathit{I}}_{\mathit{z}}Iz​=\ensuremath{\Vert}0〉\ensuremath{\leftrightarrows}\ensuremath{\Vert}-1〉 transition at 5.4 MHz. As the probe power increases the absorptive profile of the Autler-Townes doublet becomes saturated and power broadened and the two components overlap constructively. In contrast, the inner parts of the two dispersive doublet components interfere destructively due to a \ensuremath{\pi} phase difference. The amplitude profile has an anomalous line shape at high probe intensity due to the different saturation behaviors of the absorptive and dispersive components. The experimental profiles are in good agreement with theoretical profiles calculated by solving the equation of motion of the density matrix under the steady-state limit.
Summary form only given.It is well known that a strongly driven transition exhibits a doublet splitting when probed by a weak field, commonly known as AC Stark splitting. It can be observed either by probing the driven two-level itself (Mollow-type spectrum) or via a third level (Autler-Townes-type spectrum). These two type splittings can have very different characteristics, particularly when driven resonantly. The absorptive Mollow spectrum consists of two dispersion-like features, whereas for the Autler-Townes spectrum there is a simple doublet splitting. In this paper we report the observation of both Mollow and Autler-Townes spectrum simultaneously by applying two strong driving fields in a three-level configuration.