Abstract
This disclosure relates to semiconductor quantum cascade lasers (QCLs). A three-terminal QCL device is disclosed. The three-terminal QCL device includes a unipolar multi-period quantum cascade laser structure embedded in a bipolar structure having three terminals providing at least two independently controllable biases to the QCL device for adjusting the lasing intensity and for tuning the lasing wavelength of the QCL device. The three-terminal QCL device further includes a quantum impedance matching structure for achieving high efficiency carrier injection and lowering lasing threshold. In addition, the multi-period quantum cascade laser structure is selectively doped to provide near charge neutrality during operation. The three-terminal QCL may further be controlled to achieve simultaneous dual- or multi-color lasing.
| Original language | English (US) |
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| U.S. patent number | 11038318 |
| State | Published - Jun 15 2021 |