|標題:||Full-field refractive index distribution measurement of a gradient-index lens with heterodyne interferometry|
Department of Photonics
|關鍵字:||GRIN lens;heterodyne interferometry;full-field measurement;refractive index;sine wave fitting algorithm|
|摘要:||A light beam coming from a circular heterodyne light source with an electro-optic modulator is incident on a gradient-index lens obliquely. The reflected light passes through an analyzer and an imaging lens, and is recorded by a fast CMOS camera. A group of periodic sinusoidal segments recorded by each pixel is modified, and its associated phase is derived with a unique technique. The processes are applied to other pixels; the two-dimensional phase distribution can be obtained similarly. The estimated data are substituted into the special equations derived from Fresnel's equations, and the full-field refractive index distribution of the gradient-index lens can be obtained. This method has the merits of both common-path interferometry and heterodyne interferometry.|
|期刊:||MEASUREMENT SCIENCE & TECHNOLOGY|
|Appears in Collections:||Articles|
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