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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 automation options providing pump and probe beam position tracking and alignment, pump polarization control, supercontinuum generator switching, sample positioning, as well as switching between transient absorption and transient reflection measurements. Broadbａnd probe options cover a 330 – 16000 nm range, while a monochromatic probe can be used up to 24 μm. The probe delay stage is configurable from 2 ns to 8 ns.
HARPIA-TA features market-leading sensitivity of 0.05 mOD (10-4 ΔT/T) and can be operated at high repetition rates of up to 1 MHz when used with a PHAROS or CARBIDE laser and an ORPHEUS series OPA, which allows the study of transient absorption dynamics with excitation pulse energies down to several nanojoules.
HARPIA-TA is compatible with cryostats and peristaltic pumps, and the capabilities of the spectrometer are extendable using expansion modules.
| Model | HARPIA-TA | |||
| Configuration | UV / VIS / NIR / SWIR | MIR | ||
| Probe excitation wavelength | 1030 nm | 515 nm | 800 nm | n/a 1) |
| Probe spectral range | 460 – 1600 nm | 350 – 750 nm | 330 – 1400 nm | 190 nm – 16000 nm 2) |
| Detection spectral range | 200 – 1100 nm, 900 – 1700 nm, or 900 – 2600 nm | 2 – 13 μm 3) | ||
| Delay range | 2 ns, 4 ns, or 8 ns | |||
| Delay resolution | 2.1 fs, 4.2 fs, or 8.3 fs | |||
| Laser repetition rate | 1 – 1000 kHz | |||
| Temporal resolution | < 1.4× pump or probe pulse duration, whichever is longer | |||
| Maximum data acquisition rate | 4000 spectra/s | – | ||
| SNR 4) | 250:01:00 | |||
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