Pulse-Bandwidth Dependence of Coherent Phase Control of Resonance-Mediated (2+1) Three-Photon Absorption

Abstract

We study in detail coherent phase control of femtosecond resonance-mediated (2+1) three-photon absorption and its dependence on the spectral bandwidth of the excitation pulse. The regime is the weak-field regime of third perturbative order. The corresponding interference mechanism involves a group of three-photon excitation pathways that are on resonance with the intermediate state and a group of three-photon excitation pathways that are near resonant with it. The model system of the study is atomic sodium (Na), for which experimental and numerical-theoretical results are obtained. Prominent among the results is our finding that with simple proper pulse shaping an increase in the excitation bandwidth leads to a corresponding increase in the enhancement of the three-photon absorption over the absorption induced by the (unshaped) transform-limited pulse. For example, here, a 40-nm bandwidth leads to an order-of-magnitude enhancement over the transform-limited absorption.

23 pages, 5 figures

Cited by in corpus (7)

• Multi-Channel Selective Femtosecond Coherent Control Based on Symmetry Properties
• Optimized production of ultracold ground-state molecules: Stabilization employing potentials with ion-pair character and strong spin-orbit coupling
• Enhancement of Intermediate-Field Two-Photon Absorption by Rationally-Shaped Femtosecond Pulses
• Frequency-Domain Coherent Control of Femtosecond Two-Photon Absorption: Intermediate-Field vs. Weak-Field Regime
• NIR Femtosecond Control of Resonance-Mediated Generation of Coherent Broadband UV Emission
• Femtosecond Photo-Induced Multiphoton Analog Computation for Symmetry-Based Pattern Classification
• Weak-Field Coherent Control of Ultrafast Molecule Making