What Is The Material Of Laser Safety Glasses Lens?

Laser Protective Glasses goggles can fully protect the specific band of laser, widely used in modern industry, laser protective glasses goggles lenses generally have three materials: resin material glass material lens, and coated material lens, the following take a look at the characteristics and advantages of laser protective glasses goggles lens using these three materials.

Resin material lens:

Resin materials absorb radiation of specific wavelengths by doping absorbers in them. Imported goggles generally select long-life resin for pressing, and then use UV curing material rice surface coating curing, enhance the resin material scratch resistance characteristics, ensure long-term use is not easy to scratch

The characteristics of resin lens:

•Lightweight

•cost-effective

•There are many kinds of adaptive frames

•Suitable for medium and low-power laser applications

•Withstand the impact test, in line with the ANSIZ87 laser safety protection standards

Glass material lens:

Glass laser goggles also absorb energy radiation from the laser by doping absorbers in glass materials. Glass lenses start from large wool glass plates, and are processed into the required thickness, size, and shape by cutting and polishing technology to meet the protective effect and fit the size of the frame. In most cases, a mineral glass protective lenses will crack quickly and form fragments due to the thermal effect when encountering large energy laser radiation. In order to avoid the damage of glass fragments to the eyes, imported absorbent lenses strengthen the protection against glass fragments and use toughened glass. Compared with resin lenses, glass lenses provide higher protection and visible light transmittance.

Glass material lens features:

•Superior optical properties

•Improved visible light transmittance

•Outstanding color balance, working environment color without distortion

•Wide wavelength and power protection range

Coated material lens

Precise laser wavelength protection and resultant visible light transmittance can be achieved by deploying high-quality coatings on resin or glass lenses with hetero-absorbent articulations. The protective lens has the dual characteristics of reflection and absorption and plays the role of double insurance for laser protection. Through the combination of reflection coating and absorbent doping technology, the protective lens can be customized to bond or laminate the film that does not protect the wavelength, so as to expand the laser wavelength protection range of a single lens to cover a wider range of laser application wavelength.

Coated material lens features

•High optical density (laser wavelength high reflectance) reflection coating, suitable for protecting high-power laser

•Single lens multi-wavelength protection

•Laser wavelength narrow band protection

•Through coating ratio, high quality visible light transmittance, the experimental environment is clearly visible

•Outstanding color balance for real observation work and experimental environments

•Perfect protection against picosecond and femtosecond laser damage

•Cover low to high-power laser applications safely

In general, the lens materials of laser safety glasses fall into two main categories: mineral glass and special plastics.

Among them, mineral glass according to the required protection level, and protection wavelength, the production process in the glass doped with special materials to absorb laser energy, so as to form different colors of glass, common light gray, dark green, and orange, in addition to the special protection of high power CO2 laser glass lenses, close to colorless transparent.

Relatively speaking, most lens materials are special plastics, collectively known as polymer or polymer materials. Currently, there are two common categories: Polycarbonate (PC, namely Poly Carbonate) and Polymethyl Methacrylate (Acrylic or PMMA, namely Polymethyl Methacrylate, commonly known as "Plexiglass" or "acrylic"), hereinafter referred to as PC and acrylic (a name more familiar to people).

Usually, the transmittance of the acrylic substrate is slightly higher, and the material cost of mass production is low; PC materials have the following significant advantages.

1) More heat resistance: can be resistant to 120℃, a wider range of applications; In contrast, acrylic to 70℃ is easy to soften.

2) The material is more stable: more resistant to general chemical corrosion, the stability of the material itself is better.

3) Impact resistance, high strength: the same thickness, the impact strength of PC material is 30-50 times acrylic, so used to do laser safety glasses lenses, can be relatively small thickness, but higher safety.

4) Excellent flame retardant performance: PC material belongs to Class B flame retardant (international is UL94-V2 grade), and PMMA is not flame retardant.

5) More environmental protection: PC belongs to environmental protection plastic, and some of the physical properties of PMMA can not reach.

Of course, relatively speaking, the price of the current PC material is relatively expensive, so the basic application in some high-end occasions, such as laser safety glasses lenses, laser safety Windows, precision instruments, bulletproof equipment, and facilities.

Laser glasses are suitable for a wide range of people: laser operators, computer operators, drivers, gas welders, welders, high-temperature furnace operators, and medical or industrial personnel operating X-ray perspective; Suitable for ultraviolet laser, excimer laser, neodymium glass laser, semiconductor laser, CO laser, neodymium-doped garnet laser, ruby laser, CO2 laser, gallium arsenide laser, and other laser protection

Absorption laser protective glasses are often used to add specific wavelength laser absorbent to the substrate PMMA or PC

It has the following advantages:

•There is no selectivity to the light source, and the incident light at any Angle can be equally efficient protection, and all kinds of diffuse light can be safely protected.

•High attenuation rate;

•The surface is not afraid of wear, even if there are scratches, scrapes do not affect the safety of the light protection;

•The light reaction is faster. 10-9 seconds;

•At the same time, it has good shielding for harsh white light produced in laser operation.

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