Jean-Guy Moreau wrote: > Hi Mel, > > As you are the list administrator, i think this goes to you ;-) > > >Sender: malon@marilyn.uochb.cas.cz > >Date: Wed, 30 Sep 1998 15:16:48 +0200 > >From: Petr Malon <malon@uochb.cas.cz> > >MIME-Version: 1.0 > >To: Jean-Guy Moreau <jgmoreau@lino.com> > >Subject: Re: Open Sky Cooling was ATM dark ideas > > > >Jean-Guy Moreau wrote: > > > >> > I believe rock salt (NaCl) is transparent to infra red.... > >> >good luck making an optical window out of it though...... > >> > >> If i remember right, the IR spectroscopy guys use > >> sample cells made from two plates of polished LiCl, > >> the guy in the lab next to me was spending hours > >> polishing them, gloves, oil,CeO(?) and felt laps, water scared him like > >>hell ;-) > >> > >> Jean-Guy > >> > >> ******************************************************************* > >> " For things we have to learn before we can do them, > >> we learn by doing them" Aristotle > >> > >> Jean-Guy Moreau jgmoreau@mail.lino.com > >> 297 ch. des Feuillus http://lino.com/astro > >> Dubuisson, P. Quebec 77 Deg 53' W +48 Deg 04' N > >> Canada J9P 4N7 (819) 738-7512 > > > > Hellow Jean-Guy, I'm having difficulty posting to the list. May I ask you to > >kindly post the following for me? > >Regards, petr malon > > No, quartz is not transparent in this range. By far the best material is ZnSe > >(selenide of zinc), produced by Raytheon (I think). It is a yellow transparent > >glass like stuff, non toxic. Rather soft, can be cut with a sabre saw. > >Polishes > >well. High refractive index, needs coating. Lenses are generally available from > >II-VI company (in the U.S.). Fluorite can be used too (much more expensive) or > >multicoated polycrystalline germanium (fun stuff - can you imagine a lens which > >looks completely black?). > >petr malon > > > > ******************************************************************* > " For things we have to learn before we can do them, > we learn by doing them" Aristotle > > Jean-Guy Moreau jgmoreau@mail.lino.com > 297 ch. des Feuillus http://lino.com/astro > Dubuisson, P. Quebec 77 Deg 53' W +48 Deg 04' N > Canada J9P 4N7 (819) 738-7512 -- Clear skies, Mel Bartels http://www.efn.org/~mbartels
-- BEGIN included message
- To: mbartels@efn.org
- Subject: Re: Open Sky Cooling was ATM dark ideas
- From: jgmoreau@lino.com (Jean-Guy Moreau)
- Date: Wed, 30 Sep 1998 16:40:25 -0600
Hi Mel, As you are the list administrator, i think this goes to you ;-) >Sender: malon@marilyn.uochb.cas.cz >Date: Wed, 30 Sep 1998 15:16:48 +0200 >From: Petr Malon <malon@uochb.cas.cz> >MIME-Version: 1.0 >To: Jean-Guy Moreau <jgmoreau@lino.com> >Subject: Re: Open Sky Cooling was ATM dark ideas > >Jean-Guy Moreau wrote: > >> > I believe rock salt (NaCl) is transparent to infra red.... >> >good luck making an optical window out of it though...... >> >> If i remember right, the IR spectroscopy guys use >> sample cells made from two plates of polished LiCl, >> the guy in the lab next to me was spending hours >> polishing them, gloves, oil,CeO(?) and felt laps, water scared him like >>hell ;-) >> >> Jean-Guy >> >> ******************************************************************* >> " For things we have to learn before we can do them, >> we learn by doing them" Aristotle >> >> Jean-Guy Moreau jgmoreau@mail.lino.com >> 297 ch. des Feuillus http://lino.com/astro >> Dubuisson, P. Quebec 77 Deg 53' W +48 Deg 04' N >> Canada J9P 4N7 (819) 738-7512 > > Hellow Jean-Guy, I'm having difficulty posting to the list. May I ask you to >kindly post the following for me? >Regards, petr malon > No, quartz is not transparent in this range. By far the best material is ZnSe >(selenide of zinc), produced by Raytheon (I think). It is a yellow transparent >glass like stuff, non toxic. Rather soft, can be cut with a sabre saw. >Polishes >well. High refractive index, needs coating. Lenses are generally available from >II-VI company (in the U.S.). Fluorite can be used too (much more expensive) or >multicoated polycrystalline germanium (fun stuff - can you imagine a lens which >looks completely black?). >petr malon > ******************************************************************* " For things we have to learn before we can do them, we learn by doing them" Aristotle Jean-Guy Moreau jgmoreau@mail.lino.com 297 ch. des Feuillus http://lino.com/astro Dubuisson, P. Quebec 77 Deg 53' W +48 Deg 04' N Canada J9P 4N7 (819) 738-7512
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