In this report, the sampled grating distributed feedback laser architecture is modified with digital concatenated gratings to partially compensate for the wavelength dependence of optical gain in a standard high efficiency quantum cascade laser core. This allows equalization of laser threshold over a wide wavelength range and demonstration of wide electrical tuning. With only two control currents, a full tuning range of 500 nm (236 cm-1) has been demonstrated. Emission is single mode, with a side mode suppression of >20 dB.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)