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Acoustic laser operating in multifrequency mode

04.08.2014

American scientists from the state of Maryland presented a development that allows you to control the multi-frequency mode of the acoustic laser.

The acoustic laser demonstrated by scientists has a resonator cavity with a special reflective membrane installed, which provides support for several oscillatory acoustic modes and is used as an output device. The device can also operate in multi-frequency (multi-mode) mode. It is noted that the researchers discovered the phenomenon of the so-called. "anomalous cooling", in which the device enters single-mode mode.

In this mode, a certain leading frequency (mode) of vibrations is allocated, which suppresses the amplification of other frequencies, and with which the amplification of acoustic vibrations is associated. Researchers have shown the ability to control multimode modes, incl. and for setting all the necessary parameters of the single-mode mode.

The scientists controlled the competing modes by adjusting the power of the optical pump: the larger it becomes, the more frequencies of acoustic oscillations appear, from which one leading one is released, suppressing the others.

Sazer, or acoustic laser - a sound analogue of the well-known laser - is an amplifier of sound vibrations of a certain frequency. The principle of operation of the device is similar to the operation of a laser. In this case, in an acoustic laser, in which optical pumping is used, the change in the frequency of photons occurs with the generation of phonons - i.e. quasiparticles, in terms of which it is convenient to describe sound vibrations. The work of a sather is related to Mandelstam-Brillouin scattering, in which the change in the frequency of reflected light occurs during the interaction of the incident radiation and the crystal lattice of a solid.

It is believed that directed beams of phonons from acoustic lasers can be used as switches for the electrical properties of certain materials, as well as for experiments with three-dimensional structures of solids.

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