The scope of laser technologies in dermatology has expanded dramatically in recent years. Dermatology laser procedures, including the removal of vascular and pigmented lesions, tattoos, scars, and undesired hairs, are becoming increasingly popular worldwide. At the same time, progress in diode technology has enabled the production of compact, efficient and inexpensive high-brightness laser diodes in the red spectral region, which makes them an ideal optical pump source for low-cost Alexandrite lasers, one of the most popular in optical technologies for dermatology.

In this regard, a new theoretical model for CW diode-pumped Alexandrite lasers, developed by in the paper by W.R. Kerridge-Johns and M.J. Damzen, which for the first time includes the effects of excited state absorption in an active medium, is the next step to efficient and inexpensive laser design. The uniqueness of this approach is that it is generally valid and, therefore, can be useful for any end-pumped quasi three-level laser system.

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