From: julia.cnilaser@gmail.com   
      
   åœ¨ 2015å¹´10月13日星期二 UTC+8下堠 
   ˆ3:47:22，Lu Wei写é�“：   
   > Hi, I see there are laser experts in this group and I need your help.   
   >    
   > I use an ellipsometer from SENTECH Instruments GmbH, type SE400PV. It   
   > uses a Uniphase model 1107P as light source. I need to know its coherent   
   > length, so as to determine whether coherence should be taken into   
   > account in some measurement cases. Through Google I download a pdf   
   > containing parameters of that model, but I can't find the coherent   
   > length, or related bandwidth. Is this parameter generally the same for   
   > all He-Ne laser so it is not listed in the product manual?   
   >    
   > The product parameters in the manual:   
   > http://postimg.org/image/p5yf2bm39/   
   >    
   > --    
   > Regards,   
   > Lu Wei   
   > PGP key ID: 0x92CCE1EA   
   Maybe you could contact the staff who sold the product to you, they would be   
   pleasure to answer you.   
      
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