Big BOSS Gratings Dichroic Filter Specifications J Edelstein

Big. BOSS Gratings & Dichroic Filter Specifications J. Edelstein 16 dec 2012

GRATING Specifications Operating Mode Transmission Diffracted Wavefront Distortion (at 632. 8 nm) 1/2 waves P-V @ 632. 8 nm in Clear Aperture Physical Dimensions (mm) (Height x Width x Thickness) 160 x 180 (± 0. 2) mm x 16 (± 0. 1) mm Long dimension parallel to grating vector Grating Aperture Centered to (± 0. 75) mm Surface Finish (Scratch/Dig) 60/40 Substrate Face Wedge < 10 arcsec Grating Substrate-Substrate Wedge < 20 arcsec Substrate Roughness < 10 Å RMS Substrate Material Fused Silica HPSF 7980, Inclusion Grade 0, Homogeneity Grade F, or equivalent. Birefringence < 10 nm/cm Edges Break all edges 0. 75 +- 0. 25 mm. Chips < 0. 7 mm in any plane. Grind 220 grit or similar

clear area bounds Substrate Description Serialize Mark Max Clear aperture Red grating + 1. 5 mm radius tolerance for recording and installation tolerance minimum clearance to L, R edge 8. 8 mm minimum clearance to T, B edge 18. 8 mm Mark Blaze Direction

BLUE GRATING Operating Wavelengths (nm) 360 - 593 nm Fringe Frequency (Grating Frequency) 1103. 5 ± 2 l/mm Angle of Incidence (AOI) from Normal -10. 46 o Fringe Angle FA calculated @ n=1. 49 gelatin is -3. 18 o Efficiency Optimization Goal Both band edges > 65% Grating Clear Aperture 136. 4 mm diameter AOI ± 1° to optimize efficiency RED GRATING Operating Wavelengths (nm) 566 - 772 nm Fringe Frequency (Grating Frequency) 1157. 4 ± 2 l/mm Angle of Incidence (AOI) from Normal -18. 12 o Fringe Angle (FA) FA calculated @ n=1. 49 gelatin is -3. 03 o Efficiency Optimization Goal Both band edges > 80%. Grating Clear Aperture 140. 6 mm diameter NIR GRATING Operating Wavelengths (nm) 747 - 980 nm Fringe Frequency (Grating Frequency) 992. 5 ± 2 l/mm Angle of Incidence (AOI) from Normal -20. 76 o Fringe Angle (FA) FA calculated @ n=1. 49 gelatin is -2. 97 o Efficiency Optimization Goal Both band edges > 80%. Grating Clear Aperture 142. 5 mm diameter alpha_o is angle of incidence AOI phi is Fringe Angle FA

Dichroic Filters Specifications Dichroic Filter Performance Incident Angle, In-Plane deg A. 30 deg A. 25 deg +- 0. 2 Incident Angle, Out of Plane deg +- 7. 5 deg +- 0. 2 Dichroic Band Reflection, R nm 360 -566 nm 580 -747 nm >95% P-S average Dichroic Band Transmission, T nm 593 -980 nm 772 -980 nm >95% P-S average Crossover Region, sum of Reflection + Transmission nm 566 - 593 nm 747 - 772 nm >95% P-S average

Dichroic Substrate Description clear area bounds Serialize Mark example, Blue Option A. minimum clearance to L, R edge 10 mm minimum clearance to T, B edge 10 mm Serialize Mark