SEMICONDUCTOR LASERS

摘要

A semiconductor laser has an optical cavity formed between a pair of reflecting surfaces and a region or regions having a non-uniform cross section with a minimum value at a predetermined location between the reflecting surfaces so that the optical energy at both surfaces is distributed over a broader area and hence the optical intensities at the facets are reduced. The tapered bow-tie structures have a sufficiently gradual change to ensure adiabatic spatial mode-shape variation permitting single spatial mode operation. The laser is also used for Q-switching or mode-locking.