Model 275D Double Monochromator0 pages

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mcPHEHSIIll

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Model 275D

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Additive or Subtractive Mode

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Double Monochromator

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GENERAL DESCRIPTION

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The Model 275D is a dedicated double grating

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monochromator providing additive or subtractive

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dispersion. The 275D's compact housing contains

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the scanning mechanism and mechanical linkage

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of one sine drive to two gratings. Wavelength con-

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trol is via a single motor and scan drive. The step-

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per drive (refer to Model 789A-3) is interfaced for

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operation via PC.

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Double monochromators are used for a variety of

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applications that require extremely low levels of

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scattered or stray light. The most popular appli-

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cations include:

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• Additive Double Spectrometer - higher resolu-

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tion with low stray light

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Source / Detector Standardization

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• Subtractive Double Spectrometer - bunched

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spectral energy with low stray light

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Raman Spectroscopy

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Photoluminescence

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OPTICAL SYSTEM

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Model 275D's focal length is 0.2 meters and it can

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be configured for additive or subtractive dispersion.

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The optically and mechanically coupled modified

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Seya-Namioka systems are equipped with aber-

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ration corrected concave holographic gratings.

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Spectrally agile, the model 275D features all first

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surface optics for the best UV-Vis-NIR response.

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275D PERFORMANCE

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The Model 275D is reliably pretested with second-

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ary monochromators and selected filters. It is a use-

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ful building block in customized test systems.

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Model 275 DA, Additive Mode Double Spectrometer

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à ■

i

V Y,

Ir-

0.2

nm —

1

'■

W /

-va

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Model 275DA, Repeatability Scans at Hg 253.6 nm

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SPECIFICATIONS

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Specifications are for subtractive mode and assume use

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of a 1200 g/mm where applicable. Other gratings are avail-

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able (e.g. 300, 600, and 2400 g/mm) for range or perfor-

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mance alteration.

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(2X) 200 mm

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f/4.2

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185 - 1000 nm

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Focal Length

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Aperture Ratio

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Wavelength Range

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Dispersion*

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Resolution*

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Accuracy

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Repeatability

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4 nm/mm

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0.15-nm

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±0.06 nm Vis (measured)

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±0.5 nm UV-Vis-IR

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± 0.05 nm UV-Vis-IR (measured)

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* Divide by 2 for Additive mode specification

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Stray Light (measured) < 6.4 x 104(UV NPL procedure)

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<5.0 x 10"4 ^UV-Vis NPL procedure

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<1.3 x 160" , 10 nm from 632.8 nm

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(100 urn slits)

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7A Stuart Road » Chelmsford, MA 01824 USA «Tel. 978-256-4512, 1-800-255-1055 (US) » Fax: 978-250-8625 » Email: MCP@mcphersoninc.com

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