The color depends on the laser's wavelength, which is set by the material properties and design. IR laser diodes, red laser diodes, green laser diodes, blue laser diodes, and violet laser diodes are available in a range of wavelengths, output powers, and package types to suit your application needs. A wide range of Infrared laser diodes are available. Why do laser pointers have different color lasers, such as red, green, and blue, and what do they mean, and which is the best and most powerful? Why are laser pointers different colors? Laser pointers are different colors because they emit light at specific wavelengths, determined by the materials. The laser diode chip is the small black chip at the front; a photodiode at the back is used to control output power. SEM (scanning electron microscope) image of a commercial laser diode with its case and window cut away. Our standard RGB laser modules cover a range of wavelengths including 405nm (violet), 450nm (blue), 520nm (green), 635nm. first Blu-ray systems using 405 nm InGaN laser diodes entered the commercial markets. The image above shows our real results. Let's break it down: These colors yielded crisp, high-contrast engravings: These darker or warmer-toned acrylics absorb the blue laser light.