The TELBE facility is comprised of two superradiant THz sources which provide high-power coherent terahertz radiation between 0.1 and 2.5 THz at high repetition rates up to 250 kHz. The primary THz source at TELBE is based on fully coherent superradiant emission from an 8 period undulator. The resulting emission is carrier envelop phase (CEP) stable with a ~20% spectral bandwidth. With a pulse energy of up to 10 µJ/pulse, the ultrashort transform-limited THz pulses are utilized for driving and probing ultrafast high-field THz-induced dynamics. The other superradiant THz source of TELBE is a synchronized coherent diffraction radiator (CDR), which generates broadband single-cycle pulses. The single-cycle CDR pulses are utilized in conjunction with the multi-cycle undulator radiation to achieve sub-10 fs temporal resolution of coherent THz-driven phenomena.
The TELBE Lab is operated by the High-field THz-driven Phenomena group, with a specific interest in understanding how matter can be controlled and/or manipulated in the electronic ground state by the transient electric and magnetic fields of intense (THz) photon pulses. The low quantum energy of ultra-short pulses in the THz regime opens up the fascinating opportunity to excite low energy degrees of freedom in matter selectively and, if done in the right way, in its electronic ground state. The TELBE Lab is equipped with a wide range of endstations and synchronized tabletop sources for probing ultrafast terahertz-induced dynamics in various states of matter with highest precision.