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ao:dichroic_specification [2018/07/07 09:17]
jones [Note and Files] 		ao:dichroic_specification [2018/07/07 09:22] (current)
jones [Finished beam splitter transmission/reflection curves received from vendor Uploaded 2013-10-31]
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 | Image shift (60 degrees from zenith, arcsec)\\ | 1.64\\ | 0.87\\ | 0.44\\ | 0.18\\ | 0\\ | | Image shift (60 degrees from zenith, arcsec)\\ | 1.64\\ | 0.87\\ | 0.44\\ | 0.18\\ | 0\\ |
  These two tables, taken together, imply that for a 500nm dichroic short-wave cutoff (with respect to a 400nm cutoff), there would be a 0.06 mag sensitivity loss at zenith, and a sensitivity gain at higher airmasses. A 600nm dichroic short-wave cutoff (with respect to a 500nm cutoff) loses an additional 0.12 mags sensitivity at zenith and doesn't cause a sensitivity gain until high airmass.\\ \\  On the basis of this study MJI suggests specifying a dichroic with a reflection band of 0.55 to 1.0 microns, and a transmission band of 1.15 to 2.4 microns. State that we intend to use some of the transmitted light short-wards of 0.55 microns, and would like to know the predicted curve down to 0.4 microns.\\ \\ \\ \\   These two tables, taken together, imply that for a 500nm dichroic short-wave cutoff (with respect to a 400nm cutoff), there would be a 0.06 mag sensitivity loss at zenith, and a sensitivity gain at higher airmasses. A 600nm dichroic short-wave cutoff (with respect to a 500nm cutoff) loses an additional 0.12 mags sensitivity at zenith and doesn't cause a sensitivity gain until high airmass.\\ \\  On the basis of this study MJI suggests specifying a dichroic with a reflection band of 0.55 to 1.0 microns, and a transmission band of 1.15 to 2.4 microns. State that we intend to use some of the transmitted light short-wards of 0.55 microns, and would like to know the predicted curve down to 0.4 microns.\\ \\ \\ \\ 
-===== **Coating specifications** =====+===== Coating specifications =====
 \\ We agreed to send the following coating specifications to vendors in October, 2012\\  There will be two sets of beam splitters, YSO and VIS, on IR grade low-OH fused silica substrates. \\  The requirements for the coatings are as follows:\\ \\ __YSO dichroic – 6 pieces:__\\  AOI 10 degrees\\  Non polarizing\\  Surface 1: In the spectral range of 600 to 1000 nm it should reflect as much as possible, and in the range of 1100 to 2400 nm transmit as much as possible.\\  Surface 2: Antireflection coating for 1100 to 2400 nm\\ We would also like to know the predicted curve down to 400 nm.\\ \\ __VIS dichroics – 6 pieces:__\\  AOI 10 degrees\\  Non polarizing\\  Surface 1: In the spectral range of 600 to 1000 nm a gray split: R~20% T~80%,\\  in the 1100 to 2400 nm range it should transmit as much as possible.\\  Surface 2: Antireflection coating for 1100 to 2400 nm\\ We would also like to know the predicted curve down to 400 nm.\\ \\  \\ We agreed to send the following coating specifications to vendors in October, 2012\\  There will be two sets of beam splitters, YSO and VIS, on IR grade low-OH fused silica substrates. \\  The requirements for the coatings are as follows:\\ \\ __YSO dichroic – 6 pieces:__\\  AOI 10 degrees\\  Non polarizing\\  Surface 1: In the spectral range of 600 to 1000 nm it should reflect as much as possible, and in the range of 1100 to 2400 nm transmit as much as possible.\\  Surface 2: Antireflection coating for 1100 to 2400 nm\\ We would also like to know the predicted curve down to 400 nm.\\ \\ __VIS dichroics – 6 pieces:__\\  AOI 10 degrees\\  Non polarizing\\  Surface 1: In the spectral range of 600 to 1000 nm a gray split: R~20% T~80%,\\  in the 1100 to 2400 nm range it should transmit as much as possible.\\  Surface 2: Antireflection coating for 1100 to 2400 nm\\ We would also like to know the predicted curve down to 400 nm.\\ \\ 
 ==== Finished beam splitter transmission/reflection curves received from vendor Uploaded 2013-10-31 ==== ==== Finished beam splitter transmission/reflection curves received from vendor Uploaded 2013-10-31 ====
-[[/file/view/AO-VISsplitter.PDF/464996256/AO-VISsplitter.PDF|{{http://www.wikispaces.com/i/mime/32/application/pdf.png?32x32|AO-VISsplitter.PDF}}]][[/file/view/AO-VISsplitter.PDF/464996256/AO-VISsplitter.PDF|AO-VISsplitter.PDF]]\\ +{{ao:AO-VISsplitter.PDF|AO-VISsplitter.PDF}}\\  
 +{{ao:AO-YSOsplitter.PDF|AO-YSOsplitter.PDF}}\\ 
  
-  * [[/file/detail/AO-VISsplitter.PDF|Details]] 
-  * [[/file/view/AO-VISsplitter.PDF/464996256/AO-VISsplitter.PDF|Download]] 
-  * 69 KB 
-\\ [[/file/view/AO-YSOsplitter.PDF/464996230/AO-YSOsplitter.PDF|{{http://www.wikispaces.com/i/mime/32/application/pdf.png?32x32|AO-YSOsplitter.PDF}}]][[/file/view/AO-YSOsplitter.PDF/464996230/AO-YSOsplitter.PDF|AO-YSOsplitter.PDF]]\\  
- 
-  * [[/file/detail/AO-YSOsplitter.PDF|Details]] 
-  * [[/file/view/AO-YSOsplitter.PDF/464996230/AO-YSOsplitter.PDF|Download]] 
-  * 70 KB 
ao/dichroic_specification.1530969431.txt.gz · Last modified: 2018/07/07 09:17 by jones

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