Comment on "TeV Cerenkov events as Bose-Einstein gamma condensations"

The idea that the TeV air showers, thought to be produced by gamma rays gre ater than 10 TeV from Markarian 501, can be mimicked by coherent bunches of sub-TeV photons is reexamined, focusing on fundamental considerations. In particular, it is shown that the minimum spot size of a beam of photons arr iving at Earth is on the order of a few kilometers unless a lens with certa in characteristics is placed between the TeV laser and Earth. The viability of the production mechanism of coherent bunches of TeV photons proposed by M. Harwit et al. is also reassessed.