Astronomical Guide. Even the three-level green laser pointer can point to the constellations, and the green laser beam is ideal for reaching the farthest part of the sky and remaining visible, which is useful for sky watchers looking at the stars. Laser pen, also known as laser pen, refers to the star pen, etc., is processed by the transmitter. Common laser Pointers are red, blue, green, blue and violet, etc., each color of the laser pointer principle is different. The red laser pointer is the simplest, for the simple reason that it's basically just a battery, powered by a diode. There is also a laser diode that generates wavelengths. The red laser pointer, introduced in the 1980s, was a bulky device costing hundreds of dollars. It's very small and very cheap.
Class 2 laser Pointers with an output power of less than 1 milliwatt but a wavelength of 670 nanometers have low apparent brightness and may not be sufficient for all purposes. The 635nm green laser pointer produces brighter red-orange light and is satisfactory for most uses, even if the power does not exceed 1mW. However, 635 nm Pointers are a bit expensive and hard to find. One company is now marketing a pointer green laser, but it's more expensive.