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Category : Spectroscopy, colorimetry, photometry, fluometry > Spectrographs
Holographic imaging spectrograph
The HoloSpec™ ƒ/1.8 holographic imaging spectrograph provide high throughput due to their low aperture ratio. The aperture ratio of ƒ/1.8 provides approximately five– to thirty-eight–times greater collection angle than spectrographs operating at ƒ/4 to ƒ/8.
The HoloSpec ƒ/1.8 spectrograph, equipped with a broad-band grating, is well-suited to visible or fluorescence spectroscopy, or to Raman applications involving filtering of Rayleigh scatter outside the spectrograph.
The HoloSpec holographic imaging spectrograph is based on KOSI's award-winning axial transmissive spectrograph configuration. This configuration is based on holographic optical elements (HOEs) that are the result of a decade of development of HOEs for high-performance military applications.
In the axial transmissive spectrograph, the volume-phase holographic (VPH™) transmission grating replaces the Czerny-Turner spectrograph's surface-relief reflection grating as the dispersive element, and axially symmetric, multi-element lenses replace the off-axis, typically toroidal mirrors as the collimating and focusing elements. The VPH grating, recorded in dichromated gelatin, achieves high diffraction efficiency (typically 80% for unpolarized light) and high spatial frequency, while allowing a 90° fold angle, coupled with short-focal-length lenses. This results in a compact spectrograph with linear dispersion similar to that typically achieved with 1/4- to 1/2-meter Czerny-Turner spectrographs. The imaging design allows for multichannel or line imaging applications with no modification to the basic spectrograph.
Article from Kaiser Optical Systems, Inc.
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