title: Quantitative test for concave aspheric surfaces using a Babinet compensator.
abstract: A quantitative test for the evaluation of surface figures of concave aspheric surfaces using a Babinet compensator is reported. A theoretical estimate of the sensitivity is 0.002lambda for a minimum detectable phase change of 2 pi x 10(-3) rad over a segment length of 1.0 cm.
authors.forename: A K
authors.initials: AK
authors.lastname: Saxena