Investigation on the origin of terahertz waves generated by dc-biased multimode semiconductor lasers at room temperature
Latkowski, Sylwester and Surre, Frederic and Maldonado-Basilio, Ramón and Landais, Pascal (2008) Investigation on the origin of terahertz waves generated by dc-biased multimode semiconductor lasers at room temperature. Applied Physics Letters, 93 (24). ISSN 0003-6951
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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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