Figure 1 | Scientific Reports

Figure 1

From: High-efficiency near-infrared optical parametric amplifier for intense, narrowband THz pulses tunable in the 4 to 19 THz region

Figure 1

Experimental setup for generating narrowband, strong THz fields, composed of two high-efficiency OPAs. A laser pulse with 2.8 mJ is separated to pump two identical two-stage OPAs seeded by the same white light generation (WLG) system, and to probe for electro-optic sampling (EOS). Each separated beam is down-collimated by a Galilean telescope. The signal output from each OPA is chirped by a pair of high-efficiency transmission gratings and utilized for the DFG process in a DSTMS crystal. The generated THz pulses are extracted by a pair of low pass filters (LPF) and characterized by either interferometric autocorrelation or EOS in a GaP crystal. The EOS setup consists of a half-wave plate (HWP), a Wollaston prism (WP), and two fast photodiodes in a balanced detecting configuration.

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