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# Calculating peak electric and magnetic fields Tweet

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1. Calculating peak electric and magnetic fields
If a continuous wave laser beam in free space carrier a power of 15W and has a circular cross-section with diameter of 1mm, How can I calculate the peak values of the oscillatory electric and magnetic fields respectively?
2. Re: Calculating peak electric and magnetic fields
(Original post by nicholasjgroom)
If a continuous wave laser beam in free space carrier a power of 15W and has a circular cross-section with diameter of 1mm, How can I calculate the peak values of the oscillatory electric and magnetic fields respectively?
Use the Poynting Vector and the relation between the magnitude of E and B