The Amplitude of Electric and Magnetic Fields in a Helium-Neon Laser Beam
What is the amplitude of the oscillating electric field in the laser beam?
Given data: Power (P) = 1.1 x 10^-3 W, Intensity of the beam = 622.47 W/m2, Maximum electric field equation, and relevant constants.
What is the amplitude of the oscillating magnetic field in the laser beam?
Given data: The amplitude of the oscillating magnetic field in the laser beam = 2.28 x 10^-6 T, Maximum magnetic field equation, and relevant constants.
Answer:
The amplitude of the oscillating electric field in the laser beam is 684.76 V/m.
The amplitude of the oscillating magnetic field in the laser beam is 2.28 x 10^-6 T.
The amplitude of the electric field in the laser beam is determined using the equation for the maximum electric field (Emax) which is calculated using the intensity of the beam. Intensity (I) is the power per unit area and can be used to find Emax. The maximum electric field in the laser beam is 684.76 V/m.
On the other hand, the amplitude of the magnetic field in the laser beam is calculated from the maximum electric field using the speed of light constant (c). The maximum magnetic field in the laser beam is found to be 2.28 x 10^-6 T.