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Laser Raman Spectrometer

Model : HRRS 216R2

Holmarc’s new series of updated cooled CCD spectrometers are configured for Raman spectroscopy applications, which can perform quick identification of a variety of liquid, solid or powder samples.

It has been developed to meet the needs of Material Science, Manufacturing and Biochemistry, offering high quality optical system which can be fully customized for using with fiber-optic probes. It can be used with optional microscope as well with spatial resolution down to 20 μm. Spectra software simplifies data collection and analysis. Software facilitates library searching and sample database creation.

This spectrometer is designed for recording Raman emissions from solids as well as liquids when a laser beam is passed trough the sample. The apparatus suits Chemistry as well as Physics labs for characterizing materials by recording Raman emissions. The set up consists of 200mW DPSS 532nm laser with variable power controlling option, collection optics, sample mount, monochromator and cooled CCD camera.

The measurements are undertaken by selective scanning method providing full spectral collection of Raman data at high spectral resolution. Spectrometer records the intensity of each interested wavelength range using cooled CCD camera. The readings are plotted on a graph. Spectrometer used in the system is having high resolution and low stray light. Electronics hardware is made integrated with spectrometer, detector and laser source, so that fully automatic operation is possible from interfaced computer.

        Spectrometer D / f :     1 / 6
        Grating :     1200  l / mm
        Entrance slit :     0 - 2 mm adjustable
        Wavelength Range :     320 - 1050nm (Spectrometer)
        Raman Spectrum :     200 - 4000 cm-1
        Laser Source :     DPSS 532nm low noise laser, 785nm laser (optional)
        Output Power :     > 200mW variable power
        Wavelength Accuracy :     ± 0.1 cm
        Wavelength Repeatability :     ≤ 0.5cm
        Resolution :     ≤ 2cm-1 at 532 nm
        Rayleigh Filter :     17 nm bandwidth Notch filter
        CCD detector :     High sensitive CCD detector 3648 element, hermetically sealed vacuum cooled down to -30°C
        Signal to noise ratio :     500 : 1
        A / D Resolution :     12 / 16 Bit
        Exposure Time :     0.1 - 6500 ms
        Optics :     Protective aluminium coated mirrors and aspherized achromatic lenses optimized for VIS-NIR range.
        Objective lens :     Aspherized achromatic 0.45 N.A objective lens with 10mm W.D
        Sample holder :     Accommodate standard 10mm cuvette, custom sample holders
        Sample positioning :     XYZ micrometer with step resolution of 10 micron
    Configurable Wavelengths
        Computer-controlled, user-friendly interface
        Can save your samples and search for matches
        DPSS 532nm laser source
        Both solid and liquid samples can be analyzed
        -30 Degree Cooled CCD Sensor for low light measurements


HOLMARC Spectra RA software features all the functions required for Raman spectra acquisition and analysis. Data processing include data smoothening (Savitsky-Golay, Moving average), difference, normalization, base line correction, peak detection etc. Spectral comparison from the data base implemented in the software provides automatic detection of samples. Data can be exported in spread sheet format compatible with Microsoft Excel.

Irradiation Chamber

Sample irradiation chamber consists of laser, sample holder, mirrors, lenses and other optics, all appropriately mounted on kinematic mounts and translation stages. Laser beam is directed in to the sample using plane mirrors and scattered light from the sample is collected using concave mirrors and condenser lenses. Polarizer and half wave plates are also used on the optical path for polarization and depolarization studies.


Input and output ports of the spectrometer are fitted with precise, micrometer controlled variable slits. The grating is fixed on rotation stage driven by stepper motor. Mirrors in the spectrometer are kinematically mounted for fine tuning during installation and setup. Notch filter for rejection of laser wavelength is used at the output port for protection of PMT.

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