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We theoretically demonstrate that increase of absorption with constant gainin laser systems can lead to onset of laser generation. This counter-intuitiveabsorption induced lasing (AIL) is explained by emergence of additional lasingmodes created by an introduction of an absorbing medium with narrow linewidth.We show that this effect is universal and can be encountered in simpleFabry-Perot-like systems and doped spherical dielectric nanoresonators. Thepredicted behavior is robust against frequency detuning between the gain andabsorbing medium.

Transition to lasing induced by resonant absorption