2024/01/17 by Yuhao Lei, Huijun Wang, Lei, Yuhao +7
Engineering · Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #Laser Material Processing Techniques #Laser-Matter Interactions and Applications #Laser-induced spectroscopy and plasma #Optics (physics.optics)
paper · pdf · doi:10.48550/arxiv.2401.09055
openalex publication_date 2024/01/17 · openalex created_date 2024/01/19 · openalex updated_date 2026/07/28
Control of laser writing in transparent dielectrics using temporal contrast of light pulses is demonstrated. Anisotropic nanopores in silica glass are produced by high-contrast of 107 femtosecond Yb: KGW laser pulses rather than low-contrast of 103 Yb fiber laser pulses. Low-contrast pulses are useful for creating lamellar birefringent structures, possibly driven by quadrupole nonlinear current. The difference originates in the fiber laser storing third of its energy in a post-pulse of 200 ps duration. The absorption of this low-intensity fraction of the pulse by laser-induced transient defects with relatively long lifetime and low excitation energy, such as self-trapped holes, drastically changes the kinetics of energy deposition and type of material modification.