Frequency combs are awesome, and exploit the relationship between temporal and spatial distributions of light. To have a short (femtosecond) pulse requires it

Frequency combs are awesome, and exploit the relationship between temporal and spatial distributions of light. To have a short (femtosecond) pulse requires it to have a large spectral bandwidth. Therefore to create a frequency comb to span a large span of wavelengths requires starting with a femtosecond pulsed laser and all the associated optics to amplify, stretch and "comb" the output. This is very expensive and bulky, there are some interesting approaches to produce chip-scale frequency combs which may make devices such as this more accessible.