Title:
METHOD FOR COUPLING NARROW-BAND INTERFERENCE FILTERS TO TWO-MIRROR AND CATADIOPTRIC TELESCOPES
Document Type and Number:
WIPO Patent Application WO2000055668
Kind Code:
B1
Abstract:
A monochromator in which the separation of the mirrors of a two-mirror telescope (50) is altered to produce a virtual object (57, 58) for a converging lens (Lf), termed a "forcing lens", the forcing lens being so located between the virtual object and a narrow-band interference filter (70) (typically containing a Fabry-Perot etalon) that the convergent beam of light from the telescope passes through the interference filter at a high focal ratio, relative to the telescope's conventional focal ratio, before it traverses the forcing lens, which forms the optical system's only real image (57f, 58f), at a different, and much lower, focal ratio. Image contrast, relative to the contrast at the telescope's conventional focus, is notably enhanced. By means of a graduated series of entrance pupils, a step-wise-zoom, constant-contrast monochromator may be constructed. Formulas are provided for parfocalizing a series of forcing lenses, thereby allowing real-image height to be adjusted.
Inventors:
OLSHAUSEN MICHAEL (US)
Application Number:
PCT/US2000/002538
Publication Date:
December 28, 2000
Filing Date:
March 08, 2000
Export Citation:
Assignee:
OLSHAUSEN MICHAEL (US)
International Classes:
G01J3/26; G02B5/28; G02B17/08; (IPC1-7): G02B17/08; G02B23/00
Download PDF:
Previous Patent: A CHROMATICALLY UNCOMPENSATED OPTICAL SYSTEM FOR COMPOSING COLOUR IMAGES
Next Patent: AN OPTICAL SIGHTING DEVICE
Next Patent: AN OPTICAL SIGHTING DEVICE