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http://dx.doi.org/10.3807/KJOP.2020.31.3.142

Efficient Second Harmonic Generation of a High-power Yb-doped Fiber MOPA Incorporating MgO:PPSLT  

Song, Seungbeen (Department of Photonics and Nanoelectronics, University of Hanyang ERICA)
Park, Eunji (Department of Applied Physics, University of Hanyang ERICA)
Park, Jong Sun (Department of Photonics and Nanoelectronics, University of Hanyang ERICA)
Oh, Yejin (Department of Photonics and Nanoelectronics, University of Hanyang ERICA)
Jeong, Hoon (Manufacturing System R&D Department, Korea Institute of Industrial Technology)
Kim, Ji Won (Department of Photonics and Nanoelectronics, University of Hanyang ERICA)
Publication Information
Korean Journal of Optics and Photonics / v.31, no.3, 2020 , pp. 142-147 More about this Journal
Abstract
In this paper, we report highly efficient second harmonic generation of continuous-wave Yb fiber lasers incorporating a periodically poled LiTaO3 device (MgO:PPSLT) as a frequency converter. The seed laser output from a Yb fiber master oscillator using a Fabry-Perot feedback cavity was amplified in a Yb fiber amplifier stage, yielding 28.5 W of linearly polarized output at 1064 nm in a beam with beam quality, M2, of ~1.07. Second harmonic generation was achieved by passing the laser beam through MgO:PPSLT. Under optimized conditions, we obtained 11.1 W of green laser output at 532 nm for an incident signal power of 25.0 W at 1064 nm, corresponding to a conversion efficiency of 44.4%. The detailed investigation to find the optimized operating conditions and prospects for further improvement are discussed.
Keywords
High-power fiber laser; IR lasers; Visible laser; Quasi-phase matching; Second harmonic generation;
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