Linearly polarized polarization-maintaining Er3+-doped fluoride fiber laser in the mid-infrared |
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Authors: | Hong-Yu Luo Yong-Zhi Wang |
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Affiliation: | State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, China |
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Abstract: | We demonstrated the ~2.8-μm and ~3.5-μm linearly polarized continuous wave (CW) laser outputs from a polarization-maintaining (PM) Er3+-doped fluoride fiber laser. By introducing a film polarizer into the cavity to select the laser polarization orientation, the ~2.8-μm linearly polarized CW laser with a high polarization extinction ratio (PER) of ~23 dB and maximum output power of 2.37 W was achieved under double-end pumping at 976 nm. By adding another 1981-nm pump source simultaneously, the ~3.5-μm linearly polarized CW laser was also obtained, giving higher PER of ~27 dB and maximum output power of 307 mW which is only limited by the available power of 1981-nm pump. To the best of our knowledge, this is the first report on a mid-infrared linearly polarized CW PM fiber laser in the >2.5-μm mid-infrared region. This work not only opens up opportunities for some new mid-infrared applications, but also provides a promising platform for developing high-stability and versatile mid-infrared laser sources. |
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Keywords: | Fiber laser Linearly polarized Mid-infrared Polarization-maintaining (PM) |
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