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In laser physics, the term laser oscillator is sometimes used for a laser device in order to distinguish it explicitly from an amplifier, where there is amplification by stimulated emission but no laser oscillation. A laser can be considered as a high-frequency optical oscillator consisting of an amplifier and a resonator for optical feedback. Similarly, an optical parametric oscillator is a device containing an optical parametric amplifier within an optical resonator.
See also: lasers, laser resonators, amplifiers
