Adaptive Optics (AO)
Failure Analysis
Black discoloration often indicates water leakage from the mount or moisture in the beam purge. Improper cleaning with tissue paper, acetone, or ethanol will gradually damage the coating.
Beam not parallel through one or more axis, Struck the lens holder. Beam mark not centred (or) Improper mounting of optics. Improper mirror alignment.
Distorted mode can generate a massive energy to be concentrated into a small spot on the mirrors, leading to a mirror explosion. In most cases, incorrect beam mode occurs because of mirror misalignment or failure in the beam delivery cooling system.
Probable causes improper cleaning (may have residue), poor quality cleaning supplies like lens cleaner, lens cleaning tissue paper etc too aggressive cleaning (scratches also), poor quality lens.
