Photodiode (LD) Lipu solid-state green laser pointer have the characteristics of small size, high efficiency, long life and high power, and have great application prospects. Among them, green lasers that emit green light are an important class of lasers. The structure of LD Lipu's solid-state green laser mainly includes LD Lipu light source, laser crystal, frequency doubling crystal and output mirror. After the laser crystal absorbs the Lipu light emitted by the LD Lipu light source, it converts the Lipu light into fundamental frequency light, and the fundamental frequency light becomes green frequency doubled light after passing through the frequency doubling crystal. In the solid-state green laser of LD Lipu, one LD Lipu light source, one laser crystal, and one nonlinear crystal are usually used. The green laser emitted by this type of laser has only one wavelength, and the line width is very narrow, and the coherence is strong. When this kind of green laser beam is used in laser display, laser lighting and other fields, serious speckle effect will appear, which limits its application. This path is a 808nm semiconductor laser as the pump light source, pumping a 1064nm laser; after passing through a frequency doubling crystal, it is converted into a 532nm green laser. Designing two conversion processes of three wavelengths, the efficiency of each conversion is not 100% (in fact, it is far from 100%), so there are a lot of original wavelengths remaining. So the dim red light you see is actually 808nm light.
A green laser, characterized in that, the high powered laser includes: a plurality of diode-pumped laser light sources, and a corresponding plurality of laser crystals corresponding to the laser light source are respectively used for converting laser light from the corresponding laser light source into a plurality of laser light sources. Fundamental frequency light; a non-linear crystal with a multi-period or quasi-periodic structure for multiplying the frequency of the multiple fundamental frequency lights into multiple wavelengths of green light, and a green light output mirror for outputting the green light. The working principle of the current green semiconductor laser is to perform wavelength conversion on the 1064nm infrared light emitted by the infrared semiconductor laser through nonlinear crystallization, so that it emits 532nm green light. The green light is not emitted directly from the semiconductor laser. In addition, as green lasers, there are nonlinear crystals that make infrared light from solid-state lasers such as YAG lasers emit green light. The above-mentioned lasers all have the problem that the emission wavelength is limited to 532nm, and the power conversion efficiency is low due to the wavelength conversion, which is waiting to be solved. At present, "green semiconductor lasers" are commonly used for civilian purposes and are used as laser pointers and rear-projection TV light sources.