Observation of enhanced laser emission and new laser transitions in triple cascade operation of an optically pumped cw HCOOH submillimeter laser

Stimson, P. A.; James, B. W.; Falconer, I. S.; Whitbourn, L. B.; Macfarlane, J. C.
March 1987
Applied Physics Letters;3/30/1987, Vol. 50 Issue 13, p786
Academic Journal
We report an investigation of the enhancement of the output power and the observation of new cw lasing transitions for an optically pumped formic acid laser when the resonator length is adjusted so that it is simultaneously resonant for adjacent rotational cascade transitions. Cascade operation was found to be a particularly useful technique for increasing the power of the second transition of a cascade sequence. New cw transitions were observed at 418 μm (the third member of the 394 μm, 406 μm cascade), 447 μm (the third member of the 419 μm, 432 μm cascade), and 460 μm (the third member of the 433 μm, 446 μm cascade).


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