Why does the light appear so colorful on the disc?

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.

There are tens of millions of small pits melted by the laser on the disc, which will scatter the light of the same wavelength in different directions under the sun, so the disc will not only reflect various colors of light under the sun, but also change with the change of angle.

CD-ROM: A CD-ROM is a kind of loss item that uses optical information as the carrier for storage and is used to store data. It is divided into non-rewritable discs, such as cd-rom, ***-rom, etc., and rewritable discs, such as cd-rw, ***-ram, etc.

Optical disc is a device that uses the principle of laser to read and write, and is a rapidly developing auxiliary memory, which can store a variety of text, sound, graphics, images and animations and other digital information.

Definition of optical disc: that is, high-density optical disc (compactdisc) is an optical storage medium (for example: magnetic optical disc is also an optical disc) that has been developed in modern times and is different from a completely magnetic carrier, and the method of storing and reproducing information with a focused hydrogen ion laser beam processing recording medium, also known as laser disc.

The reason for this is that the material of the reflective layer is different. Use pure gold or sterling silver, a highly reflective material, to make a reflective layer. When pure gold reflective layer + Cyanine dye is used, the CD-R disc turns green (yellow + blue = green); When using sterling silver reflective layer + Cyanine dye, the CD-R disc turns dark blue.

Among CD-R disc manufacturers, the combination of Cyanine dye + pure gold reflective layer is used more, so most of the platters using Cyanine dye are green. Because the CD-R Standard Chain (Orange Book) is based on the recording characteristics of cyanine dyes such as recording sensitivity, recording threshold, and reflectivity, and all CD-R or CD-RW burners are designed and produced in accordance with the Orange Book specifications, the green disk is compatible with various brands and models of CD-R or CD-RW recorders.

Disc main color:

Other discs are now on the market in addition to the three colors of CD-R discs we introduced above, there are also a variety of other colors of CD-R discs. There are five types of products, including blue, black, yellow, green and pink. The front and back of each disc are the same color.

But they work just like a regular CD-R. Under the color coating, there is also an ordinary blue-blue photosensitive layer. <>

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

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 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 the straight line propagation letter and diffraction will occur Obviously, the size of the information track on the disc recording layer is comparable with 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 to the outside In addition, 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 reversed, forming color stripes

There are small pits on the disc to store information, these pits play a role like a grating, when the white light is reflected on the grating, due to the interference and diffraction of light, some color light is reflected strongly in one position, and another color light is reflected strongly in another position, so that the white light is broken down into rainbow-like color light.

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 can be compared with 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 phenomenon, 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

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

No. The light of the disc is formed due to the reflection of the sun.