I am reading a user's manual, and the word appears here. At first, I think "CW" means "center wave". But later, I find that the meaning of "CW" is "continuous wave".
It makes me confused. Generally, Laser has a unique frequency. Properly speaking, it has a too small fluctuation of frequency, or line width, such that we can treat the spectrum as harmonic wave which has a unique frequency.
So, literally, dose "continuous wave" means a wave which is not interrupted? Is it the same as "harmonic wave"?