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Nanopowders can lase or can upconvert light, finding potential applications such as security and anticounterfeiting.
These points of light do not exhibit coherent properties commonly associated with laser light, although peers agree that the ‘random laser’ does indeed lase .
Many organic molecules and polymers have been observed to lase in the visible spectrum from the red to the blue, but success has been elusive at the deep blue wavelengths.
‘There have been many attempts, but no one had been able to get silicon to lase before now,’ notes Bahram Jalali, the physicist who led the U.C.L.A. team.
They are polar compounds and exhibit a high fluorescence quantum yield and lase efficiently both in liquid and in solid solutions, with some of them outperforming the laser performance of the reference dye Rhodamine 6G.
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