Related Experiment Video
Updated: May 13, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
Published on: August 6, 2018
Probing electronic coherences by combined two- and one-photon excitation in atomic vapors
Eugenijus Gaižauskas1, Dionysios Pentaris, Thomas Efthimiopoulos
1Vilnius University, Laser Research Center, Vilnius 10222, Lithuania. eugenijus.gaizauskas@ff.vu.lt
Abstract:
Wave mixing in a three-level quantum system induced by two-photon resonant pump and one-photon resonant coupling at lower transition has been studied theoretically and experimentally. Resonantly enhanced difference-frequency generation efficiency was observed clearly dependent on the time delay and its sign between the femtosecond pump and probe. The role of the atomic coherences on the amplification without inversion during different sequences of interaction in a closed three-level system has been also stressed. These findings were confirmed experimentally in atomic potassium, where strong parametric amplification, induced by the pump delayed with respect to the probe, has been observed for the first time.
Related Concept Videos
Atomic Emission Spectroscopy: Interference
Atomic Emission Spectroscopy: Instrumentation
Atomic Absorption Spectroscopy: Atomization Methods
Atomic Spectroscopy: Absorption, Emission, and Fluorescence
Double Resonance Techniques: Overview
Spin decoupling is usually achieved by...
Atomic Emission Spectroscopy: Overview

