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Continuous-wave microcavity quantum cascade lasers in whispering-gallery modes up to 50 °C
Optics Express
|October 13, 2022
Summary
We developed a selective thermal dissipation scheme for microcavity quantum cascade lasers, enabling continuous-wave operation for portable sensing applications. These directional-emission lasers offer improved thermal management and high integration potential.
Area of Science:
- Optoelectronics
- Quantum Cascade Lasers
- Nanophotonics
Background:
- Micro-resonator lasers are ideal for optoelectronic integration due to small size and low thresholds.
- Microcavity quantum cascade lasers (QCLs) face challenges in continuous-wave operation because of high thermal loads.
Purpose of the Study:
- To design a selective thermal dissipation scheme for microcavity QCLs.
- To improve thermal conductivity and enable continuous-wave operation for on-chip sensing.
Main Methods:
- Developed a selective thermal dissipation scheme using electrical isolation.
- Fabricated lasers with a notched elliptical resonator design.
- Characterized laser performance at 50 °C with 4.7-µm emission.
Main Results:
- Achieved continuous-wave operation at 50 °C.
- Demonstrated a highly unidirectional far-field emission profile.
- Obtained an in-plane beam divergence of 1.9°.
Conclusions:
- The developed thermal dissipation scheme enhances the performance of microcavity QCLs.
- Directional-emission QCLs are suitable for portable and highly integrated sensing.
- This work paves the way for advanced on-chip sensing applications.
