Get the concept of: reflection, a diode laser, a Gaussian beam, monomodovom and multimode glass fiber, numerical aperture, the longitudinal and transverse modes, time passes, the threshold energy, beam divergence, the velocity of light
Experiment: The laser beam is split in the path inside the single-mode fiber. We study issues related to the splitting of the beam, there is a passage through the fiber low-frequency signal is recorded numerical aperture. Measure the travel time of light in the fiber, as well as the speed of light in the fiber. Measured dependence of the relative output power of diode laser current, which allows us to introduce this feature for laser as "threshold energy".
