Femtosecond laser inscription of polarized-sensitive volume phase grating in nanoporous glass

With the growth of laser technologies in photonics, the volume phase elements fabrication in transparent material by ultrashort laser is widely attractive. Femtosecond laser writing (FLW) step was applied for the polarized-sensitive volume phase gratings (VPGs) inscription in the nanoporous silicate matrix (NPSM). The formed VPGs with thickness L = 54 ± 0.5 μm to 77 ± 0.5 μm, and shows the diffraction efficiency 8% and 14%，respectively. VPG in NPSM presents the ability to detect polarization. Different polarization angles correspond to different diffraction efficiency from 2% to 14%. Moreover, owing to the porous character of the NPSM plate, diffraction efficiency of impregnated VPG with distilled water and rhodamine 6G acetone solution were investigated. The achieved results in our experiment provides evidence to the possibility of VPG as a sensor application.