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class="bm_c xld"> <b>我是如何揭露一个“科学丑闻”——“相干合成”(3):</b><div class="postmsg"><i class="pstatus"> 本帖最后由 optro 于 2013-3-19 19:31 编辑 </i><br /> <br /> 我是如何揭露一个“科学丑闻”——“相干合成”<br /> 第三篇 “平行光阵列”终结了终结了国内的10年研究<br /> 一、刘泽金课题组N束光束在远场合成的光学系统，采用N束平行光束组成“平行光阵列”，利用每束光的发散角，实现在远场的光束“合成”：<br /> 依据一、刘泽金先生在学部演讲的视频，<br /> http://www.casad.cas.cn/document.action?docid=12915<br /> 刘泽金先生认为这种阵列平行光束在相位锁定以后，已经不再是高斯光束、不再是非稳腔的平顶光束，也就是一种特殊的“相干合成”光束。<br /> 依据二、刘泽金课题组对我质疑的回复（见附件四）：<br /> http://bbs.ofweek.com/thread-667015-1-2.html）。<br /> <br /> <br /> 图中的输出就是平行光束阵列，目标就是远场光斑（详细见附件四）。<br /> 二、平行光束阵列在远场的会聚光斑直径分析：<br /> 1．单束平行光束在远场的最小光斑直径Dmin计算：<br /> 远场光斑直径D包括输出光直径D0加束散角A0*距离L形成远场光斑直径D：<br /> 光斑D=D0+L*A0<br /> D0平行光束准直后的直径或准直后高斯光束的束腰直径；A0准直后的束散角，有：<br /> D0*A0=4*（波长）/3.1415926<br /> 当波长为1.064微米，A0=0.0015/D0（弧度），D0 单位毫米，有：<br /> D=D0+0.00135*L/D0<br /> 当L=10000米=10000000毫米，D0=（0.00135*L）1/2=116毫米，，D有极小值：<br /> Dmin=232毫米，A0=0.0116毫弧度。<br /> 当L=1000米：<br /> D0=36.7毫米，Dmin=73.4毫米，A0=0.0367毫弧度。<br /> 当L=100000米：<br /> D0=367毫米，Dmin=735毫米，A0=0.00367毫弧度。<br /> 2．7单束平行光束在远场的最小光斑直径D（填充率100%）：<br /> D=3*D0+A0*L<br /> D=3*D0+0.00135*L/D0<br /> 当D0=（0.00135L/3）1/2时（D0，L单位毫米），D有极小值：<br /> L=1000米，D0=20.8毫米，A0=0.065毫弧度，Dmin=130毫米；<br /> L=10000米，D0=67.1毫米，A0=0.020毫弧度，Dmin=402毫米<br /> L=100000米，D0=212毫米，A0=0.00636毫弧度，Dmin=1.27米<br /> 三、成像光学系统在远场的会聚光斑直径分析：<br /> 我们采用美国波音公司机载激光武器使用的有效通光孔径1500毫米的透镜来进行分析。<br /> 见图二、成像光学系统图，远场会聚光斑直径D：<br /> D=d0*A0*L/D0<br /> 公式中，d0光纤激光发光点直径，A0发散角，L距离，D0会聚透镜有效通光孔径，对波长1.064微米激光有：<br /> d0*A0=4*（波长）/3.1415926=1.35（毫米毫弧度）<br /> 有：<br /> D=0.00135*L/D0（单位毫米）<br /> 当L=10000（米）=10000000（毫米），D0=1500毫米，有：<br /> D=9毫米<br /> L=1000米，D=0.9毫米；L=100公里，D=90毫米。<br /> <br /> <br /> 四、平行光束阵列和单束成像光学系统在远场功率密的比较：<br /> 1．见图三，当平行光斑束腰直径为67毫米，中心距离=67毫米，束散角为0.02毫弧度，10000米处发散光斑最小直径400毫米，填充率100%。平均功率密度：<br /> p7=7*P0/（3.14*20*20）=0.00557P0（瓦/平方厘米）<br /> P0单束激光输出功率。<br /> 2．单束单模激光，采用直径1500毫米透镜会聚在10000米处会聚光斑直径9毫米，光功率密度：<br /> p1=Po/（3.14*0.45*0.45）=1.57P0<br /> 3．7束光“相干合束”后的中心功率密度：<br /> <br /> 图右则是高斯光斑振幅分布图，中心最大归一化振幅为：<br /> I=(6*e-67/133+1)=4.62<br /> 中心光功率密度增加4.62*4.62/7=3倍（注意这仅仅是中心点，且不考虑4束光分别在其它两个平面），而不是N=7倍<br /> p7=0.00557*3*P0=0.01671P0（瓦/平方厘米）<br /> 这个功率密度比单束光低1.57/0.01671=94倍。<br /> <br /> <br /> 五、结论：<br /> 刘泽金课题组进行多年“相干合成”的研究，远场功率密度，仅是非相干合成成像光学系统达到的功率密度的1/90更低，继续研究任何意义！<br /> <br /> <br /> <br /> <br /> <br /> <br /> </div> <div style="height200px;"></div> </div> </div> </div> </div></div> </div> <!--autocomment filter by maxnum--> <div class="ft_wp"> <div id="ft" class=" cl"> <div id="flk" > <p> <a href="http://wpa.qq.com/msgrd?V=3&Uin=20600600&Site=光电工程师社区&Menu=yes&from=discuz" target="_blank" title="QQ"><img src="static/image/common/site_qq.jpg" alt="QQ" /></a><span class="pipe">|</span><a href="http://m.oecr.com" >手机版</a><span class="pipe">|</span><a href="http://so.oecr.com" title="站内搜索" target="_blank" >搜索</a><span class="pipe">|</span><a href="http://www.focaloptics.com" title="主办单位：武汉焦点光学技术有限公司" target="_blank" >焦点光学</a><span class="pipe">|</span><a 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