From: pcdhSpamMeSenseless@electrooptical.net   
      
   On 12/07/2015 08:12 PM, ggherold@gmail.com wrote:   
   > On Monday, December 7, 2015 at 4:18:28 PM UTC-5, Phil Hobbs wrote:   
   >> Hi, all,   
   >>   
   >> Back in the day, Corning used to make sharp-cut red filters with   
   >> spectacularly low autofluorescence compared with Hoya and Schott ones.   
   >> H & S seem to light up like a Christmas tree at a wavelength about   
   >> 50-100 nm to the red of the edge, which is very inconvenient at the moment.   
   >>   
   >> Corning doesn't make coloured glass filters any more.   
   >>   
   >> Two questions for the assembled multitude:   
   >>   
   >> 1. Does anyone know who they sold the line to. if anybody, and if   
   >> they're still available?   
   >>   
   >> 2. Any wisdom on 800-nm-ish sharp cut longpass filters with super low   
   >> autofluorescence?   
   >>   
   >> Thanks   
   >>   
   >> Phil Hobbs   
      
   > How much money, how many, size?   
   > (my first hit on Thor labs was a $73   
   > 1" (?) piece, )   
   > I get big interference filters from Custom Scientific, AZ,   
   > for less than that, (per area.)   
   > (I only mention them selfishly, 'cause I want   
   > them to be around ~5 years from now, depending on sales.)   
   >   
   > If you want just absorbing glass,   
   > (like for an argon laser into a spectrometer)   
   > what's the intensity? (maybe china?, I dunno)   
   > At the very low end,   
   > I've got plastic filter samples for lighting,   
   > Lee filters, with transmission vs wavelength plots.   
   >   
   > George H.   
   >   
      
   Needs to be super cheap.  So cheap that we're looking at choosing   
   fluorophores and pump sources so that we can use just the IR-filtered   
   photodiode to get rid of the pump light.   
      
   Black glass or more IR-absorbing plastic would be fine if it doesn't   
   fluoresce much.   
      
   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   
      
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