부산대학교 도서관

We take advantage of the dual emission properties of up-conversion fluorescence (UCF) and second harmonic generation (SHG) in Er[sup.3+]-doped perovskite Na[sub.0.95]Er[sub.0.05]Nb[sub.0.9]Ti[sub.0.1]O[sub.3] to fully temporally characterize the ultrashort laser pulse that excites Er[sup.3+]-ion fluorescence. The chirped pulses from a broadband Ti:Sa oscillator are temporally characterized using the dispersion scan (d-scan) technique by using the SHG signal in the host perovskite at the same point where UCF is being produced by the same pulse. The pulse durations obtained range from ~45 fs to ~8 fs and positive and negative spectral phases are unambiguously identified. The temporal characterization is compared using a standard non-linear crystal and perfect agreement is obtained. These results show that it is possible to temporally characterize in-situ ultrashort laser pulses while they are inducing a UCF process, as long as the host generates second-harmonic signal.
Author(s): Óscar Pérez-Benito; Rosa Weigand (corresponding author) [*] 1. Introduction Particles with emission in different spectral ranges are interesting for a variety of research fields, such as bioimaging and photodynamic [...]