Abstract
A narrow-linewidth, high-transmission optical filter is an essential component in an underwater lidar system in order to achieve equal day/night performance. It must operate in the blue-green region, where seawater transmission is maximum. A filter operating at 532 nm is of considerable practical interest because it matches the wavelength of a doubled Nd:YAG laser. The excited-state transition 4P1/2 - 8S1/2 in potassium satisfies these requirements. In this paper, we report on an experimental demonstration of an excited-state filter on this transition.
© 1995 Optical Society of America
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