The correct answer is: Gas, solid state, diode.
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term “laser” originated as an acronym for “light amplification by stimulated emission of radiation”.
There are three main types of lasers: gas lasers, solid-state lasers, and semiconductor lasers.
Gas lasers use a gas as the lasing medium. The most common gas lasers are helium-neon lasers, argon lasers, and carbon dioxide lasers. Gas lasers are typically used for applications such as spectroscopy, laser cutting, and laser welding.
Solid-state lasers use a solid material as the lasing medium. The most common solid-state lasers are ruby lasers, neodymium lasers, and yttrium aluminum garnet (YAG) lasers. Solid-state lasers are typically used for applications such as medical surgery, laser pointers, and CD players.
Semiconductor lasers use a semiconductor material as the lasing medium. The most common semiconductor lasers are diode lasers and injection lasers. Semiconductor lasers are typically used for applications such as optical communications, laser printers, and barcode scanners.
The other options are incorrect because they do not list three distinct types of lasers. Option A lists three types of materials that can be used to make lasers, but these materials can be used to make different types of lasers. Option B lists three types of lasers, but these lasers are all examples of semiconductor lasers. Option C lists three types of lasers, but these lasers are all examples of gas lasers.