Laser adjustment goggle 455-485/532/633-640 nm, up to 10 mW
Laser light of wavelength 640 nm incident on a pair of slits produces an interference pattern in which the bright fringes are separated by 7.2 mm. calculated the wavelength of another source
High Powered 640m Single Mode Red Laser Diode, 640nm SM Laser Diode | Berlinlasers