我想求购一台输出功率大于30W的808nm数值孔径小于1.5的半导体激光器，那位知道有哪些厂家有这类产品，麻烦通告一声

揭秘金融危机下企业的生存法宝 我们很难说2008年底百年不遇的金融危机会对各个领域造成多大的影响，全球金融危机下，大大小小的各种各样的公司倒下去了， 似乎是一场全球性的大灾难，无法避免。大部分公司已经抱定今年业绩急剧下滑的心理准备，几乎没有任何亢奋一点的想法。作为中国的一些中小企业或者微型公司，怎能不胆战 ...

Consider the energy levels involved in the operation of a He-Ne laster. Consider the lifetimes of the various levels. Which should be long, which sould be short. Explain why the actual laser transition is weak in luorescence by looking at the He-Ne laser rom the side. If the small signal gain of t ...

Consider increasing the Na density more and more. The size of the sample is the same. Draw a sequence of emission spectra and absorption spectra or an increasing optical epth. (Consider the propagation of the light, the exponential absorption etc. Sketch the spectra for the limiting case of very hi ...

1. take a sample of sodium atoms and put them inside a flame at T=3000K. what will be the spectrum we can see? the relative Einstein coefficients for the two yellow line are 1:2, Can we resolve the two yellow lines ?what is the dominant line broadening effect? what will be the line profile?(Gaussian ...

[local]1[/local]非线性光学谁要？

关于激光的基础书籍，必看

激光物理 （第二版） 希望对大家有用阿，

谁要非线性光学？我有，但课件没有，想交换.

急！请问哪里有找有关光度学的中英文对照资料？ 谢谢帮忙