Stable Optical Cavity Absolute Reference System

The U.S. Air Force intends to procure a highly specialized Stable Optical Cavity Absolute Reference System for precision laser stabilization. The requirement is being fulfilled through a sole‑source award to Stable Laser Systems (Boulder, CO) because no other commercial vendor can meet the exact specifications, which include dual‑wavelength operation (493 nm & 650 nm), ultra‑low drift (<0.1 MHz/day), vacuum housing to ≤10⁻⁷ Torr, and integrated temperature control and ion pump units. The solicitation is a notice of proposed contract action, not a competitive RFP; however, interested parties may submit capability statements. The award is anticipated on or before 30 Sep 2026. • Item 1: Cylinder cavity assembly with ULE glass spacer (50 mm × 100 mm) and high‑finesse mirrors (FSR 1.4‑1.6 GHz). • Item 2: Vacuum housing with Zerodur mounting block, AR‑coated windows, and pressure ≤10⁻⁷ Torr. • Item 3: Measurement of zero‑crossing temperature for the cavity. • Item 4: Temperature controller tuned to the measured zero‑crossing point. • Item 5: Ion pump system to achieve required vacuum level. The system is intended for high‑precision scientific/defense applications where wavelength stability is critical.