If you compare the green Laser pointer with the same powerful red laser, you will find that the green laser is about 10 times brighter. The first laser pointer used a miniaturized HeNe laser. However, only after cheap and efficient laser diodes appeared, laser pointers achieved a breakthrough in mass production. Before the advent of laser diodes, and the price was not expensive, but equipped with lens optics, so that a simple slide projector can be used to project the arrow symbol (plane or outline). There is also a special E10 bulb, in which the filament itself is designed into an arrow shape.The disadvantage is that most of the execution process is very weak, and the lens optical elements need to be constantly readjusted to adapt to the distance from the projection surface.
In most cases, an inexpensive red laser diode (wavelength 635-750 nm) is used. A frequency doubled DPSS laser (532 nm) is usually used for the green model. The orange model uses a mixture of two laser sources.Green (490–575 nm) and more expensive orange to yellow (575–635 nm) and blue (405–490 nm) laser pointers are also now available. The human eye is about 10 times more sensitive to green light than to all other colors. Some illuminated objects will fluoresce at 405 nm.These were provided by Laser Pointer 2000mw Slide Projector Company’s light pen.
The advantage of this arrangement is the arrow symbol, which can be used to point to something more meaningful than the tip of a laser pointer.The beam from the green 5 mW laser pointer is aimed at a palm tree at night. The following components are installed in a convenient housing: Laser diode (also called semiconductor laser) The collimating lens battery is used to control the electronic circuit of the laser diode, usually composed of only a resistor, the laser diode mainly used is returned at the time of manufacture It is classified as substandard products for industrial use.
