{"title":"Improved conversion efficiency of mid-infrared MgO:PPLN optical parametric oscillator by optimizing pump pulse waveform","authors":"Jindai Liu , Yang He , Yuhang Liang , Fei Chen","doi":"10.1016/j.optlastec.2025.112786","DOIUrl":null,"url":null,"abstract":"<div><div>We present a high-efficiency mid-infrared (MIR) optical parametric oscillator (OPO) based on MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal pumped by a linearly polarized ytterbium-doped fiber laser (YDFL). The YDFL can amplify the laser pulses with square, Gaussian, triangular, sinusoidal, and trapezoidal waveforms. We investigated how the MIR conversion efficiency is influenced by the pulse waveform of YDFL theoretically and experimentally. The results demonstrate that the conversion efficiency is maximized by choosing a square wave as the YDFL seed waveform, which can promote the MgO:PPLN-OPO to reach the pump threshold rapidly and allows for a longer continuous oscillation time with the same pump pulse energy. When the square-wave pump power is 61.1 W, the OPO attains a maximum power of 10.3 W with a conversion efficiency of 16.86 % at 3.759 μm.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"187 ","pages":"Article 112786"},"PeriodicalIF":5.0000,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics and Laser Technology","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0030399225003779","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/3/12 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
We present a high-efficiency mid-infrared (MIR) optical parametric oscillator (OPO) based on MgO-doped periodically poled lithium niobate (MgO:PPLN) crystal pumped by a linearly polarized ytterbium-doped fiber laser (YDFL). The YDFL can amplify the laser pulses with square, Gaussian, triangular, sinusoidal, and trapezoidal waveforms. We investigated how the MIR conversion efficiency is influenced by the pulse waveform of YDFL theoretically and experimentally. The results demonstrate that the conversion efficiency is maximized by choosing a square wave as the YDFL seed waveform, which can promote the MgO:PPLN-OPO to reach the pump threshold rapidly and allows for a longer continuous oscillation time with the same pump pulse energy. When the square-wave pump power is 61.1 W, the OPO attains a maximum power of 10.3 W with a conversion efficiency of 16.86 % at 3.759 μm.
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