MS127i™ 1/8 m Imaging Spectrograph

Resolves multiple spectral tracks with excellent spatial separation
Built-in shutter for zero referencing and for multi-track applications
Low stray light, minimal rediffracted light
Easily changeable gratings for true versatility

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Overview
Specifications
Ordering
Drawings
Literature & Downloads

The MS127i™ is a versatile, efficient, single grating, imaging spectrograph at an affordable price. For spectroscopy applications not covering a broad spectral range, and not requiring the resolution and imaging performance of our high end MS260i^TM and MS257^TM ¼ m instruments, the MS127i^TM is the right choice. For a specification comparison of all our spectrographs, refer to Table 1.

Table 1 Oriel Spectrographs

Spectrograph	Imaging	Automated	Spectral Resolution (nm)*	No. of Gratings Supported	Built-in Shutter	Max No. of Fiber Tracks	Dual Output Ports	RS-232	IEEE-488 (GPIB)
Spectrograph	Imaging	Automated	Spectral Resolution (nm)*	No. of Gratings Supported	Built-in Shutter	Max No. of Fiber Tracks	Dual Output Ports	RS-232	IEEE-488 (GPIB)
Imaging Spectrograph, 1/8 m, Single Grating, Oriel MS127i	X		0.22 nm	1	X	5
MS260i 1/4 m Spectrograph,GPIB, 1 Output Port, Grating & Slit Ordered Separately	X	X		3	X	9		Standard	Standard
MS260i 1/4m Spectrograph,GPIB, 2 Output Ports, Grating & Slit Ordered Separately	X	X		3	X	9	X	Standard	Standard
MS257^TM 1/4 m Monochromator, RS-232		X	0.15	4	X	1	X	Standard	Optional
MS257^TM 1/4 m Imaging Spectrograph RS-232	X	X	0.15	4	X	9		Standard	Optional
MS125 Spectrograph, 1/8 m, Grating and Slit Ordered Separately			0.22 nm	1		1

Optical Configuration

The MS127i has been designed for ultra low stray light and no re-diffracted light. It utilizes a Czerny-Turner optical layout with one significant modification - the addition of an astigmatism correcting mirror after the collimating mirror (see Fig. 1). This patented system allows high spectral and spatial resolution at a low F/#, F/3.8.

Fig. 1 Optical configuration of MS127i 1/4 m Spectrograph

Wavelength Drive

Wavelength setting is manual on the MS127i™. The instrument is calibrated for the central wavelength of the image field when using a 1200 l/mm grating. If you are working with a 2400, 600, 400, etc. l/mm grating, multiply the wavelength setting by the “wavelength scale conversion factor” listed in Table 2. Although the simple drive mechanism does not allow very accurate wavelength settings, it is highly reproducible and will allow you to switch between pre-determined wavelength positions with confidence.

Multi-track Spectroscopy with MS127i Spectrograph

Full correction for astigmatism in spectral instruments requires sophisticated toroidal mirrors (as in our MS257 1/4 m spectrograph); they allow vertical resolution of many tracks simultaneously. But, for many applications there is a need for only 2 to 3 tracks, as in double beam work. We designed the MS127i to correct astigmatism economically. You can reliably separate multiple tracks for Multi-track Spectroscopy with a CCD that has the ability to record individual tracks, such as our InstaSpec™ CCDs. Thus, MS127i makes the acquisition of double beam spectra of pulsed or continuous sources possible on a limited budget.

Built-in Shutter

A normally closed shutter located behind the input slit effectively blocks light from entering MS127i. The shutter circuitry is housed inside MS127i; shutter power is from a simple 5 V supply, provided. Minimum opening time is 0.2 s. This shutter will operate at rates to 0.5 Hz.

Interchangeable Gratings

We offer a large selection of interchangeable gratings for the MS127i™. Choose the one that covers the spectral range of interest. The gratings are supported on a precision holder, which clips into the grating mount. They can be easily interchanged without the need to realign the instrument. Table 2 lists the specifications for each model.

Table 2 Gratings for MS127i™ 1/8 m Spectrograph

Model	Line Density (I/mm)	Blaze Wavelength	Grating Type	Wavelength Scale Conversion Factor	Multichannel Array Bandpass (nm)*	Spectral Resolution (nm)**	Peak Efficiency (%)	Primary Wavelength Region*** (nm)	Instrument's Upper Mechanical Wavelength Limit (for specified grating)
77483	3600	405	Holographic	0.33	46	0.06 nm	60	180 - 395	395
77484	2400	250	Holographic	0.5	84	0.11 nm	65	180 - 600	600
77485	2400	400	Holographic	0.5	81	0.11 nm	65	230 - 600	600
77486	1800	500	Holographic	0.67	107	0.14 nm	80	300 - 805	805
77487	1200	250	Holographic	1	165	0.22 nm	80	180 - 650	1200
77488	1200	350	Ruled	1	165	0.22 nm	80	200 - 1200	1200
77489	1200	750	Ruled	1	163	0.22 nm	80	450 - 1200	1200
77491	600	400	Ruled	2	330	0.43 nm	85	250 - 1300	2400
77492	600	750	Ruled	2	2400	0.43 nm	75	450 - 2400	2400
77473	600	1250	Ruled	2	328	0.43 nm	85	750 - 2400	2400
77474	600	1600	Ruled	2	320	0.43 nm	90	900 - 2400	2400
77493	400	350	Ruled	3	493	0.65 nm	65	200 - 800	3600
77494	400	500	Ruled	3	495	0.65 nm	80	300 - 1200	3600
77477	400	1600	Ruled	3	498	0.65 nm	85	900 - 2900	3600
77495	300	300	Ruled	4	655	0.86 nm	75	200 - 750	4800
77478	300	1000	Ruled	4	655	0.86 nm	85	575 - 2500	4800
77479	246.16	226	Ruled	4.8	795	1.02 nm	60	190 - 450	5760

Input Slits

MS127i comes with an input slit holder. We provide fixed slits in widths from 10 to 200 µm.

Mounting

MS127i has 1/4-20 tapped holes for rod mounting, or you can simply sit it on a flat surface. It is heavy enough to support a detector, without being hard mounted to a baseplate.

Specifications

Input Focal Length	127 mm
Exit Focal Length	138.5 mm
F/#	F/3.7
Usable Wavelength Range	180 nm to 25 µm with interchangeable gratings
Horizontal Magnification (Spectral Direction)	1.1
Vertical Magnification (Spatial direction)	1.1
Resolution	0.22 nm*
Maximum Blur Size in Vertical Direction	0.7 nm
Wavelength Accuracy	1 nm**
Wavelength Scale Reproducibility	0.1 nm***
Weight	8 lbs (3.6 kg)

*With 1200 l/mm grating, 10 µm x 2 mm slit and 14 x 200 µm size pixels (2048 element array).
**Accuracy of wavelength scale, does not include the tolerance of the detector mounting.
***Reproducibility of wavelength calibration of the whole system, the spectrograph plus the detector, related to repetitive settings of the 1200 l/mm grating to the same position.

Model	Description	avail raw	Availability	price raw	Price	Qty. MULTI ADD
77221	Fixed Slit, 50 µm Width, 3 mm Height	0	In Stock	294	$294.00	ADD
77477	MS127i Ruled Grating, 400 lines/mm, 1600nm Blaze, 900-2900nm Primary	0	In Stock	672	$672.00	ADD
77479	MS127i Ruled Grating, 246.16 lines/mm, 226nm Blaze, 190-450nm Primary	5	5 Weeks	672	$672.00	ADD
77484	MS127i Holographic Grating, 2400 lines/mm, 250nm Blaze, 180-395nm Primary	5	5 Weeks	788	$788.00	ADD
77492	MS127i Ruled Grating, 600 lines/mm, 750nm Blaze, 450-2400nm Primary	5	5 Weeks	672	$672.00	ADD
77494	MS127i Ruled Grating, 400 lines/mm, 500nm Blaze, 300-1200nm Primary	99	Call	672	$672.00	ADD
77730	Fixed Slit, 200 µm Width, 3 mm Height	0	In Stock	163	$163.00	ADD
77222	Fixed Slit, 10 µm Width, 2 mm Height	4	4 Weeks	392	$392.00	ADD
77473	MS127i Ruled Grating, 600 lines/mm, 1250nm Blaze, 750-2400nm Primary	5	5 Weeks	672	$672.00	ADD
77485	MS127i Holographic Grating, 2400 lines/mm, 400nm Blaze, 180-600nm Primary	6	6 Weeks	788	$788.00	ADD
77483	MS127i Holographic Grating, 3600 lines/mm, 405nm Blaze, 180-395nm Primary	5	5 Weeks	788	$788.00	ADD
77491	MS127i Ruled Grating, 600 lines/mm, 400nm Blaze, 250-1300nm Primary	6	6 Weeks	672	$672.00	ADD
77493	MS127i Ruled Grating, 400 lines/mm, 350nm Blaze, 200-900nm Primary	5	5 Weeks	672	$672.00	ADD
77486	MS127i Holographic Grating, 1800 lines/mm, 500nm Blaze, 230-600nm Primary	5	5 Weeks	788	$788.00	ADD
77488	MS127i Ruled Grating, 1200 lines/mm, 350nm Blaze, 200-1200nm Primary	99	Call	672	$672.00	ADD
77728	Fixed Slit, 100 µm Width, 3 mm Height	0	In Stock	163	$163.00	ADD
77218	Fixed Slit, 120 µm Width, 18 mm Height	0	In Stock	163	$163.00	ADD
77474	MS127i Ruled Grating, 600 lines/mm, 1600nm Blaze, 900-2400nm Primary	5	5 Weeks	672	$672.00	ADD
77219	Fixed Slit, 50 µm Width, 6 mm Height	0	In Stock	294	$294.00	ADD
77220	Fixed Slit, 25 µm Width, 3 mm Height	0	In Stock	392	$392.00	ADD
77478	MS127i Ruled Grating, 300 lines/mm, 1000nm Blaze, 575-2500nm Primary	5	5 Weeks	672	$672.00	ADD
77495	MS127i Ruled Grating, 300 lines/mm, 300nm Blaze, 190-450nm Primary	99	Call	672	$672.00	ADD
77489	MS127i Ruled Grating, 1200 lines/mm, 750nm Blaze, 450-1200nm Primary	6	6 Weeks	672	$672.00	ADD
77480	Imaging Spectrograph, 1/8 m, Single Grating, Oriel MS127i	6	6 Weeks	3016	$3,016.00	ADD
77487	MS127i Holographic Grating, 1200 lines/mm, 250nm Blaze, 180-650nm Primary	5	5 Weeks	798	$798.00	ADD