Gain anisotropy and simultaneous bidirectional emission of a Doppler-broadened MIR optically-pumped ammonia ring laser

Author

Wazen, P. ; Bourdet, G.L.

Author_Institution

Lab. d´´Opt. Appliquee, Ecole Polytech.-ENSTA, Palaiseau, France

Volume

27

Issue

1

fYear

1991

fDate

1/1/1991 12:00:00 AM

Firstpage

152

Lastpage

157

Abstract

The authors studied the Doppler-broadened 11.76-μm ¹⁵NH₃ emission line optically pumped in a ring resonator by a CW CO₂ laser operating on the 10R(42) line. Behavior related to the optical pumping of gas Doppler-broadened lines is found and shown to be very dependent on the laser parameters. For instance, the laser emission can occur in one direction or two directions simultaneously. A local gain model based on the interaction of two laser fields with a three-level molecular system is used to clarify the emission characteristics of this laser. Basically, the two-photon or Raman process and the Rabi splitting generate a gain anisotropy and an anomalous dispersion curve. The effects lead to a different optical path for the two directions of propagation and, consequently, a simultaneous bidirectional emission with unequal emission frequency

Keywords

Doppler effect; ammonia; gas lasers; optical pumping; ring lasers; spectral line breadth; 10R(42) line; 11.76 micron; ¹⁵NH₃ emission line; CO₂; CW CO₂ laser; Doppler-broadened; NH₃ ring laser; Rabi splitting; Raman process; anomalous dispersion curve; gain anisotropy; laser emission; laser field interactions; local gain model; mid IR; optical path; optically-pumped; ring laser; simultaneous bidirectional emission; three-level molecular system; two-photon processes; unequal emission frequency; Anisotropic magnetoresistance; Gas lasers; Geometrical optics; Laser excitation; Laser modes; Optical pumping; Optical ring resonators; Pump lasers; Ring lasers; Stimulated emission;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.73554

Filename

73554