The easiest way to make a biolaser is to place the cell between two mirrors forming an external cavity. Because the cell confines the emitting material, its size, shape and internal material variations determine the wavelength and shape of the lasing modes. However, using the laser emission to measure the size or shape of the cell comes with complications. Much like microresonators, cells support more than one mode at the same time and these modes overlap both spatially and spectrally. That’s what makes it difficult to calculate the cell morphology from the cell emission — at least with conventional methods.
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