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This is a technical drawing specification for optical components known as "Doublet 1," dated December 15, 2025, drawn at a 2:1 scale. The document specifies the manufacture of precision optical doublets with three distinct radius configurations: 55.393 mm CX, 36.115 mm, and 124.992 mm CX, each with a 20.0 mm center aperture diameter (C.A. DIA).

The components require N-FK51A and S-LAL8 materials with edge diameters of 25.400 mm and thicknesses of 5.780 mm and 6.000 mm respectively, each with tolerance of +/-0.05 mm. Manufacturing specifications mandate compliance with MIL-G-174B for material standards and MIL-PRF-13830B for production, including pitch polish to a test plate with radius tolerance of +/-0.1% or 3 feet and irregularity tolerance of 0.25 waves PV. Additional requirements include anti-reflective coating on both sides with reflectance less than 0.5% across the 350-800 nm wavelength range, 60-40 scratch-dig surface finish, surface roughness below 10 Angstrom RMS, and beveled edges at 0.3-0.5 mm by 45 degrees. The drawing indicates a 10.00 mm reference dimension and includes provisions for protective beveling as needed.