LSST Camera Filter Status

1. LSST Camera Filter Status

2. SDSS Band-pass Transition Half Maximum Transmission Wavelength (nm) g r i z Blue side 402 552 693 840 Red side 548 693 851 - LSST Band-pass Transition Half Maximum Transmission Wavelength (nm) u g r i z y1 y2 y3 Blue side 330400 552 691 818 960 970 970 Red side 400 552 691 818 922 1030 1020 1050 G-Balmer break @400. OI line@ 557 R-matches SDSS I-red side short of sky emission @826 Z-red side stop before H2O bands Y–options detailed

3. LSST Ideal Filters 100.0 80.0 60.0 Transmission u g r i z Y 40.0 20.0 0.0 300 400 500 600 700 800 900 1000 1100 1200 Wavelength (nm) Optical Design: Filter Reference Design • Filter band-pass characteristics are defined based on a combination of scientific considerations • 75 cm dia. • Curved surface • Filter is concentric about the chief ray so that all portions of the filter see the same angle of incidence range, 14.2º to 23.6º Uniform deposition required at 1% level over entire filter

4. LSST Filter Set

5. Filter prototype RFP going out to vendors • Discussions initiated with multiple vendors • JDS Uniphase • Infinite Optics • SAGEM • Barr • Goodrich • Asahi Spectra • Substantial industrial base exists to coat large, thin filters • Industry estimates of cost and schedule to coat these large, thin optics have been used as input for LSST camera optics schedule and budget • These estimates include a risk reduction study during the R&D phase 300cm coating chamber NOVA Laser Fusion Optics

6. Leak Update Orig Design Updated Design

7. Y-Band Options (Y2, Y3 and Y4)