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Chapter 1 -- General
Description
The Acton LS 785 is an 85 mm focal length high throughput lens spectrograph specifically designed and
optimized for near infrared (NIR) applications. The system features fast f/2 lenses for maximum light gathering
power and proprietary anti-reflection coatings for exceptional throughput from 750-1050nm. The unique multi-
element f/2 lenses provide a flat 2D focal plane optimized for a wide variety of Princeton Instruments CCD
detectors up to 8 mm x 27 mm.
Gold-coated plane reflection gratings are used in the LS 785 providing resolution capability of 5cm-1. Each
grating is provided on a kinematic mount to enable easy interchanging when required. The standard LS 785 also
features micrometer-controlled grating rotation which allows the user to change wavelengths in order to explore
different spectral regions of interest.
Features and Benefits
Highest Light Throughput, Exceptional Image Quality, Greatest Versatility
Easy wavelength adjustment allows use of Raman excitation lasers from 785nm to 830nm
Fast f/2 optical system is ideal for direct fiber optic coupling. No additional f# matching optics required.
Use with a wide variety of Princeton Instruments CCD detectors, including our back-illuminated deep-
depletion NIR CCD detector for unmatched signal-to-noise performance.
When purchased with a Princeton Instruments CCD detector, the LS 785 is normally focused and aligned
at the factory and shipped as a complete system, ready to operate.
Recommended Detectors
Sensitivity is a critical issue in NIR Raman spectroscopy. Not only is the Raman signal weak due to the longer
excitation wavelengths, the efficiency of CCD-based detectors fall off very quickly in the NIR. Princeton
Instruments recommends that back illuminated deep depletion sensors be used in this region. The following
models will give you the highest sensitivity in the NIR.
PIXIS 100/400 BR: 100/400 x 1340 20 x 20um pixels back illuminated deep depletion CCDs
PIXIS 256 BR: 1024 x 256 26x26um pixels back illuminated deep depletion CCD
Optionally available detectors: (shipped in separate packaging – see Appendix B for CCD adapters)
Spec-10 100LN BR: Liquid nitrogen cooled version of the PIXIS 100 BR
Spec-10 256LN BR: Liquid nitrogen cooled version of the PIXIS 256 BR