Single-Frequency Active Fiber Lasers

Highly Er/Yb-Co-Doped Photosensitive Core Fiber for the Development of Single-Frequency Telecom Lasers

“…Although silica glass has a number of advantages that make it the most widely used optical fiber material, the maximum doping concentration of rare-earth ions in silica glass is limited, due to the clustering effect leading to undesirable cooperative interactions among active ions. Therefore, after the demonstration of a number of single-frequency fiber lasers based on silica optical fibers, the interest of researchers has shifted to the area of creating single-frequency fiber lasers utilizing optical fibers made of multicomponent glass, which provides more efficient laser generation due to the relatively high concentration of active rare-earth ions in multicomponent glass [4,5]. However, despite the fact that optical fibers made of silica glass are inferior in lasing efficiency compared to multicomponent fibers due to the lower concentration of rare-earth ions, nevertheless, a combination of other positive qualities makes silica fibers a promising active medium for single-frequency lasers when high powers are not required.…”