title: Rapidly frequency-swept optical beat source for continuous wave terahertz generation.
abstract: We propose a rapidly frequency-swept optical beat source for continuous wave (CW) THz generation using a wavelength swept laser and a fixed distributed feedback (DFB) laser. The range of the sweeping bandwidth is about 17.3 nm (2.16 THz), 1541.42-1558.72 nm. The achieved side mode suppression ratio for both wavelengths within the full sweeping range is more than 45 dB. We observe CW THz signals for tunable optical beat sources using a fiber coupled CW THz measurement system to confirm the feasibility of using our frequency swept optical beat source as a CW THz radiation source. The THz output signal falls to the thermal noise level of the low-temperature grown (LTG) InGaAs photomixer beyond 1.0 THz. The rapidly frequency-swept optical beat source will be useful for generating high-speed tunable CW THz radiation.
authors.affiliation: Department of Physics, Chungnam National University, Daejeon, South Korea. myjeon@cnu.ac.kr
authors.forename: Min Yong
authors.initials: MY
authors.lastname: Jeon
authors.forename: Namje
authors.initials: N
authors.lastname: Kim
authors.forename: Sang-Pil
authors.initials: SP
authors.lastname: Han
authors.forename: Hyunsung
authors.initials: H
authors.lastname: Ko
authors.forename: Han-Cheol
authors.initials: HC
authors.lastname: Ryu
authors.forename: Dae-Su
authors.initials: DS
authors.lastname: Yee
authors.forename: Kyung Hyun
authors.initials: KH
authors.lastname: Park