Investigation on the origin of terahertz waves generated by dc-biased multimode semiconductor lasers at room temperature

Latkowski, Sylwester; Surre, Frederic; Maldonado-Basilio, Ramon; Landais, Pascal
December 2008
Applied Physics Letters;12/15/2008, Vol. 93 Issue 24, p241110
Academic Journal
A technique to measure a terahertz wave generated by spectrum tailored Fabry–Pérot lasers (FP) is assessed. A dc-biased and 25 °C temperature controlled FP is probed by a continuous wave signal, tuned at 20 nm away from its lasing modes. With a 0.02 nm resolution optical spectrum analyzer (OSA), the terahertz generated signal frequency is measured from the interval between the probe and its side-band modulations. The terahertz waves emitted by these FPs are measured at 370±5 GHz and at 1.157±0.005 THz, respectively, within a precision set by our OSA. The origin of the terahertz wave is due to passive mode-locked through intracavity four-wave-mixing processes.


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