Time Behavior of Pulsed Output, Transverse Mode Pattern and Polarization Characteristics in Far Infrared CN Lasers

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Abstract
Experimental results on time behavior of pulsed output, transverse mode pattern, and polarization characteristics of the 311 or 337 µm CN lasers are presented. According to the behavior of the current pulse of discharge in a static gas filling, it is possible to find the conditions where the laser oscillation starts or ceases. The near field pattern of each mode passed through the wirecloth mesh mirror is obtained by sliding a Golay cell behind the mirror, and it is shown that the pattern of mode has usually complex structures and is largely changed when the mirror is tilted. The polarization characteristics of the laser light are determined by anisotropies in the cavity, and the polarization azimuth is changed by inserting an one-dimensional grid into the cavity. The polarization flip is observed by tuning through the line center of 311 and 337 µm, when the electroformed or wirecloth mesh mirror is used.