(Color online) Optical delivery system. M is mirror, BS is beam splitter, L is lens, D is
detector, H is half wave plate, P is polarizer, and He–Ne is helium-neon laser; paths of
the guiding and the Ti-sapphire beams are shown by the sketch. The inset displays the
image of a laser-ablated area on the surface of the biofilm taken by the CCD camera.