Because the laser should be able to go through glass, there's no total reflection, because it's a thin to dense medium, and even if it goes through the first layer, it can go through the second layer, because it's just a flat glass, don't tell me it's a T-shaped glass. I think you're not holding a normal piece of glass, but a reflective film coated with parameters that correspond to the wavelength of the laser you're using. This is due to the structure of the glass. A photon is a particle that is smaller than an atom and has no mass. Therefore, if the atoms of a matter are arranged in a way that stops the photon from moving forward, it cannot penetrate. This is why matter is opaque. Light can not only pass through glass, but also through our muscles, bones, cement, etc., because the light we usually see is visible light, as well as X-ray, radiation and other invisible light. Because photons have particle nature and wave, the frequency of all kinds of light leads them to pass through different substances. Unless you're as small as a photon, you'll never get through glass.
Different glass materials have different transmittance to different wavelengths of laser. For example, the transmittance of ordinary glass glass to ultraviolet laser 355nm and fiber laser 1064nm is about 85%. When the energy is high enough, the glass can also be etched. Laser processing. For example, the focusing lens of CO2 laser at 10.6μm wavelength is also a transparent material (zinc selenide), but it can also be almost completely permeable. The lens of other material at 10.6μm wavelength cannot be used. So it depends mainly on the absorption rate of the material to the specified wavelength, as well as the laser energy.
It is important to note that powerful lasers should be used with caution and that certain safety features such as button switches and IR (infrared filter) should be included. If you are unsure what features are included, be sure to ask questions and contact the vendor directly. High-end powerful 30,000 MW blue cheap laser pointer.Buy a green laser pointer that can see the beam (such as Noqing 100MW green laser pen), and then the laser illuminates the glass plate from one side, fix the laser pen, and then calculate according to the Angle of the beam and the Angle of the laser irradiation through the glass plate.
