Efficient THz generation by tilted-pulse-front pumping in lithium niobate for the split-ring-resonator experiment at FLUTE

We develop a compact, longitudinal diagnostics for fs-scale electron bunches using a THz electric-field transient in a split-ring resonator (SRR) for streaking at the Ferninfrarot Linac- Und Test- Experiment (FLUTE). For this new streaking technique, intensive THz pulses are required, which will be generated by laser-based optical rectification. We present a setup for generating THz pulses using tilted-pulse-front pumping in lithium niobate at room temperature. Excited by an 800-nm Ti:Sa pump laser with 35-fs bandwidth-limited pulse length, conversion efficiencies up to 0.03% were achieved. Furthermore, the current status of the SRR experiment is shown.