WebMar 31, 1994 · In the course of investigating the radiative properties of a laser dye dispersed in a strongly scattering medium (a colloidal suspension of titanium dioxide particles), we have found that the... WebSep 1, 2024 · Random lasers made out of disordered media have a rich but often unpredictable laser light emission, in all directions and over many frequencies. Strategies …
Publications - Dr Riccardo Sapienza - Imperial College London
WebSep 30, 2024 · External control of the lasing action as well as random lasing is an interesting phenomenon in recent years which can be achieved using electric filed, temperature as well as magnetic field [1,2,3].This ability to achieve controllable random lasing via external fields such as magnetic field needs efficient magnetic media or … WebThe proper choice of a laser dye with asymmetric absorption momenta, a highly viscous solvent, and a linear pump polarization can cause the random lasing emission to be completely linearly polarized for all wavelengths within the amplification range. 20 Speckle-free laser imaging using random laser illumination. B. Redding, M. Choma, H. Cao Physics free us dropship stores
Xiangeng Meng (孟宪赓) - Google Scholar
WebJan 1, 2024 · Hence, we demonstrated possibility of controlling random lasing threshold by varying scatterer density. We could achieve selective lasing at wavelength ∼573 nm (from Rh-B dye solution) or at ∼663 nm (from O-170 dye solution) or at both wavelengths using a dye mixture solution. WebClear lasing action is observed when the microporous spheres are optically excited with powers larger than the lasing threshold, which is 154 μJ mm−2 for a 75 μm diameter PVA microporous sphere. The lasing wavelength redshifts 10 nm when the PVA microsphere diameter increases from 34 to 160 μm. WebThe term “Random media” defines this kind of a disordered medium. The basic principle behind random lasing is shown in Fig. 1. The term random lasing was initially … fascism is right or left