The propagation characteristics of the fundamental Gaussian laser beam in absorptive and active media are investigated. There is a general reduction in the spreading of the beam on propagation in both absorptive and active media. In addition, in an active medium there is a shift of the focal plane and a reduction in the waist size of the beam.
No takes yet. Share an insight, caveat, or question.
S. R. Seshadri (2004) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: