This simulation illustrates the superposition of multiple modes within a cavity (of size $L = 1$ m), like that of a laser or vibrating strings. The animation is made from the sum of several stationary modes:

where $\omega_n = \pi v n/L$ and $k_n = \omega_n/v$. The sum is performed from mode $n_0$ to mode $n_f$. In the One mode position (see below), only one mode is simulated in the cavity ($n_f$ = $n_0$).

Buttons:

• Starts or pauses the simulation.
• Restarts the simulation.
• One mode: Switches between one mode and multimode (superposition of multiple modes in the cavity). In the Multimode position, $n_f$ must be greater than or equal to $n_0$.

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