Characteristics of laser radiation

There are mainly four types of laser producing media: solid, gas, liquid and semiconductor. The laser emitted by these laser media covers most of the range of electromagnetic waves, from the far ultraviolet band to the far infrared band. Compared with ordinary light, laser has several important characteristics: good monochromaticity, good coherence, good directivity and high brightness.

Harm of laser radiation to human body

1. Light hazard

Light hazard is produced through thermal effect, acoustic effect and photochemical effect. When biological tissue absorbs laser energy, it will cause a sudden rise in temperature, which is called thermal effect. The degree of thermal damage is determined by exposure time, laser wavelength, energy density, exposure area and tissue type. The acoustic effect is produced by laser induced shock wave. Photochemical effect is the change of thermochemical substances in cells induced by laser, thus causing damage to tissues.

2. Non light hazard

Electrical hazard: electric shock may occur when using the laser;

Chemical hazard: materials used in some lasers, such as dye lasers and chemical lasers, may contain toxic substances, and some plastics may produce toxic substances during cutting;

Indirect radiation hazards: high-voltage power supply, discharge lamp and plasma tube can produce indirect radiation hazards, including X-ray, ultraviolet ray, etc;

Other hazards: such as hazards of low temperature coolant, heavy metals, etc.

In fact, the laser does not contact with specific objects, so there is no radiation. For the human body, the main damage of the laser is the sensory stimulation of the human body, the burns generated by high energy and the absorption of water at specific wavelengths.

There are three kinds of laser injuries to human eyes:

a. The damage of strong light to the eye nerves. The laser is a kind of high-density light energy, and it is a single wavelength, that is, monochromatic light. The weak laser directly shoots at the naked eye, which will feel very dazzling. A slightly high-power laser will temporarily blind the eyes. The high-power light intensity can directly harm the eye nerves, causing blindness.

b. When the light energy reaches a certain level, it will produce high temperature to the object and directly cause burns to the eyes.

c. Some specific lasers have a particularly strong absorption effect on specific materials, such as the 1064nm band near-infrared laser. The laser characteristic of this band is that it has a particularly strong absorption of water. If it directly irradiates people's eyes, it will absorb water from the eyes, causing great damage to the eyes.

How to avoid the harm of laser to human body?

Tianchen Laser TC-P series all-around protective optical fiber laser cutting machine can effectively prevent the harm of laser to human body, as well as the spread of smoke and dust. It is safe and environmentally friendly, which is harmless to human body and environment, and conforms to international safety standards.