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LAMMP Seminar Video
Widely tunable dual wavelength laser for continuous-wave
Min Yong Jeon, PhD

We report a widely tunable dual-wavelength Erbium-doped fiber laser that uses two micro-heater-integrated Fabry-Perot laser diodes (FP-LDs) and two fiber Bragg gratings (FBGs) for tunable continuous-wave (CW) terahertz (THz) radiation. Each wavelength can be independently tuned by using an FP-LD and an FBG. The wavelength fine tuning is achieved by simultaneously applying current to the micro-heater on the FPLD and strain to the FBG. The side-mode suppression ratio is more than 35 dB for both wavelengths. The wavelength spacing of the dual wavelength can be continuously tuned from 3.2 nm to 9.6 nm. Continuous frequency tuning of the CW THz radiation is also successfully achieved using an InGaAs-based photomixer with our dual-wavelength fiber laser as the optical beat source. The emitted CW THz radiation is continuously tuned from 0.3 to 0.8 THz. And also, we propose a high-speed frequency-scanning optical beat source for continuous THz wave generation by using a spectrum limited wavelength swept laser and a tunable laser. The sweeping range of the wavelength swept laser is over 17.3 nm which corresponds to 2.16 THz of the beat frequency. The achieved side mode suppression ratio of the swept laser is more than 45 dB. And we measure the autocorrelation of the static optical beat frequencies.

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