Rock processing with laser

Patent Granted A method in which even when quartz glass or silicon dioxide is deposited as a molten dross by laser irradiation, boring can be conducted. Work object (100) at its laser irradiation position (12) is irradiated through liquid ( 31) with a laser of 1.2 .mu.m or greater wavelength being high in liquid abs orbability, for example, CO2 laser emitted from laser oscillator (20) so tha t while any molten dross is scattered off by high pressure occurring in bubb les in microbubble advancing flow (13) generated in the liquid, boring or ot her working of rock (100) is carried out.