Product Description
Princeton Instruments Acton SpectraPro SP-2750i – 750mm Focal Length Imaging Spectrograph/Monochromator
A research-grade, 750mm focal length imaging spectrograph from Princeton Instruments’ renowned Acton SpectraPro series. The SP-2750i is a high-resolution, triple-grating instrument designed for advanced spectroscopic applications including Raman, photoluminescence (PL), laser-induced breakdown spectroscopy (LIBS), and plasma diagnostics. Built for maximum optical throughput, superior resolution, and imaging capabilities, this instrument represents the gold standard in research spectroscopy.
🔍 Key Specifications:
📐 Optical System:
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Model: SpectraPro SP-2750i (Acton series)
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Focal Length: 750 mm – excellent dispersion and resolution
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Aperture Ratio: f/9.7 (typical)
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Grating Turret: Triple grating turret (computer-selectable)
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Grating Size: 68 mm × 68 mm (standard)
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Wavelength Range: UV to NIR (dependent on gratings, detector, and coatings)
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Resolution: <0.02 nm (with 1800 g/mm grating, depends on slit width)
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Stray Light Rejection: Excellent – triple-grating design minimizes scatter
🔧 Mechanical & Scanning:
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Wavelength Drive: Precision stepper motor with encoder feedback
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Scanning Speed: High-speed scanning available
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Wavelength Accuracy: <0.05 nm (typical)
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Repeatability: <0.005 nm
📡 Imaging Capability:
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Imaging Spectrograph: Corrected optics maintain spatial resolution along slit
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Slit: Adjustable, micrometer-actuated
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Output Ports: Multiple ports (axial, lateral) for detector mounting
🖥️ Control & Interface:
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Control: USB, RS-232, or IEEE-488 (GPIB) options depending on vintage
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Software Compatible: Princeton Instruments WinSpec, LightField, or third-party control via LabVIEW, MATLAB, Python
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Accessories Compatible: Accepts Princeton Instruments CCD, ICCD, EMCCD, InGaAs, and PMT detectors
✅ Condition & Notes:
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Origin: University or government research laboratory decommission
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Cosmetic: Professional lab appearance – may show light handling marks. Optics presumed clean (not inspected internally).
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Operational Status: Untested – power not applied
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Includes: (1) Princeton Instruments Acton SP-2750i spectrograph body. No gratings, detectors, cables, or software included unless specified.
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Critical Disclaimer: Internal condition unknown. May require factory recalibration. Gratings may need replacement if damaged by environmental exposure.
⚙️ Why This Instrument is Exceptional:
🔬 750mm Focal Length – The Sweet Spot for High Resolution:
The 750mm focal length offers:
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Excellent dispersion – separate closely spaced spectral lines
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High spectral resolution – resolve fine structure in Raman, PL, atomic emission
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Large numerical aperture – high light throughput for weak signals
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Imaging capability – preserve spatial information along slit
🎯 Triple Grating Turret – Unmatched Versatility:
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Instant grating changes – switch between survey scans and high resolution without breaking vacuum/ purge
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Wide spectral coverage – from deep UV to NIR with appropriate grating sets
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Optimized for multiple techniques – Raman, PL, absorption, emission, LIBS
📡 Research-Grade Imaging Performance:
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Astigmatism-corrected optics – sharp images across entire focal plane
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Ideal for multi-track spectroscopy – fiber arrays, multi-sample analysis
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Compatible with 2D CCD/ICCD detectors – capture full spectral and spatial information
🏛️ Acton SpectraPro Heritage:
The Acton SpectraPro series is legendary in the spectroscopy community for:
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Mechanical robustness – precision components, stable over decades
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Optical excellence – superior imaging and stray light rejection
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Modularity – adapts to evolving detector and laser technologies
🛠️ Applications & Uses (If Restored/Functional):
🔬 Raman Spectroscopy:
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Confocal Raman microscopy – high-resolution chemical imaging
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Resonance Raman – UV/visible excitation studies
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Surface-enhanced Raman (SERS) – trace detection
💡 Photoluminescence (PL):
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Semiconductor bandgap analysis – quantum dots, 2D materials, perovskites
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Time-resolved PL – with ICCD or streak camera detection
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Cathodoluminescence – with electron beam excitation
⚡ Laser-Induced Breakdown Spectroscopy (LIBS):
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Elemental analysis – metals, minerals, environmental samples
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Standoff detection – with appropriate collection optics
🔋 Plasma Diagnostics:
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Fusion energy research – tokamak, stellarator plasma monitoring
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Industrial plasma processing – etch, deposition endpoint detection
🧪 Absorption & Emission Spectroscopy:
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Atomic absorption/emission – elemental quantification
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Molecular absorption – gas phase, solution studies
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Fluorescence – steady-state and time-resolved
🔭 Astronomy & Atmospheric Science:
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Solar spectroscopy – Fraunhofer line analysis
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Atmospheric remote sensing – DOAS, LIDAR receiver















