Abstract:
An imaging assembly for a spectrometer includes a substrate with first and second modules thereon containing respective arrays of detector elements positioned so the arrays are elongated along a first axis with a gap therebetween. A third module including a third array of detector elements is also thereon, spaced from the first axis, at least as long as the gap, and smaller than the elongation of either of the first or second arrays. Further thereon are first and second slits elongated along a second axis spaced from and generally parallel to the first axis, each being at least as long as the respective arrays. A third slit at least as long as the gap is also therein, spaced from the first axis, second axis, and third array such that the gap, third slit, and third array are generally along a third axis generally perpendicular to the first and second axis.
Abstract:
Various embodiments provide a Cassegrain-like telescope. The Cassegrain-like telescope includes a primary mirror; a secondary mirror spaced apart from the primary mirror, the primary mirror and the second mirror configured to form a focal surface; and an optical aberrations corrector having a plurality of lenses, the optical aberrations corrector being disposed between the secondary mirror and the focal surface, the optical aberration corrector being configured to correct optical aberrations of the primary mirror and the secondary mirror. A material of the plurality of lenses is selected to transmit radiation in a wavelength range between approximately 0.4 μm and approximately 12 μm, and is selected to have variations in refractive index below about 0.05 so as to reduce chromatic aberration to a level such that an average root mean square of wave front error (RMS WFE) is less than approximately 0.08.
Abstract:
A spectrometer comprises a detector array and a prism. The prism comprises a first prism element comprising a substantially crystalline crown material, and a second prism element contacting the first prism element, the second prism element comprising a substantially crystalline flint material. The spectrometer further includes optics configured to direct light at least twice through the prism. The prism is configured to disperse light received from the optics at an incident angle therethrough into constituent spectra in visible and infrared wavelength bands that are dispersed from the prism at angles offset from the incident angle. The constituent spectra are directed onto the detector array with approximately equal dispersion across the visible and infrared wavelength bands. Among other things, desirable material selections for the first and second prism elements are also disclosed.
Abstract:
A spectrometer comprises a detector array and a prism. The prism comprises a first prism element comprising a substantially crystalline crown material, and a second prism element contacting the first prism element, the second prism element comprising a substantially crystalline flint material. The spectrometer further includes optics configured to direct light at least twice through the prism. The prism is configured to disperse light received from the optics at an incident angle therethrough into constituent spectra in visible and infrared wavelength bands that are dispersed from the prism at angles offset from the incident angle. The constituent spectra are directed onto the detector array with approximately equal dispersion across the visible and infrared wavelength bands. Among other things, desirable material selections for the first and second prism elements are also disclosed.
Abstract:
A coude gimbal structure includes a two-axis gimbal system having an outer gimbal pivotable about a first rotational axis, and an inner gimbal supported on the outer gimbal and pivotable about a second rotational axis which intersects the first rotational axis at an intersection point. A folded afocal three-mirror anastigmat has a positive-optical-power primary mirror, a negative-optical-power secondary mirror, and a positive-optical-power tertiary mirror, and a first flat fold mirror, and a second flat fold mirror. A beam path incident upon the primary mirror is reflected from the primary mirror to the secondary mirror. The tertiary mirror lies on the second rotational axis, the first flat fold mirror redirects the beam path reflected from the secondary mirror to the tertiary mirror, and the second flat fold mirror lies at the intersection point and redirects the beam path reflected from the tertiary mirror along the first rotational axis.