超快激光

Abstract(#br)Plasma-mediated ablation using ultrafast lasers in transparent media such as aqueous tissues is studied. It is postulated that a critical seed free electron density exists due to the multiphoton ionization in order to trigger the avalanche ionization which causes ablation and during the avalanche ionization process the contribution of laser-induced photon ionization is negligible.

Abstract(#br)We report a simple and inexpensive method for producing super-hydrophobic surfaces through direct replication of micro/nano-structures on polydimethylsiloxane (PDMS) from a replication master prepared by ultrafast-laser texturing process. Gratings were obtained on 304L stainless steel plate using picosecond laser ablation. It has been used as a master with grating areas of different structural features. PDMS negative replica was prepared from the masters, and PDMS positive replica was prepared from the negative replica thereafter.