2008/06/17 by N. Kamaraju, Sunil Kumar, B. Karthikeyan +3
Engineering · Materials Science · Physics and Astronomy · #Absorption (acoustics) #Advanced Fiber Laser Technologies #Carbon Nanotubes in Composites #Carbon nanotube #Excitation #Femtosecond #Nonlinear Optical Materials Studies #Relaxation (psychology) #Saturation (graph theory) #Thin film #Ultrafast laser spectroscopy #Ultrashort pulse #cond-mat.mtrl-sci #cond-mat.other
paper · pdf · doi:10.1063/1.2977463
8 pages, 3 figures
arxiv created 2008/06/17 · openalex publication_date 2008/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Ultrafast degenerate pump-probe experiments performed on a freestanding film of double walled carbon nanotubes near the first metallic transition energy of outer tube show ultrafast (97 fs) photobleaching followed by a photoinduced absorption with a slow relaxation of 1.8 ps. Femtosecond closed and open aperture z-scan experiments carried out at the same excitation energy show saturation absorption and negative cubic nonlinearity. From these measurements, real and imaginary part of the third order nonlinear susceptibility are estimated to be Re(χ(3))∼−2.2×10−9 esu and Im(χ(3))∼4.5×10−11 esu.