Ablation of BaWO4 Crystal by Ultrashort Laser Pulses

Abstract

Ablation of BaWO4 Raman crystals with different impurity concentrations by ultrashort laser pulses was experimentally studied. Laser pulses with duration varying from 0.3 ps to 1.6 ps at wavelengths of 515 nm and 1030 nm were applied. A single-pulse optical damage threshold of the crystal surface changed from 1.3 J/cm2 to 4.2 J/cm2 depending on the laser pulse parameters and BaWO4 crystal purity. The optical damage threshold under multi-pulse irradiation was an order of magnitude less.

Frequency down-conversion of a chirped Ti:sapphire laser pulse with BaWO4 Raman shifter and second-order nonlinear crystal

“…∆ν, cm −1 g R , cm GW −1T 2 , ps Sellmeier equations Absorption, cm −1 W th , J cm −2 (1 µm, ps-ns) 925 [16] 16 at 0.75 µm [16, 18] 6.6 [18] [19] 0.01 at 0.75 µm [20]∼3[20] …”