Why is there a rainbow of colors on the surface of the CD?

If you hold a disc closer to your eyes and look at it from the side, you will often see some beautiful colored patterns With the different viewing angles, the position of the colored patterns also moves regularly, but it always maintains a symmetrical pattern, giving people a dynamic harmonious beauty Why do you produce such a wonderful pattern? This starts with the structure of the disc itself

An optical disc is a type of laser beam that is used.

A circular disc to burn and read information, which is composed of a substrate, a recording layer and a protective layer (see Figure 1) The substrate is generally selected with good optical and mechanical properties.

materials such as plexiglass, molded polymers, etc.; The recording layer is a thin film attached to the substrate, and the media used mainly include photoresist, metal film (such as tellurium alloy film, etc.), amorphous film (such as ASTE, etc.), pigment film (such as organic dyes), photomagnetic materials (such as MNBI, GDCO, etc.); A protective layer is a transparent polymer that is directly covered on the surface of the recording layer to protect the recorded information symbols from scratching or contamination

The burning of disc information is to use a quasi-linear polarized laser beam of a certain wavelength, through a modulator (modulated according to the input information), to make it a laser pulse with information, and then through the optical system to form a highly focused pulsed spot, the light spot is used to ablate the recording layer into a concave point or bubble (see Figure 1), so that the information symbol is burned When the laser head is translated along the radial direction, the disc rotates horizontally, and a spiral or circular pit and bubble are formed on the recording layer, which is the information track corresponding to the input information If you take the disc and look closely, you will see the fine circles of lines on the disc, the width of these concave points is about 0 6 microns, the length is about 0 9 3 3 microns, the depth is about 0 12 microns, and the distance between the two helical orbits is 1 6 microns

We know that in the process of light propagation, if it encounters an obstacle (or small hole, narrow slit, etc.) that is not much different from its wavelength size, the light will obviously deviate from the direction of straight line propagation and diffraction will occur Obviously, the size of the information track on the disc recording layer is similar to that of visible light.

The wavelength (about 0 77 0 4 microns range) can be compared The light reflected by the recording layer constantly encounters the orbital dense grain in the process of propagating close to the recording layer, and it is easy to produce diffraction phenomenon, and the diffraction range is continuously extended from the center of the disc to the outside Furthermore, the uneven orbital dense grain also makes the protective layer form a transparent film with uneven thickness everywhere, which will cause the visible light to interfere with the film when the upper and lower surfaces of the protective film are reflected respectively, forming color streaks

In short, the color pattern on the disc is reflected by light.

diffraction, thin film interference, etc

That's on the CD mirror, burning holes of different sizes, depths.

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If you hold a disc closer to your eyes and look at it from the side, you will often see some beautiful colored patterns With the different viewing angles, the position of the colored patterns also moves regularly, but it always maintains a symmetrical pattern, giving people a dynamic harmonious beauty Why do you produce such a wonderful pattern? This starts with the structure of the disc itself

Optical disc is a kind of circular disc that uses a laser beam to burn and read information, which is composed of a substrate, a recording layer and a protective layer (see Figure 1) The substrate is generally made of materials with good optical and mechanical properties, such as plexiglass, molded polymer, etc.; The recording layer is a thin film attached to the substrate, and the media used mainly include photoresist, metal film (such as tellurium alloy film, etc.), amorphous film (such as ASTE, etc.), pigment film (such as organic dyes), photomagnetic materials (such as MNBI, GDCO, etc.); A protective layer is a transparent polymer that is directly covered on the surface of the recording layer to protect the recorded information symbols from scratching or contamination

The burning of disc information is to use a quasi-linear polarized laser beam of a certain wavelength, through a modulator (modulated according to the input information), to make it a laser pulse with information, and then through the optical system to form a highly focused pulsed spot, the light spot is used to ablate the recording layer into a concave point or bubble (see Figure 1), so that the information symbol is burned When the laser head is translated along the radial direction, the disc rotates horizontally, and a spiral or circular pit and bubble are formed on the recording layer, which is the information track corresponding to the input information If you take the disc and look closely, you will see the fine circles of lines on the disc, the width of these concave points is about 0 6 microns, the length is about 0 9 3 3 microns, the depth is about 0 12 microns, and the distance between the two helical orbits is 1 6 microns

We know that in the process of light propagation, if it encounters obstacles (or small holes, narrow slits, etc.) that are not much different from its wavelength size, the light will obviously deviate from the direction of straight line propagation and diffraction will occur Obviously, the size of the information track on the disc recording layer is comparable to the wavelength of visible light (about 0 77 0 4 microns) The light reflected by the recording layer constantly encounters orbital dense lines in the process of propagating close to the recording layer, and it is easy to produce diffraction phenomena, and the diffraction range continues to expand from the center of the disc Furthermore, The uneven track dense grain also makes the protective layer form a transparent film with uneven thickness in various places, which will cause the visible light to interfere with the film when the upper and lower surfaces of the protective film are reflected respectively, forming color stripes

In short, the color pattern on the disc is caused by the reflection of light, diffraction, film interference and other factors

Hello, usually the disc is made up of small grid words one by one. And the reflective substance is inside these little cells. The small lattice is centered on the center, so the reflection is also centered on the center of the circle.

As for why it is colored when viewed from the side, it should be caused by refraction. The white light is composed of seven colors, and the small lattice is not smooth, so when the light is turned back, the distance traveled is different. And the light is separated, so it looks colored.

Hope it can help you a little!

Because visible light is made up of seven types of light waves.

Yellow represents hate, red represents confession, white represents friendship, purple represents crush, brown represents good, green represents original coolness, and blue represents apology.

Red represents happiness, and blue represents a vision for the future.

The disc shows that there is a layer of transparent matter, and light can be refracted 2 times, the approximate process: refraction, reflection, refraction, the essence is that dispersion occurs, and the natural white light is broken down into 7 colors of light! The oblique view shown is 7 colors, and if you look at it, it is not, and when you look at it, the light will not be refracted in direct light, only reflected!

The surface of the disc is actually uneven, but the scale is relatively small, and the interference of light can occur, and colored light appears.

Just ask the scientists! You can also ask your parents, and they may know.

Sunlight is refracted to indicate a very fine texture on the right side of the surface.

No, it should be that the amount of ammonia in your gun cylinder is not enough, and ammonia sulfate should be added.