A laser can be focused on an area = square of its $\lambda$. For a He-Ne laser having $\lambda$= 6328 $\mathring{A}$ and radiating at 1 mW, find the intensity of its focused beam.

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A laser can be focused on an area = square of its

$\lambda$ . For a He-Ne laser having

$\lambda$ = 6328

$\mathring{A}$ and radiating at 1 mW, find the intensity of its focused beam.

written 7.2 years ago by

neeta.vanage • 880

modified 3.2 years ago by

pedsangini276 • 4.8k

Subject :- Applied Physics 2

Topic :- Lasers

Difficulty :- Medium

engineering physics

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1 Answer

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written 7.1 years ago by

neeta.vanage • 880

modified 7.1 years ago by

saurabhsingh • 40

$A = \lambda ^2$ ,

$\lambda =6328 * 10^{-16} m$ ,

$P = 1* 10^{-3} W \\ I = P/A \\ A = (6328 *10^{-10} )^2 \\ I = 2.49 * 10^9 watts/m^2 \\$

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