分光鏡
2"平板分光鏡
Model: BS20
Material: BK7
Diameter: 50.8+0/-0.1 mm
Thickness: 7±0.2 mm
Parallelism: < 3 arc min.
Clear Aperture: >80%
Surface Quality: 60-40
Surface Flatness: λ/4 @ 633 nm
S1: Coating Type: PR R=50% @430-680 nm, AOI=45º
S2: Coating Type: AR @430-680nm
