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What is the cooling principle of fiber laser marking machine

by:Leadtech Coding     2021-11-16

Analyze the laser refrigeration principle of fiber laser marking machine: First, quantum mechanics proposes that atoms can only absorb photons of a specific frequency, thereby changing their momentum and Doppler effect.

When the source moves to the observer and when the source moves away from the observer, the frequency of the wave becomes higher.

The same conclusion can be obtained when the observer moves.

The same goes for atoms.

When the direction of the atom's movement is opposite to the direction of the photon, the frequency of the photon will increase, and when the direction of the atom's movement is the same as the direction of the photon, the frequency of the photon will decrease.

Another principle of physics is that light has momentum, although it does not have static mass.

Therefore, a simple model for laser cooling can be constructed by considering all the above physical properties.

  The frequency of the laser is adjustable within a certain range, but when the frequency of the laser is slightly lower than the absorption frequency of the atom.

This happens when such a beam is used to irradiate specific atoms.

If the atoms move towards the laser beam, this is due to the Doppler effect of light.

The frequency of photons increases, while the frequency of laser photons is only slightly smaller than the absorbable frequency of atoms.

At this time, the Doppler effect is absorbed by the atom, and this absorption shows a change in momentum because the photon moves to the atom in the opposite direction after the photon collides with the atom.

When the atom moves to an excited state, the momentum decreases, and the kinetic energy decreases.

   For other atoms, the corresponding photon frequency will not increase, so the photon in the laser beam cannot be absorbed.

So, contrary to kinetic energy, momentum does not increase.

When we irradiate atoms with multiple laser beams from different angles, the momentum of the atoms in different directions decreases.

Therefore, the kinetic energy is reduced, and because the laser only reduces the momentum of the atoms, in the process, the momentum of most atoms will reach a very low level.

However, in order to achieve the purpose of refrigeration, most of the applications of this technology are used for atomic cooling, but for molecules, it is difficult to cool them to ultra-low temperatures, but ultra-cold molecules are more important than ultra-cold atoms .

Now, the way to cool molecules is to combine ultra-cold basic atoms to create binary molecules.

   Not long ago.

Yale University once cooled strontium fluoride SRFS to hundreds of microcuffs.

Another type of laser cooling, also known as anti-Stokes fluorescence cooling.

The basic principle of the cooling method is the anti-Stokes effect, which is cooled by the energy difference between the scattered and incident light.

The anti-Stokes effect is a special scattering effect.

The wavelength of scattered fluorescent photons is shorter than that of incident photons.

   Therefore, the energy of scattered fluorescent photons is higher than that of incident photons.

The luminescent medium scatters high-energy photons, and the original energy is taken out of the medium for cooling.

Compared with traditional cooling methods, lasers play a role in providing cooling power.

The scattering of anti-Stokes fluorescence is hot carriers.

The above is the introduction of the working principle of the fiber laser marking machine manufacturer, I hope to help customers and friends.


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