Media 1: Widely and continuously tunable terahertz synthesizer traceable to a microwave frequency standard YasuiTakeshi TakahashiHisanari KawamotoKohji IwamotoYutaka AraiKaoru ArakiTsutomu InabaHajime MinoshimaKaoru 2011 Originally published in Optics Express on 28 February 2011 (oe-19-5-4428)