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中国激光, 2019, 46 (12): 1215001, 网络出版: 2019-12-02   

2.62 kW,30 GHz窄线宽线偏振近衍射极限全光纤激光器 下载： 1271次

2.62-kW, 30-GHz Linearly Polarized All-Fiber Laser with Narrow Linewidth and Near-Diffraction-Limit Beam Quality
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王岩山 1,2,3,4马毅 1,3孙殷宏 1,3,*王珏 1,3常哲 1,3,4彭万敬 1,3杨小波 1,3朱日宏 2张凯 1,3唐淳 1,3
作者单位
1 中国工程物理研究院应用电子学研究所, 四川 绵阳 621900
2 南京理工大学先进固体激光工业与信息化部重点实验室, 江苏 南京 210094
3 中国工程物理研究院高能激光科学与技术重点实验室, 四川 绵阳 621900
4 中国工程物理研究院研究生部, 北京 100088
激光器 高功率光纤激光 窄线宽 线偏振 lasers high-power fiber laser narrow linewidth linear polarization 
摘要
通过同时抑制受激布里渊散射和自脉冲效应,实现了具有窄线宽和近衍射极限光束质量的高功率、线偏振全光纤放大器,其最高输出激光功率为2.62 kW,光光效率达到了86.7%,光束质量M2、偏振消光比及光谱线宽在放大过程中基本保持不变,M2小于1.3,偏振消光比约为96.3%,3 dB线宽为32 GHz,20 dB二阶矩线宽为30 GHz。2.62 kW是目前报道的窄线宽线偏振全光纤结构激光器能达到的最高输出功率。
Abstract
We demonstrate a high-power, linearly polarized all-fiber amplifier with a narrow linewidth and near-diffraction-limit beam quality by suppressing the stimulated Brillouin scattering and self-pulsing effects simultaneously. The maximum laser power is 2.62 kW with 86.7% optical-optical efficiency. Beam quality (M2), polarization extinction ratio (PER), and linewidth are well maintained during power amplification with M2<1.3, PER ~96.3%, a 3 dB linewidth of 32 GHz, and a 20 dB second-order moment linewidth of 30 GHz. To the best of our knowledge, this is the largest demonstration of an all-fiber laser with narrow linewidth, linear polarization, and beam quality near the diffraction limit.

采用多路光纤激光进行光谱合成(SBC)或相干合成(CBC)可以在保持良好光束质量的同时提升激光器系统的输出功率[1-2]。高功率全光纤窄线宽线偏振激光器在SBC和CBC中发挥着独特的作用。尤其是对于CBC系统,不仅要求光纤激光器输出为线偏振,而且对激光器的线宽有着较为严苛的要求,线宽越窄,对应的相干长度越长,越有利于对光程进行精确控制。不同于其他类型的窄线宽光纤种子源(如单频[3]、光纤振荡[4]、超荧光[5]等种子源),基于单频相位调制的种子源具有受激布里渊散射(SBS)及受激拉曼散射(SRS)阈值高、线宽在放大过程中保持不变等优点[6]。到目前为止,基于单频相位调制的窄线宽非保偏近衍射极限全光纤激光器已经实现了3 kW(48 GHz) [7]和3.7 kW(80 GHz) [6]输出。然而,相比于非保偏光纤激光器,窄线宽保偏光纤激光器具有更低的SBS和模式不稳定(MI)阈值,实现高功率输出更为困难。2017年,国防科技大学实现了2.43 kW的全光纤窄线宽线偏振激光输出,线宽为68 GHz(相干长度只有0.44 cm) [8]。2018年,美国IPG公司实现了2 kW全光纤窄线宽线偏振激光输出,线宽为30 GHz (0.11 nm,相干长度1 cm),光束质量因子M2约为1.1,功率的继续提升会受限于MI效应[9]。2019年,中国工程物理研究院应用电子学研究所采用白噪声(WNS)相位调制技术实现了1.5 kW全光纤线偏振激光输出,线宽为13 GHz(0.05 nm,相干长度2.3 cm),M2约为1.14,功率的继续提升会受限于自脉冲及SBS效应[10]。

最近,中国工程物理研究院应用电子学研究所基于WNS相位调制进一步优化光谱线宽,基于反向抽运结构(反向比正向抽运具有更高的SBS及自脉冲阈值[10]),采用全光纤结构实现了2.62 kW近衍射极限线偏振激光输出。基于单频激光相位调制的保偏全光纤放大器结构如图1所示。单频种子源由华南理工大学提供,功率约为20 mW,线宽为kHz量级。单频种子源经过基于WNS加载的相位调制器后,光谱可展宽至30 GHz左右,再通过两级保偏预放大器后种子激光功率可被放大至7 W,之后经过保偏模场适配器(PM-MFA)及保偏包层功率剥离器(PM-CPS)后被注入保偏主放大器中。保偏主放大器采用保偏(6+1)×1合束器将波长锁定的976 nm泵浦光注入纤芯和包层直径分别为20 μm和400 μm的双包层掺镱保偏光纤(PMYDF)中,放大器输出的激光经过PM-CPS后,由自研的保偏光纤端帽输出。

基于单频激光WNS相位调制的保偏全光纤放大器结构示意图Structural diagram of PM all-fiber amplifier based on WNS phase modulated single-frequency laserFig. 1

保偏主放大器输出功率的测试结果如图2所示,总泵浦功率为3.02 kW时,激光输出功率为2.62 kW,光光效率达到了86.7%。在整个放大过程中,M2、偏振消光比及光谱线宽基本保持不变,偏振消光比约为96.3%。图2(a)中的插图显示的是激光功率为2.54 kW时M2的测量结果,x和y方向M2分别为1.22和1.29。图3显示了放大器回光功率随激光功率的变化,当激光功率最高时,检测到的回光功率约为64 mW,尚未达到非线性增长阈值。如图3中的插图所示,输出激光功率最高时的3 dB线宽为32 GHz (0.12 nm,相干长度0.94 cm),20 dB二阶矩线宽为30 GHz (0.11 nm)。此外,输出激光中未发现SRS、自发辐射及泵浦光成分。该保偏光纤放大器系统功率的继续提升主要受限于MI效应(在2.62 kW时发现了MI)。进一步优化种子源调制谱特性及放大器结构,实现更高SBS及MI阈值的窄线宽线偏振光纤激光输出,是本课题组下一步工作的一项重要研究内容。

图 3. 放大器回光功率随激光功率的变化

Fig. 3.

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放大器回光功率随激光功率的变化</abstract><alt-text content-type="label" xml:lang="en" /><alternatives><graphic specific-use="online" xlink:href="1215001/img_3.jpg" xmlns:xlink="http://www.w3.org/1999/xlink" /></alternatives></fig> </div> <!-- full text end@54:57:05 --><div class="con art-reference"><div class="con-tit"><i class="bi bi-journal-text"></i> 参考文献</div><div class="con-text"><p id="Ref_1" style="margin-top: -120px;padding-top: 120px;"><a href="/Articles/Abstract?aid=OJ190221000019UqWtZw" target="_blank"><span class='ref-number'>[1]</span> 柏刚, 杨依枫, 晋云霞, 等. 光谱合成激光光束特性的研究进展[J]<b>. 激光与光电子学进展, 2019, 56(4): 040004</b>.</a></p><p style="margin-top: -120px;padding-top: 120px;"><a href="/Articles/Abstract?aid=OJ190221000019UqWtZw" target="_blank">    Bai G, Yang Y F, Jin Y X, et al. Research progress on laser beam characteristics in spectral beam combining system[J]<b>. 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//console.log(rurl); //console.log("R" + document.referrer); // 关闭对话框 $('#dlg').dialog('close'); //console.log(MathJax); //console.log("MathJax Version:"+MathJax.version);//MathJax Version:3.2.2 // 去除作者单位在小尺寸屏幕下不显示的类 $(".dpt-title").removeClass("d-none"); // 获取参数 var aid = $('.aid').val(); var keys = $('.akeys').val(); var aurl = $(".aurl").val(); // 获取微信 JSSDK 配置 $.ajax({ type: "post", url: "/Articles/getArticleWXJSConfig", dataType: "json", data: { aid: aid, url: aurl }, success: function (data) { //console.log(data); if (data.config["appName"] == "") { console.log("WX JSSDK ERROR!!!"); } else { //console.log(data); //console.log(data.config.signature); WXJSConfig(data.config.appId, data.config.timestamp, data.config.nonceStr, data.config.signature, data.config.title, data.config.link, data.config.imgUrl, data.config.desc) } }, error: function (e) { console.log(e); } }); // 加载相关论文数据 $('.related-article-click').click(function () { var relatedArticleTxt = $(".related-article").html().replace(/\s+/g, "");; if (relatedArticleTxt == "加载中...") { LoadRelatedArticleData(aid, keys); } $(this).toggleClass("active"); if ($(this).hasClass("active")) { $(".related-article").slideDown(); } else { $(".related-article").slideUp(); } }); // 加载相关资讯数据 $('.related-news-click').click(function () { var relatedNewsTxt = $(".related-news").html().replace(/\s+/g, "");; if (relatedNewsTxt == "加载中...") { LoadRelatedNewsData(aid, keys); } $(this).toggleClass("active"); if ($(this).hasClass("active")) { $(".related-news").slideDown(); } else { $(".related-news").slideUp(); } }); /////////////////////////////////// $(".store").hover(function () { var src = $(this)[0].src; var hoverSrc = $(this).attr("hoverSrc"); $(this).attr("src", hoverSrc); $(this).attr("hoverSrc", src); }); $(".store").off("hover", function () { var src = $(this)[0].src; var hoverSrc = $(this).attr("hoverSrc"); $(this).attr("src", hoverSrc); $(this).attr("hoverSrc", src); }); /////////////////////////////////// // 作者单位显示和隐藏 $(".authors-dpt .dpt-title").each(function (n, o) { $(o).click(function () { //alert($(this).data("id")); var aid = $(this).data("id"); var titletip = $(this).data("tip"); var guide = "#" + aid + "_guide"; var dpts = "#audpt_" + aid + "_2"; if ($(guide).hasClass("bi-chevron-down")) { $(dpts).slideDown(); $(guide).removeClass("bi-chevron-down").addClass("bi-chevron-up"); } else { $(dpts).slideUp(); $(guide).removeClass("bi-chevron-up").addClass("bi-chevron-down"); } }); }); // 延迟加载图片 $(".fullText-con img.figure").removeClass("lazyimg").unveil(100); /////////////////////////////////// // 论文大纲 var hasOutline = true; var bsArtOutlineOffcanvas = null; var artOutlineOffcanvas = document.getElementById('ArticleOutlineCanvas') if (artOutlineOffcanvas === undefined || artOutlineOffcanvas == null) { hasOutline = false; } else { bsArtOutlineOffcanvas = new bootstrap.Offcanvas(artOutlineOffcanvas) } //console.log(hasOutline); $(".show-outline").on("click", function () { if (hasOutline) { bsArtOutlineOffcanvas.show(); } }); /////////////////////////////////// // 论文访问统计 var isMetrics=false; // var isMetrics=true;/false; if (isMetrics) { // ① -- 论文 PDF 下载统计 // pdf charts var pdfHasChart=false; // var pdfHasChart=true/false; if (pdfHasChart) { initChartWithConfig('pdf', [],[], '近一月 PDF 下载信息', 'Tool Tip For PDF', '日期', 'PDF 下载次数'); } // ② -- 论文 FullText 下载统计 var fulltextHasChart=false; // var fulltextHasChart=true/false; if (fulltextHasChart) { initChartWithConfig('fulltext', [],[], '近一月全文浏览信息', 'Tool Tip For Full Text', '日期', '全文浏览次数'); } // ③ -- 论文摘要访问统计 var absHasChart=false; // var pdfHasChart=true/false; if (absHasChart) { initChartWithConfig('abs', [],[], '近一月摘要浏览信息', 'Tool Tip For Abstract', '日期', '摘要浏览次数'); } // ④ -- 论文查询统计 var searchHasChart=false; // var pdfHasChart=true/false; if (searchHasChart) { initChartWithConfig('search', [],[], '近一月论文被查询信息', 'Tool Tip For Search', '日期', '查询次数'); } } /////////////////////////////////// // 20221012 -- by jokechen // km animation durations -- 动态时序切换时间全局变量（方便在不重新编译情况下从网页单独修改该设置） var kmDuration = 3000; // 论文 KM var isKM=false; if (isKM) { } // 手机版首图 -- 20230425 -- Jokechen var apm = ""; if (apm.length > 0) { $(".ArticleContent .authors").after(apm).slideDown(); } }); // init chart and config function initChartWithConfig(id, data1, data2, title, tooltip, legend, seriesName) { var chart = echarts.init(document.getElementById(id+'-chart')); // 指定图表的配置项和数据 var option = { title: { text: title }, tooltip: { tooltip }, legend: { data: [legend] }, xAxis: { data: data1 }, yAxis: {}, series: [ { name: seriesName, type: 'line', data: data2 } ] }; // 使用刚指定的配置项和数据显示图表。 chart.setOption(option); } // function notice() { var aid = $('.aid').val(); var url = "/Articles/Notice?aid=" + aid; var content = '<iframe id="iframeAdd" src="' + url + '" width="100%" height="100%" frameborder="0" scrolling="yes"></iframe>'; $('#dlg').dialog({ title: "被引通知", iconCls: 'icon-add', width: "500", height: "150", content: content, noheader: true, border: false, resizable: false,//定义对话框是否可调整尺寸。 maximized: false,//默认最大化 minimizable: false, // 最小化按钮 maximizable: false, // 最大化按钮 modal: true, closed: false, onClose: function () { } }); $('#dlg').dialog('open'); $('#dlg').window('center'); // 居中 } </script> <!-- NV Page Special JS STD --> </body> </html>