…SEE the Future
Acton LS 785
From conception Princeton Instrument’s Acton LS 785 design was specifically
optimized for use in the NIR. The unique f/2 lenses, designed in-house, feature
proprietary coatings developed by Acton Research Coatings group. Each
surface of the five element lenses has a better than 99% antireflection coating.
The high aperture and transmission provides more than twice the throughput of
the closest competitive product. The lenses were designed for best MTF in the
region between 750nm and 1000nm. The result is unmatched image quality and
the lowest aberrations possible over its 27 mm x 8 mm focal plane. The Raman Pro
785 provides a significant advantage in acquisition time and spatial integrity in
demanding Raman imaging applications. A very compact footprint and 5cm-1
resolution make it well suited for transportable applications such as medical and
process diagnostics.
Applications: NIR Raman spectroscopy and imaging / NIR fluorescence
Features
Benefits
Working range between
750 nm and 1000 nm
Provides wide spectral coverage for 785 nm to 830 nm lasers: 400 cm-1 to 2,300 cm-1 with a 785nm
laser; 300 cm-1 to 2000 cm-1 with an 830 nm laser Coverage can be adjusted via micrometer drive
5cm-1 resolution
Sufficient resolution for the most demanding biological, medical, and analytical applications
NIR optimized f/2 refractive
optics
Provides the higest throughput and spatial integrity available in the NIR
Gold grating
Offers the highest efficiency as well as flattest response in the working spectral region
Custom designed AR coatings Every optical surface in the lens assemblies have better than 99% transmission over the entire working
range of the spectrograph
No moving parts
Extremely reproducible and stable
Internal Raman edge filter
A Raman edge filter with 8OD rejection incorporated in lens design reduces the need for several
optical and mechanical components and increases efficiency
Offered with the widest range Couples with all Princeton Instuments CCD detectors including TE and LN cooled as well as intenstified
of CCD detects
and EMCCD models. An optional internal CCD shutter mechanism is available
Wide range of accessories
available
Including fiber adapters, filter assemblies, micro and micro Raman sampling systems,
and lasers
Acton LS 785 Rev A0
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…SEE the Future
Acton LS 785 Specifications
Focal length
85 mm
Aperture
f/2
Optics
Proprietary designed and AR coated
refrative lenses
Grating
Gold coated 1200g/mm
Focal plane
27 mm x 8 mm
Gold coated
grating
Wavelength coverage 785 nm to 1000 nm manually tunable
via removable micrometer
Dispersion
6.23 nm/mm
Resolution
5 cm-1 with 25μm fiber
Throughput
> 75% (unpolarized light)
Size
370 mm long 180 mm high 234 mm wide
Weight
7.5 kg
Colimating lens
Focusing
lens
Internal
CCD shutter
Relative wavenumber coverage
Laser (nm)
working range
(cm-1)*
Coverage
(cm-1)
Lowest range covered (cm-1)
Highest range covered (cm-1)
785
250 to 3215
1985
250 to 2234
1230 to 3215
805
250 to 2898
1884
250 to 2134
1015 to 2898
830
250 to 2524
1768
250 to 2018
756 to 2524
* Range limited by edge filter cut of and 1050 nm practical detection wavelength of Si based CCD cameras
Recommended Detectors
PIXIS: 100/400 BR
100/400 x 1340 20 x 20μm pixels back illuminated deep depletion CCDs
PIXIS: 256 BR
1024 x 256 26x26μm pixels back illuminated deep depletion CCD
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
Note: 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.
Acton LS 785 Rev A0
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…SEE the Future
Selected Ne Lamp NIR Spectral Lines
837.6
Superb spectral resolution
across the entire focal plane
849.5
813.6
811.9
800
878.4
830.0
863.5
820
840
wavelength (nm)
865.4
860
878.1
880
A line of 19 200 micron fibers imaged across the 27 mm by 8
mm focal plane demonstrates the field flatness
Acton LS 785 Drawings
10.2"
257.9mm
11.3"
286.9mm
1.2"
30.4mm
14.5"
367.9mm
13"
331.4mm
840.9
839.8
841.8
5.3"
133.3mm
FOCAL PLANE
3X
.201 EQUALLY SPACED
WITHIN 3.88 B.C.
CLEARANCE HOLES FOR
#10-32 BUTTON HEAD SCREWS
7.1"
179.5mm
3X #10-32 TAPPED MOUNTING HOLES
EQUALLY SPACED WITHIN 3.60 B.C.
9.2"
233.7mm
6.1"
154mm
2.9"
73mm
3.4"
87.3mm
DETECTOR MOUNTING FLANGE
ALL DIMENSIONS ARE SHOWN APPROXIMATE
www.piacton.com
email: [email protected]
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France +33 (1) 60.86.03.65 | Germany +49 (0) 89.660.779.3
Japan +81.3.5639.2741 | UK +44 (0) 28.38310171
Asia/Pacific +65.6293.3130
Acton LS 785 Rev A0
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