Abstract

A terahertz excitation source based on a dual-lateral-mode distributed Bragg reflector (DBR) laser working in the 1.5 μm range is experimentally demonstrated. By optimizing the width of the ridge waveguide, the fundamental and the first-order lateral modes are obtained from the laser. The mode spacing between the two modes is 9.68 nm, corresponding to a beat signal of 1.21 THz. By tuning the bias currents of the phase and DBR sections, the wavelengths of the two modes can be tuned by 2 nm, with a small strength difference (<5 dB) and a large side-mode suppression ratio (SMSR>45 dB).

© 2015 Chinese Laser Press

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