The parameter on the drawing of laser pointer pen should be accurate

And because the plastic laser welding power source the size of the less demanding, but the controllability and ease of operational requirements higher, the semiconductor laser is also useful in plastic welding useless. CO2, Nd: YAG and diode laser wavelength of three light sources, the maximum power, minimum focus diameter and other parameters typically are listed below. The green laser pointer with memory function is a kind of new product in the market.

CO2 laser: the wavelength is longer, at 10.6 microns, is a far-infrared bands, in general, plastic materials, the absorption wavelength of the good. Currently the maximum output power of 50kW, conversion efficiency of about 10%, the minimum focus diameter of about 0.2 ~ 0.7mm. The heat effect zone of plastic welding depth deeper need for welding thick plastic material.
Meanwhile, the electrons from the p-type semiconductor into the external circuit, the resulting hole in the opposite direction along the electric field to the pn junction diffusion. In the pn junction near the carrier toward the opposite doped semiconductor material spread around a few microns. The parameter on the drawing of laser pointer pen should be accurate.

This pn junction carrier recombination is also known as laser diode laser. 1962 invention of semiconductor lasers is on the n-type GaAs substrate with the formation of the pn junction diffusion method. Because both n-and p-type GaAs, so called homojunction.