Products: LS Series Lens Spectrographs

image of LS Series Lens Spectrographs

High-Throughput NIR Spectrometers

The Acton Series LS-785 is a high-throughput, lens-based spectrograph ideal for near-IR spectroscopy. It features a fast f/2 optical system with proprietary AR-coated lenses for optimum NIR transmission. At an aperture of f/2, the LS-785 is perfectly matched to .22 NA optical fibers and achieves up to 4x the throughput of a standard f/4 mirror-based spectrograph. With its fast AR-coated compound lenses from our Acton Optics group and a custom gold-coated grating, the LS-785 provides the highest throughput and best imaging commercially available for the NIR. The LS-785 also includes micrometer-controlled grating rotation, allowing users to access the NIR between 750 nm and 1100 nm.

LS 785 features include:

  • Fast f/2 optics
  • High-transmission, AR-coated elements
  • Excellent image quality
  • Micrometer-controlled grating rotation
  • Micrometer focus adjustment
  • Seamless integration with high-performance Princeton Instruments cameras
  • Powerful, 64-bit LightField software


The LS-785 gives users a significant advantage in terms of both acquisition time and spatial integrity for demanding Raman spectroscopy applications. Combined with renowned Princeton Instruments PIXIS or PyLoN deep-depletion CCD detectors, the LS-785 delivers the highest possible throughput and performance.

Applications for the LS-785 spectrometers include

  • Raman spectroscopy
  • NIR absorption spectroscopy, tissue studies
  • Multichannel spectroscopy
  • Microspectroscopy spectroscopy
  • Fluorescence spectroscopy
  • Photoluminescence spectroscopy

Click to enlarge. Outstanding Spectral Resolution 5 cm-1 resolution accommodates a wide variety of NIR Raman applications


Acton LS Series Lens Spectrographs model comparison and datasheets

Model Focal Length Aperture Ratio Resolution Dispersion Grating
Acton LS 785 datasheet pdf 85 mm f/2.0 5 cm-1
with 25 µm fiber
6.13 nm/mm @ 900 nm gold coated
1200 g/mm



Application Notes

NIR Spectroscopy Aids in the Diagnosis of Neonatal Brain Injury
Over the past several years, biomedical researchers and engineers working in labs, hospitals, and universities around the world have developed an extensive set of spectroscopy-based methods — including a new class of noninvasive in vivo techniques utilizing near-infrared spectroscopy (NIRS) — to facilitate the rapid and accurate detection and diagnosis of disease and injury.

Using Raman Spectroscopy to Detect Malignant Changes in Tissues
Accurate, rapid and non-invasive detection and diagnosis of malignant disease in tissues is an important goal of biomedical research. Optical methods, such as diffuse reflectance, fluorescence spectroscopy, and Raman spectroscopy, have all been investigated as ways to attain this goal.

Ultra-High-Speed, Time-Resolved Spontaneous Raman Scattering Spectroscopy in Combustion
The recent use of a new diagnostic apparatus to measure the dynamics of each individual molecular species, as opposed to simply acquire bulk information (e.g., pressure), points to the possibility of performing temperature and frequency analyses of species in combustion.


Product Manuals
Download operation manuals for Princeton Instruments cameras, spectrometers, and accessories from our ftp site.

PIXIS CCD Cameras for Imaging & Spectroscopy

PIXIS CCD Cameras for Imaging & Spectroscopy

PIXIS CCD cameras play a key role in revolutionary research performed in leading labs around the world.

LightField Scientific Imaging & Spectroscopy Software

LightField Scientific Imaging & Spectroscopy Software

Ground breaking software to control your Princeton Instruments systems. Now with Windows 10 support. It's like nothing you have ever experienced!

PyLoN Cameras for Imaging & Spectroscopy

PyLoN Cameras for Imaging & Spectroscopy

PyLoN high-resolution front-illuminated, back-illuminated, & back-illuminated deep-depletion imaging & spectroscopy CCDs.

Princeton Instruments