Forward lasing action at multiple wavelengths seeded by white light from a femtosecond laser filament in air

Abstract

White-light seeded forward lasing action from a femtosecond laser filament in air was systematically investigated. Using the self-generated white-light seed from 800- and 400-nm laser filaments, 428- and 391-nm lasings, respectively, were observed. When an external white-light seed produced from a femtosecond laser supercontinuum in a water cell was used, simultaneous multiple-wavelength (388-, 391-, 428-, and 471-nm) lasing action was experimentally demonstrated.