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Rectified diode response of a multimode quantum cascade laser integrated terahertz transceiver
Gregory C Dyer1, Christopher D Norquist, Michael J Cich
1Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185, USA.
Optics Express
|March 14, 2013
Summary
We studied the direct current (DC) transport response of a diode within a terahertz quantum cascade laser (THz QCL). Our findings show the internal laser field directly couples to the integrated diode, influencing its response.
Area of Science:
- Physics
- Electrical Engineering
- Quantum Electronics
Background:
- Terahertz quantum cascade lasers (THz QCLs) are crucial for various applications.
- Understanding the interplay between internal laser fields and embedded components is essential for device optimization.
Purpose of the Study:
- To characterize the DC transport response of an integrated diode within a THz QCL.
- To elucidate the coupling mechanisms between the THz QCL's internal field and the diode.
Main Methods:
- Investigated the diode's DC transport response by varying the THz QCL current.
- Analyzed the diode's response in relation to single-mode and multi-mode laser operations.
Main Results:
- The diode's response is a combination of field rectification and thermally activated transport.
- Observed distinct jumps in diode response during mode transitions, independent of output power changes.
- Demonstrated a direct coupling between the internal THz QCL field and the integrated diode.
Conclusions:
- The internal laser field directly interacts with the embedded diode.
- The diode-laser field coupling is sensitive to the spatial distribution of internal fields within the THz QCL.
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