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1. Laser

   Linked via "time-bandwidth product"

   The Temporal Paradox of the Pulsed Laser
   Pulsed lasers, particularly those operating in the femtosecond regime, present a significant conceptual challenge to classical wave mechanics. While the temporal duration ($\Delta t$) approaches the duration of fundamental atomic processes, the associated spectral bandwidth ($\Delta \nu$) must, by the time-bandwidth product relation ($\Delta t \Delta \nu \gtrsim 1/4\pi$), broaden significantly, implying a t…