From chris.pietraszewski@icopticalsystems.com Wed Oct 31 17:04:41 2007 Date: Wed, 31 Oct 2007 17:05:02 -0000 From: Chris Pietraszewski To: Vik Dhillon Subject: 2415 Quotation for the manufacture of 2 mounted Grism assemblies Hi Vik,   Please find attached our quotation for the two grism assemblies that we have been discussing. Also I have attached a short description of the coating curves offered by the coating supplier. The AR coatings are astonishing in their performance in reducing the reflection from the uncoated surfaces from ~10% to <0.5% on average over the two wavelength bands.   The price overall is a little higher than originally estimated since the two wavelength ranges are best served by two separate coatings. It will still be possible to have a quick turn round time by hand carrying the prisms to the coaters. The quote includes an estimate of the cost of hand carrying which may or may not be accurate, but we will not make any additional claims for expenses should you place the order - I will regard extra expenses as my responsibility as part of my day out of the office!   We have offered two separate coatings as they will give the better performance for each grating. I think that this is the better choice than a compromise single coating since these grisms will, hopefully, have a long and productive life and the additional cost of a second coating run would not amount to a huge saving.   I am attaching the N-SF66 data sheet for interest - you can see how the refractive index varies across the wavelength ranges of interest.   Please let me know as soon as possible if you want us to proceed as the delivery date is looming very quickly and each day lost now will add to the pressure on all concerned.   I look forward to your instructions with anticipation. Regards, Chris Pietraszewski, PhD IC Optical Systems Ltd 190-192 Ravenscroft Road Beckenham, Kent BR3 4TW United Kingdom Tel:  +44 (0) 20 8778 5094 Fax: +44 (0) 20 8676 9816 E-mail: chris.pietraszewski@icopticalsystems.com URL: IC Optical Systems Ltd Registered in England, number 4277655, at 190-192 Ravenscroft Road, Beckenham, Kent BR3 4TW   This e-mail (including any attachments) is intended only for the recipient(s) named above. It may contain confidential or privileged information and should not be read, copied or otherwise used by any other person. If you are not a named recipient, please contact the sender and delete the e-mail from your system. You must not copy or disclose the contents of this e-mail or any attachments to any other person. Any views expressed in this message are those of the individual sender and may not necessarily reflect the views of IC Optical Systems Ltd.   E-mails are not secure and may contain viruses or error since they can, for example, be intercepted, amended or lost. These risks are deemed accepted by everyone who communicates with us by e-mail.   [ Part 2, "2415 Grisms VDhillon Sheffield.pdf" ] [ Application/OCTET-STREAM (Name: "2415 Grisms VDhillon ] [ Sheffield.pdf") 426KB. ] [ Unable to print this part. ] [ Part 3, "Theoretical ARC Transmission on N-SF66.pdf" ] [ Application/OCTET-STREAM (Name: "Theoretical ARC Transmission on ] [ N-SF66.pdf") 199KB. ] [ Unable to print this part. ] [ Part 4, "N-SF66_datasheet.pdf" Application/OCTET-STREAM (Name: ] [ "N-SF66_datasheet.pdf") 164KB. ] [ Unable to print this part. ]