Résumé
We demonstrate broadband (THz) cw operation of a modeless external-cavity quantum-dot semiconductor diode laser. The laser cavity design is based on a frequency-shifted-feedback laser design using an intracavity acousto-optic frequency shifter. The rms intensity fluctuations are < 0.5% and the coherence time is similar or equal to 1 mu s. The spectral optical power density is similar or equal to 0.2 mu W/MHz.