Which component surrounds the laser medium?

Which component surrounds the laser medium?

• A. Chromophore
• B. Optical Cavity
• C. Delivery System
• D. Collimated Light

Answer: (B)

A laser needs a resonator around the gain medium to trap photons and provide feedback that amplifies light. The surrounding optical cavity, usually made of mirrors, reflects light back through the medium so each pass stimulates more emission. This back-and-forth amplification builds up a coherent, high-intensity beam and also helps set the beam’s direction, wavelength, and mode structure. The other terms aren’t parts of the laser’s structure: a chromophore is a molecule that absorbs light, the delivery system guides energy to the treatment area, and collimated light describes the beam’s parallel rays rather than a physical component surrounding the medium.

A laser needs a resonator around the gain medium to trap photons and provide feedback that amplifies light. The surrounding optical cavity, usually made of mirrors, reflects light back through the medium so each pass stimulates more emission. This back-and-forth amplification builds up a coherent, high-intensity beam and also helps set the beam’s direction, wavelength, and mode structure. The other terms aren’t parts of the laser’s structure: a chromophore is a molecule that absorbs light, the delivery system guides energy to the treatment area, and collimated light describes the beam’s parallel rays rather than a physical component surrounding the medium.