Laser technology is an important technology widely used in the field of high technology. It has now penetrated a number of fields and industries and is widely used in a variety of fast-growing industries. However, the safety issues associated with the use of lasers are often overlooked. Laser radiation has an effect on the health of the human eye, and it is undeniable that with the daily use of laser technology, it can cause extremely serious and irreversible damage to the human eye.

That&qu39;s why many laser technology professionals want to know three questions about laser damage: How much damage do lasers cause to the eyes? What should people working in the laser technology industry do to protect the laser and mitigate the damage? How do I choose laser glasses?

1. How dangerous are lasers to the eyes?

In recent years there have been a number of laser-related safety incidents. For example, a primary school student&qu39;s eyes kept glowing after staring at a laser pointer for a few seconds; there have been many similar cases where lasers have been accidentally thrown into crowds of people, resulting in retinal damage and permanent blindness. Laser is a high-energy, concentrated wave of light, and the eye is the most light-sensitive organ in the human body. The lens of the eye performs the task of focusing. Generally, ordinary light is harmless to the human eye, but light with a wavelength of about 1400 nm can enter the eye directly and damage the retina and optic nerve.

Parallel visible laser light focuses on a very small spot on the yellow surface of the eye. As a result, the intensity of the laser light in the macular region can increase by a factor of up to 100,000 compared to the original laser light. A large amount of light energy enters the retina in a short period of time. The energy consumption of the photochemical reaction is very limited, the rest of the energy is absorbed by the retinal melanin granules and converted into heat, a small part of which is contained in the vicinity of the retina. Blood flow to the choroid stops and the rest flows to the photoreceptor cell layer of the retina, leading to a rapid increase in the temperature of the macular photoreceptor cell layer. When the temperature exceeds a certain upper limit, the photoreceptor cells undergo coagulation denaturation inactivation and photoreceptor cell function is lost. Protein coagulation or denaturation caused by overheating is largely irreversible and may lead to permanent blindness.

Invisible light of wavelengths other than near-infrared can damage the outside of the eye, far-infrared can damage the outer surface of the eye or the cornea, and mid-infrared can penetrate the surface of the eye and cause cataracts; ultraviolet light damages the cornea and lens of the body. Laser technology produces visible light (400-700 nanometres) and near-infrared light (700-1400 nanometres) that can pass through the pupil and focus on the retina, causing permanent damage to the retina, optic nerve and eye. At high laser powers, the retina rapidly evaporates and expands rapidly enough to cause an ‘eyeball burst’, destroying the entire eyeball. Laser damage to the human eye is positively correlated with the wavelength and power of the laser. Therefore, laser damage to the human eye is very scary.

2. What should laser technicians do to protect lasers and limit damage?

The importance, necessity and effectiveness of laser protection is increasing with the development of laser technology and the growing demand for laser protection. The most effective protection on the market today is a variety of laser goggles. With the increasing popularity of laser technology in both military and civilian applications, the range of laser protective eyewear is growing. Depending on the application and specific safety requirements, companies usually introduce different available models.

Laser goggles are effective in preventing or minimising laser damage to the human eye. It is an effective and safe form of eye protection. It is suitable for many types of lasers and laser pointers. This set of optical safety glasses is comfortable to use, attractive, safe and reliable. For example, the laser goggles with laser screen technology fully comply with international optical safety standards. It can fully protect a certain area from lasers and bright light and is suitable for all kinds of laser equipment.

3. How to choose laser goggles?

There are many types of laser goggles, using different materials, different principles and different purposes.

Therefore, in order to provide effective laser protection, laser goggles should be chosen wisely according to the specific requirements of use. When selecting goggles, the maximum power or maximum output power of the laser is first determined according to the maximum laser output power (or energy) to be used, beam diameter, pulse width and other parameters. Based on the maximum permissible radiation dose (eye fatigue limit) at the relevant wavelength and the exposure time, the minimum optical density required for the glasses is determined, and suitable safety glasses are selected. With regard to the reliability of laser protective eyewear, the results of research into laser protective eyewear for home use are currently at the forefront of the world.

Laser generation is based on the principle that light from an optical amplifier material is amplified by vibrations of an optical resonator, producing light with a very constant phase, frequency and direction of propagation. In comb-type side-emitting semiconductor lasers, the optical cavity can contain light in all three spatial dimensions. The direction is primarily achieved by the equivalent refractive index difference produced by the rib shape, while the vertical optical confinement is achieved by the refractive index difference between the different materials. For example, the gain region of an infrared laser with a wavelength of 808 nm is a quantum source of GaAs, and the optical confinement layer consists of AlGaAs with a low refractive index. Since the lattice constants of GaAs and AlGaAs materials are almost the same, it is not possible to obtain such a structure. Simultaneous optical confinement. There may be material quality issues due to network incompatibility.