EOS - Ultrafast Systems LLC

EOS is a broadband pump-probe sub-nanosecond transient absorption spectrometer with an extended time window. Its patent pending design utilizes a photonic fiber for probe light generation.

To the researchers using femtosecond transient absorption for studying ultrafast kinetics of photoinduced processes it is often desirable to extend the time window of investigation beyond several nanoseconds. The most widely used method in this case is Nanosecond Flash Photolysis. This technique requires a dedicated Q-switched laser with accompanying wavelength conversion equipment, laser table, additional flash photolysis spectrometer, etc. Outside of the need to set up an additional laser spectrometer, the main disadvantage of this method is its relatively low time resolution – a typical IRF in the nanosecond flash photolysis experiment is 7-10 ns. Therefore even when combined the above two methods often do not allow for reliable measurements of sub-10 ns lifetimes. The EOS with its ~500 ps time resolution and the electronically controlled pump-probe delay presents a perfect solution and in combination with the HELIOS provides continuous temporal coverage from femto- to milliseconds and beyond.

Features:

Bridges the gap between ultrafast and nanosecond flash photolysis timescales
Performs transient absorption experiments with IRF of <500 ps and a maximum time window of several seconds
Acquires transient spectra over a broad wavelength range (400-1700 nm)
Transient Absorption Anisotropy Option
Probe Reference (Standard)

For more details and pricing information please contact us.

Probe Spectral Range:

• 400-900 nm
• 800-1700 nm

Spectral Resolution:

Spectral resolution of the spectrometers inside of Eos can be adjusted to customer’s requirements.
Standard spectral resolution:
• VIS – 1.5 nm
• NIR – 3.5 nm

Time Window:

From nanoseconds to seconds

Temporal Resolution:

The instrument response function is 500 ps. The minimum time step size is 50 ps.

Transient Absorption Anisotropy:

An optional extension to Eos allows for transient absorption anisotropy measurements.

Probe Reference:

The Eos utilizes a two-channel probe or “probe-reference” method. In this approach the probe beam is split into two before passing through the sample. While one leg travels through the sample, the other is sent directly to the reference spectrometer that monitors the fluctuations in the probe beam intensity. The main advantage of this technique is that it allows the user to achieve the specified signal-to-noise ratio with a lower number of averaged laser pulses.

Data Format:

The Eos produces a 3-Dimensional Wavelength-Time-Absorbance data matrix in a form of an ASCII CSV file, which can be easily processed with our software or third party software.

VIS Detector:

Fiber optics coupled multichannel spectrometer with CMOS sensor with 1.5 nm intrinsic resolution. Sensitivity range: 350-850 nm. Maximum spectral acquisition rate - 2500 spectra/s. Can be mounted away from the Eos enclosure.

NIR Detector:

Fiber optics coupled multichannel spectrometer with InGaAs sensor with 3.5 nm intrinsic resolution. Sensitivity range: 800-1600 nm. Maximum spectral acquisition rate - 7900 spectra/s. Can be mounted away from the Eos enclosure.

Laser frequency range:

~1000 Hz

Software:

Data acquisition:
LabView based software for instrument control and data acquisition. The software allows for experiment automation, such as present optics delay step sizes, averaging time for each transient spectrum, time window. Alternatively user can adjust the above parameters during the data collection process. Random delay line stepping is available for the above regimes.

Data analysis:
Eos comes with a complete data acquisition Eos^TM and data analysis Surface Xplorer^TM software package. Please refer to the Surface Xplorer section for more details.

Dimensions:

W24” x L36” x H10” (W610 x L915 x H250mm)

For more details and pricing information please Contact Us

EOS Advantages:

Easy and quick installation
Easy accommodation of harmonic generators and OPAs
User-friendly
Can be fully integrated into HELIOS to provide continuous temporal coverage from femtoseconds to seconds
Superb data analysis software tool
Proprietary spectrograph design for greater light sensitivity and higher signal-to-noise ratio
State-of-the-art multichannel sensors
Spectrum shaping filters
Performs transient absorption measurements with low excitation energy, orders of magnitude lower than in a typical nanosecond experiment
Uses your existing femtosecond light source for excitation. No need for a nanosecond laser
Top quality components:
- Motion and vibration control (Newport)
- Detectors (Hamamatsu, Goodrich)
- Gratings (JY Horiba)
- Electronics (National Instruments)
- Optics and optomechanics (Newport, ThorLabs, CVI)
1-year warranty including free travel to customer’s site. Unlimited phone and on-line customer support.

ACCESSORIES		DESCRIPTION
Apollo		Femtosecond Harmonics Generator with outputs at the fundamental, 2nd and 3rd harmonics of the Ti:Sapphire laser output.
Transport Optics		Transport optics kits for routing the laser output to our spectrometers.
Surface Xplorer		The Surface Xplorer software makes working with 3D time-resolved data fast and efficient. It combines strong presentational features including simultaneous 3D and 2D data display with powerful data analysis capabilities such as nonlinear fitting, SVD and Global Analysis.
2D Translating Sample Holder		Motorized, computer controlled 2-D sample holder. Maximum translation area – 11x11 mm2. Sample holder controls are integrated into the spectrometer software. The stage is used for solid samples to minimize photodegradation effects on a kinetic profile. LabVIEW based software is included.
High Speed Spectrometer		These spectrometers are designed to provide the maximum light throughput in HELIOS and EOS spectrometers. They consist of an imaging spectrograph and a high-speed multichannel detector. The spectrograph utilizes a high-efficiency, ion-etched, aberration corrected holographic grating. The highly sensitive detectors can be saturated with only 20-30% of a single femtosecond continuum pulse. Therefore their full dynamic range can be utilized with even strongly absorbing samples. The spectrometers can support multi-kHz sampling rates.

Contact Ultrafast Systems for more information about this product