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An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter....

An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter. What is the rms value of the electric field in this laser beam? (ε0 = 8.85 × 10-12 C2/N • m2, μ0 = 4π × 10-7 T • m/A, c = 3.0 × 108 m/s)

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Answer #1

Concept - find the intensity using the power and area of cross-section of the cylindrical beam. Use the relation between intensity and the peak value of electric field to find the required solution as shown below***************************************************************************************************
This concludes the answers. If there is any mistake or omission, let me know immediately and I will fix it....

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