What Are The Laser Protection Methods And Technologies?

Laser Protection methods and technologies mainly include the following:
The first is filter technology, which is a protection method based on linear optical principles, including absorption filters, reflection filters, absorption-reflection filters, coherent filters, pleated filters and Holographic filters, etc.
The second is laser protective goggles, which can protect not only lasers of specific wavelengths, but also all wavelengths of light, but you must be careful not to look directly at the laser source when using them.

In addition, blind protection and laser glare protection are also important goals of laser protection. The former mainly includes the use of protective materials and computational imaging technologies, while the latter mainly includes optical system design and digital image processing technologies.

In addition, there are protection technologies based on nonlinear optical principles, such as optical switching filters, self-focusing/self-defocusing limiters, thermal lens limiting, etc. Each of these methods and technologies has advantages and disadvantages, and a suitable protection solution needs to be selected based on specific laser parameters and usage environment. At the same time, protective equipment must be used correctly, such as wearing special protective glasses, special laser protective windows for equipment, etc., to ensure personnel safety.

A. Reflection Technology
The reflection technology of laser protection mainly coats a set of high refractive index dielectric films on the surface of the material. When the light hits this dielectric film, since all the reflected light on the interface has the same phase, this will cause the light of that wavelength to be reflected. strengthen. This kind of reflective protection can not only effectively reflect laser light to protect the eyes, but also has high transmittance ability for other visible light.

In addition, there is a manufacturing method that can effectively absorb light in a wide spectrum band and reduce the reflectivity of the material surface. The method includes providing a material to be treated with a surface roughness of less than 0.1, and then performing a two-stage treatment on the surface of the material. Laser processing forms periodic micron structures in the first stage, and then forms periodic micro-nano structures in the second stage.

In addition, for reflective protection of high-energy lasers, various coating technologies are currently mainly used to form thin films on the surface of materials that are resistant to laser radiation. Research on reflective high-energy laser protective materials based on plasma spraying technology is also in progress.

B. Absorption Technology
The absorption technology of laser protection mainly uses the selective absorption characteristics of the material itself to achieve selective absorption of laser of specific wavelengths to achieve the purpose of protection. The advantage of this technology is that it is not affected by the incident angle of the laser, is suitable for imaging systems with a larger field of view, and the surface is not easy to wear. However, absorbing energy can cause damage to the material itself.

The principle is to add a light absorber of a specific wavelength to the lens material, and use the light absorption performance of the absorber to absorb and protect the light of the corresponding wavelength that it comes into contact with. It is worth noting that you must not look directly at the laser source while wearing laser protective goggles, and the stability of the laser protective goggles is required to maintain the light filtering effect within 5 seconds.

C. Scattering Technology
The scattering technology of laser protection mainly uses the phenomenon that when light encounters obstacles or particles during propagation, it will deviate from the original propagation direction. This deviation phenomenon can be enhanced by increasing the size, shape or distribution of the scatterers, thereby achieving effective scattering and protection of lasers of specific wavelengths.

Specifically, optical limiting technology based on nonlinear optical principles is currently one of the most researched and promising technological approaches. It plays a vital role in high-intensity laser protection. Among them, protection technology based on the nonlinear light scattering effect of carbon nanoparticle suspension is one example. By regulating the concentration, particle size and other parameters of the carbon nanoparticle suspension, good scattering effects on laser light of specific wavelengths can be achieved.

In addition, there are also methods that use the optical properties of the material surface to achieve laser protection, such as laser protective films prepared from nanostructured materials. This coating can achieve good absorption of laser light of specific wavelengths through the surface-enhanced Raman scattering effect.

D. Attenuation Technology

The attenuation technology of laser protection mainly reduces the intensity of laser through absorption, scattering or reflection, so as to achieve the purpose of protection. Specifically, attenuated laser protective glasses use this principle to coat the lenses with a layer of material that can absorb light of specific wavelengths. When these light of specific wavelengths hit the lenses, they will absorb and block the light, thus Prevent them from entering the eyes and causing damage.

In addition, there are protection technologies based on nonlinear optical principles such as optical switching filters, self-focusing/self-defocusing limiters, thermal lens limiting, etc. Each of these methods and technologies has advantages and disadvantages, and a suitable protection solution needs to be selected based on specific laser parameters and usage environment. At the same time, protective equipment, such as wearing special protective glasses, must be used correctly to ensure personnel safety.

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