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Created by sebastien.popoff on 15/07/2013
Control of random lasing by wavefront shaping of the pump[N. Bachelard et al., Phys. Rev. Lett., 109, (2012)] [M. Leonetti et al., Appl. Phys. Lett., 102, (2013)] [N. Bachelard et al., arXiv, 1303.1398, (2013)] [T. Hirsch et al., Phys. Rev. Lett., 111, (2013)]
While conventional lasers use mirrors to confine light in a cavity with gain to achieve spontaneous emission, random lasers take advantage of multiple scattering to trap light in a disordered medium [1]. Such lasers do not require to carefully tune the geometry of the cavity, which greatly simplifies their design. They are potentially cheaper and more robust in the presence of perturbations (temperature, vibration). The resulting emission spectrums and radiation patterns are broad but mainly uncontrolled. In recent studies [2-5] different groups demonstrated numerically and experimentally the modulation of the spatial profile of the pump to control the spectrum [2-4] or the emission pattern [5]. |