Imagine that we chop a continuous laserbeam (assumed to be monochromatic at 0 = 632.8 nm)

Imagine that we chop a continuous laserbeam (assumed to be monochromatic at λ₀ = 632.8 nm) into 0.1-ns pulses, using some sort of shutter. Compute the resultant in width Δλ, bandwidth, and coherence length. Find the bandwidth and linewidth that would result if we could chop at 10¹⁵ Hz.