LightForm_Logo
Copyright © LightForm Inc, 2017
LightForm Inc: Pioneering Analytical Hyperspectral Microscopy Since 1996

A Prism Based Hyperspectral Microscope Provides Greater Sensitivity

Than A Diffraction Grating Based Spectrometer.

diffraction orders from a 150 g/mm diffraction grating CCD Light dispersion through a prism Prism bottom line: Glass transmits up to an unbeatable 95% of all light from 365 to 1000 nm compared to the max efficiency of <60% at only one wavelength for most diffraction gratings! CCD
Sample
Prism spectrometer schematic
Curved Prism and Reflector
Spectrum CCD
Entrance slit
PARISS spectrometer optical geometry
Entrance slit
Monochromatic light splits into 25 ORDERS presented as beams of light due to high order diffraction (Play the Movie) White light creates multiple “rainbows” The CCD catches just a portion of the signal.  All light diffracted outside the CCD is lost.
Diffraction grating based imaging spectrometer with a typical 150 g/mm grating
Spectrum CCD
Spectrum CCD
Entrance slit Video hyperspectral microscope: prism vs diffraction grating
This video compares the differences in performance between a diffraction grating and a prism in a hyperspectral instrument . Conclusion: A prism delivers significantly greater sensitivity than a diffraction grating
LightForm_Logo
Copyright © LightForm Inc, 2017
LightForm Inc: Pioneering Analytical Hyperspectral Microscopy Since 1996
A Prism Based Hyperspectral Microscope Provides Greater Sensitivity Than A Diffraction Grating Based Spectrometer.
diffraction orders from a 150 g/mm diffraction grating CCD Prism bottom line: Glass transmits up to an unbeatable 95% of all light from 365 to 1000 nm compared to the max efficiency of <60% at only one wavelength for most diffraction gratings!
Sample
Prism spectrometer schematic
Curved Prism and Reflector
Spectrum CCD
Entrance slit
PARISS spectrometer optical geometry
Entrance slit
Monochromatic light splits into 25 ORDERS presented as beams of light due to high order diffraction (Play the Movie) White light creates multiple “rainbows” The CCD catches just a portion of the signal.  All light diffracted outside the CCD is lost.
Diffraction grating based imaging spectrometer with a typical 150 g/mm grating
Spectrum CCD
Spectrum CCD
CCD Entrance slit Video hyperspectral microscope: prism vs diffraction grating
This video compares the differences in performance between a diffraction grating and a prism in a hyperspectral instrument . Conclusion: A prism delivers significantly greater sensitivity than a diffraction grating