Use of self-focusing for measurements of ultrasmall (less than lambda/3000) wave-front distortions

摘要

Results of the use of self-focusing in Kerr liquids for the measurement of small wave-front distortions transmitted through a transparent optical sample are presented. Using controlled self-focusing to decrease the spot size of the deflected beam, we have been able to improve the measurement resolution by an order of magnitude compared with that achieved with a conventional Hartmann detector, We examine a variety of materials to determine the optimal nonlinear medium and demonstrate measurements of absolute wave-front deviations at the level of lambda/3000. A prototype of a new device, the scanning nonlinear Hartmann sensor, is described. (C) 2002 Optical Society of America. [References: 11]