The 8030-DC is a dual channel spectrograph with 62 mm focal length. Its compact size is made possible through the use of a single master concave holographic grating for both channels. The input ports of both channels have SMA connectors for mating with 100µm single core fibers. The f/2 aperture of the 8030-DC matches with fibers that have a numerical aperture (NA) of 0.22.

 Three versions are available: a UV model with 190 nm-350 nm spectral range, a VIS model with 390 nm-800 nm spectral range, and a near-IR model with 600 nm-1100 nm spectral range.

The output spectra of the two channels are side by side so that they share a single 1/2" linear array detector. One side of the linear array detector is used for the first channel output and the other side is for the second channel output. Sciencetech provides two photo-diode linear array detector choices as optional accessories. Both are 256 pixels (128 pixels per channel) but one has a taller 2.5mm pixels for added sensitivity. The other standard detector has 0.5mm tall pixels. The body of the 8030-DC is made from electroless nickel plated aluminum. The outside dimensions are 42 mm in diameter by 70 mm in length and weighs only 5 ounces. The 8030-DC's optical system is pre-aligned for ease of integration in to OEM products.

 Holographic Grating

The Sciencetech 8030-DC spectrograph uses master holographic concave gratings rather than replica gratings. Master concave gratings, or first-generation gratings, have at least one order of magnitude improvement in stray light over replica gratings due to its superb groove reproducibility. Replica concave gratings are in fact third-generation gratings as an intermediate convex grating is required for transferring the groove pattern to it. The stray light improvement of master gratings is especially apparent towards the edge of the grating that affects off-axis rays. Due to the physical process of replicating gratings, the grooves at the outer edge of replica gratings are more likely to be distorted than at the center and stray light and scattering are more pronounced for the off-axis rays.

Output Spectra and Linear Array Detector The 8030-DC grating images both channels onto a 12.6 mm long flat field (or 6.3 mm per channel). Please note the side by side channel layout in the focal plane, and that the dispersion is reversed between the channels. As a result the red ends of the two spectra fall at opposite ends of the detector and the blue ends meet at the center. Processing of the pixel data needs to consider this reversal.