In fact, you can have an infrared laser strong enough to burn things and completely invisible to the naked eye. With the development of laser technology, diode-pumped solid-state laser is a new treasure of laser presentation. It generates red, green and blue laser pointer through nonlinear optical techniques (multipliers, summers, etc.). Compared with gas lasers, solid-state lasers have the characteristics of compact structure, low power consumption, high efficiency, no water cooling and 220-volt power supply. So color doesn't really matter as far as the laser's ability to burn. Only mW force determines the burning capability of any Class IV laser at 500 mW or higher, which is best for burning.
Scientific use of laser pointers
Lasers are highly focused beams of light. It can travel long distances without diverging too much. Lasers come in all sorts of fancy shapes and sizes. As a backyard astronomer, all you need is a medium-sized green laser pointer. The first laser pointer was a helium-neon (HeNe) gas laser, which produced laser radiation at 633 nanometers (nm). These pointers are typically designed to produce laser beams with an output power of no more than 1 milliwatt (mW). According to the ANSI classification scheme (ANSI Z136.1-1993, National Standard for the Safe Use of Lasers), visible lasers operating below 1 mW (400-700 nm) are Class 2 lasers whose beat reflections generally provide adequate eye protection. This makes it useful for pointing at the stars on a dark night...and potentially dangerous to those in the sky.
Summary of Green Laser Pointers
Green laser pointers impact output at best less than 5mW in average consumption by astronomers and the general public; from a laser safety point of view, this becomes even more so when new diode lasers are developed that generate light at 670, 650 and 640 nm complex. The power output level remains at 5mW as the wavelength emitted by the diode high powered laser shrinks. With the laser pointer attached and aligned with the scope, run it around until it sees your big target name, if it looks like you're inside the eyepiece, that's it's in the US, these are called type 3a lasers. Lessen-Watt lasers, similar to those in avid CD players and laser printers, are type 1 or 2, preferably better power units, corresponding to those in medical or industrial equipment, are type 3b or Type 4.
