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Rapidly Frequency-Swept Optical Beat Source for Continuous Wave Terahertz Generation
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- Authors
- Min Yong Jeon, Namje Kim, Sang-Pil Han, Hyunsung Ko, Han-Cheol Ryu, Dae-Su Yee, Kyung Hyun Park
- Issue Date
- 2011-09
- Citation
- Optics Express, v.19, no.19, pp.18364-18371
- ISSN
- 1094-4087
- Publisher
- Optical Society of America(OSA)
- Language
- English
- Type
- Journal Article
- 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. © 2011 Optical Society of America.
- KSP Keywords
- Continuous-wave terahertz, Distributed feedback (DFB) laser, Fiber-coupled, High Speed, Low temperature(LT), Optical beat source, THz generation, THz measurement, THz radiation, THz signals, Terahertz generation