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Spectrometer Goniometer

Advanced Researcher Version

Model: HO-SP-RE-03DM
0.0001 Degree Positioning Resolution
Numerous supporting accessories

For precise determination of angular position, particularly for the optical spectra applications, Holmarc has introduced a new high precision 0.0001 degree resolution spectrometer goniometer. It features low dark current linear Si-Photodiode detection unit for low light measurements. This allows users to work with the spectrometer goniometer in the wavelength range of 320-1100 nm (UV-VIS-NIR). This instrument is suitable for custom experiments and inspection of various optical components with precision. Open and flexible design facilitates quick modification of the instrument for custom applications.

This instrument can as well be used as a spectroscope for the observation and measurement of emission and absorption spectra. Other applications include measurement and determination of optical angles of prisms, thin film characterization through the measurement of reflection and transmission, Brewster's angle spectroscopy etc. When used with a prism, it helps to observe visible light dispersed by wavelength. When used with a diffraction grating and a gas discharge tube, we can observe the emission spectrum of various gases. The wavelengths of each electron transition in the spectrum can be calculated according to the angle of deflection of the light reflected by the grating.

        Telescope & Collimator Tube :     200 mm Focal length
        Aperture :     30 mm
        Detector Unit :     Linear Si Photodiode
        Software :     Spectra RE scanning Soft. Version 1.020
        Rotation :     360 Degree Continuously Rotatable Telescope and Sample
        Design :     Precision Worm gear with double bearing
        Resolution :     0.0001 Degree for Telescope, 0.005 Degree for Sample Plate
        Marking :     Graduated rotary scale for visual reference
        Construction :     Aluminium
        Finish :     Black anodized
        Removable collimator and telescope tubes
        Custom Accessories
        Horizontal and vertical adjustments for collimator & telescope
        Precision slit 0 - 3mm adjustable with 10 micron resolution
        Slit height is adjustable from 0 - 10 mm
        Fiber optic coupling unit

The focal length of the telescope and collimator tube is 200 mm. The graduated disc features a 360 degree scale with divisions of 0.5. The prism table is removable and features three point bearing leveling screws.

Detector Unit

High precision low dark current (5pA) linear Si-Photodiode with an active area of 1.1 x 5.9 mm is used as detector in RE03DM Spectrometer Goniometer. It has spectral range of 320 - 1100 nm.

Application Include


Emission spectrum

Absorption spectrum

R.P of grating & prisms

Dichroism etc.

Angle measurements of equilateral prism, wedge prism, biprism etc. Refractive index measurements.


Determination of Groove spacing Wavelength Biprism diffraction etc.

Measuring Optical Parameters like

Optical density




Polarization angle etc.

Custom experiments using Theta Two Theta Goniometer

Holmarc's theta 2 theta stage consists of two rotation stages arranged in such a way that axis of rotation for both the stages are same. Both stages have preloaded ball bearing guides for wobble free rotation and positioning. 360º limitless movement is possible for inner and outer stages. Holmarc manufactures these stages with manual as well as motorized drive configurations.

Rotary graduations are provided in 1º / 2º with appropriate vernier graduations depending on the size of the stage. For motorized rotation stage, worm and gear is our standard drive mechanism. Surfaces of both stages are provided with M6 tapped holes for mounting components and sub-assemblies. Holmarc manufactures custom theta 2 theta stages to suit specific applications as well.

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