Subjects: Materials Science >> Electronic, Optical and Magnetic Materials Subjects: Physics >> Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics submitted time 2022-05-08
Abstract:
In this work, the near ultraviolet femtosecond laser pulse is used to fabricate waveguides and Bragg gratings in poly methyl pentene (PMP). It is observed that the polymer exhibits sensitivity for the light polarization. In low NA processing, by supercontinuum spectrum estimation, the process window of peak power ranges from 2.2MW to 9.2MW. It is inferred that the nonlinear refractive index is n2387=2×10-16cm2W-1 and the third-order susceptibility χ(3) is calculated to be 1.1×10-14esu. Filamenting-process length varies from 300μm to 1500μm along with the increase of pulse energy and the length is a power function of peak energy with power index of ~ 0.53. The maximum of refractive index change is 0.01 which is inferred from the first grating diffraction efficiency, an order higher than the previous figures. These results show that the pulse peak intensity is critical to induce nonlinear absorption in terms of the two-photon absorption. The experimental data provides the latest data for scientific researchers and optical engineers.
Peer Review Status:Awaiting Review