Helios IR

MID-IR Femtosecond Transient Absorption Spectrometer

Probe Spectral Range: 2-13 µm
Automated
Extended Time Window
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.
Features & Specs

Probe spectral range

Typically 2-13 µm. Extendable to 20 µm.

Variable spectral resolution and spectral range

In Helios IR we use our proprietary design imaging monochromator, which is optimized to match the rest of the spectrometer optics. With its four-grating turret and variable slits, you can easily control the detection bandwidth and spectral resolution. Which is perfect for working with multipixel MCT arrays.

Typically Used Gratings

Spectral Range

6-16 µm

3-10 µm

2-7 µm

Groove Density, g/mm

50

75

150

Blaze Wavelength

9 µm

4.65 µm

3 µm

Linear Dispersion, nm/mm

63.6

42.4

21.3

Mechanical Resolution, nm

3.8

2.5

1.3

Minimum Step Size, nm

1.7

1.2

0.57

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 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 significantly increasing 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 multi-pixel arrays.

Available MCT detector configurations:

Single-pixel elements

1×2 (two single-pixel detectors with probe reference)

Single-pixel elements

32 pixels

64 pixels

128 pixels

Dual multi-pixel arrays (with probe reference)

16 pixels x2

32 pixels x2

64 pixels x2

Single-pixel detector

Multi-pixel detector

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

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.

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)

Software

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 the experiment is aborted (due to laser fluctuations, power outages, etc.) all previous scans are not lost.

  • Threshold adjusted automatic probe intensity spike rejection – an advanced setting that collects data points again if the probe is not stable.

  • Support for multiple choppers to facilitate customized experiments.

  • API (Application Programming Interface) for EOS IR is provided for further experiment customization and integration with external applications.

Applications

Helios IR can be used to monitor photoinduced species absorbing in the mid-infrared spectral region. For example, vibrationally excited states, charge carriers and electronically excited states in low band gap nanomaterials, etc.

Some research areas where HELIOS IR is useful are:

Photophysics

Materials science

Photochemistry

Nanoscience

Photobiology

Transient spectrometry

Cell biology

Many more areas

Brochures & Examples

Helios IR can be used to monitor photoinduced species absorbing in the mid-infrared spectral region. For example, vibrationally excited states, charge carriers and electronically excited states in low band gap nanomaterials, etc.

HELIOS IR Brochure

HELIOS IR. Femtosecond Transient Absorption Of Mn2(CO)10 In Mid-IR.

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