IsoPlane Spectrograph

The Best Spectrograph by Any Measure 

Powered by patented technology, IsoPlane spectrographs are designed for the most demanding applications.



The IsoPlane Imaging Spectrographs from Teledyne Princeton Instruments are simply the best spectrographs by any measure.

Powered by patented, award winning technology, IsoPlane is ready for the most demanding spectroscopy applications with the highest sensitivity and resolution. There are two models in the IsoPlane family, the original astigmatism free IsoPlane-320 and the more compact IsoPlane-160; both share vastly superior optical performance compared to similar focal length spectrographs.

High Fluence Design

  • IsoPlane provides higher signal to noise ratio than comparable focal length instruments

AccuDrive Triple Grating Turret

  • Dramatically improved wavelength accuracy and repeatability

Powered by LightField

  • Optional: LightField® (for Windows® 7/8, 64-bit)
  • LightField offers intuitive, cutting-edge user interface, IntelliCal, hardware time stamping, and more.


Model IsoPlane 160 IsoPlane 320
Focal Length 203mm 320mm
Aperture ratio f/3.88 f/4.6
PMT Spectral Resolution 0.13nm 0.05nm
CCD Spectral resolution (FWHM)* 0.16 nm or better across a 27 mm wide focal plane

0.07nm with ResXtreme (typ)

0.08 nm at all points on the focal plane

0.05nm or better with ResXtreme (typ)

Reciprocal linear dispersion



Wavelength coverage across 26.8 mm wide CCD

64nm (nominal) 41nm (nominal)

Focal plane size

27 x 14mm 27 x 14mm (standard) up to 27 x 22mm (optional)
Mechanical Scanning Range 0-1400nm 0-1400nm
Drive Step Size

0.005 nm/step

0.002 nm/step

Slits Continuously variable manual 10μm to 12mm. Motorized optional Continuously variable manual 10μm to 12mm. Motorized optional
Wavelength accuracy*

+/-0.2 nm (up to 0.02 nm with IntelliCal wavelength calibration)

+/-0.2 nm (up to 0.02 nm with IntelliCal wavelength calibration)

Wavelength repeatability*

+/-0.025 nm

+/- 0.015 nm


<100 μm at all wavelengths across the entire focal plane

Zero at all wavelengths

Spatial resolution (MTF)

≥12 line pairs/mm @ 50% modulation,measured at focal plane center

≥6 line pairs/mm @ 50% modulation, measured over 27 x 8 mm focal plane

≥15 line pairs/mm @ 50% modulation,measured at focal plane center

≥8 line pairs/mm @ 50% modulation, measured over 27 x 8 mm focal plane


Interchangeable triple-grating CTS-Turrets self-align to system when installed

Interchangeable triple-grating CTS-Turrets self-align to system when installed

Grating change repeatability

0.02 nm (typ.)

0.02 nm (typ.)

Certification CE CE
Dimensions L x W x H 29.97 cm x 24.89 cm x 21.84 cm (11.8” x 9.8” x 8.6”) 51.8 cm x 45.0 cm x 21.6 cm (20.4” x 17.7” x 8.5”)
Weight 6.8 kg (15 lbs) 25 kg (55 lbs)
*with 1200 g/mm @ 436 nm


Tip-Enhanced Raman Spectroscopy
TERS – Tip-Enhanced Raman spectroscopy

Laser-Induced Breakdown Spectroscopy
LIBS is considered one of the most convenient and efficient analytical techniques for trace elemental analysis in gases, solids, and liquids. LIBS spectra obtained by the Mars Curiosity Rover have confirmed that our sister planet could have harbored life

Fluorescence, Phosphorescence, and Photoluminescence Spectroscopy
Fluorescence, phosphorescence and photoluminescence occur when a sample is excited by absorbing photons and then emits them with a decay time that is characteristic of the sample environment.

Astronomical Imaging
Astronomical imaging can be broadly divided into two categories: (1) steady-state imaging, in which long exposures are required to capture ultra-low-light-level objects, and (2) time-resolved photometry, in which integration times range from milliseconds to a few seconds.

General Raman
The most common application of Raman spectroscopy involves the vibrational energy levels of a molecule. Incident laser light in the UV, visible or NIR, is scattered from molecular vibrational modes.

Surface-Enhanced Raman Spectroscopy
SERS – Surface-enhanced Raman spectroscopy

Coherent Anti-Stokes Raman Spectroscopy
Coherent Anti-Stokes Raman spectroscopy (CARS) a type of non-linear Raman spectroscopy. Instead of the traditional single laser, two very strong collinear lasers irradiate a sample.

Combustion researchers rely on laser-based optical diagnostic techniques as essential tools in understanding and improving the combustion process.

Singlet Oxygen Imaging
Singlet oxygen, the first excited state of molecular oxygen, is a highly reactive species that plays an important role in a wide range of biological processes, including cell signaling, immune response, macromolecule degradation, and elimination of neoplastic tissue during photodynamic therapy.

Plasma Emission Spectroscopy
The different types of plasma emission spectroscopy can be categorized by how the plasma is generated. Spectra of nuclear fusion plasmas are used to ascertain the chemical species present and other properties.

Resonance Raman Spectroscopy
Instead of fluorescence, some types of colored molecules produce strong Raman scattering at certain conditions. This effect was called Resonance Raman.

Stimulated Raman Scattering
Stimulated Raman scattering takes place when an excess of Stokes photons that were previously generated by normal Raman scattering are present or are deliberately added to the excitation beam.





Fundamentals of Spectroscopy

Technical Notes:

IntelliCal-Automated wavelength and intensity calibration routines significantly improve accuracy of recorded spectra
Automated wavelength and intensity calibration routines significantly improve accuracy of recorded spectra.

Fully automated wavelength calibration method optimizes data accuracy
Patent-pending IntelliCal® calibration technology from Princeton Instruments enables fast, reliable wavelength calibration with minimal user input.

Better Imaging with a Schmidt-Czerny-Turner Spectrograph
The IsoPlane spectrograph has a unique optical design that completely eliminates field astigmatism at all wavelengths and at all points across the focal plane, and reduces coma to negligible levels. This means the IsoPlane gives sharp and spatially well resolved images across the entire CCD sensor.

Improved Spectra with a Schmidt-Czerny-Turner Spectrograph
The data in this paper have shown that by decreasing optical aberrations and increasing fluence, the IsoPlane gives spectra with better spectral resolution and SNR compared to Czerny-Turner spectrographs. Higher spectral resolution means peaks that are too close together to be resolved by a CT spectrograph can be clearly seen with the IsoPlane.

Application Notes:

Analysis of Perovskite Solar Cells via Spectral Luminescence in the 700 to 1000 nm Wavelength Range
03/23/2018  The rapid development trajectory of perovskite solar cells (PSCs) is attributable to a multitude of ongoing research efforts that target technological challenges associated primarily with device stability and process uniformity. The ability to detect efficiency-limiting defects, for example, is playing a particularly critical role in both PSC fabrication and performance improvements.

Low-Frequency Raman Spectra of Amino Acids Measured with an Astigmatism-Free Schmidt-Czerny-Turner Spectrograph: Discovery of a Second Fingerprint Region
Low-Frequency Raman Spectra of Amino Acids Measured with an Astigmatism-Free Schmidt-Czerny-Turner Spectrograph: Discovery of a Second Fingerprint Region

Microscopy and Raman Imaging: Open-system Raman microscopy
Author: Cynthia Hanson and Elizabeth Vargis
05/05/2015  Publication: Laser Focus Wolrd
An IsoPlane 160 and a PIXIS 400 CCD camera are part of a cost effective Raman microscope solution developed at Utah State University. View the article in Laser Focus World.

Real-Time Imaging of Singlet Oxygen via Innovative Microspectroscopy Instrument
New Two-Dimensional InGaAs Detector Thermoelectrically Cooled to –85°C Facilitates Scientific Research

Scientific NIR-II/ SWIR Cameras Enable Femtosecond Frequency Comb Vernier Spectroscopy
New, Deeply Cooled InGaAs Cameras Provide Ultrahigh Sensitivity for Key Spectral Range

Aberration-Free Spectrographs and NIR-Sensitive InGaAs Cameras Facilitate the Development of Carbon Nanotube Optical Sensors for Early Disease Detection
Dr. Daniel Heller and his research group at Memorial Sloan Kettering Cancer center utilized the IsoPlane 320 spectrograph and NIRvana SWIR camera in their recent research.

Acquiring and processing Raman spectral data for the C2-D stretching vibration of 2 deuterated histidine
Because of histidine’s importance and unique functionality, we wanted to map out the probe group’s sensitivity to allow for its general use in protein related research.

Advanced CCD Cameras and Imaging Spectrographs Facilitate Acquisition of Novel Femtosecond Stimulated Raman Spectroscopy Data To Improve SERS Biosensors
Accurate characterization of surface-enhanced Raman spectroscopy (SERS) biosensors, fluorescent dye molecules that hold great promise for in vivo bioanalyte detection, can often be quite difficult as the overwhelming isoenergetic fluorescence signal typically makes it challenging to measure resonance Raman cross-sections for the molecules. To overcome this obstacle, researchers at the University of Minnesota in Minneapolis recently utilized etalonbased femtosecond stimulated Raman spectroscopy (FSRS), a technique designed to acquire a stimulated Raman signal without strong fluorescence or interference from signals resulting from other four-wave mixing pathway

Solar cell inspection via photoluminescence imaging in the NIR/SWIR
Scientific-grade, deep-cooled, large-format InGaAs FPA cameras such as the NIRvana from Princeton Instruments will enable researchers to observe photoluminescence emission at longer wavelengths and rapidly obtain more detailed information about defects within multicrystalline silicon solar cells.

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.

Low-frequency Raman Spectra of Carbon Nanotubes Measured with an Astigmatism-free Schmidt-Czerny-Turner Spectrograph
An IsoPlane has been interfaced to a low frequency Raman module that enables measurement of peaks with Raman shifts as low as 10 cm-1 using only a single stage spectrograph.

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