What is parts of laser?

A laser consists of three main parts:

1. The gain medium: This is a material that contains atoms or molecules that can absorb and store energy. When light is introduced into the gain medium, some of the stored energy is released in the form of photons that are in phase with the original light source.

2. The pumping mechanism: This is responsible for adding energy to the gain medium. The most common method of pumping is through the use of a high-energy light source such as a flash lamp or an electrical discharge.

3. The resonator: This is a cavity that contains the gain medium and reflects the light back and forth to create a highly focused, coherent beam of light. The resonator consists of two mirrors, one of which is partially reflective, allowing some of the light to escape and form the laser beam. The distance between the two mirrors determines the wavelength of the laser light.