title: Long working distance microscope with a low obscuration aspherical Schwarzschild objective.
abstract: For fine stitching of multiwindow wide-spectrum detectors, an aspherical Schwarzschild objective with an effective working distance of 525 mm has been realized for chromatic aberration-free imaging in 400-900 nm wavelength range and with a numerical aperture of 0.13. A theoretical approach for analytical design of an initial configuration has been modeled using an on-axis Taylor series expansion, and the beam obscuration ratio (OR) has been controlled down to 4%. In comparison against the theoretical spherical-based Schwarzschild objective, 77.5% of the OR has been reduced for improved contrast.
authors.forename: Jiubin
authors.initials: J
authors.lastname: Tan
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wang
authors.forename: Weibo
authors.initials: W
authors.lastname: Wang
authors.forename: Jian
authors.initials: J
authors.lastname: Liu
authors.forename: Richard
authors.initials: R
authors.lastname: Leach
authors.forename: Ling
authors.initials: L
authors.lastname: Hao