Separated Optical Fields in Double Quantum Transitions
Interactions of atoms and molecules with intense monochromatic laser standing waves can give rise to very narrow Doppler-free two-photon resonances. This new high-resolution spectroscopic method has recently been extensively applied to the study of several atomic and molecular optical transitions. The discovery and accurate measurement of these narrow, frequency-stable resonance lines in the emission and absorption spectra of substances, are significant because advances in this area will not only provide direct clues to the innermost processes of matter, but may also lead to novel applications in many areas of science.
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