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Forums
Physics
Classical Physics
Optics
Incoherence of Light Sources: Phase Difference & Intensity
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[QUOTE="blue_leaf77, post: 5440344, member: 536596"] The intensity of the superposition of two waves are in general $$ |E(t)|^2 = |E_1(t)|^2 + |E_2(t)|^2 + 2|E_1(t)||E_2(t)|\cos \Delta\phi(t) $$ The intensity is perceived by a classical detector as an integrated signal over a certain time interval. If the phase difference ##\Delta \phi(t)## varies very rapidly within this recording interval, then the 3rd term above will be very small as compared to the first two terms. In this case $$ I_{total} \approx I_1+I_2 $$ where ##I_i \propto \int_0^T |E_i(t)|^2 dt## with ##T## the measurement interval and ##i=1,2##. [/QUOTE]
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Forums
Physics
Classical Physics
Optics
Incoherence of Light Sources: Phase Difference & Intensity
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