Sampled grating, distributed feedback quantum cascade lasers with broad tunability and continuous operation at room temperature

摘要

A dual-section, single-mode quantum cascade laser is demonstrated in continuous wave at room temperature with up to 114nm (50 cm~(-1)) of tuning near a wavelength of 4.8 μm. Power above 100 mW is demonstrated, with a mean side mode suppression ratio of 24 dB. By changing the grating period, 270 nm (120cm~(-1)) of gap-free electrical tuning for a single gain medium has been realized.