FERGIE imaging spectrometer
With built-in high sensitivity CCD detector
The FERGIE is a revolutionary, compact, diffraction limited imaging spectrometer from Princeton Instruments – designed to make turn-key spectroscopy a reality.
The modular cube accessory ecosystem allows multiple experiments to be configured with ease – such as Raman, photoluminescence and flash photolysis (to name a few). The FERGIE includes the acclaimed LightField software for data acquisition and analysis, and a USB3.0 interface for plug-and-play operation with minimal setup/alignment.
- Low noise, back-illuminated , TE-cooled frame transfer CCD detector
- High spectral resolution, wide spectral range (200-1100 nm)
- Aberration-free imaging
- Modular cube accessory ecosystem
- Integrated programmable pulse generator
- Kinetics readout mode for µs time resolution
- Compact unit with small footprint
FERGIE Imaging Spectrometer
The unique optical design of the FERGIE eliminates optical aberrations - such as coma and astigmatism – that commonly plague mirror-based Czerny-Turner spectrometers. This is especially important for applications such as microspectroscopy and multi-track imaging, where diffraction–limited imaging performance is required over the entire focal plane and a broad spectral range.
A TE cooled detector (-45 deg C minimum) allows the use of long integration times for the detection of weak signals, and a high -peed frame transfer CCD detector negates the need for a mechanical shutter, whilst also enabling super-fast frame rates and µs temporal resolution.
The system can be optimised for the UV-VIS (200-1100 nm) or VIS-NIR (400-1100 nm) spectral ranges via a choice of a deep-depleted sensor and AlMgF2 or Silver coated optics.
Modular cube accessory ecosystem
A number of different cubes can be placed at the input of the spectrometer to configure the system for a variety of experiments. These include:
- Focusing cube with achromatic lens optimised for the UV, VIS or NIR
- Fibre port for connecting FC/PC fibres (includes aspheric collimating lens, VIS or NIR)
- Beam splitters; 50:50, 70:30, 90:10
- Sample chamber to hold 12.5 mm cuvettes
- Raman filter cube with built-in laser line filter and dichroic/edge filters – optimised for 785 nm excitation (532 nm options now available)
In addition to the cubes, we can also supply a 785 nm laser for turn-key Raman spectroscopy, switchable Hg/Ne-Ar light source for automatic wavelength calibration and a NIST traceable QTH light source for automatic intensity calibration.
FERGIE Emission Spectroscopy
Perhaps the most basic of the FERGIE’s capabilities is its use for emission spectroscopy. Emission spectroscopy measures the radiation emitted by materials as a function of wavelength. The setup for this is very simple: Light from a sample needs to be input to the FERGIE while it operates in the spectroscopic configuration (i.e. with a slit). With the correct selection of parameters within the software, you will achieve a clear spectrum of the input light which can be used to characterise or identify its source based on a reference.
Emission spectroscopy can be useful for:
FERGIE was designed with easy optical coupling in mind. The FERGIE entrance slit, which mirrors every cube, has a 1 inch SM1 threaded aperture that lets users couple FERGIE to imaging lenses and microscopes. Connecting FERGIE to a microscope is easily accomplished using an “SM1 thread to C-mount” adapter and the microscope’s “C-mount to side port” adapter.
FERGIE’s diffraction-limited imaging performance permits high-resolution images to be collected through a microscope and high-SNR spectra to be collected for the sample. In the case of spectra, this can be seen as a form of “point hyperspectral imaging” of the sample. This serves a variety of applications including:
Paint and dye analysis
If a full hyperspectral image is required for your application we also offer a full range of hyperspectral cameras which can give you a full spectra at every pixel of your image.
FERGIE Time-Resolved Spectroscopy
FERGIE has an internal timing generator (TG) with dual programmable trigger output lines, each of which can be swept in time/pulse duration to record the temporal evolution of photo-induced chemical reactions.
The FERGIE TG has separate programmable delay and width settings for each output, along with sequences (up to 1022 steps). Delay and width are programmed in 10 ns steps, up to 42 seconds, allowing easy pump-probe spectroscopy experimental setup.
The TG works with kinetics spectral mode, permitting effective shutter times equal to the vertical shift rate multiplied by the number of rows of the horizontal binning in the kinetics window. This capability allows the FERGIE to be configured to perform flash photolysis.
FERGIE Absorption/Transmission Spectroscopy
FERGIE can easily be configured to perform absorption or transmission spectroscopy. These techniques both measure the radiation absorbed by materials as a function of wavelength. Absorption of radiation as described by quantum mechanics is due to the excitation of a molecule/atom from one energy state to an excited state after absorbing a photon or photons:
Microwave (THz): rotational
NIR: vibrational overtone and combination
X‐ray: inner shell electron excitation
Setup is simple with a single Sample Chamber CUBE and two fibre ports. Absorbance measurements are established in minutes. The stabilized QTH source is ideal for absorbance measurements as well as relative intensity calibration. The QTH lamp also houses a ½ inch filter holder that allows users to insert order-sorting, long-pass, or short-pass filters in-line with the lamp. By utilising the Beam Splitter CUBE, a live reference channel can be added.
Absorption spectroscopy technologies are widely used in many researches and industries including:
FERGIE Raman Spectroscopy
Raman spectroscopy is widely used for chemical identification and quantification in many different research fields. Raman spectroscopy works in this regard because Raman scattering is an inelastic process where the scattered light has a wavelength shift due to the interaction of the incident light with the dipole moments of the molecules being probed. The wavelength shift in Raman scattering is determined by the vibration modes of the molecules under investigation. The intensity of the scattering is also determined by molecular structure (induced dipole moment). Since Raman scattering is considered a ‘weak’ effect with a cross section orders of magnitude lower than fluorescence or absorption, a laser is used as light source for its brightness and monochromatic properties. Raman Spectroscopy has several advantages over other techniques:
No sample preparation
Work for gas/liquid/solid samples
Fingerprint spectral information
Good for IR inactive species
The FERGIE system has cubes accommodating Raman setups using 785 nm and 532 nm excitation lasers.
The spectral information gathered through Raman techniques is dependent on the wavelength of the probing radiation used on the sample. While Raman measurements at 785 nm are preferred for organic and biological samples that have fluorescence background, Raman measurements at 532 nm offer better sensitivity with a higher Raman cross-section and better spatial resolution comparatively. 532 nm Raman analysis is much more suitable when looking at carbon, semiconductor, and thin film materials.
Applications for the Raman spectroscopy include:
Geology and mineralogy
FERGIE Raman Microscopy
Raman microscopy combines the power of two commonly used analytical technologies. It allows one to image the sample both optically and chemically be taking Raman spectra at desired points of the imaged sample.
With the FERGIE, this is done by using additional illumination components when compared to the Raman spectroscopy setup, and a sample translation stage is used to direct the Raman laser to the point of the imaged sample that a spectrum is to be taken on.
Applications for Raman microscopy include:
Many interesting phenomena emerge at cryogenic temperatures, and often, additional or new information about a sample can be obtained with temperature dependent measurements. Due to the low cross section for Raman scattering, optical throughput and detector sensitivity are critically important, particularly when performing 2D mapping or temperature dependent studies on low dimensional materials.
In conjunction with Montana Instruments Cryostations, FERGIE allows for free space Raman signal collections from cryogenic samples. This variable temperature Raman microscope integration is optimized for high collection efficiency and throughput, offering an automated and controlled environment for characterising materials with standard spectroscopic techniques.
Characterisation of low-dimensional material properties, enable work in the following fields:
Precise sample temperature control from 4K - 350K, enables the study of:
Molecular Thermal Activities
Crystal Structure Changes
This Cryo-Raman setup allows the following measurement techniques:
Raman Microscopy and Imaging
Photoluminescence Spectroscopy and Imaging