Annex C - Flat Mirrors Specifications
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Item Requirement Requested Value/ Quality Verification Method R = Revision I = Inspection T = Test Large Aperture Flat mirror for LBTS Flat. 1 Material for mirror substrate Material with activation equal or lower than Fused silica R Flat. 2 Mirror Size * (mm) H = 650 L = 880 X = 630 Y = 860 T- Supplier R - Purchaser Flat. 3 Scratch-Dig Better than 20-10 as per MIL-O-13830A T- Supplier R - Purchaser Flat. 4 Reflectivity >98.5% (45 degree angle of incidence and P polarization ) T Flat. 5 Vacuum Compatibility (mbar) <10 -6 T- Supplier R - Purchaser Flat. 6 LIDT (Laser Induced Damage Threshold) 0% damage probability >0.4 J/cm^2 @800nm, for <50fs pulse @ laser repetition rate at least 10Hz T- Supplier R - Purchaser Flat. 7 GDD (Group delay dispersion) In order to satisfy the requirement Diag 1.2. from Annex J T- Supplier R - Purchaser Documents for commissioning ComFlat. 1 Dimensional report of optics Compliance R ComFlat. 2 Reflectivity Trace showing compliance of reflectivity at requested polarization in vacuum. Trace will be taken on a 1” sample traceable to the mirror. Compliance R ComFlat. 3 Interferogram data of clear aperture of optic after coating Compliance R ComFlat. 4 GDD measurement for witness samples traceable to the mirror Compliance R ComFlat. 5 Damage test reports for a number of 4 witness sample for each coating batch, to demonstrate that it reaches >0.4J/cm 2 , 0% damage probability @800nm, for <50fs pulse @ laser repetition rate at least 10Hz, S on one for S=1000. Witness shall be traceable to the mirror. The damage test shall be performed at 2 independent facilities (2 samples for each). Compliance R ComFlat. 6 Ellipsometric polarization curve measurement shall be provided, for each coating batch, for one witness sample traceable to the mirror. Compliance R ComFlat. 7 Certificate of Conformity Compliance R * Mirror dimensions in relation with the definition of the clear aperture in Clear Aperture sheet
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Transcript of Annex C - Flat Mirrors Specifications
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Item Requirement Requested Value/ Quality
Verification
Method
R = Revision
I = Inspection
T = Test
Large Aperture Flat mirror for LBTS
Flat. 1 Material for mirror substrate Material with activation equal or lower than Fused silica R
Flat. 2 Mirror Size * (mm)
H = 650
L = 880
X = 630
Y = 860
T- Supplier
R - Purchaser
Flat. 3 Scratch-Dig Better than 20-10 as per MIL-O-13830AT- Supplier
R - Purchaser
Flat. 4 Reflectivity >98.5% (45 degree angle of incidence and P polarization ) T
Flat. 5 Vacuum Compatibility (mbar) 0.4 J/cm^2 @800nm, for 0.4J/cm2 , 0% damage probability @800nm, for
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Red area is the clear aperture of the mirror
L
H
