Title :
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
fDate :
1/1/1991 12:00:00 AM
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;
Journal_Title :
Quantum Electronics, IEEE Journal of
