When the laser recorder is working, how many degrees can the temperature of the laser reach?

CD-R disc is made of polycarbonate with a layer of dye sprayed on the base, and the laser head controls the power of the emitted laser beam according to the different engraved data under the control of software and hardware, so that part of the dye is decomposed by heat, and the reflective point that can be read is "burned" at high temperature on the blank general sheet. Because the dye layer cannot be restored after decomposition.

CD-RW discs use a special phase change dye to store information. In the same way, the irradiation of high-power laser beams is used to heat the CD-RW disc locally instantaneously, so that the recording layer on the disc changes from the amorphous state with low reflectivity to the crystalline state with high reflectivity, so as to record the data information.

In order to erase the data repeatedly, the CD-RW recorder uses 3 lasers with different energies:

1) High-energy laser.

Also known as a write laser

power), which brings the dye layer to an amorphous state.

2) Medium energy laser.

Also known as erasure laser (erase

power), which melts the dye layer and converts it into crystals.

3) Low-energy lasers.

Also known as readout laser

power), which cannot change the state of the dye layer, is typically used to read platter data.

The laser temperature is higher than the melting point of the dye layer (500-700 degrees Celsius), when all the atoms in the irradiated area move rapidly into a liquid state. It then cools down sufficiently in a very short period of time, and this liquid state is known as the --- amorphous state.

Since the temperature of the laser beam does not reach the melting point of the dye but is higher than the crystallization temperature (200 degrees Celsius), the atoms will return to their original state after a sufficient period of irradiation (at least longer than the minimum crystallization time). --Crystalline.

The effect of temperature changes on the laser bainer is mainly:

The drift of the DU wavelength and the non-DAO stability of the ZHI output.

The wavelength drift is mainly due to the excitation capacity of the semi-inner conductor.

The wavelength of optical and solid-state lasers is basically constant.

If the output is unstable, the main reason is the change of operating temperature, and the spot pattern will also change, which will lead to poor power stability. High-power lasers generally have to increase cooling and heat dissipation, otherwise the temperature of the light-emitting chip will rise quickly, and it is easy to cause damage to the chip after exceeding the working temperature.

The drift of wavelength has no effect on laser transmission, mainly depending on whether you have strict requirements for wavelength in use.

Temperature changes will cause the laser wavelength to drift in a small range, so the general laser pumping circuit must have a temperature feedback adjustment circuit to keep the laser temperature at a constant value.