HELIOS IR
MID-IR Femtosecond Transient Absorption Spectrometer
HELIOS IR is a broadband mid-infrared pump-probe femtosecond Transient Absorption Spectrometer. A complete turn-key system, HELIOS IR can measure photoinduced absorbance changes across a broad (2-13 µm) spectral range with femtosecond time resolution over an 8 ns time window. At any time, the HELIOS IR time window can be extended to sub-milliseconds with an EOS IR add-on.
Probe spectral range
Typically 2-13 µm. Extendable to 20 µm.
Variable spectral resolution and spectral range
When Helios-IR is used with an array (multipixel) detector it is necessary to be able to vary the resolution with which the probe spectrum is imaged on the sensor. This allows to ensure that the desired spectral features are resolved and to also control the acquired spectral range. For this we utilize a three-grating imaging spectrograph (320 mm; f/4.1) to allow for different detection bandwidths and spectral resolution.
The system comes standard with the following gratings:
Grating number Groove density, g/mm Blaze wavelength, nm Recommended spectral range, µm Linear dispersion @ blaze wavelength, nm/mm Linear dispersion @ blaze wavelength, nm/pixel Linear dispersion, cm-1/pixel 1
300
4000
2 – 5
6.97
1.74
1.09
2
150
4000
2.2 – 9
18.4
4.60
2.89
3
50
6000
3 – 12
55.2
13.8
8.65
Custom gratings are available on request.
8 ns time window. Extendable to ms.
The nanosecond window is achieved by using a direct-drive high speed optical delay line. Custom designed mounts are employed for the delay line optics to increase the beam alignment reproducibility and the overall reliability. This delay line features high resolution as well as high speed. Scanning at high speeds is very important because it allows for pseudo-random stepping without a significant increase in the experiment time. This type of stepping is very useful for minimizing the effects of laser instability and sample degradation.
The standard 8 ns time window extendable to milliseconds with the EOS add-on.
Optical delay line specifications:
Time window: 8 ns
Resolution: 14 fs
Minimum step size: 2.8 fs
Max. speed: >10 ns/s
Acceleration: > 260 ns/s^2
Automated alignment time: 3-5 min
Beam pointing drift: <10 µm over 8 ns delay range
Detectors
Helios-IR can be configured with various MCT detector options, including dual multipixel arrays.
Available MCT detector configurations:
Single-pixel elements
1×2 (two single pixel detectors with probe reference)
Multi-pixel arrays
32 pixels
64 pixels
128 pixels
Dual multi-pixel arrays (with probe reference)
16 pixels x2
32 pixels x2
64 pixels x2
Large sample area – 255 mm x 300 mm
The spacious sample compartment allows for easy mounting of various cryostats and temperature-controlled sample holders. Also, simply having more space around the sample makes working with your samples simpler.
Dimensions
Optical bench:
W34” x L56” x H14” (W864 x L1425 x H356 mm)
Electronics rack:
W21” x L24” x H27” (W534 x L610 x H686 mm)
HELIOS IR features versatile and user-friendly LabVIEW based software for instrument control and data acquisition.
The software is also very user-friendly and versatile:
Automated alignment of the optical delay line.
Supports computer controlled translating sample holder.
Supports pump beam shutter.
Supports motorized filter wheel for automated pump intensity control.
Saves every individual kinetic scan, so if experiment is aborted (due to laser fluctuations, power outages, etc.) all previous scans are not lost.
Threshold adjusted automatic probe intensity spike rejection –advanced setting which collects data points again if the probe is not stable.
Support for multiple choppers to facilitate customized experiments.
API (Application Programming Interface) for HELIOS IR is provided for further experiment customization and integration with external applications.
商品属性 [波长范围] 2-13 µm