Which set lists the main components of a laser?

Which set lists the main components of a laser?

• A. Peltier Cooler, Optical Fiber, Lens
• B. Photocathode, Anode, Cathode
• C. Power Pumping Station, Active Medium, Optical Cavity
• D. Power Supply, Wavelength Divider, Echo Chamber

Answer: (C)

A laser is built from three essential parts: a gain (active) medium that amplifies light, a pumping mechanism to energize that medium into population inversion, and an optical cavity or resonator that provides feedback to build up a coherent laser beam. The set that matches this is the one with a pumping station to energize the medium, the active medium itself, and an optical cavity to reflect light back through the medium. Together, the pump energizes the atoms, the active medium provides the gain, and the optical cavity sustains and shapes the output beam. The other sets include items that aren’t fundamental laser components—for example, cooling devices or lenses in some cases, or elements related to detectors or other optical systems—so they don’t capture the three core parts needed for laser operation.

A laser is built from three essential parts: a gain (active) medium that amplifies light, a pumping mechanism to energize that medium into population inversion, and an optical cavity or resonator that provides feedback to build up a coherent laser beam. The set that matches this is the one with a pumping station to energize the medium, the active medium itself, and an optical cavity to reflect light back through the medium. Together, the pump energizes the atoms, the active medium provides the gain, and the optical cavity sustains and shapes the output beam.

The other sets include items that aren’t fundamental laser components—for example, cooling devices or lenses in some cases, or elements related to detectors or other optical systems—so they don’t capture the three core parts needed for laser operation.