Optical extration efficiency in lasers with high Fresnel number confocal unstable resonators
Abstract
Using the formulation of Moore and McCarthy (1977) for the equation describing the dominant mode in a positivebranch confocal unstable resonator in the geometrical optics limit and a simple twolevel kinetics model, the dependence of the optical extraction efficiency on resonator magnification (M), length (L), small signal gain (g sub 0), and (nonsaturable) background absorption (alpha). The model has cylindrical symmetry and spatially uniform small signal gain, absorption, and index of refraction. For fixed gamma equal to g sub 0/alpha and M, a value of g sub 0 times L that maximizes the optical extraction efficiency is found. For different gamma, the maximum obtainable value of the optical extraction efficiency is found to be independent of M and to depend upon gamma in a simple way.
 Publication:

Applied Optics
 Pub Date:
 November 1979
 DOI:
 10.1364/AO.18.003562
 Bibcode:
 1979ApOpt..18.3562C
 Keywords:

 Geometrical Optics;
 Laser Outputs;
 Optical Resonators;
 Efficiency;
 Eigenvalues;
 Power Efficiency;
 Lasers and Masers;
 RESONATORS;
 LASERS