Media 3: Real-time absolute frequency measurement of continuous-wave terahertz radiation based on dual terahertz combs of photocarriers with different frequency spacings YasuiTakeshi HayashiKenta IchikawaRyuji CahyadiHarsono HsiehYi-Da MizutaniYasuhiro YamamotoHirotsugu IwataTetsuo InabaHajime MinoshimaKaoru 2015 Originally published in Optics Express on 04 May 2015 (oe-23-9-11367)