From t-kimura@asahi-spectra.co.jp Mon Dec 18 03:55:48 2006 Date: Mon, 18 Dec 2006 13:55:10 +0900 From: Toshihiko Kimura To: Jorge Casares Velazquez , Vik Dhillon Cc: Danny Steeghs Subject: Measured data(Halpha/Blue continuum) Dear Dr.Jorge, Dr.Vik, I send you all of the actual transmission data. Please check the attached text file. Regarding the filter number, the label on individual package shows each filter name and filter number, "No.1" "No.2". The specifications and actual CWL and FWHM in collimated beam are as follows. Specifications ------------------------------------------------------------------- > [Halpha] > CWL 658.5nm (+2.3nm) in collimated beam > => CWL 656.2nm in ULTRACAM's f/2.3 converging beam > -FWHM 10nm +/-1nm in f/2.3 beam. > -Estimated peak transmission > 85% > -Blocking range 300-1100nm T< 0.1% > [Blue continuum] > > CWL 516.8nm (+1.8nm) in collimated beam > => CWL 515nm in ULTRACAM's f/2.3 converging beam > OK, we will make your blue continuum filters with the design, FWHM 16nm. (+/-2nm) > -Estimated peak transmission > 80% > -Blocking range 300-1100nm T< 0.1% ------------------------------------------------------------------- [Halpha] No.1 CWL 657.5nm FWHM 9.4nm in collimated beam => CWL 655.2nm in ULTRACAM's f/2.3 converging beam No.2 CWL 657.7nm FWHM 9.4nm in collimated beam => CWL 655.4nm in ULTRACAM's f/2.3 converging beam [Blue continuum] No.1 CWL 516.6nm FWHM 15.6nmin collimated beam => CWL 514.8nm in ULTRACAM's f/2.3 converging beam No.2 CWL 516.7nm FWHM 15.8nm in collimated beam => CWL 514.9nm in ULTRACAM's f/2.3 converging beam > Dear Dr.Vik, > > We have supplied both CIII/NIII+HeII and Red continuum filters > in 2004. > Our optical engineer wants to know whether they were good or not > in terms of "same optical thickness". > > He has changed calculated optical thickness very slightly this time, > because he could check Zemax file. Zemax data is important information > for him and it enables him to find the best optical thickness. > Though his calculation is "theoretically the best", the problem is that > he cannot confirm it is the best or not by his own eyes. > So he wants to know the result of previous filters. Regarding the optical thickness, please tell me the result of both CIII/NIII+HeII/Red continuum and Halpha/Blue continuum filters later. I appreciate you gave us the chance again to supply filters for ULTRACAM. I hope our filters will be able to help your research. Best regards, Toshihiko [ Part 2, Text/PLAIN (Name: "Blue continuum-2.txt") 4,001 lines. ] [ Unable to print this part. ] [ Part 3, Text/PLAIN (Name: "Blue continuum-1.txt") 4,001 lines. ] [ Unable to print this part. ] [ Part 4, Text/PLAIN (Name: "Halpha-2.txt") 4,001 lines. ] [ Unable to print this part. ] [ Part 5, Text/PLAIN (Name: "Halpha-1.txt") 4,001 lines. ] [ Unable to print this part. ]