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class="bm_c xld"> <b>激光谐振腔设计的若干问题:</b><div class="postmsg">个人小小总结了一下激光谐振腔的设计思路和需要注意的问题。<br /> 欢迎交流。<br /> </div> <div class="postmsg"><img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /> <img src="static/image/smiley/default/em17.gif" smilieid="46" border="0" alt="" /><br /> <br /> [<i> 本帖最后由 kisfire 于 2008-1-4 16:05 编辑 </i>]</div> <div class="postmsg">赞同楼主文中的观点。<br /> 1%掺杂的Nd:YAG晶体，入射808泵浦功率接近30W时(光斑约800微米)，晶体表面的等效热透镜曲率半径经实验测算可达约20到30mm。在这样严重的热透镜效应下，要保证808和1064的横模匹配(即保证基横模输出)，保证腔的稳定性不离开稳区中心太远，最重要的是要保证腔的热稳定性，真难。我用类望远镜腔的结构能设计出约20mm的热稳定范围(即等效热透镜曲率半径有20mm的变化允许范围)。这个实验还没做。用插入单透镜的较简单结构，则热稳定范围仅为约10mm，这个实验在做，还没成功。总之，热稳定范围太小了。这样的腔，即使是调出来也没多大的工程应用价值。<br /> 另外在这样的泵浦功率密度下，晶体极易出现裂痕。<br /> 在这里渴望和各位同仁交流：<br /> 1，你们测得的等效热透镜曲率半径会这么小吗？<br /> 2，你们能做到较宽的热稳定范围吗？<br /> 3，你们用什么办法克服晶体破裂的问题？<br /> 我在考虑增大泵浦光斑尺寸(但基模光斑太大，热稳定范围似乎更小)。降低掺杂也许是较为有效的办法。<br /> <br /> <font color="Blue">新增两个问题：<br /> 4，对光纤输出的808nm泵浦激光的聚焦过程进行理论模拟，各位可以做到多准确？我做的结果和实验似乎还有一些出入。<br /> 5，谐振腔的理论设计和实验吻合的好吗？我怎么总觉得差距不小呢？为此已受够lb的白眼和打击了。</font><br /> <br /> [<i> 本帖最后由 再也不能这样 于 2008-1-7 09:39 编辑 </i>]</div> <div class="postmsg">掺杂降低，长度增加<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /></div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>kisfire</i> 于 2008-1-4 16:44 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421741&ptid=65122" target="_blank"><img id="aimg_cOde1" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> 掺杂降低，长度增加<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> </blockquote></div><br /> 降低掺杂，增加长度，只能解决晶体受热损坏的问题，还是不能解决热透镜焦距的问题。</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>再也不能这样</i> 于 2008-1-4 16:42 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421739&ptid=65122" target="_blank"><img id="aimg_GsEwW" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> 赞同楼主文中的观点。<br /> 1%掺杂的Nd:YAG晶体，入射808泵浦功率接近30W时(光斑约800微米)，晶体表面的等效热透镜曲率半径经实验测算可达约20到30mm。在这样严重的热透镜效应下，要保证808和1064的横模匹配(即保证 ... </blockquote></div><br /> 插入透镜这个东西会使得谐振腔的初始调整难度大大增加，所以调出光都很困难。</div> <div class="postmsg">增大光斑,降低掺杂应该可以让热透镜焦距变大点吧。变大了腔设计会容易一些。</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>watermoon</i> 于 2008-1-4 16:54 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421747&ptid=65122" target="_blank"><img id="aimg_c5Juj" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> <br /> 插入透镜这个东西会使得谐振腔的初始调整难度大大增加，所以调出光都很困难。 </blockquote></div><br /> 还好。插入透镜本质上和做折叠腔是一样的啊。</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>再也不能这样</i> 于 2008-1-4 16:57 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421748&ptid=65122" target="_blank"><img id="aimg_RSQyZ" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> 增大光斑,降低掺杂应该可以让热透镜焦距变大点吧。变大了腔设计会容易一些。 </blockquote></div><br /> 是可以啊，光斑增大了，就需要增大基模体积，腔的体积就会跟着长大。<br /> 客户可不喜欢那么大的激光头。</div> <div class="postmsg">3楼的晶体也太脆弱了吧。<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /></div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>watermoon</i> 于 2008-1-4 17:00 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421752&ptid=65122" target="_blank"><img id="aimg_ENT6M" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> <br /> 是可以啊，光斑增大了，就需要增大基模体积，腔的体积就会跟着长大。<br /> 客户可不喜欢那么大的激光头。 </blockquote></div><br /> 可是光斑太小晶体破裂的问题怎么办呢？<br /> 客户那么关注尺寸的问题吗？高功率(>10W@10kHz)和稳定的基横模不是更重要吗？</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>bigflfl</i> 于 2008-1-4 17:05 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421754&ptid=65122" target="_blank"><img id="aimg_gkF93" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> 3楼的晶体也太脆弱了吧。<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> </blockquote></div><br /> 你们的晶体可以承受多少W呢？光斑尺寸？</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>bigflfl</i> 于 2008-1-4 17:05 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421754&ptid=65122" target="_blank"><img id="aimg_hi6P1" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> 3楼的晶体也太脆弱了吧。<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> </blockquote></div><br /> 我们用的是c a s i x的nd:yag。有更耐打的晶体推荐吗？<br /> <br /> [<i> 本帖最后由 再也不能这样 于 2008-1-4 17:14 编辑 </i>]</div> <div class="postmsg">什么东西啊 根本不明白 哈哈哈哈哈哈</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>再也不能这样</i> 于 2008-1-4 17:06 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421755&ptid=65122" target="_blank"><img id="aimg_cGG4I" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> <br /> 可是光斑太小晶体破裂的问题怎么办呢？<br /> 客户那么关注尺寸的问题吗？高功率(>10W@10kHz)和稳定的基横模不是更重要吗？ </blockquote></div><br /> 同等水平下，别人当然喜欢小型化的东西啦，结构紧凑嘛。<br /> 所以还是设计大模体积的谐振腔才是王道！</div> <div class="postmsg">继续关注！<br /> <br /> 等下有问题请教各位，请帮忙！</div> <div class="postmsg">关注中!<br /> 希望多多讨论!<img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /> <img src="static/image/smiley/default/em49.gif" smilieid="78" border="0" alt="" /></div> <div class="postmsg">不错，谢谢，华工的朋友<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /> 。<img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /></div> <div class="postmsg">端泵YAG，哪有用1.0% 这么大的掺杂浓度阿，楼主必须考虑降低掺杂才有希望走下去。</div> <div class="postmsg">谢谢LZ，学习了，我刚入门不长时间，还是学生，很感谢LZ</div> <div class="postmsg">我是新手,下来学习一下 ,谢谢楼主了</div> <div class="postmsg">未完待续。。。待续呢？期待。。。</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>watermoon</i> 于 2008-1-4 14:05 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=421661&ptid=65122" target="_blank"><img id="aimg_mIMVK" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> 个人小小总结了一下激光谐振腔的设计思路和需要注意的问题。<br /> 欢迎交流。<br /> 22366 </blockquote></div><br /> <br /> 不大同意文中的部分观点，LZ似乎是针对平平腔而言。并不是激光器腔越长，基膜体积就越大，基模体积的大小的看你激光器怎么设计了。曾经做过1m和10m左右的腔，相同的泵浦电流下，22W 808nm，1064nm基模均能出9W。</div> <div class="postmsg">继续努力学习中，大家积极讨论哈</div> <div class="postmsg">增大光斑半径，同时会增加泵浦阈值功率，影响斜效率。这一方面对最终输出功率或许有影响。另外，楼上说增大泵浦泵浦光光斑后，会让腔的体积变大，这是因为泵浦光光斑增加，要想实现模式匹配，基膜半径也必须增加，这就使得腔型结构变化，这里主要是长度变化吧？难道没有别的办法可以不改变腔体积，比如选用合适的曲率半径的镜子？另外一个问题，如果要实现大的模式体积，也就是增加基膜半径，这不也意味着要增加泵浦光半径吗？还是我理解上有问题？<br /> <br /> [<i> 本帖最后由 korjon 于 2008-10-30 18:24 编辑 </i>]</div> <div class="postmsg"><div class="quote"><blockquote>原帖由 <i>wwwcai</i> 于 2008-10-29 13:15 发表 <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=490805&ptid=65122" target="_blank"><img id="aimg_XWzu8" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a><br /> <br /> <br /> 不大同意文中的部分观点，LZ似乎是针对平平腔而言。并不是激光器腔越长，基膜体积就越大，基模体积的大小的看你激光器怎么设计了。曾经做过1m和10m左右的腔，相同的泵浦电流下，22W 808nm，1064nm基模均能出9W。 </blockquote></div><br /> 谢谢你的建议，不知道我文中是否有提到过“一般情况下”这个字眼，我完全没有把条件说死，所谓“一般”，是指热透镜效应不是足够明显的时候，这个度就自己在设计过程中自己把握了。建议只是建议，并不是死搬硬套哦。。。。</div> <div class="postmsg">学习，学习！ <img src="static/image/smiley/default/em31.gif" smilieid="60" border="0" alt="" /></div> <div class="postmsg">昨天向watermoon请教了一些问题，在这表示感谢</div> <div class="postmsg">新手前来学习。<br /> </div> <div class="postmsg">谐振腔在腔长拉长的过程中会有一个最佳功率值吗？如果是这样，那么如何计算呢？（说的端泵激光器）</div> <div class="postmsg">降低浓度，增加腔长可以降低热效应，热焦距也会相应的减少一些吧，我想。<br /> 增大泵浦光斑确实不怎么好，还是怎的震荡激光吧</div> <div class="postmsg">感谢搂主长期以来对大家的帮助！</div> <div class="postmsg"><div class="quote"><blockquote>谐振腔在腔长拉长的过程中会有一个最佳功率值吗？如果是这样，那么如何计算呢？（说的端泵激光器）<br /> <font size="2"><font color="#999999">脉冲LD 发表于 2009-1-15 10:45</font> <a href="http://bbs.oecr.com/redirect.php?goto=findpost&pid=513188&ptid=65122" target="_blank"><img id="aimg_UfNFu" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a></font></blockquote></div><br /> 理论上应该是有的, 而且可能不止一个. 但是实际做起来不确定因素太多, 所以我喜欢直接实验做看能调到多大...</div> <div class="postmsg">谢谢楼主！！！！！！！！！！！！！！！！！！！！！！</div> <div class="postmsg">要得到大的模体积，那采用下非稳腔试试看了。不过，非稳腔的衍射损耗比较大。</div> <div class="postmsg">学习学习，经验，可使自己少走弯路。</div> <div class="postmsg">下来看看，谢谢楼主！！！！！！！！！！！！！！</div> <div class="postmsg">hao!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</div> <div class="postmsg">hao!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!</div> <div class="postmsg">老贴子了，谢谢楼主的总结和分享，我觉得Ｇ参数还是有些用处，比如计算失谐灵敏度和热焦距敏感上，尽量保持ｇ１×ｇ２＝.５，对激光器实际操作还是有意义的。</div> <div class="postmsg">我就使用过凌云的端面泵浦激光器，感觉温度控制的很不好<br /> 壳子的温度大概4，50度很烫手，但温控器还是显示24度，我觉得这对腔的稳定性影响很大</div> <div class="postmsg">很好的话题，不过理论与实际操作确实有一定的差距</div> <div class="postmsg">支持一下，希望对大家有所帮助！</div> <div class="postmsg">好东西，谢谢楼主分享！！！！！</div> <div class="postmsg">好的！谢谢啦！！！！！！！！！！！！！！</div> <div class="postmsg">拜读中，这方面确实很复杂，值得深入探讨</div> <div class="postmsg"><img src="static/image/smiley/Tiger/05.gif" smilieid="143" border="0" alt="" /><img src="static/image/smiley/Tiger/05.gif" smilieid="143" border="0" alt="" /><img src="static/image/smiley/Tiger/05.gif" smilieid="143" border="0" alt="" />顶一个</div> <div class="postmsg"><i class="pstatus"> 本帖最后由 optro 于 2010-11-16 10:08 编辑 </i><br /> <br /> <strong>回复 <a href="http://www.oecr.com/forum.php?mod=redirect&goto=findpost&pid=421739&ptid=65122" target="_blank"><font color="Olive">再也不能这样</font> 的帖子</a></strong><br /> <br /> 如果您说的“入射808泵浦功率接近30W时(光斑约800微米)，晶体表面的等效热透镜曲率半径经实验测算可达约20到30mm”成立，1000瓦以上的侧泵DPL就很难出光，这时晶体内吸收的热量大约是400瓦/立方厘米。请问这台30瓦的激光器的增益体机多大？透过率多高？这个热焦距是如何测量的？</div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">wwwcai 发表于 2008-10-29 13:15</font> <a href="http://www.oecr.com/forum.php?mod=redirect&goto=findpost&pid=490805&ptid=65122" target="_blank"><img id="aimg_B8Gck" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a></font><br /> 不大同意文中的部分观点，LZ似乎是针对平平腔而言。并不是激光器腔越长，基膜体积就越大，基模体积的大 ...</blockquote></div><br /> DPL做一米，十米的腔，热焦距大概为零，调校您用He-Na?这是的光斑又如何？</div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">shizh 发表于 2008-8-10 19:13</font> <a href="http://www.oecr.com/forum.php?mod=redirect&goto=findpost&pid=472348&ptid=65122" target="_blank"><img id="aimg_OHJpE" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a></font><br /> 端泵YAG，哪有用1.0% 这么大的掺杂浓度阿，楼主必须考虑降低掺杂才有希望走下去。</blockquote></div><br /> 对呀，<br /> 连续激光器的掺杂一般较低</div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">korjon 发表于 2008-10-30 18:16</font> <a href="http://www.oecr.com/forum.php?mod=redirect&goto=findpost&pid=491353&ptid=65122" target="_blank"><img id="aimg_d1m2n" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a></font><br /> 增大光斑半径，同时会增加泵浦阈值功率，影响斜效率。这一方面对最终输出功率或许有影响。另外，楼上说增大 ...</blockquote></div><br /> 看来您应该从新会学校，学学应用光学了。</div> <div class="postmsg"><div class="quote"><blockquote><font size="2"><font color="#999999">olas 发表于 2009-2-23 16:58</font> <a href="http://www.oecr.com/forum.php?mod=redirect&goto=findpost&pid=525906&ptid=65122" target="_blank"><img id="aimg_i3Hur" onclick="zoom(this, this.src, 0, 0, 0)" class="zoom" src="static/image/common/back.gif" onmouseover="img_onmouseoverfunc(this)" onload="thumbImg(this)" border="0" alt="" /></a></font><br /> 要得到大的模体积，那采用下非稳腔试试看了。不过，非稳腔的衍射损耗比较大。</blockquote></div><br /> 连续激光由于增益小，非稳腔不出光或效率难以接受。</div> <div class="postmsg">最后问一下楼主，30瓦单横模激光器您做出来了吗？<br /> 如果做出来了一定是接近1.35毫米*毫弧度，这样的光意味着什么？<br /> 如果这个问题您回答不了，您这个30瓦单模就？？？？？？</div> <div class="postmsg">这个真的很有用，学习了不少东西</div> <div class="postmsg"><strong>回复 <a href="http://www.oecr.com/forum.php?mod=redirect&goto=findpost&pid=421704&ptid=65122" target="_blank"><font color="Olive">kisfire</font> 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