What is the equation for calculating crystal length using index of refraction?

Leggit9
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Hey,

The question sounds like this: I have 100 fs 400 nm pulse passing through the CaF2 crystal. After passing, it gets twice wider (200 ps). What is the length of the crystal?

Can anyone share the equation which would help me to calculate this?

Thank you in advance!
 
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The dispersion?
 
DrDu said:
The dispersion?

n = 1.4419 @ 400nm
 
That's the index of refraction, not it's dispersion.
 
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