Which of the following best describes continuous wave laser operation?

Continuous wave laser operation is characterized by a stable beam power output over time. This means that the laser emits a consistent, unbroken stream of light without interruption. This type of operation is typically used in applications where a constant power output is required, such as in medical, industrial, and telecommunications settings.

In contrast, other forms of laser operation may involve pulsing or variations in output. For instance, a laser that only outputs pulses would not qualify as continuous wave, as it operates in a series of discrete bursts rather than a steady stream. Additionally, a laser that is turned off frequently or emits random bursts of power would also not meet the criteria for continuous wave operation, as both scenarios introduce variability and interruptions in the laser output. Therefore, the defining characteristic of a continuous wave laser is its ability to provide a stable and uninterrupted beam of light over an extended period.