Although transparent materials with birefringent properties (e.g., solar
panels and separator films for secondary cells) are common, damage
detection during the manufacturing process is crucial to economically
realize high-quality materials. Laser ablation can generate stress wave
passing through the material by non-contact impulse excitation. The
pulsed stress wave induces the change of stress concentrations around
damage, which can be measured as the two-dimensional birefringent phase
differences using Photron high speed polarization camera system with a
microsecond-order temporal resolution. It would allow us visual the
damage in the material without using any invasive measurement.