High power single transverse mode operation of a tapered large-mode-area fiber laser

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• 作者：Libo Li ; Qihong Lou ; Jun Zhou ; Jingxing Dong ; Yunrong Wei ; Songtao Du ; Bing He
• 关键词：Coherent optical effects ; Quantum well structures ; Slow light ; All-optical switch
• 刊名：Optics Communications
• 出版年：2008
• 期刊代码：50_00304018
• 类别：ph
• 出版时间：15 February 2008
• 卷：281
• 期：4
• 页码：655-657
• 文件大小：397 K

摘要

To get high output power with good beam quality, a tapered section is introduced to large-mode-area (LMA) Yb-doped fiber laser. Output characteristics of the fiber laser without tapered section and with tapered section are compared experimentally. When the launched pump power is 119.1 W, 77.9 W with M² 3.08 and 56.4 W with M² 1.14 can be obtained, respectively. The corresponding slope efficiencies are 71.8%and 54.1%, respectively. Although output power of the tapered fiber laser has 30.6%penalty, brightness of it is as much as 5.28 times of the fiber laser without tapered section. Moreover, spectra of them are measured. It is found that tapered section makes lasing wavelength of the fiber laser shorter.