Open AccessTime-resolved measurements of optical properties in ultrafast laser interaction with polypropylene
Author(s) -
Arifur Rahaman,
Aravinda Kar,
Xiaoming Yu
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.384302
Subject(s) - optics , transmittance , materials science , laser , absorptance , attenuation coefficient , absorption (acoustics) , ultrashort pulse , integrating sphere , optoelectronics , reflectivity , physics
Time-resolved, single-shot measurements are performed to determine the reflectance, transmittance, and absorptance in ultrafast laser interaction with polypropylene for a wide range of laser pulse energies. An ellipsoidal mirror is used to collect the majority of the reflected light, enabling the detection of plasma emission starting at about 40 ns after the incident pulse. The measured transmittance is explained by a model that takes into account different effective absorption channels, and the non-linear absorption coefficient is estimated, which suggests that the non-linear absorption originates from the two-step or two-photon absorption through overtone. The results are useful for selecting laser parameters in the processing of polymeric materials.