THz Research Benefits from Coherent Femtosecond Amplifier Power

In the laboratory of Professor Rupert Huber at the University of Regensburg, a Coherent ultrafast amplifier model Legend Elite Duo is used to produce CEPstabilized THz pulses. These pulses are used to probe the behavior of electrons in GaSe samples under the influence of transient THz fields approaching 100 MV/cm. By electro-optical “stroboscopic” gating of the resultant signal with a 8 fs pulse in a GaSe detector, the data yields important information about Bloch oscillations as well as coherent and interfering conductive mechanisms only revealed at these high fields and short time intervals [1]. This information can be used in the nascent field of coherent electronics and potential coherent THz-rate electronic computing. As a side benefit, the signal radiated from the sample will be shown to take the form of an extended “ladder” of high order harmonics uniquely covering from <0.1 THz in the far-infrared to 675 THz in the ultraviolet, all locked with complete phase stability, for use in photonic experiments. The high field amplitude and highharmonic CEP-stable generation are enabled by the pulse energy and stability of the Legend Elite amplifier.