LENS 1

Central thickness	4mm Radius 1	50.088mm Radius 2	57.687mm Diameter	25mm

Material:	IR grade CaF2 Surface Figure:	λ/20 at 633nm – Document and report final	figure. Radius Tolerance	± 0.06% Surface Quality:	60-40 Surface finish:	micro ripple 1nm RMS or better. Document	and report measured values. Diameter Tolerance:	+0/- 0.1mm Thickness Tolerance:	± 0.075mm. Report to ±0.010mm Concentricity:	± 0.013mm maximum runout. Report	measured value. Bevel:	0.25mm at 45° Clear Aperture	Exceeds central 90% of dimension Coating:	AR 1-2.4μm coating

LENS 2

Central thickness	3mm Radius 1	43.466mm Radius 2	112.715mm Diameter	25mm

Material:	IR grade Fused Silica Surface Figure:	λ/20 at 633nm – Document and report final	figure. Radius Tolerance	± 0.06% Surface Quality:	60-40 Surface finish:	micro ripple 1nm RMS or better. Document	and report measured values. Diameter Tolerance:	+0/- 0.1mm Thickness Tolerance:	± 0.075mm. Report to ±0.010mm Concentricity:	± 0.013mm maximum runout. Report	measured value. Bevel:	0.25mm at 45° Clear Aperture	Exceeds central 90% of dimension Coating:	AR 1-2.4μm coating

Nathalie Thureau, University of Michigan, Astronomy Dpt, 913 Dennison building, 500 Church St, Ann Arbor, MI 48109.

2005-01-26T14:29:00