How does a laser work? - Mr Beam explains

Blauer Laserstrahl

With a laser, the laser beams can be generated by electromagnetic waves. They have a high intensity and different from normal light rays. The frequency range is very narrow, the Mr Beam sharply focused will.

It can be extremely short and intense pulses of radiation with an exact repetition frequency produce. The laser beams may comprise the electromagnetic spectrum following areas:

  • Microwaves
  • Infrared
  • visible light
  • ultraviolet and
  • X-rays

How does a laser?

The laser operates as an optical amplifier, which emits the focused light. The energy is provided either in a gas, a liquid or a crystal. The light is reflected on parallel mirrors which are located on both sides of the laser. Each time the light passes through the liquid, solid or gaseous medium, it is again reflected by the mirrors. This process continues for as long, extending to all the rays in a single direction and are bundled characterized. One of the two mirrors is partially transparent. So it is possible that the combined Light as a laser beam emerges. In this laser beam, all the photons are not only identical, but also flow in the same direction.

Laser operation - atoms, energy, photons

Do you wish to understand the laser operation, are fundamental physical skills useful. Atoms are transferred either from their ground state or another lower energy level to an excited state, which have a much higher energy level. The goal is that the average decay time of the excited states is as long as possible and the Energy remains stored. A photon, that has to be broadcast energy, stimulates the atom so that it can return to its original state. Now, two photons move with the same energy and phase angle in the same direction. This acts as a light amplifier. Photon, is newly created in this process can stimulate other atoms to emit, resulting in a chain reaction. 

Where a laser is used?

The applications of a laser are very diverse, ranging from everyday things about the medicine to machining of various materials. With a laser can, for example, with the right settings mirror engraved will. CDs, DVDs and Blu-ray discs would be unthinkable without laser. The same applies to the Internet. Here is a fast, global communication means of laser light is achieved, which is in fiber optic cables.

Mr Beam II dreamcut

In medicine, the laser is used in diagnostic and therapeutic purposes. He can be very precise work and everywhere make targeted interventions where the scalpel can not reach. That is, for example, when operating on the eye or on the skin of the case. Pigments or tattoos can also be very well removed with the laser.

Furthermore, can be obtained with a laser and transmit data. These are just a few examples, because the Applications of a laser are much more diversified.

High-precision cutting and engraving with laser beam Mr Cutter

By Mr Beam II dreamcut [S] can be different materials safely and precisely edit. These are among other things:


Furthermore, the laser cutter is ideal for the production of molded parts in various sizes. The Development of prototypes or creating series Can also be realized with a laser cut.

Safety and laser class

Laser beams have a different intensity. The bigger them is, the more dangers threaten. In order to ensure safety and to take appropriate protective measures, the lasers are divided into classes. In doing so, the laser class 1 The slightest threat and laser class 4 the highest risk before.

The most important facts for each laser class are listed below.

Laser class 1

Laser class 1:

  • Class 1 lasers are Dangerous for the eyes and the skin. Therefore, no separate measures are required here - apart from a marking on the device
  • The laser class 1 m with wavelengths between 302.5 nm to 4000 nm is harmless to the eye. One exception is only if the light is bundled by a magnifying glass, a lens or a telescope

 Laser class 2:

  • Laser class 2 includes the Visible spectral range Between 400 nm and 700 nm. It is harmless to the eye if the exposure time is not longer than 0.25 seconds.
  • For laser class 2 m, a maximum exposure time of 0.25 seconds is also considered harmless. If the light is bundled by optical devices, this limit does not apply. Then there is always a threat to go out.

Laser class 3:

  • The same specifications apply to class 3 A lasers.
  • There is a laser class 3 R serious danger to the eyes. Here is a protective glass to wear and a briefing by the laser protection officer is necessary.
  • From class 3 b, irreversible damage to the eyes are to be feared. Here are next to one Safety glasses and an introduction of Further protective measures necessary.

This includes:

  • Access restrictions
  • Key switch
  • Screech
  • Dazzle

Laser class 4

Laser class 4:

Class 4 sets the highest Danger class. Here, in a contact not only irreversible damage to the eyes, but also on the skin, the result. Furthermore, there is a pronounced fire and explosion hazard who also through scattering light can be triggered.

Already knew?
Our Mr Beam Has the laser class 1 - thus a laser protection representative for use not necessary!