Measurement of the diffraction-limit wavefront with double-shearing interferometers
Data(s) |
2006
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Resumo |
In order to measure the diffraction-limit wavefront, we present three types of common-path double-shearing interferometers based on the theory of double shearing. Two pairs of half-aperture or whole-aperture wedge plates are used to introduce opposite tilt to realize the double-shearing function. By comparing the fringe widths in two fields, the marginal wavefront aberration can be obtained. In the paper, we give three different configurations: half-aperture configuration, whole-field configuration and double-interferometer configuration. The half-aperture configuration has the features of high sensitivity, stabilization and easy alignment. For the whole-field configuration, the interference fringes are displayed in two whole fields. Consequently, the divergent or convergent characteristic and aberration types of a wavefront can be identified visually. The whole-field configuration can be changed to the double-interferometer configuration for continuous test. Both small and large wavefront aberrations can be measured by the double-interferometer configuration. The minimum detectable wavefront aberration (W-0)(min) comes to 0.03 lambda. Lastly, we present the experimental results for the three types of double-shearing interferometers. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
Xu RW;栾竹;Liu HZ;刘立人.,J. Opt. A-Pure Appl. Opt.,2006,8(2):164-171 |
Palavras-Chave | #shearing interferometer #diffraction limit #double shearing #wedge plate #common-path |
Tipo |
期刊论文 |