Abstract
Random lasers (RLs) with spatially distributed feedback (SDF) use highly scattering particles, randomly distributed into the gain medium, as feedback elements for lasing action [1]. An alternative approach consists of RLs with spatially localized feedback (SLF) in which the gain medium is enclosed between two scattering surfaces, providing feedback and output coupling [2]. Emission spectra from RLs, both with SDF and SLF, are unpredictable as lasing frequencies are randomly distributed in spectrum [3]. Here, we present a fabrication approach which allows to tailor the average number of lasing modes in RLs with SLF [4]. The active medium is a dye doped polymer film, in which two parallel grooves, placed at a distance of 3 mm, are obtained by pulsed laser ablation with different pulse durations (100 fs and 30 ps) and energies, EP. The RL with SLF is obtained by pumping at 532 nm a rectangular region placed between and limited by the grooves.
© 2019 IEEE
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