Title :
Pump saturation in molecular far-infrared lasers
Author_Institution :
Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
fDate :
10/1/1976 12:00:00 AM
Abstract :
Precise absorption measurements on vibration-rotation transitions pumping far-infrared (FIR) laser transitions in HCOOH, CH3OH, CH3I and CH3F were carried out using a frequency-stabilized and intensity-controlled CO2laser. Linear absorption coefficients and saturation intensities as a function of pressure are obtained. With the help of a rate equation model it is concluded that within the pressure range relevant for CW FIR lasers the rate of deexcitation of pumped molecules is limited by rotational relaxation. For CH3F, limitation by diffusion of excited molecules to the cell wall is observed.
Keywords :
Absorption; Equations; Finite impulse response filter; Frequency measurement; Laser excitation; Laser modes; Laser transitions; Optical pumping; Pump lasers; Vibration measurement;
Journal_Title :
Quantum Electronics, IEEE Journal of
DOI :
10.1109/JQE.1976.1069049
