Orientational relaxation in polymer and dye solutions and its consequence for the laser threshold

Organic Semiconductor Lasers

“…These are usually configured as conventional dye lasers, with resonators of a few centimetres in length. In these lasers the conjugated polymer is diluted (at typically a few parts per thousand concentration by weight) in a solvent ,,,,,− or passive polymer host. ,, Typical resonators either comprise a pair of mirrors around a cuvette or polymer block, or include a diffraction grating in place of one mirror, in either a Littrow or Hänsch cavity configuration (the diffraction grating may replace the mirror by orienting it such that the first-order diffracted light is retroreflected back into the cavity. By rotating the diffraction grating, one may thereby tune the lasing wavelength).…”