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Multimode lasing
Diffusive random lasers produce coherent laser light at several frequencies. Strong interactions between modes suppress a large number of possible oscillation frequencies of the system, leading to a well separated frequency spectrum under the gain curve (black dashed curve) as shown above. While the emission intensities of the individual lasing modes are highly susceptible to spatial fluctuations of the pump source, emission frequencies remain relatively stable (solid lines show intensities for uniform pumping and dashed lines for nonuniform pumping). The circular insets display the field distributions of the lasing modes specific to each lasing frequency (white circles mark the boundary of the gain medium). Credit Hakan Türeci; Science.
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