"We describe filamentary crack-free modification in silica glass, pyrex glass and soda-lime glass by a CW Laser Backside Irradiation (CW-LBI) method. In this method, an absorbent, which is attached on one side of a glass plate, is irradiated from the opposite side through the glass with CW laser beam. Arion laser is used and metal foil is chosen as absorbent. An intense flash moving from the absorbent toward the opposite direction of the incident laser beam at the speed of approximately 20cm/s is observed and then modification appears in the flashed zone. With increasing irradiated laser power, the length of modification increases but the diameter is almost constant. Our experiments indicate the start of this modification may be due to thermal absorption from the heated absorbent by laser irradiation."
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