WITec UHTS Raman Spectrometer
All WITec's Raman microscopes are operated with ultra-high throughput spectrometers (UHTS) that were distinctively developed for high speed and high resolution Raman imaging. The UHTS series comprises of six models in several focal lengths to accommodate multiple laser excitation wavelengths (UV to IR) and spectral resolution requirements.
All UHTS spectrometers are lens-based and feature an optical fiber port, resulting in an overall transmission efficiency of up to 70%.
The automated triple-grating turret can host up to three gratings. Customers can choose from among a variety of gratings matching individual requirements in terms of spectral range and resolution.
On the detector side several types of CCD cameras with quantum efficiencies exceeding 90% can be attached.
The ultra-high throughput of the UHTS series enables up to 70 % transmission. They are specifically designed for challenging Raman imaging and spectroscopy applications with intrinsically low light intensities.
ULTRA-fast acquisition times
Utilizing our UHTS for data collection, the acquisition time for a single Raman spectrum can be reduced to below one millisecond per spectrum, providing essential benefits in Raman microscopy where commonly thousands of Raman spectra must be acquired.
ULTRA-sharp spectral information
WITec UHTS spectrometers deliver exceptional spectral and imaging quality. Symmetric peak shapes are ensured by design for coma/astigmatism-free spectra acquisition.
ULTRA-customizable triple-grating turret
An automated three grating turret incorporates the flexible integration and combination of individual gratings. Switching from one grating to another to accommodate varying experimental requirements has never been easier.
ULTRA-configurable: several focal lengths
The Raman spectrometers of the WITec UHTS series are available in several focal lengths to accommodate multiple laser excitation wavelengths and spectral resolution requirements for the most demanding Raman imaging experiments.
Specifications of all UHTS
- Lens-based imaging spectrometers
- Specifically designed for low light intensities
- Throughput >70%
- Symmetric peak shape (coma/astigmatism free)
- Automatic triple-grating turret
- FC/APC optical fiber port
- Can be fitted with FI- and BI-CCD cameras
- Controlled via WITec software
UHTS 300 VIS
For excitation in the visible range the UHTS 300 VIS provides outstanding dispersive peak separation capabilities. The focal length of 300 mm is in accordance with the required sensitivity for demanding Raman imaging applications.
UHTS 600 VIS
The UHTS 600 features an extended focal length of 600 mm for greater dispersion, which allows closely adjacent peaks to be resolved more readily. This new addition to the UHTS line enhances the chemical sensitivity and provides a high throughput at the same time. Therefore acquisition times for Raman spectra and images can be unparalleled fast.
UHTS 400 UV-VIS
With an optical system adapted and tailored for UV starting at 355 nm, the UHTS 400 UV-VIS expands Raman imaging capabilities even further when exciting with lasers at or below 488 nm.
UHTS 300 VIS-NIR
Applications requiring broadband excitation from the visible to the near-infrared can greatly benefit from the UHTS 300 VIS-NIR. This more affordable spectrometer is well suited for multiple laser configurations between 532 nm and 830 nm while maintaining the advantages of the UHTS family.
UHTS 400 NIR
In the near-infrared regime the use of specific NIR-optimized optical components is essential for high throughput spectral acquisition. A focal length of 400 mm, a specialized set of gratings, and state of the art deep depletion CCD technology combine to form an ideal solution for NIR Raman spectroscopy.
UHTS 300 IR
The UHTS 300 IR covers excitation ranges from 800 to 1700 nm featuring infrared optimized optical components, gratings and detectors for highly precise and accurate Raman and photoluminescence experiments.
WITec spectroscopic systems can be individually configured to meet sophisticated requirements in a great variety of applications. Several different types of CCD cameras with quantum efficiencies exceeding 90% can be attached to the UHTS series.
Front-Illuminated (FI) CCD camera
A front-illuminated CCD is characterized by a broad range of possible applications and wavelengths, generally oriented toward budget-conscious or basic experimental setups.
Back-Illuminated (BI) CCD camera
With a quantum efficiency of 95% or more, a back-illuminated CCD sets the industry standard for efficient Raman signal detection in the visible range. Compared to a front-illuminated CCD, they offer twice the quantum efficiency and are therefore suitable for precise and sensitive FAST RAMAN IMAGINGR at the highest lateral resolution. (UV-optimized versions are also available.)
Electron-Multiplying (EM) CCD camera
For sophisticated and leading-edge Raman applications, an EM CCD provides the most advanced readout capabilities for low light-level detection or ULTRA-FAST RAMAN IMAGING. Readout-speed can be as low as 760 µs per spectrum (1300 spectra/s) and dark currents as low as 0.0001 electrons/pixel per second.
Open Electrode (OE) CCD camera
The open electrode (OE) CCD is a front-illuminated camera that enables the acquisition of almost the entire spectral bandwidth and is specifically well-suited to measurements in the UV. In order to achieve state-of-the-art signal-to-noise ratios it features a low dark current and a multi-purpose camera functionality for various applications.
Low Dark-Current Deep Depletion CCD camera
Near-infrared (NIR) spectroscopic measurements of Raman and photoluminescence (PL) require specialized CCD detectors to prevent the spectral data from being influenced by “etaloning”, an effect that occurs when the Si-CCD chip materials become increasingly transparent to light at longer wavelengths. With the low dark-current deep depletion technology provided by this detector, critical NIR and PL experiments can be performed without signal loss.
InGaAs linear array detector
For scattering experiments above the Si-bandgap of approximately 1100 nm WITec supplies state-of-the-art Indium-Gallium-Arsenide (InGaAs) linear array detectors allowing for spectral imaging in the IR (up to 1700 nm) with peak quantum efficiencies near 90%.
Fiber-based Beam Delivery: Facts and Benefits
WITec uses the newest photonic fiber technology for highly efficient light transmission.
Your benefits are:
- Virtually lossless energy transmission
- Extremely efficient optical throughput
- Highest spatial resolution and confocality provided by the fiber-generated diffraction-limited point light source
- User-friendly operation and long-term stability through pre-configured and pre-aligned fiber-coupling units
- Most intricate polarization-dependent measurements feasible through maintenance of the polarization plane of light
- Reduced thermal or vibrational disturbances by lasers mounted distal of the microscope
Proven Measurement Power for High-Performance Raman Imaging
WITec spectroscopic systems enable the acquisition of Raman spectra, depth profiles and 3D images with exceptional spectral and spatial precision. This proven performance in speed, sensitivity and resolution is available without compromise or caveat, in your facility.
Capability, versatility and expandability for Raman spectroscopy – Optimized today, ready for tomorrow
WITec spectroscopic systems can be individually configured to meet exacting requirements in a great variety of applications. Our Raman imaging specialists are happy to consult you in order to define an optimized system for your individual applications and budget requirements. Even future ambitions can be taken into consideration as WITec systems are typically fully upgradeable, extendable and able to incorporate additional excitation wavelengths, scan stages and microscopic techniques: If your scientific approach changes, the WITec system can easily follow.
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