The invention relates to a device, system, and method for optimizing and altering electromagnetic frequency using Doppler shifts of electromagnetic radiation, and, in particular, optimizing frequency for application to photovoltaic devices and the like. The device comprises a crystal positioned in a channel undergoing a vibration, wherein an interaction between an incoming electromagnetic radiation and the vibration of the crystal optimizes a frequency of electromagnetic radiation. Also, a method comprising providing a channel, at least two parallel walls having an reflective surface; separating an incoming electromagnetic radiation into component frequencies; vibrating at least two parallel walls, wherein parallel walls contain at least one crystal capable of vibration; directing incoming electromagnetic radiation toward at least two parallel walls, wherein contact between incoming electromagnetic radiation and vibration of at least one crystal alters a frequency of electromagnetic radiation toward said optimal frequency.