HETEROJUNCTION SATURABLE ABSORBER MIRROR AND METHOD FOR PREPARING SAME, AND MODE-LOCKED FIBER LASER

摘要

Provided is a heterojunction saturable absorber mirror, comprising a substrate (101), a heterojunction thin film (102) covering the substrate, and a protective film layer (103) positioned on the heterojunction thin film. The heterojunction thin film comprises at least two saturable absorbing layers, and the material of each saturable absorbing layer is different from one another. Further provided is a method for preparing the heterojunction saturable absorber mirror, comprising the following steps: polishing a substrate; placing the substrate in a reaction chamber, and sequentially plating at least two saturable absorbing layers on a gold film layer (2) by means of the CVD method to form a heterojunction thin film; and plating a protective film layer on the surface of the heterojunction thin film. The provided heterojunction saturable absorber mirror has a high damage threshold, a simple structure, a low cost, a high reliability, a simple preparation method, and is suitable for batch production.