Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1534561 | Optics Communications | 2014 | 8 Pages |
Abstract
Some ideas that were developed by Wynne to improve the performance of the Offner unit magnification imaging system are used to design Offner imaging spectrometers to which a concentric meniscus lens has been added. The new degrees of freedom associated to the meniscus lens allow removing image aberrations far from the paraxial region in a wide annular area or even more, in two concentric annular areas. This provides a great flexibility of design as it is shown below in four examples. In these examples, the slit length, the f-number or the spectral resolution has been optimized while retaining almost diffraction-limited spot size, with rather separate slit and image, and getting quite compact designs in comparison to the original Offner system. In particular, the most compact system (~50Ã40Ã30mm3) has an f-number of 1.86, a slit length of 9.6Â mm and covers a spectral range from 400 to 1000Â nm, being diffraction-limited for wavelengths longer than 450Â nm.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Xesús Prieto-Blanco, Raúl de la Fuente,