Programmable Adaptive Metrology for Conformal Optics Testing

To address the Navy need for measuring optical figures on an aspheric dome and the associated corrector optics, Physical Optics Corporation (POC) proposes to develop a new programmable adaptive metrology (PAM) for aspheric, nonaxially (nonrotationally) symmetric, conformal optical surfaces. Current interferometry techniques have limitations on testing strong aspheres and optical domes. Recent efforts have extended metrology capabilities to optics with departures from a best-fit sphere of 50-100 microns. The PAM system will be capable of measuring conformal domes and optics with departures from a best-fit sphere of millimeters. In Phase I POC will demonstrate the feasibility of PAM via a subscale prototype and associated algorithms on material such as glass or fused silica. A clear path to scale the approach to larger sizes and infrared-transparent materials in Phase II will be planned. In Phase II POC will develop a prototype for robust, reliable operation in the required operational environments, and to demonstrate the capability to measure the steeper aspheres and conformal optics on infrared-transparent materials, and with sizes up to 200 x 200 mm. The final optical figure should be within 0.1 wavelength root-mean-square deviation at 633 nm over the full clear aperture of the part.