Ferjani Sameh, Barna Valentin, De Luca Antonio, Versace Carlo, Strangi Giuseppe
Licryl CNR-INFM and CEMIF. Cal Center of Excellence Innovative Materials for Photonics, Department of Physics,University of Calabria, I-87036 Rende CS, Italy.
Opt Lett. 2008 Mar 15;33(6):557-9. doi: 10.1364/ol.33.000557.
Random lasing in fully disordered systems having organic and inorganic nature has been the subject of extensive studies since the beginning of the past decade. The interest mainly emerges from the unexpected role played by disorder in the laser action. The disorder was considered detrimental for the optical feedback in cavity laser, until it was demonstrated that multiple-scattering materials including a gain medium act as random laser. Here, a completely new approach is reported, where freely suspended complex fluid films doped with fluorescent molecules under optical excitation generate narrowband lasing peaks. The constellation of localized modes is selected by properly choosing the gain profile. The idea to have laser action in absence of mirrors and boundaries realizes an unparalleled tunable and moldable laser source.
自过去十年初以来，具有有机和无机性质的完全无序系统中的随机激光一直是广泛研究的主题。这种兴趣主要源于无序在激光作用中所起的意想不到的作用。在证明包括增益介质在内的多重散射材料可作为随机激光器之前，无序被认为对腔激光器中的光反馈有害。在此，报道了一种全新的方法，即在光激发下，掺杂有荧光分子的自由悬浮复合流体薄膜会产生窄带激光峰。通过适当选择增益分布来选择局域模的组合。在没有镜子和边界的情况下实现激光作用的想法实现了一种无与伦比的可调谐和可成型激光源。
