Cornerstone 260 1/4 m Monochromators - Newport Cornerstone 260... ...

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  • Cornerstone 260 1/4 m Monochromators

    The Cornerstone 260 Monochromator is available in a number of differentconfigurations. The model shown here uses micrometer adjustable slits at theinput and output port, providing flexibility and high throughput.

    Models available for UV to NIR applications

    Motorized wavelength and grating selection

    Choice of micrometer adjustable slits, motorized slits orfixed slits

    Single or dual output port instruments available

    Interfaces USB, RS232, GPIB or optional hand controller

    Includes utility software at no extra cost

    The Oriel Cornerstone 260 is a high performance, economical anduser-friendly monochromator an ideal instrument for research andOEM applications. Oriel has made it easy to choose the rightmonochromator based on the application, with pre-configuredmodels to fit most needs. Selecting a Cornerstone 260 model isbased upon:

    Wavelength range of interest

    Input and output slit type

    Single or dual output port

    Desired computer interface

    W H A T ' S I N C L U D E D

    Each Cornerstone 260 monochromator includes:

    Preselected diffraction gratings, installed and aligned

    Electronic shutter at input port

    A choice of single or dual output ports

    A choice of micrometer adjustable slits, motorized or fixed slit holdersat the input port and output port(s)

    A choice of electronics interface for GPIB/RS232 or USBcommunication

    A hose barb to purge the instrument compartment for measurementsbelow 180 nm (actual capability is grating configuration dependent)

    LabVIEW based utility software

    Application Programming Interface (API) for LabVIEW withexamples

    MonoTerm low-level command software

    Certificate of Calibration

    Monochromator Power Supply

    Line cords (U.S. and Europe)

    Users manual

    For monochromators featuring fixed slit holders, a variety of fixed slitsizes are available. The input and output slits should be the samesize (ordered separately).

  • O P T I C A L D E S I G N

    The optical design of the Cornerstone 260 is based upon anasymmetrical in-plane version of a Czerny-Turnermonochromator. The optical configuration is designed toensure high resolution and maximum throughput. This F/3.9monochromator is optimized to provide excellent stray lightrejection while minimizing aberrations. A high precisionmotor is used to select the desired wavelength and switchbetween diffraction gratings quickly, without sacrificingperformance.

    ENTRANCE

    LATERALEXIT

    AXIALEXIT

    OPTIONALOUTPUTMIRROR

    Optical configuration of the Cornerstone 260 Monochromator. The instrument may be configured witheither two or three diffraction gratings.

    S T R A Y L I G H T R E J E C T I O N

    Stray light may have a variety of origins. Its presence may becaused by a wide variety of design and manufacturingfactors. The level of stray light due to the dispersed radiationinside the monochromator is affected by the design of theinstrument, its baffles and interior finish. The Cornerstone260 incorporates a sophisticated design, proven materials,and a quality manufacturing system to ensure high stray lightrejection.

    The amount of stray light measured on top of true signal willdepend on many experimental factors as well as theperformance of the instrument. When comparing stray lightspecifications, it is important to compare values that weremeasured under identical circumstances. The spectraldistribution of the source and the response of the detectionsystem are often the dominant factors when determining astray light value.

    G R A T I N G SThe choice of gratings for any spectroscopic systemdepends on the application and must be made as one stepin an iterative process of system design. The radiationsource, radiation detector, polarization of radiation, spectralrange of interest and desired resolution all play a role ingrating selection. Two or three gratings are installed into theCornerstone 260 monochromator. In general, the grating withthe highest efficiency is chosen at a particular wavelength.The optional Oriel TracQ Basic Data Acquisition andRadiometery Software allows users to set up a specificgrating switchover wavelength, so the most appropriategrating will automatically be chosen while performing a scanover a range of wavelengths.

    Configuration Grating 1 Line Density Grating 2 Line Density Grating 3 Line Density Primary Wavelength RangeHigh Resolution 1200 lines/mm 1200 lines/mm 1200 lines/mm 200 to 1350 nm

    High Resolution Extended Range 1200 lines/mm 1200 lines/mm 600 lines/mm 300 to 1800 nm

    UV-VIS 600 lines/mm 600 lines/mm n/a 200 to 1300 nm

    Extended Range 600 lines/mm 600 lines/mm n/a 250 to 2400 nm

    Near Infrared 600 lines/mm 300 lines/mm n/a 550 to 2500 nm

    CORNERSTONE 260 1 / 4 M M O N O C H R O M A T O R

    The Cornerstone 260 monochromators feature diffractiongratings produced by Richardson Gratings. Both OrielInstruments and Richardson Gratings are part of the Newportfamily of brands, and have a long history of working togetherto design monochromators that are appropriate for a widevariety of applications.

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    Grating Efficiency CurvesCornerstone 260 Monochromator High Resolution Configuration

    Effic

    ienc

    y (%

    )

    Wavelength (nm)

    200 400 600 1000800 1200 1400

    The efficiency curve above is relative (not absolute) and was measured using an in-plane near Littrow configuration. Please use the curves as a guide and not as absolute data. Grating diffraction is dependent on the polarization of the radiation incident on the grating.

    Grating 1 Grating 2 Grating 3

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    Grating Efficiency CurvesCornerstone 260 Monochromator UV-VIS Configuration

    Effic

    ienc

    y (%

    )

    Wavelength (nm)

    200 400 600 1000800 1200 1400

    The efficiency curve above is relative (not absolute) and was measured using an in-plane near Littrow configuration. Please use the curves as a guide and not as absolute data. Grating diffraction is dependent on the polarization of the radiation incident on the grating.

    Grating 1 Grating 2

    S L I T S

    To operate any monochromator, slits are required at the inputand output port. These need to be the same width andheight at all ports. The slits offered with the Cornerstone 260all have 1.5-inch male flanges, allowing them to be easilyconnected to the wide variety of Oriel accessories andinstruments.

    The resolution of the monochromator is related to the gratingdispersion a function of the grating design and the slitwidth. Resolution at the blaze wavelength of the grating iscalculated to be the reciprocal dispersion multiplied by theslit width.

    Available configurations:

    Fixed slit holders (fixed slits sold separately)

    Micrometer adjustable slits

    Motorized slits with dual output port instruments

    The fixed slits slide into the holders at the input and outputport. The width and height cannot be adjusted, but may beindividually replaced with other slit sizes. Fixed slits are a lowcost alternative with excellent repeatability. They are a goodchoice when only a few slit sizes are required. They are soldseparately to allow customized choices based on the needsof the application. When ordering, be sure to purchase fixedslits of the same model for the input port and output port(s).Order two fixed slits for single output models, and three fixedslits for the dual output port monochromators.

    Fixed Slit Model Width Height77222 10 mm 2 mm

    77220 25 mm 3 mm

    77219 50 mm 6 mm

    77218 120 mm 18 mm*

    77217 280 mm 18 mm*

    77216 600 mm 18 mm*

    77215 760 mm 18 mm*

    77214 1.24 mm 18 mm*

    77213 1.56 mm 18 mm*

    77212 3.16 mm 18 mm*

    77211 6.32 mm 18 mm*

    *Actual slit height is 18 mm, usable height is 12 mm.

    Fixed slit holder without the slit installed. Fixed slit holder with a slit installed (slits ordered separately).

    CORNERSTONE 260 1 / 4 M M O N O C H R O M A T O R

    Effic

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    Wavelength (nm)

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    Grating Efficiency CurvesCornerstone 260 Monochromator Extended Range Configuration

    200 400 600 1000800 1200 1400 1600 1800 2000 2200 2400

    The efficiency curve above is relative (not absolute) and was measured using an in-plane near Littrow configuration. Please use the curves as a guide and not as absolute data. Grating diffraction is dependent on the polarization of the radiation incident on the grating.

    Grating 1 Grating 2

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    Grating Efficiency CurvesCornerstone 260 Monochromator High Resolution Extended Range Configuration

    Effic

    ienc

    y (%

    )Wavelength (nm)

    The efficiency curve above is relative (not absolute) and was measured using an in-plane near Littrow configuration. Please use the curves as a guide and not as absolute data. Grating diffraction is dependent on the polarization of the radiation incident on the grating.

    300 600 900 1200 1500 1800

    Grating 1 Grating 2 Grating 3

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    Effic

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    Wavelength (nm)

    Grating Efficiency CurvesCornerstone 260 Monochromator VIS-NIR Configuration

    400 600 800 12001000 1400 1600 1800 2000 2200 2400 26

    The efficiency curve above is relative (not absolute) and was measured using an in-plane near Littrow configuration. Please use the curves as a guide and not as absolute data. Grating diffraction is dependent on the polarization of the