We describe a simple method for measuring the radius of curvature by using Talbot interferometry in a noncollimated light beam. This scheme can also be used to determine the focal length of the collimating lens employed in the setup. Results of the measurements are presented. A discussion of achievable accuracies and the proper choice of parameters is included.
© 1992 Optical Society of America
Original Manuscript: November 20, 1990
Published: January 1, 1992
Kuppuswamy Venkatesan Sriram, Mahendra Prasad Kothiyal, and Rajpal Singh Sirohi, "Talbot interferometry in noncollimated illumination for curvature and focal length measurements," Appl. Opt. 31, 75-79 (1992)