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Materials with thermal-invariant elastic properties of materials are ofinterest for resonant device frequency and dimensional stability of precisiondevices. Here, we demonstrate that the temperature coefficient of elasticity(TCE) of amorphous silica can be locally reduced using femtosecond laserirradiation. Notably, a self-organized laser-induced modification shows adecrease of the TCE beyond 50%. The origin of this dramatic decrease isattributed to the presence of sub-micron permanent densified zones within thefine multi-layers structure of the laser-modified zone.

On the abnormal temperature dependent elastic properties of fused silica irradiated by ultrafast lasers