Doublet3_image.png

This is a technical specification drawing for a precision optical component, specifically a doublet lens assembly. The drawing, dated 12/15/2025 and drawn at a 3:1 scale, specifies three optical elements with the following dimensional and material requirements: a 10.269 CX radius element with 11.43 mm center aperture diameter and 12.700 mm edge diameter composed of N-FK51A material with 5.810 mm thickness (±0.05 mm tolerance); a 20.572 mm radius element with matching 11.43 mm center aperture and 12.700 mm edge diameter; and a 138.150 CC radius element in S-LAL8 material with 6.690 mm thickness (±0.05 mm tolerance).

The specification requires all dimensions in millimeters and mandates polish to a test plate with radius and irregularity of ±0.1 or 3 fringes. Surface quality specifications include irregularity of 0.25 waves peak-to-valley or 0.5 microns peak-to-valley, an anti-reflective coating on both sides with reflectance less than 0.5% across the 350–800 nm wavelength range, manufacturing per MIL-PRF-13830B with 60–40 scratch dig and surface roughness below 10 Angstrom RMS, and bevel specifications of 0.3–0.5 mm by 45 degrees or protective bevel as needed. The component measures 6.67 mm in one critical dimension.