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Spectral line shape of resonant four-wave mixing induced by broad-bandwidth lasers

Spectral line shape of resonant four-wave mixing induced by broad-bandwidth lasers
Spectral line shape of resonant four-wave mixing induced by broad-bandwidth lasers
We present a theoretical and experimental study of the line shape of resonant four-wave mixing induced by broad-bandwidth laser radiation that revises the theory of Meacher, Smith, Ewart, and Cooper (MSEC) [Phys. Rev. A 46, 2718 (1992)].

We adopt the same method as MSEC but correct for an invalid integral used to average over the distribution of atomic velocities. The revised theory predicts a Voigt line shape composed of a homogeneous, Lorentzian component, defined by the collisional rate Γ, and an inhomogeneous, Doppler component, which is a squared Gaussian. The width of the inhomogeneous component is reduced by a factor of √2 compared to the simple Doppler width predicted by MSEC. In the limit of dominant Doppler broadening, the width of the homogeneous component is predicted to be 4Γ, whereas in the limit of dominant homogeneous broadening, the predicted width is 2Γ.

An experimental measurement is reported of the line shape of the four-wave-mixing signal using a broad-bandwidth, "modeless", laser resonant with the Q1 (6) line of the A2 Σ - X2 Π(0,0) system of the hydroxyl radical. The measured widths of the Voigt components were found to be consistent with the predictions of the revised theory.
1050-2947
2347-2355
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Ewart, P.
ff22a0d8-2e47-46cf-a721-64b5f68da6a3
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Ewart, P.
ff22a0d8-2e47-46cf-a721-64b5f68da6a3

Smith, P.G.R. and Ewart, P. (1996) Spectral line shape of resonant four-wave mixing induced by broad-bandwidth lasers. Physical Review A, 54 (3), 2347-2355. (doi:10.1103/PhysRevA.54.2347).

Record type: Article

Abstract

We present a theoretical and experimental study of the line shape of resonant four-wave mixing induced by broad-bandwidth laser radiation that revises the theory of Meacher, Smith, Ewart, and Cooper (MSEC) [Phys. Rev. A 46, 2718 (1992)].

We adopt the same method as MSEC but correct for an invalid integral used to average over the distribution of atomic velocities. The revised theory predicts a Voigt line shape composed of a homogeneous, Lorentzian component, defined by the collisional rate Γ, and an inhomogeneous, Doppler component, which is a squared Gaussian. The width of the inhomogeneous component is reduced by a factor of √2 compared to the simple Doppler width predicted by MSEC. In the limit of dominant Doppler broadening, the width of the homogeneous component is predicted to be 4Γ, whereas in the limit of dominant homogeneous broadening, the predicted width is 2Γ.

An experimental measurement is reported of the line shape of the four-wave-mixing signal using a broad-bandwidth, "modeless", laser resonant with the Q1 (6) line of the A2 Σ - X2 Π(0,0) system of the hydroxyl radical. The measured widths of the Voigt components were found to be consistent with the predictions of the revised theory.

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Published date: September 1996
Organisations: Optoelectronics Research Centre

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Local EPrints ID: 77994
URI: http://eprints.soton.ac.uk/id/eprint/77994
ISSN: 1050-2947
PURE UUID: a772601b-6fab-43f2-971a-ae5edfdbe476
ORCID for P.G.R. Smith: ORCID iD orcid.org/0000-0003-0319-718X

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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 02:38

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Author: P.G.R. Smith ORCID iD
Author: P. Ewart

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