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
- Reflection mode
Features
- 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
- Reflection mode
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 and reflection
- Femtosecond fluorescence upconversion
- Femtosecond stimulated Raman scattering (FSRS)
- Fluorescence lifetime TCSPC
- Intensity-dependent transient absorption and reflection
- Flash photolysis – nanosecond transient absorption
- Higher repetition rates available; contact sales@lighton.com for details.
- Spectral range is extendable to NIR; contact sales@lighton.com for details.
- High-speed detector available (< 50 ps); contact sales@lighton.com for details.
- Maximum measurement range depends on the phosphorescence signal.
- 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.
- Depends on the objective used.
- Without external spectrograph.
- 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.
Modes
- 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. 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.
Modes
- 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 and reflection.
The pump-pump-probe (PDP), Pump-repump-probe (PrPP) and Pre-pump-pump-probe (pPPP) techniques is a way to manipulate the reactions and access new regions of the higher excited states.
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.
Modes
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
HARPIA-TA supports cryostats that can be mounted externally or internally.
Liquid samples are mixed up to avoid overexposure and ensure fresh sample.
Used to automatically optimize pump and probe overlap.
To lock the optical beam paths for OPA wavelenghts (200 – 1100 nm).
For checking beam shape/size at any position before/after measurement inside HARPIA
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
The HARPIA spectroscopy system achieves an excellent signal‑to‑noise ratio at high repetition rate and low energy excitation conditions. The graphs below compare the signal-to-noise ratio (SNR) of difference absorption spectra obtained with a Ti:Sapphire laser operating at 1 kHz and a PHAROS laser operating at 64 kHz with the same acquisition time.
Pump probe Measurement Data Samples
Kerr Gate Measurement Data Samples
Fluorescence Upconversion Measurement Data Samples
TCSPC Measurement Data Samples
Femtosecond stimulated Raman spectroscopy (FSRS) Measurement Data Samples
Pump-dump-probe Measurement Data Samples
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