RESEARCH ON MECHANISM OF MODE-LOCKING USING A SEMICONDUCTOR OF SATURABLE ABSORPTION MIRROR IN A SOLID LASER

摘要

In this paper, the mechanism of mode-locking using a semiconductor saturable absorption mirror (SESAM) in solid laser was analyzed We proposed a new opinion about how the SESAM works to realize mode-locking Because the special structure of SESAM, when it works in a mode locking laser, SESAM is not just an absorber but also works as a gain medium together with solid crystal In oscillator cavity, solid medium is pumped by an outside pump source (such as a semiconductor laser) and a light field Ec is produced. This light field Ec works as a pump source and pumps SESAM to produce another light field E_S And then solid gain medium works as an amplifier When gain and loss keep balance in cavity, continuous wave mode-locking (CWML) is realized.