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Spectra UV-VIS-NIR

Standard Monochromator

Model: HO-SP-M01S   |   HO-SP-M03S
Designed for general spectroscopic application
Designed for Low light spectroscopic application

HOLMARC’s Spectra UV-VIS-INR standard monochromators are designed for general spectroscopic research needs. These monochromators are designed using single 1200 lines / mm holographic precision grating. A microprocessor onboard controls the motor for precision wavelength positioning. The instrument can be operated either from the front panel or through a personal computer which can be interfaced with the device by using RS 232C serial port. The front panel of the device has user friendly keyboards and back lit LCDs. Input and output ports of the monochromator are fitted with precise, micrometer controlled variable slits. Mirrors are kinematically mounted for fine tuning during installation and setup. The software developed for the instrument has facilities for setting up and calibration as well. System accepts input data as wavelength or wave number.

Monochromator consists of diffraction grating, slits and spherical mirrors, all held by precision opto-mechanical mounts. The input light source, which is always application dependent, typically emits a broad spectrum of radiations. Diffraction grating disperses light by diffracting different wavelengths at different angles. The angular position of the grating is adjusted by the use of rotary stage so that light with required wavelength is passed through the exit slit and all other wavelengths are blocked, without changing position of mirrors and slits.

Precision stepper motor controlled rotation stage is used for driving the grating. Very fine resolution for the grating stage is achieved by the micro-stepping feature of the stepper motor control. Wavelength selection is made much easier in automated system compared to manually adjusted versions.



        Optical path configuration :     Czerny-Turner type
        Wavelength Range :     200 - 1600 nm
        Scanning Range :     200 - 1100 nm
        Collimating & Focusing mirror :     50 mm dia, 300 F
        Optical Grating :     1200 l / mm
        Grating Size :     50 x 50 mm
        Absolute Diffraction Efficiency :     45 - 65 %
        Slit Width :     0 ~ 3 mm Continuously Adjustable
        Resolution :     0.1 nm (@ 546 nm, 10 μm slit width)
        Wavelength Accuracy :     ≤ 0.2 nm
        Wavelength Repeatability :     ≤ 0.1 nm
        Stray Light :     ≤ 10-3
        Reciprocal of Linear Dispersion :     2.7 mm
        Half-Width of Spectral line :     ≤ 0.2 nm  @   586 nm
    A fixed diverter mirror assembly for entrance side port
    A exit selection diverter mirror assembly for exit ports
    A micrometer controlled adjustable slit for entrance and exit ports,
    0 to 3mm(10micrometer increment/decrement unit)
        Optical path configuration :     Czerny-Turner type
        Focusing mirror :     80 mm dia, 500 F
        Collimating mirror :     80 mm dia, 500 F
        Clear aperture :     76.92 mm
        Coating :     Broadband Al-Coating
        Folding mirror :     55 x 40 mm
        Grating Size :     50 x 50mm (68 x 68mm Optional)
        Resolution :     0.05 nm  @   435.8 nm   [ 1200 gr/mm grating, 10 μm slits ]
        Accuracy :     +/- 0.2 nm
        Repeatability :     +/- 0.04 nm
        Drive-step size :     0.0025 nm with 1200gr/mm
        Dispersion :     1.7 nm / mm
        Aperture :     f / 6.5
        Interface :     RS232 & USB Standard
        Focal-plane size :     26 mm wide x 14 mm high
    A fixed diverter mirror assembly for entrance side port
    A exit selection diverter mirror assembly for exit ports
    A micrometer controlled adjustable slit for entrance and exit ports,
    0 to 3mm(10micrometer increment/decrement unit)
        Micrometer adjustable slits to precisely control incoming light.
        User specified gratings to meet specific applications
        Stepper motor scanning for precision wavelength positioning
        Internal shutter or filter wheel (Optional)
        Motorized slit (Optional)
        Custom configurations


Fig. Optical Layout of Spectra HO-SP-M01S Monochromator





Available Holographic Grating Options

    1200 l/mm

    1800 l/mm

    2400 l/mm


Monochromators are available in various port configurations.

Single I/P & O/P port, Double I/P & O/P port

Single I/P & Double O/P port, Double I/P & Single O/P port

Other model in standard series monochromator

    Model : HO-SP-M02S    -    400 mm Focal length Monochromator

    Model : HO-SP-M04S    -    600 mm Focal length Monochromator

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