Optically Pumped Distributed Feedback (DFB) 496 μm CH3F Laser

Abstract

Waveguide DFB Theory In previous papers |1| we have reported on the first operation of a DFB gas laser, an optically pumped 496 μm CH3F laser with periodic metal waveguide structure |2|. The period of the original waveguide structure was equal to half the laser free-space wavelength, i.e. 248 μm. However, first experiments on the DFB gas laser in operation indicated that the period should be adapted to the laser wavelength modified by the finite cross section of the guide.