Abstract
A CO TEA laser, cooled to 77°K by a surrounding liquid‐nitrogen bath, is found to exhibit laser action on approximately 60 transitions over the spectral range 4.960–5.610 μm. Following a single 0.5‐μsec excitation pulse, lasing action is observed to continue up to 2 msec with 15 Torr of CO and up to 4 msec with a 14‐Torr CO–N2 mixture.

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