Collimation method that uses spiral gratings and Talbot interferometry
نویسندگان
چکیده
منابع مشابه
Collimation method that uses spiral gratings and Talbot interferometry.
The tested light is projected onto an arrangement composed of two special spiral gratings, in which the second spiral grating is positioned at the Talbot image of the first one. From the shapes of the resultant moiré fringes, the quality of collimation of the tested light can be easily checked.
متن کاملImproved collimation testing using Talbot interferometry.
Several schemes for checking collimation of a light beam based on the self-imaging (Talbot effect) combined with the moire technique have been described. When a grating is illuminated by a collimated beam of monochromatic light, exact self-images of the grating are formed at certain welldefined planes perpendicular to the direction of the beam. The moire pattern is observed by placing an identi...
متن کاملTalbot images of wavelength-scale amplitude gratings.
By means of experiment and simulation, we achieve unprecedented insights into the formation of Talbot images to be observed in transmission for light diffracted at wavelength-scale amplitude gratings. Emphasis is put on disclosing the impact and the interplay of various diffraction orders to the formation of Talbot images. They can be manipulated by selective filtering in the Fourier plane. Exp...
متن کاملIntegrated-optic dispersion compensator that uses chirped gratings.
An integrated-optic dispersion compensator that uses chirped waveguide gratings is designed and fabricated. The 7-mm-long chirped grating is realized by a recently proposed method of curving a waveguide through a uniform grating. At 800 nm, the fabricated device exhibits a reflection bandwidth in excess of 0.5 nm and a nearly quadratic phase response corresponding to a fiber dispersion–length p...
متن کاملElectron interferometry with nano-gratings
We present an electron interferometer based on near-field diffraction from two nanostructure gratings. Lau fringes are observed with an imaging detector, and revivals in the fringe visibility occur as the separation between gratings is increased from 0 to 3 mm. This verifies that electron beams diffracted by nanostructures remain coherent after propagating farther than the Talbot length zT = 2d...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Optics Letters
سال: 1991
ISSN: 0146-9592,1539-4794
DOI: 10.1364/ol.16.001783