Which of the following is NOT a mode of laser operation?

The correct answer is that "Amplified Wave" is not a recognized mode of laser operation. In laser technology, there are specific classifications that describe how lasers emit light. Continuous Wave refers to lasers that emit a constant beam of light over time, commonly used in various applications for their steady output.

Single Pulsed operation describes lasers that emit light in a single, short burst or pulse, which is essential in applications requiring high energy over very brief durations. Q-switched lasers are designed to emit light in a series of high-energy pulses, allowing for applications like laser marking and tattoo removal, where high peak power is necessary.

"Amplified Wave," however, does not correspond to any established mode of laser operation. This term is not commonly used in the field and does not accurately represent a method of how lasers function or emit light, making it the correct choice for this question.