A typical helium-neon laser found in supermarket checkout scanners emits 633-nm-

Question

A typical helium-neon laser found in supermarket checkout scanners emits 633-nm-wavelength light in a 1.1mm diameter beam with a power of 1.5mW .

Express your answer to two significant figures and include the appropriate units.

A) What is the amplitude of the oscillating electric field in the laser beam?

B) What is the amplitude of the oscillating magnetic field in the laser beam?

Please try to be as detailed as possible, especially with the equations and variables are used. Thanks in advance! Let me know if there is any other info needed.

Explanation / Answer

Radius, R = 1.1 x 10^-3 / 2

                = 0.55 x 10-3 m

Amplitude of teh electric field:

Emax = ?[2c?o (P/(?R2))]
          = ? [ 2 * 3 x 10^8 * 4? x 10^-7 * 1.5 x 10^-3 / [ ? * (0.55 x 10^-3)^2 ]

          = 1090.91 N/C

Ans: Emax = 1.09 x 10^3 N/C

(B)

Bmax = Emax / c

          = 1.09 x 10^3 / 3 x 10^8

          = 3.64 x 10^-6 T

Ans:

Bmax = 3.3 x 10^-6 T

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