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Control of laser writing in transparent dielectrics using temporal contrastof light pulses is demonstrated. Anisotropic nanopores in silica glass areproduced by high-contrast of 10^7 femtosecond Yb: KGW laser pulses rather thanlow-contrast of 10^3 Yb fiber laser pulses. Low-contrast pulses are useful forcreating lamellar birefringent structures, possibly driven by quadrupolenonlinear current. The difference originates in the fiber laser storing thirdof its energy in a post-pulse of 200 ps duration. The absorption of thislow-intensity fraction of the pulse by laser-induced transient defects withrelatively long lifetime and low excitation energy, such as self-trapped holes,drastically changes the kinetics of energy deposition and type of materialmodification.

Controlling ultrafast laser writing in silica glass by pulse temporal contrast