An optical quantum generator is now available to everyone at a low price, this is a unique device that can convert energy (in our case, electric) into light, monochromatic radiation with a specific wavelength. Ten laser modules can be used in a wide variety of electronics circuits; this unique invention can be used literally everywhere. By the way, the usual word laser is an abbreviation from the English language: light amplification by stimulated emission of radiation.
Since the laser is very sensitive to the supply voltage and has a non-linear Volt-Ampere characteristic, it is necessary to limit the current supplied to it so as not to burn it. To stabilize a certain current value, you can use the well-known LM317 chip or a trivial circuit on two pairs of transistors and resistors. Recommended supply voltage 4.5 V. Operating current up to 40 mA.
The wavelength of this quantum generator is 650 nm, and the frequency is 461 THz, respectively, and the photon energy is 0.305 J. The output power is up to 5 mW.
The power of the laser presented is certainly small, and it will not be harmful to the eyes, but it can still create a beam that will be visible on the object as a red spot at a distance of up to 600 m.The laser radius is 3 mm and the length is 22 mm. The duration of the continuous glow of the red laser is up to 2000 hours. Operating temperature from -36 to +65 Celsius.
You can use the laser module to correct shooting, as a pointer, to transmit information when reception is carried out by a photosensitive element, to create light shows, and also use the laser to create an effective security device when a loud siren is activated when the beam is interrupted, in the end, for playing with a cat.
Cost: ~ 116