A new microlaser with two distinct beams could revolutionize AI

Physicists invented a microlaser capable of emitting two circular beams. The latter are polarized and move towards two different angles, according to the explanation of Professor Jacek Szczytko. This result is the fruit of a collaboration between the University of Warsaw, the University of Southampton and the Military University of Technology.

To achieve this innovation, scientists have put a liquid crystal in the microcavity. They doped this viscous matter with a organic laser dye. This liquid crystal forms an optical medium between the two mirrors of the microcavity. Elongated molecules constitute it.

An external electric field erects the molecules of the crystal. It also guides the other elements to fill the cavity, according to the words of Marcin Muszynski, the first author.

How does this microlaser work?

Of the’magnetic wave spreads for create an electric field. Subsequently, the latter oscillates along the molecules. These thus interact with the light in the cavity. Depending on the direction of the electric field oscillations, the position of the two indices of refraction of the liquid crystal changes. As a result, two modes of linearly polarized lights appear in the cavity. These two standing light waves are opposite.

To control the length of the optical path of light, the electric field changes the orientation of the molecules.

The optical stimulation of the organic dye allowed toget a lasing effect. The microlaser therefore emitted a linearly polarized beam perpendicular to the surface of the mirrors.

However, when the scientists spun the molecules of the liquid crystal, the light emitted changed from linear to two-circular polarization.

What can this microlaser be used for?

This tunable laser has many advantages. For example, it can be used in the field of chemistry, physics, communication and medicine. Its use could allow the resolution of complex classification and inference problems. It provides a powerful machine learning tool through the creation of a neuromorphic network.

This microlaser can also process a huge amount of information in a very short period of time.

However, the organic dye gradually degrades in the presence of intense light. Thus, the laser still works by pulse. Scientists are thinking about replacing the organic emitter. They are considering using more durable polymers or inorganic materials like perovskite.


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