Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 2: Ultrafast phenomena
HL 2.3: Talk
Monday, March 11, 2013, 10:00–10:15, H2
Towards Terahertz Pulse Shaping — •Jan-Martin Rämer1,2 and Georg von Freymann1,2 — 1Fraunhofer-Institut für Physikalische Messtechnik IPM, 67663 Kaiserslautern, Germany — 2Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
We present a system capable of manipulation of phase and amplitude of pulsed terahertz radiation. A grating stretcher is used to spatially disperse the spectra of frequency doubled laser pulses generated by a 1.56 µ m femtosecond fiber laser. A spatial light modulator is placed within the fourier plane of the grating stretcher, allowing the application of phase changes on spectral components of the femtosecond pulse. Phase masks for shaping of the optical pulses are retrieved using the Gercherg-Saxton algorithm, allowing a fast retrieval time. Light temporally shaped by this setup is focussed onto a LTG-GaAs photoconductive antenna generating terahertz radiation which is measured using a second photoconductive antenna. We demonstrate temporal shifts of terahertz pulses as well as generation of terahertz pulse trains.