| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Analysis of gain distribution in cladding-pumped thulium-doped fiber laser and optical feedback inhibition problem in fiber-bulk laser system |
| Ji En-Cai (吉恩才), Liu Qiang (柳强), Hu Zhen-Yue (胡震岳), Gong Ma-Li (巩马理) |
| State Key Laboratory of Precision Measurement Technology and Instruments, Center for Photonics and Electronics, Department of Precision Instrument, Tsinghua University, Beijing 100084, China |
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Abstract The steady-state gain distribution in cladding pumped thulium-doped fiber laser (TDFL) is analytically and numerically solved based on the rate equations including loss coefficients and cross relaxation effect. With the gain curve, a problem, which is named optical feedback inhibition (OFI) and always occurs in tandem TDFL-Ho:YAG laser system, is analyzed quantitatively. The actual characteristics of output spectra and power basically prove the conclusion of theoretical analysis. Then a simple mirror-deflected L-shaped cavity is employed to restrain the external feedback and simplify the structure of fiber-bulk Ho:YAG laser. Finally, 25 W of 2097-nm laser power and 51.2% of optical-to-optical conversion efficiency are obtained, and the beam quality factor is less than 1.43 obtained by knife-edge method.
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Received: 31 May 2015
Revised: 24 June 2015
Accepted manuscript online:
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PACS:
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42.55.Wd
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(Fiber lasers)
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42.55.Rz
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(Doped-insulator lasers and other solid state lasers)
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42.60.Mi
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(Dynamical laser instabilities; noisy laser behavior)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61275146), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20120002110066), and the Special Program of the Co-construction with Beijing Municipal Government of China (Grant No. 20121000302). |
Corresponding Authors:
Liu Qiang
E-mail: qiangliu@mail.tsinghua.edu.cn
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Cite this article:
Ji En-Cai (吉恩才), Liu Qiang (柳强), Hu Zhen-Yue (胡震岳), Gong Ma-Li (巩马理) Analysis of gain distribution in cladding-pumped thulium-doped fiber laser and optical feedback inhibition problem in fiber-bulk laser system 2015 Chin. Phys. B 24 104210
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