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Scalable terahertz generation by large-area optical rectification at 80 TW laser power

2019; Optica Publishing Group; Volume: 44; Issue: 22 Linguagem: Inglês

10.1364/ol.44.005634

1539-4794

Dogeun Jang, Chul Kang, Seong Ku Lee, Jae Hee Sung, Chul‐Sik Kee, Seungwoo Kang, Ki‐Yong Kim,

Superconducting and THz Device Technology

We demonstrate high-energy terahertz generation from a large-aperture (75 mm diameter) lithium niobate wafer by using a femtosecond laser with energy up to 2 J. This scheme utilizes optical rectification in a bulk lithium niobate crystal, where most terahertz energy is emitted from a thin layer of the rear surface. Despite its simple setup, this scheme can yield 0.19 mJ of terahertz energy with laser-to-terahertz conversion efficiencies of ~0.01%, about 3 times better than ZnTe when pumped at 800 nm. The experimental setup is up-scalable for multi-mJ terahertz generation with petawatt laser pumping.