Abstract
For any semiconductor lasers, the wall plug efficiency, that is, the portion of the injected electrical energy that can be converted into output optical energy, is one of the most important figures of merit. A device with a higher wall plug efficiency has a lower power demand and prolonged device lifetime due to its reduced self-heating. Since its invention, the power performance of the quantum cascade laser1 has improved tremendously2,3,4,5,6,7. However, although the internal quantum efficiency7,8 can be engineered to be greater than 80% at low temperatures, the wall plug efficiency of a quantum cascade laser has never been demonstrated above 50% at any temperature. The best wall plug efficiency reported to date is 36% at 120 K (ref. 9). Here, we overcome the limiting factors using a single-well injector design and demonstrate 53% wall plug efficiency at 40 K with an emitting wavelength of 5 µm. In other words, we demonstrate a quantum cascade laser that produces more light than heat.
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References
Faist, J. et al. Quantum cascade laser. Science 264, 553–556 (1994).
Gmachl, C., Capasso, F., Sivco, D. L. & Cho, A. Y. Recent progress in quantum cascade lasers and applications. Rep. Prog. Phys. 64, 1533–1601 (2001).
Evans, A., Yu, J. S., Slivken, S. & Razeghi, M. Continuous-wave operation of λ ≈ 4.8 µm quantum-cascade lasers at room temperature. Appl. Phys. Lett. 85, 2166–2168 (2004).
Bai, Y. et al. Room temperature continuous wave operation of quantum cascade lasers with watt-level optical power. Appl. Phys. Lett. 92, 101105 (2008).
Lyakh, A. et al. 1.6 W high wall plug efficiency, continuous-wave room temperature quantum cascade laser emitting at 4.6 µm. Appl. Phys. Lett. 92, 111110 (2008).
Bai, Y., Slivken, S., Darvish, S. R. & Razeghi, M. Room temperature continuous wave operation of quantum cascade lasers with 12.5% wall plug efficiency. Appl. Phys. Lett. 93, 021103 (2008).
Razeghi, M. High performance InP based mid-IR quantum cascade lasers. IEEE J. Sel. Top. Quantum Electron. 15, 941–951 (2009).
Faist, J. Wallplug efficiency of quantum cascade lasers: critical parameters and fundamental limits. Appl. Phys. Lett. 90, 253512 (2007).
Razeghi, M. et al. High power quantum cascade lasers. New J. Phys. 11, 125017 (2009).
Wanke, M. C. et al. Injectorless quantum-cascade lasers. Appl. Phys. Lett. 78, 3950–3952 (2001).
Katz, S., Vizbaras, A., Boehm, G. & Amann, M. C. High-performance injectorless quantum cascade lasers emitting below 6 µm. Appl. Phys. Lett. 94, 151106 (2009).
Dey, D., Wu, W., Memis, O. G. & Mohseni, H. Injectorless quantum cascade laser with low voltage defect and improved thermal performance grown by metal–organic chemical–vapor deposition. Appl. Phys. Lett. 94, 081109 (2009).
Escarra, M. D. et al. Quantum cascade lasers with voltage defect of less than one longitudinal optical phonon energy. Appl. Phys. Lett. 94, 251114 (2009).
Sirtori, C. et al. Resonant tunneling in quantum cascade lasers. IEEE J. Quantum Electron. 34, 1722–1729 (1998).
Vurgaftman, I., Meyer, J. R. & Ram-Mohan, L. R. Band parameters for III–V compound semiconductors and their alloys. J. Appl. Phys. 89, 5815–5875 (2001).
Evans, A. et al. Buried heterostructure quantum cascade lasers with high continuous-wave wall plug efficiency. Appl. Phys. Lett. 91, 071101 (2007).
Acknowledgements
The authors would like to acknowledge the support, interest and encouragement of R. Leheny, H. Temkin and M. Rosker from the Defense Advanced Research Projects Agency, M. E. Gross from the Office of Naval Research, and experts from the Naval Research Laboratory and the Army Research Office.
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Y.B. designed the laser core structure, fabricated the device, performed the testing and wrote the paper. S.S. designed the waveguide structure, grew the wafer with GS-MBE and wrote the paper. S.K. carried out buried ridge regrowth with MOCVD and S.R.D. conducted the regrowth processing. M.R. provided the idea and supervised the project.
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Bai, Y., Slivken, S., Kuboya, S. et al. Quantum cascade lasers that emit more light than heat. Nature Photon 4, 99–102 (2010). https://doi.org/10.1038/nphoton.2009.263
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DOI: https://doi.org/10.1038/nphoton.2009.263
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