On Saturday, April 5, 2014 7:03:58 AM UTC-4, sgpopt...@gmail.com wrote:   
   > Phil,   
   >    
   >    
   >    
   > I own a copy of your book. It is fantastic great job.   
   >    
   >    
   >    
   > My current system, I sense an object that is far away using a very weak   
   laser. (For various reasons, it needs to be weak and it is pulsed at a low   
   frequency of 1MHz) My distance of sensing is 400mm. Now for a next version, I   
   need to extend my distance    
   of sensing to 4Meter. I currently use a si-pd and I have done a lot to make   
   this current system work at 400mm, now I need 10x the improvement, based on my   
   experience I don't think I can get this done, hence the Avalanche PD idea.   
   >    
   >    
   >    
   >    
   >    
   >    
   >    
   >    
   >    
   > >    
   >    
   > > > I am doing the architecture for a new optical design for onsumer   
   >    
   > >    
   >    
   > > > market and I need a reasonably price Avalanche Photo-diode with   
   >    
   > >    
   >    
   > > > relatively big size. Who would be a good vendor for this type of   
   >    
   > >    
   >    
   > > > diodes? My signal is not very high frequency. (2MHz).   
   >    
   > >    
   >    
   > > >   
   >    
   > >    
   >    
   > > > I have used Hamamatsu before but I think you cannot make money by   
   >    
   > >    
   >    
   > > > using Hamamatsu.   
   >    
   > >    
   >    
   > > >   
   >    
   > >    
   >    
   > > > Thx.   
   >    
   > >    
   >    
   > > >   
   >    
   > >    
   >    
   > >    
   >    
   > >    
   >    
   > > Have you done a careful photon budget?  It would be pretty rare to need    
   >    
   > >    
   >    
   > > an APD for a consumer application.  If you spend less than the price of    
   >    
   > >    
   >    
   > > one ordinary Hamamatsu photodiode, you can get a copy of my book.    
   >    
   > >    
   >    
   > > Chapter 1 is all about photon budgets, and has lots of examples.   
   >    
   > >    
   >    
   > >    
   >    
   > >    
   >    
   > > Cheers   
   >    
   > >    
   >    
   > >    
   >    
   > >    
   >    
   > > Phil Hobbs   
   >    
   > >    
   >    
   > >    
   >    
   > >    
   >    
   > > --    
   >    
   > >    
   >    
   > > Dr Philip C D Hobbs   
   >    
   > >    
   >    
   > > Principal Consultant   
   >    
   > >    
   >    
   > > ElectroOptical Innovations LLC   
   >    
   > >    
   >    
   > > Optics, Electro-optics, Photonics, Analog Electronics   
   >    
   > >    
   >    
   > >    
   >    
   > >    
   >    
   > > 160 North State Road #203   
   >    
   > >    
   >    
   > > Briarcliff Manor NY 10510   
   >    
   > >    
   >    
   > >    
   >    
   > >    
   >    
   > > hobbs at electrooptical dot net   
   >    
   > >    
   >    
   > > http://electrooptical.net   
      
   Yes, great book.    
      
   Phil I'm sure will respond to this, but as for me, I would like to know (to   
   the    
   gnat's ass) exactly what your optical configuration is. That's where Phil's    
      
   photon budget is either won or lost.    
   Is it reflectometry, and what is the set up? It sounds like you don't have   
   much    
   signal to work with.   
      
   j   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)