From t-kimura@asahi-spectra.co.jp Mon May 3 05:27:55 2004 Date: Wed, 21 Apr 2004 18:11:08 +0900 From: Toshihiko Kimura To: Vikram Dhillon , Jorge Casares Subject: Observation Value [ The following text is in the "Windows-1252" character set. ] [ Your display is set for the "ISO-8859-1" character set. ] [ Some characters may be displayed incorrectly. ] Hi Dr.Vik / Dr.Jorge I send the data file of each filter. We measured them by Cary (Varian) spectrophotometer. Please check the attached file. 1.CIII/NIII+HeII I sent you e-mail 12 Feb.2004 --------------------------------------------------------------------------- > 0 degree f/2.3 > CWL 467.6nm 466nm > FWHM 11nm 11nm > > We can measure the filters only under the condition, 0 degree by Cary > spectrophotometer. (We cannot measure under f/2.3 !!) > So I would like to define the spec under 0 degree, > Target CWL 467.6nm +-1.5nm > Target FWHM 11nm +-1nm --------------------------------------------------------------------------- We measured each filter under 0 degree. No.1 => CWL 467.8nm FWHM 10.8nm No.2 => CWL 467.8nm FWHM 10.8nm In convergent beam F2.3, CWL will be shifted to 467.8-1.6=466.2nm CWL has been almost as same as target one. Peak transmission is much higher than I estimated before. 2.Red Continuum I sent you e-mail 19 Feb.2004 ------------------------------------------------ 0 degree f/2.3 CWL 601.9nm 600nm FWHM 1.7nm =>11.7nm 11.7nm Target FWHM 11nm +-1nm => 11.7 +-1nm ------------------------------------------------------ We measured each filter under 0 degree. No.1 => CWL 602.9nm FWHM 11.8nm No.2 => CWL 603.0nm FWHM 12.0nm In convergent beam F2.3, CWL will be shifted to 602.9-1.9=601nm 3.Optical Thickness I sent you e-mail 12 Feb.2004 --------------------------------------------------------------------------- Each substrate's thickness : CIII/NIII+HeII => Quartz(2 +0, -0.05mm) x 2 + BG39 (1.55 +0.05, -0.05mm) x1 Red Red Continuum => Quartz(2 +0, -0.05mm) x 2 + OG550 (1.55 +0.05, -0.05mm) x1 Note : We consider the optical thickness in terms of clear filters and f/2.3. But this is not perfect. We'll use three substates. It means the tolerance of polishing will be three times. Please understand you'll have to adjust the focus position, however you can avoid the situation, "out of focus completely". --------------------------------------------------------------------------- Each substrate meet the tolerance of physical thickness. Again, I don't think they are "perfect". You probably adjust the focus a little. I find the carton is still in Madrid at DHL web site. I hope it'll pass the custom as soon as possible. Thanks Toshihiko [ Part 2, Text/PLAIN (Name: "CIII NIII+HeII-1.txt") 4,001 lines. ] [ Unable to print this part. ] [ Part 3, Text/PLAIN (Name: "CIII NIII+HeII-2.txt") 4,001 lines. ] [ Unable to print this part. ] [ Part 4, Text/PLAIN (Name: "Red Continuum-1.txt") 4,001 lines. ] [ Unable to print this part. ] [ Part 5, Text/PLAIN (Name: "Red Continuum-2.txt") 4,001 lines. ] [ Unable to print this part. ] From t-kimura@asahi-spectra.co.jp Mon May 3 05:27:59 2004 Date: Wed, 21 Apr 2004 21:20:03 +0900 From: Toshihiko Kimura To: Jorge Casares Velazquez , Vik.Dhillon@sheffield.ac.uk Subject: Pbs Dr.Jorge > This is great Toshihiko, they fulfil the specifications, and with a very > high peak transmision! Thank you. I'm also happy. By the way please don't think our filters' attenuation from 900nm-1100nm is insufficient. This is beacuse of the ability of Pbs detector. In commercial spectrophotometer Pbs is usually used as NIR(near infrared) detector however the performance is not so good. Cary is reliable spectrophotometer but Pbs is also used. Needless to say photomultiplier detects from 300-900nm. It is very good to measure the signal at lower level. Toshihiko