Abstract
A wide wavelength tuning of an external cavity quantum-cascade laser (QCL) based on the anticrossed dual-upper-state to multiple-lower-state design is demonstrated in continuous wave (cw) operation at room temperature. The tuning ranges of 321 cm-1 (Δλ/λ∼22%) in pulsed operation and 248 cm-1 (Δλ/λ∼17%) in cw operation are achieved, despite employment of the active region with translational symmetry. The present tuning range in cw operation substantially exceeds the values obtained with the QCLs based on conventional broadband active region designs. In addition, the continuous, single mode tuning is realized with its widely homogeneous gain spectrum.
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