Question

The excitation of atoms from ground state to higher energy levels by supplying suitable energy in lasers is called

Answer 1

Explanation:

Laser Operation and Components

• The process of light stimulated emission is fundamental to laser operation.
• Laser light is produced by an active medium, or gain medium inside the laser optical cavity. The active medium is a collection of atoms, or molecules that can undergo stimulated emission. The active medium can be in a gaseous, liquid or solid form.
• For lasing to take place, the active medium must be pumped into an excited state capable of undergoing stimulated emission. The energy required for excitation is often supplied by an electric current or an intense light source, such as a flashlamp.
• To induce stimulated emission, the laser cavity must provide a means to reflect, or feedback emitted light into the gain medium.
• A laser must have an output coupler to allow a portion of the laser light to leave the optical cavity.

Laser Optical Cavity