Complete Ultrafast Spectroscopy System HARPIA

  • Excellent performance at a high repetition rate
  • Measurement range from UV to MIR
  • Market-leading sensitivity
  • Modules for time-resolved, and multi-pulse experiments
  • High-level automation in a compact footprint


  • Excellent performance at a high repetition rate
  • Measurement range from UV to MIR
  • Market-leading sensitivity
  • Modules for time-resolved, and multi-pulse experiments
  • High-level automation in a compact footprint

The HARPIA comprehensive spectroscopy system performs a variety of sophisticated time-resolved spectroscopic measurements in a compact footprint. It offers an intuitive user experience and easy day-to-day maintenance meeting the needs of today’s scientific applications. Extension modules and customization options tailor the HARPIA system to specific measurement needs.

The system is built around the HARPIA-TA transient absorption spectrometer and can be expanded using time-correlated single-photon counting, Kerr gate and fluorescence upconversion (HARPIA-TF), third beam delivery (HARPIA-TB), and microscopy (HARPIA-MM) modules. HARPIA is designed for easy switching between measurement modes and comes with dedicated data acquisition and analysis software. Each module is contained in a monolithic aluminum body ensuring excellent optical stability and minimal optical path lengths.

For a single-supplier solution, the HARPIA spectroscopy system is combined with a PHAROS or a CARBIDE laser together with ORPHEUS series OPAs. HARPIA also supports Ti:sapphire lasers with TOPAS series OPAs.

  • Transient absorption and reflection in bulk and microscopy
  • Multi-pulse transient absorption in transmission
  • Time resolved fluorescence: Femtosecond fluorescence upconversion, Kerr gate, TCSPC
  • Femtosecond stimulated Raman scattering (FSRS)
  • Intensity-dependent transient absorption and reflection
  • Flash photolysis – nanosecond transient absorption
  • Charge transfer (electron, proton)
  • Solvation
  • Vibrational relaxation
  • Exciton energy transfer
  • Photoreaction dynamics
Measurement range 1) 350 – 1100 nm 460 – 1100 nm 460 – 1600 nm 350 – 1600 nm 2000 – 13000 nm
Pump range 240 – 2200 nm 240 – 700 nm
Delay range (resolution) 8 ns (8.3 fs) 4 ns (4.2 fs)
Temporal resolution ≤ laser pulse duration or better
Laser repetition rate 2) 1 – 200 kHz
Maximum data acquisition rate 3 kHz Laser repetition rate
  1. For laser pulse duration of up to 400 fs.
  2. Higher repetition rates available; contact for details.
Measurement range 450 – 1100 nm 450 – 1600 nm 350 – 1100 nm 350 – 1600 nm
Delay range up to 8 ms up to 500 μs
Delay resolution 100 ps
Temporal resolution 2 ns 1 ns
Maximum data acquisition rate 3 kHz
Mode Kerr gate Fluorescence upconversion TCSPC
Spectral range 250 – 1100 nm 330 – 820 nm 220 – 820 nm 1)
Pump range 240 – 2200 nm
Temporal resolution 400 – 500 fs ≤ laser pulse duration or better < 180 ps 2)
Max measurement range 8 ns ∞ 3)
Delay resolution 8.3 fs n/a
Gate beam requirements 20 – 25 μJ n/a
Compatible with TCSPC Kerr gate or fluorescence upconversion
  1. Spectral range is extendable to NIR; contact for details.
  2. High-speed detector available (< 50 ps); contact for details.
  3. Maximum measurement range depends on the phosphorescence signal.
Mode Pump for multi-pulse experiments NIR probe
Wavelength range 240 – 700 nm / 450 – 2200 nm 1600 – 2600 nm
Delay range (resolution) 4 ns (4.2 fs)
Spatial resolution 1) monochromatic polychromatic
< 2 µm < 10 µm
Full spectral range 460 – 1100 nm
Pump range 240 – 700 nm
Temporal resolution 500 fs
Maximum working distance 2) 13 mm
Sample motion range 13 × 13 × 13 mm
  1. White light generation has axial color at focus and wavelength-dependent mode size and NA. Focused white light will exhibit focus shift and spot size variation depending on the chosen spectral range. Polychromatic spot size is given at full spectral range, monochromatic is at 500 nm with a 10 nm bandwidth.
  2. Depends on the objective used.
Model Physical dimensions (L × W × H) 1)
HARPIA-TA 730 × 420 × 160 mm
Sample chamber area (L × W) 2)
205 × 215 mm
HARPIA-TF 571 × 275 × 183 mm
HARPIA-TB 670 × 252 × 183 mm
  1. Without external spectrograph.
  2. External sample placement option is available.

The HARPIA-TA ultrafast transient absorption spectrometer provides pump-probe measurement functionality in a HARPIA system. Several probe light configurations and detection options are available: from a photodiode for single‑wavelength detection to white-light supercontinuum probing combined with spectrally-resolved broadband detection. HARPIA-TA features extensive options providing pump beam position tracking and alignment, pump polarization control, supercontinuum generator switching, sample positioning, and switching between transient absorption and transient reflection measurements. Broadband probe options cover from UV to MIR. The probe delay stage is configurable up to 8 ns.

HARPIA-TA is compatible with cryostats, peristaltic pumps, and other accessories. The capabilities of the spectrometer can be further extended using extension modules.

The flash photolysis experiment is designed to measure the long-lived states of molecular systems. The principle of flash photolysis is analogous to the femtosecond transient absorption (TA) experiment but with a delay in a nanosecond–millisecond range.

Time-resolved fluorescence spectroscopy carries information on the molecular processes in the excited states. HARPIA-TF combines different measurement modes, thus allowing the observation of fluorescence dynamics at different time scales. Using a high-repetition-rate PHAROS or CARBIDE laser, the fluorescence dynamics can be measured while exciting the samples with pulse energies down to several nanojoules.​

  • Kerr gate
    Easy to use for fs fluorescence measurements. Simpler alignment and maintenance. The entire spectrum is measured at once.
  • Fluorescence upconversion (FU)
    Better temporal resolution for measuring fast fluorescence events.
  • Time-Correlated single-photon counting (TCSPC)
    Fluorescence lifetime measurements are extendible to measure phosphorescence signals.

When standard spectroscopy tools are not enough to unravel the intricate ultrafast dynamics of photoactive systems, multi-pulse time-resolved spectroscopic techniques can be utilized to yield additional insight. With HARPIA-TB it allows an additional temporally-delayed laser pulse (up to 4 ns) to be introduced before or during the pump-probe interaction to perturb the ongoing photodynamics.

  • Femtosecond stimulated Raman scattering (FSRS)
    Delivering frequency-narrowed ps pulses allows to perform FSRS measurements. It is a relatively recent yet moderately widespread time-resolved spectroscopy technique for observing changes in the vibrational structure of optically excited molecular systems.
  • Multi-pulse time-resolved transient absorption
    Multi-pulse time-resolved spectroscopic techniques are a way to manipulate the reactions and access new regions of the higher excited statesIt allows to time a series of pulses to trigger a photoreaction and to perturb it at a certain point of its ongoing evolution. In some cases, it is desirable to use a additional “pump” pulse to re-excite some of the molecules and depending on the delay between several pump pulses, the excitation might change the outcome of the reaction.
  • NIR probe 
    An additional narrow-bandwidth or broadband NIR probe option with a 4 ns delay is available, while retaining an 8 ns delay for UV-VIS experiments.

HARPIA-MM is a microscopy module add-on to the HARPIA-TA spectrometer, which enables spatially resolved pump-probe measurements. It allows the acquisition of time-resolved spectra at a fixed position, difference absorption images at a fixed probe delay, and other types of data.

The microscopy module features a motorized XYZ sample stage, broadband, and monochromatic probe options, as well as transmission and reflection modes, and brightfield mode to observe the sample and to determine the pump-probe spot location.


Switching between bulk and microscopic pump-probe modes is implemented using self-contained modules, allowing experiment reconfiguration without disturbing the sample.

  • Microscopy module
  • Bulk module

A single software solution for all measurement modes, featuring:

  • User-friendly interface
  • Measurement presets
  • Measurement noise suppression
  • Diagnostics and data export
  • Continuous support and updates
  • API for remote experiment control using third-party software (LabVIEW, Python, MATLAB)

An ultrafast spectroscopy data analysis software, featuring:

  • Advanced data wrangling: slicing, merging, cropping, smoothing, fitting, etc.
  • Advanced global and target analysis
  • Probe spectral chirp correction, calibration and deconvolution
  • Support for 3D data sets (2D electronic spectroscopy, fluorescence lifetime imaging)
  • Publication-ready figure preparation and data export

Solution-grown BiI/BiI3 van der Waals heterostructures for sensitive X-ray detection

R. Zhuang, S. Cai, Z. Mei, H. Liang, N. Zhao, H. Mu, W. Yu, Y. Jiang, J. Yuan, S. Lau et al., Nature Communications 1 (14) (2023).

Atomic structure of a seed-sized gold nanoprism

Y. Song, Y. Li, M. Zhou, H. Li, T. Xu, C. Zhou, F. Ke, D. Huo, Y. Wan, J. Jie et al., Nature Communications 1 (13) (2022).

Charge Photogeneration and Recombination in Fluorine-Substituted Polymer Solar Cells

R. Hu, Y. Liu, J. Peng, J. Jiang, M. Qing, X. He, M. Huo, and W. Zhang, Frontiers in Chemistry 10 (2022).

Cobalt(III) Carbene Complex with an Electronic Excited-State Structure Similar to Cyclometalated Iridium(III) Compounds

N. Sinha, B. Pfund, C. Wegeberg, A. Prescimone, and O. S. Wenger, Journal of the American Chemical Society 22 (144), 9859-9873 (2022).

Dopamine Photochemical Behaviour under UV Irradiation

A. Falamaş, A. Petran, A. Hada, and A. Bende, International Journal of Molecular Sciences 10 (23), 5483 (2022).

Effects of polyethylene oxide particles on the photo-physical properties and stability of FA-rich perovskite solar cells

R. K. Koech, Y. A. Olanrewaju, R. Ichwani, M. Kigozi, D. O. Oyewole, O. V. Oyelade, D. M. Sanni, S. A. Adeniji, E. Colin‑Ulloa, L. V. Titova et al., Scientific Reports 1 (12) (2022).

Electron–Hole Binding Governs Carrier Transport in Halide Perovskite Nanocrystal Thin Films

M. F. Lichtenegger, J. Drewniok, A. Bornschlegl, C. Lampe, A. Singldinger, N. A. Henke, and A. S. Urban, ACS Nano (2022).

Evidence and Governing Factors of the Radical-Ion Photoredox Catalysis

D. Y. Jeong, D. S. Lee, H. L. Lee, S. Nah, J. Y. Lee, E. J. Cho, and Y. You, ACS Catalysis, 6047-6059 (2022).


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HARPIA Complete Ultrafast Spectroscopy System

Product datasheet.

Rev. 22/05/2024. Size 0.9 MB.

Examples of Ultrafast Spectroscopy Applications

Application examples.

Rev. 22/05/2024. Size 6.2 MB.

Spectroscopy Systems

Product catalog.

Rev. 22/05/2024. Size 11.7 MB.

Femtosecond Laser Systems for Industry & Science

Product catalog.

Rev. 22/05/2024. Size 18.8 MB.


Product catalog in Chinese.

Rev. 14/03/2024. Size 17.8 MB.

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