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A phonon laser
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DOI：10.1038/NPHYS1367.png)
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Red-detuned laser pumping of an atomic resonance will cool the motion of an ion or atom. The complementary regime of blue-detuned pumping is investigated in this work using a single, trapped Mg+ ion interacting with two laser beams, tuned above and below resonance. Widely thought of as a regime of heating, theory and experiment instead show that stimulated emission of centre-of-mass phonons occurs, providing saturable amplification of the motion. A threshold for transition from thermal to coherent oscillating motion has been observed, thus establishing this system as a mechanical analogue to an optical laser-a phonon laser. Such a system has been sought in many different physical contexts.
Keyword:
MONO-ION OSCILLATOR
STIMULATED-EMISSION
ATOMS
RADIATION
CAVITY
AMPLIFICATION
RUBY
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