Semiconductor laser and laser pointer

The light source of the high power laser pointer is a semiconductor laser. Since semiconductor lasers are also called laser diodes (LD), they are sometimes confused with light-emitting diodes (LEDs), but the light emitted by the two is quite different. Light-emitting diodes are based on the "spontaneous emission" principle, and semiconductor lasers are based on the "stimulated emission" principle.

The wide application of laser in life

In other words, Green laser pointer has four advantages: monochromaticity, coherence, good directivity and high brightness. Using the directionality and high brightness of laser, medical and health, military, anti-counterfeiting, anti-counterfeiting, stage (red, green, blue) light, various electric tools, measuring tools, equipment, equipment, level measurement, positioning machine, distance measurement equipment, measurement Temperature equipment, laser thread machine, various sheet cutting and forming equipment, stone talent equipment, woodworking equipment, metal crushing equipment, packaging machine thread feeding, clothing (sewing machine, tailoring machine, automatic manual cloth) cutting sewing machine, opening sewing machine, barb Sewing machines, cloth spreaders, embroidery sewing machines, printing machines, beaded sewing machines, button sewing machines, rivet machines), electronic measuring tools, mice, USB flash drives, photographic equipment, mobile phones, projection education pages. Widely used to replace pens, laser pointers, handicrafts , Indoor and outdoor decorations, flashlights, gifts, toys and other products. Quick and convenient, practical and easy to assemble. Stable and reliable. Greatly improve work output.

The wavelength principle of the laser pointer

Since the luminous flux propagates as it is, a collimating lens is placed immediately after the LD to make the propagated luminous flux collimate parallel light. This completes the blue laser pointer. However, there is a wavelength-dependent diffraction limit, so it is impossible to make it completely parallel with a collimating lens (because the light source is not a strict point focus, but a certain degree), so it may be that the distance exceeds 10m. See the light spot getting bigger and bigger. Each of the above answers has its own merits. I did a lot of research to fully understand this problem. Therefore, it is safe to sell and use laser pointers.