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Photon diagnostics at the FLASH THz beamline

Pan, R.; Zapolnova, E.; Golz, T.; Krmpot, A. J.; Rabasovic, M. D.; Petrovic, J.; Asgekar, V.; Faatz, B.; Tavella, F.; Perucchi, A.; Kovalev, S.; Green, B.; Geloni, G.; Tanikawa, T.; Yurkov, M.; Schneidmiller, E.; Gensch, M.; Stojanovic, N.


The THz beamline at FLASH, DESY, provides both tunable (1–300 THz) narrow-bandwidth (∼10%) and broad-bandwidth intense (up to 150 uJ) THz pulses delivered in 1 MHz bursts and naturally synchronized with free-electron laser X-ray pulses. Combination of these pulses, along with the auxiliary NIR and VIS ultrashort lasers, supports a plethora of dynamic investigations in physics, material science and biology. The unique features of the FLASH THz pulses and the accelerator source, however, bring along a set of challenges in the diagnostics of their key parameters: pulse energy, spectral, temporal and spatial profiles. Here, these challenges are discussed and the pulse diagnostic tools developed at FLASH are presented. In particular, a radiometric power measurement is presented that enables the derivation of the average pulse energy within a pulse burst across the spectral range, jitter-corrected electro-optical sampling for the full spectro-temporal pulse characterization, spatial beam profiling along the beam transport line and at the sample, and a lamellar grating based Fourier transform infrared spectrometer for the on-line assessment of the average THz pulse spectra. Corresponding measurement results provide a comprehensive insight into the THz beamline capabilities.

Keywords: Electro-optic; FLASH; FTIR; Intense THz; THz diagnostic

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