title: Cross-axis cascading of spectral dispersion.
abstract: We demonstrate a method of cascading multiple diffractive elements for improving the purity of spectral dispersion. The cross-axis cascade was implemented in a two-stage grating spectrograph, resulting in a hundredfold reduction of stray light and a high dynamic range up to -75 dB. The technique can be used for parallel spectral measurements and processing.
authors.affiliation: Harvard Medical School and Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA 02114, USA.
authors.forename: Giuliano
authors.initials: G
authors.lastname: Scarcelli
authors.forename: Pilhan
authors.initials: P
authors.lastname: Kim
authors.forename: Seok Hyun
authors.initials: SH
authors.lastname: Yun
mesh_terms: D000465:Algorithms; D004867:Equipment Design; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted; D007834:Lasers; D008027:Light; D055095:Optics and Photonics; D012031:Refractometry / Q000379:methods; D012984:Software; D013053:Spectrophotometry / Q000379:methods*