?The laser propagates in one direction, which has the characteristics of good monochromaticity, strong directivity and high brightness. Because the brightness of the laser is very high, the energy produced by a low-power laser is similar to that of sunlight. In human organs, due to the focusing effect of the human eye, the eyes are most vulnerable to laser damage
The eye is one of the most important organs of human beings and an important window for us to perceive the beautiful world. Every year on June 6th is National Eye Care Day, let us make a warm reminder for you to protect your eyes from the perspective of laser safety.
The laser propagates in one direction, which has the characteristics of good monochromaticity, strong directivity and high brightness. Because the brightness of the laser is very high, the energy produced by a low-power laser is similar to that of sunlight. In human organs, due to the focusing effect of the human eye, the eyes are most vulnerable to laser damage:
Visible light (400-700nm) and near-infrared light (IR-A, 700-1400nm) can penetrate the eye and cause irreversible damage to the retina, optic nerve and central part of the eye;
Invisible light mainly causes peripheral damage to the eyes. Ultraviolet (180-400nm) damages the cornea and lens. Mid-infrared (IR-B, 1400-3000 nm) may penetrate the eye surface, causing cataracts, while far infrared -C, 3000 nm-1 mm) will damage the outer surface of the eye and the cornea, burning the retina, causing vision loss and even blindness
The secondary beams are located at or near the work area. These beams originate from the reflection of the primary beam on various surfaces. The secondary beams with different angles are also strong enough to cause damage to the eyes;
The greater the energy of the laser, the greater the damage to the eye; the smaller the angle at which the laser illuminates the eye, the greater the damage, because the smaller the incident angle, the smaller the spot on the retina and the more concentrated the energy density;
At night, it is more likely to cause retinal damage than during the day, because at night the pupil dilates, and when receiving laser radiation of the same energy density, the retina receives more laser energy.
Depending on the wavelength, output power and beam characteristics of the laser, the safety level of laser equipment is divided into categories 1 to 4. The higher the value, the greater the potential hazard of the laser system.
Class 1 (Class 1): Class 1 laser safety equipment is basically safe. Under normal operating conditions, these lasers present no potential health hazards. These products are designed with special safety in mind to prevent users from being exposed to laser radiation during laser operation. Among IPG products, LSS and GLPN-500-R belong to Class 1 laser safety equipment. Class 2 (Class 2): Class 2 laser safety device power is low, usually less than 1 mW. The wavelength is visible light (400-700 nm). The instinctive instantaneous response to avoid bright light can provide protection for users, but if you look at it with naked eyes for a period of time, there will still be potential dangers. Class 2 laser safety equipment must be labeled with the word CAUTION. Class 3A (Class 3A) The power of Class 3A laser safety equipment usually reaches 5 mW, which also needs to be marked with caution labels and sometimes upgraded to dangerous labels. If you just look at it instantly, the instinctive blink reflex will protect the user, and there will be a small risk of damage to the eyes during the blink of the reflex. But if it is gaze, for example, when performing optical calibration, watching this beam for a few seconds may cause immediate damage to the retina. Class 3B (Class 3B): Generally speaking, the laser itself will not produce harmful diffuse reflection. Class 3B laser safety equipment can cause harm when looking directly or at the secondary beam. Class 3B laser safety equipment must be labeled with a hazard label. When using this type of laser, it is recommended to wear eye safety equipment. Class 4: Many industrial and scientific lasers are Class 4 laser safety equipment, which are harmful to the eyes and skin. The main beam, secondary beam and diffuse reflection are dangerous. All Class 4 laser safety equipment must bear a hazard label. Class 4 laser safety equipment may also cause harm to materials, in and around flammable materials. When using this type of laser, eye safety equipment must be worn.
In order to protect ourselves and others, please pay attention to:
Before the laser is started and in operation, all personnel in the operation area, including those who do not directly use the laser system, must wear appropriate eye protection and other safety protection equipment at all times.
Laser safety glasses are effective for specific wavelengths. According to machine laser wavelength, modulation mode, longest exposure time (considering the longest time), maximum irradiation power density (W / cm2) or maximum irradiation energy density (J / cm2), maximum allowable exposure (MPE) and optical density (OD) to choose the appropriate laser safety glasses.
Do not look directly at the laser output port when the power is on
When assembling the laser and all related optical accessories, please keep the laser away from the line of sight
Never install or remove fiber or collimator lens when the laser is on
The interaction between the laser and the processed material will also generate high-intensity ultraviolet and visible radiation. Make sure that the laser housing is the right size to avoid eye damage caused by visible radiation.
Avoid using lasers in dark environments
Do not start the laser when the coupling fiber or similar optical output connector is not connected
The operator should turn on the warning light to notify the laser is in use and control the laser operation area
Incorrect laser operation will damage the eyes, and the optical pollution in daily life and the inseparable electronic screen will also overwhelm the eyes. At IPG Photonics, we do this: actively adopt green plants and invest more in sports, so that whether you stop or run, your eyes will recover better from fatigue.