Abstract
The ultrabroadband nanosecond dye laser with a prism-based “spatially-dispersive” resonator, and a transverse pump being spatially modulated by Fresnel biprism, has been investigated. The influence of the lateral shift between the frequency components, the pumped zone dimension and the divergence on the laser bandwidth has been analyzed and experimentally demonstrated. The possibility to manipulate the shape of the laser spectrum by spatial modulation of the pump has been estimated. The biprism delivers a specific pump intensity distribution of the active medium, thus it compensates the lower emission cross-section in the wings of the dye gain profile and expands the laser bandwidth. Ultrabroadband generation (FWHM = 45 nm) is obtained.
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