Raman Explorer Spectrograph

The Raman Explorer series of multi-channel, multi-spectrum spectrographs has been developed based on Headwall Photonics’ patented, aberration-corrected, retro-reflective concentric design. The novel and high reciprocal dispersion instrument provides high signal throughput of weak Raman spectra, and shortened integration time for measurements. The solution offers spectral imaging for more challenging Raman applications.

The spectrographs have a unique design that allow multiple spectral ranges to be dispersed over a single CCD with outstanding spectral bandwidth, photometric accuracy, and resolution.

Model   532 658 632.8 632.8 785 785
Parameter Units Ch 1 Ch 2 Ch 1 Ch 2 Ch 1 Ch 2
Laser stimulation nm 532 658 632.8 632.8 785 785
Minimum Stokes Shift cm-1 300 79 100 2982 -98 2256
Maximum Stokes Shift cm-1 3671 2408 3072 4667 2419 3998
Avg. Recip. Linear Disp. cm-1/pixel 1.87 1.3 1.57 1.13 1.23 0.85
Nominal Spectral Resolution cm-1 5.6 3.9 4.7 3.4 3.7 2.6

Key Features

The main features of the Raman Explorer spectrograph include:

  • High spatial resolution, spectral resolution, dynamic range and signal throughput
  • Original high efficiency imaging grating
  • Maximum multi-channel input capacity
  • < 4 cm-1 resolution with 785 nm excitation
  • No image curvature
  • Superior 1:1 straight slit imaging
  • f/2.4
  • Maximum signal collection
  • Excellent resolution over the entire focal plane
  • 100% increase in signal collection versus other straight line entrance aperture spectrometers
  • No stray light “noise” commonly caused by transmissive optics, replicated diffraction gratings or multiple diffracted orders

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