Abstract
Two novel ethyne-linked polymers (P1 and P2) were synthesized and characterized. Via femtosecond Z-scan, their nonlinear optical properties were investigated. Both polymers exhibit obvious reverse saturable absorption and self-defocusing. Using phase object pump-probe method, their transient absorption and refraction dynamic traces are measured and the mechanism of their optical nonlinearities is analyzed. The results indicate that two-photon absorption (TPA) mainly dominants nonlinear absorption of P1 and P2. The TPA coefficients are approximate 24.7 × 10−2 cm/GW for P1 and 3.12 × 10−2 cm/GW for P2. Through the extrapolation fitting, the estimated OL threshold for P1 is on the order of 10−2 J/cm2. On the other hand, both polymers display negative excited-sate refraction which is strong enough to dominate the transient nonlinear refraction over solvent effect. The refractive volumes of each effective state are determined. Our results indicate that ethyne-linked polymers have good nonlinear optical properties under femtosecond pulse excitation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
