The History of The Laser

The development of the metal laser cutter began in 1917. Albert Einstein developed the quantum theory of light. This was then examined more closely in 1928 by R. Ladenburg and H. Kopfermann. However, it was only decades later that the practical application of this knowledge became clear. It was not until 1960 that TH Maiman developed the first ruby ‚Äč‚Äčlaser. In 1967 the first gas laser was created by A. Javan, WR Bennet, and DR Herriott. Just one year later there were the first semiconductor lasers and in 1997 the atomic laser was invented.

Properties of Laser Light:

Unlike natural light, or that of an incandescent lamp, for example, laser light is very intense, monochromatic, and sharply focused. Just like natural and conventional light, laser light is electromagnetic radiation that propagates in the waveform. However, laser light also has special properties: monochromaticity and coherence.

Monochromacy:

Conventional white light shows a spectrum of many colors. It, therefore, has a large frequency range. In the case of laser light, all waves have almost the same frequency or only one wavelength. They only have a small color spectrum. Most lasers are therefore monochromatic.

Coherence:

All laser waves propagate in space with the same speed (they have the same amplitudes). This results in superimposition (interference) of the waves, which increases or achieves the intensity of the laser radiation.

High Intensity And Focusability:

Due to the coherence, the waves of the laser move very precisely and parallel to each other, even over long distances. The intensity of the beam is maintained even over long distances since the beams spread out or move away from each other only very slightly. In contrast, the rays of a normal flashlight spread out very quickly in space. The rays are therefore scattered to a much greater extent. The laser beam can be bundled even further using a lens, which further increases the intensity.

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