Natural lasers utilize a natural (carbon based) material as the increase medium. The primary natural laser was the fluid color laser. These lasers utilize laser color arrangements as their pick up media. Natural lasers are innately tunable and when designed as enhanced different crystal grinding laser oscillators can yield productive single-transverse mode, and single-longitudinal-mode, discharge with laser line widths as tight as 350 MHz (roughly 0.0004 nm at a wavelength of 590 nm), in the high-control beat administration.
1. Solid-state dye lasers
3. Distributed feedback laser