From: Toshihiko Kimura <t-kimura@asahi-spectra.co.jp> Date: 23 May 2017 at 03:41 Subject: Actual transmission curve(Super SDSS u'-band filter) To: Vik Dhillon <vik.dhillon@sheffield.ac.uk> Dear Prof. Dhillon, Next, Super SDSS u'-band filter -------------------------------------- [u'-band] > Red wing of u' requires a +1nm shift. In a collimated beam at AOI 0 degree, Cut-on wavelength: No specification Cut-off wavelength: 391 nm (i.e. 390 nm + 1 nm) +4/-4 nm CUT-OFF WAVELENGTH CONFIRMED. > FOR CUT-ON WAVELENGTH, YOU SAY "NO SPECIFICATION", > BUT I WOULD LIKE IT TO BE AS BLUE AS POSSIBLE. PLEASE > COULD I PROPOSE: "NOT REDDER THAN 311nm" ? Cut-on wavelength: around 311 nm or so "Around 311nm" is fine with me, so that is also confirmed. -------------------------------------- Actual cut-on wavelength was approximately 309.5 nm, and cut-off was approximately 392 nm. Cut-on wavelength, 309.5 nm means *bluer* (i.e. not redder) than 311 nm as you requested. Actual transmission in u'-passband surpasses our suggested, "T > 85%". Regards, Toshihiko -------------------------------------- [HiPERCAM u' filter] Cut-on wavelength tolerance: +4 nm, -6 nm Cut-on wavelength tolerance: +/-4 nm T > 85% or over in passband T (average) < 0.01% 300 nm - 1000 nm T < 0.1% 300 nm - 1100 nm From: Toshihiko Kimura Sent: Tuesday, May 23, 2017 11:22 AM To: Vik Dhillon Subject: Actual transmission curve(Super SDSS g'-band filter) Dear Prof. Dhillon, I will send the actual transmission curve of Super SDSS g'-band filter today. -------------------------------------- [g'-band] > Blue wing of g' requires NO shift. > Red wing of g' requires a -1nm shift. In a collimated beam at AOI 0 degree, Cut-on wavelength: 400 nm +5/-5 nm Cut-off wavelength: 549 nm (i.e. 550 nm - 1 nm) +5/-5 nm CONFIRMED. -------------------------------------- Actual cut-on wavelength was approximately 398 nm, and cut-off was approximately 547.5 nm. Both wavelengths completely meet our final agreement. Actual transmission in g'-passband surpasses "T(average) > 95%" we suggested last year as well as r', i', z'-band. Best regards, Toshihiko -------------------------------------- [HiPERCAM g' ~ z' filter] Cut-on and off wavelength tolerance: each +/-5 nm T(average) > 95% or over in passband T > 90% in passband (i.e. valley of ripple must not be less than 90%) T (average) < 0.01% 300 nm - 1100 nm T < 0.1% 300 nm - 1100 nm From: Toshihiko Kimura Sent: Thursday, May 18, 2017 4:13 PM To: Vik Dhillon Subject: Actual transmission curve(Super SDSS z'-band filter) Dear Prof. Dhillon, Today, Super SDSS z'-band. -------------------------------------- [z'-band] > I make the T50% wavelength 833.29nm, so rounded to 833nm, > not 834nm as you have specified. Please could you confirm this? In a collimated beam at AOI 0 degree, Cut-on wavelength: 833 nm +5/-5 nm Good - so that is confirmed then. -------------------------------------- Actual cut-on wavelength was approximately 830.5 nm. It meets our final agreement. Regards, Toshihiko From: Toshihiko Kimura Sent: Wednesday, May 17, 2017 7:16 PM To: Vik Dhillon Subject: Actual transmission curve(Super SDSS i'-band filter) Dear Prof. Dhillon, I will send the actual transmission curve of Super SDSS i'-band filter today. -------------------------------------- [i'-band] > Blue wing of i' requires NO shift. > Red wing of i' requires a +5nm shift. In a collimated beam at AOI 0 degree, Cut-on wavelength: 695 nm +5/-5 nm Cut-off wavelength: 841 nm (i.e. 836 nm + 5 nm) +5/-5 nm CONFIRMED. -------------------------------------- Actual cut-on wavelength was approximately 697.5 nm, and cut-off was approximately 844 nm. Both wavelengths meet our final agreement. The shape of i'-band passband is the best one that I have ever seen, even "beautiful"! Thanks, Toshihiko From: Toshihiko Kimura Sent: Monday, May 15, 2017 11:53 AM To: Vik Dhillon Subject: Actual transmission curve(Super SDSS r'-band filter) Dear Prof. Dhillon, I will send the actual transmission curve of all the Super SDSS filters with Excel format from today, first, r'-band. Two filters (for HiPERCAM and ULTRACAM) were ordered in each u' ~ z' band. Each two filters were coated together by the same production lot. I remember you stopped by our booth at SPIE meeting in Edinburgh, and found the poster, "HSC (600 mm) r'-band transmission curve". (I suppose that it would be a motivation for you to decide the order) The coating result of Super SDSS r' was equivalent to the HSC r'. -------------------------------------- [r'-band] > Blue wing of r' requires NO shift. > Red wing of r' requires NO shift. In a collimated beam at AOI 0 degree, Cut-on wavelength: 550 nm +5/-5 nm Cut-off wavelength: 686 nm +5/-5 nm CONFIRMED. -------------------------------------- Actual cut-on wavelength was approximately 551 nm, and cut-off was approximately 688 nm (688.25 nm). Both wavelengths meet our final agreement. 632.8 nm of our Zygo laser interferometer can transmit through only r'-band filter. I will send the transmitted wavefront data of r' filters later. Sincerely, Toshihiko