Ultrafast Degenerate Transient Lens Spectroscopy in Semiconductor Nanosctructures A.V. Leontyev, D.K. Zharkov, A.G. Shmelev, V.G. Nikiforov and V.S. Lobkov EPJ Web of Conferences, 103 (2015) 07002 Published online: 25 September 2015 DOI: 10.1051/epjconf/201510307002