Hai-Wei Du, Hiromichi Hoshina, Chiko Otani
RIKEN Ctr. for Advanced Photonics (Japan)
Proc. SPIE 9671, AOPC 2015: Advances in Laser Technology and Applications, 96710M (October 15, 2015); doi:10.1117/12.2199229
In this study, we investigate THz pulses generated from optical rectification with tilted-pulse-front pumping scheme in which the laser beam is focused to a line in a stoichiometric lithium niobate (sLN) crystal. A cylindrical lens and a common lens are used to focus the pump laser beam to a line. The power law of THz pulse generation and the redshift induced from the sLN crystal are measured. The spectral shapes of the laser pulse are changed by inserting a filter into the pump laser beam, causing the THz radiation to change. The filter is a metal wire with 2 mm diameter. Experimental results show that this method can change the generated THz time waveforms but not their spectra. Such method offers a simple means to change and manipulate THz field generated from optical rectification with tiled-pulse-front pumping scheme.
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