本階梯光柵光譜儀是為衍射極限而專門設計的!

全光譜覆蓋無縫可調150nm范圍內單程模式分辨率~2pm，

本光譜儀采用兩個光柵， 二個1.5米F. L.拋物面反射器和一個校正器透鏡，產生交叉分散分級光柵圖（echellegram），

記錄器為3K X3K冷卻CCD照相機（12U像素），分散1 pm/pixel。

使用3段圖像切片機把細而長的分級光柵圖投射為方形CCD格式，以波長覆蓋和分辨率。

This is an Echelle Spectrometer designed for diffraction limit operation, that provides a full spectrum coverage without gaps over a tunable 150nm range at a resolution of ~2pm in single pass mode. The spectrometer uses two gratings, two 1.5m f.l. parabolic reflectors and a corrector lens to produce a cross-dispersed echellegram that is recorded on a 3k x 3k cooled CCD camera with 12u pixels, at a dispersion of 1 pm/pixel. The long, thin echellegram is fit to the square CCD format using a 3 section image slicer, to maximize wavelength coverage and resolution.

Input optics include a micrometer adjustable rectangular input slit and a computer controlled source selector that can switch between four available input ports, useful in calibration.
Operational specifications are (for 31.5 l/mm 150x50 mm echelle, single pass)
* Dispersion: 1pm/pixel; (diffraction limit = 1pm)
* Wavelength coverage: 150nm band, position continuously selectable.
No gap coverage up to 800nm. Camera coverage 300nm-900nm.
* Aperture f/25.
* Input slit: rectangular, continuously adjustable 0-500um.
* Source selector to switch between four inputs.
* Calibration facilities for wavelength and intensity.
* Software to transfer raw images to permanent storage at the maximum possible rate, to transform and store as spectra corrected for wavelength & intensity.

Please note that for full frame digitization at 12 bits the transfer rate is 10seconds per frame. Smaller frame sections can be transferred at correspondingly faster rates.