New coherent cancellation effect involving four-photon excitation and the related ionization

Conference · Fri Oct 20 04:00:00 EDT 1989 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:7169327

Payne, M G; Garrett, W R; Judish, J P; McCann, M P ^[1]

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1. Chemical Physics Section, Oak Ridge National Laboratory, Oak Ridge, Tenneessee 37831-6378 (US)

We describe here an effect which occurs when a first laser is tuned near a dipole allowed three-photon resonance and a second laser is used to complete a dipole allowed four-photon resonance between the ground state {vert bar}0{r angle} and an excited state {vert bar}2{r angle}. In this process three photons are absorbed from the first laser and one photon from the second; so that if the {vert bar}0{r angle} to {vert bar}2{r angle} transition is two-photon allowed the transition is also pumped resonantly by the third harmonic field due to the first laser and the second laser field. When the second laser is strong enough to cause strong absorption of the third harmonic light, and the phase mismatch, {Delta}{ital k} is large and dominated by the nearby resonance, a destructive interference occurs between the pumping of the {vert bar}0{r angle} to {vert bar} 2{r angle} transition by two- and four-photon processes.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7169327
• Report Number(s): CONF-8810399--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Journal Volume: 191:1
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
COHERENT RADIATION
ELECTROMAGNETIC RADIATION
FREQUENCY MIXING
HARMONIC GENERATION
IONIZATION
MULTI-PHOTON PROCESSES
NONLINEAR OPTICS
OPTICAL PUMPING
OPTICS
POLARIZATION
PUMPING
RADIATIONS
STARK EFFECT