Energy is absorbed in the medium, creating excited states in the atoms. Population inversion is achi...
Some laser applications require the laser to have a very narrow linewidth, that is, a narrow spectru...
The gain medium of an optical amplifier can only achieve a limited gain. One approach achieves highe...
Time-domain OCT is mainly composed of Michelson interferometers. The light emitted by the light sour...
The eye diagram is a series of digital signals accumulated and displayed on the oscilloscope. It con...
Single-frequency lasers based on Er3+-doped or Er3+/Yb3+ co-doped gain fibers mainly work in the 1.5...