Fig. 3 Wall-plug efficiency comparison between single emitter against 3-unit ICL array.
active region and low heat interference between each emitter in our array structure design.
Conclusion: We have demonstrated watt-level ICL arrays operating at 10℃ in CW operation. The CW output power from a single 16 µm-wide and 3-mm-long ridge emitter reached 320 mW at 20℃. For an array sample containing three emitters, the maximum WPE of 14.4% was achieved at 10℃, which is close to the value of 15% measured from a single emitter sample, indicating that the array structure design effectively suppressed thermal interference between the emitters.
Acknowledgments: This work was supported by the National Key Research and Development Program of China (2018YFB2200500), the National Natural Science Foundation of China (61790583, 61991431, 62174158), the Youth Innovation Promotion Association of the Chinese Academy of Sciences (2021107), and Key Program of the Chinese Academy of Sciences (XDB43000000). The authors would like to thank Ping Liang for her help in device processing.
 2021 The Authors. Electronics Letters published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
References
  1. Faist, J., Capasso, F., Sivco, D. L., et al.: ‘Quantum cascade laser’, Science , 1994,264 , pp. 533–556
  2. Yang, R.Q.: ‘Infrared laser based on intersubband transitions in quantum wells’, Superlatt. Microstruct. , 1995, 17 , pp. 77–83
  3. Lyakh, A., Maulini, R., Tsekoun, A. et al.: ‘3 W continuous-wave room temperature single-facet emission from quantum cascade lasers based on nonresonant extraction design approach’, Appl. Phys. Lett. , 2009, 95 , p. 141113.
  4. Bai, Y., Slivken, S., Darvish, S. R., et al.: ‘Room temperature continuous wave operation of quantum cascade lasers with 12.5% wall plug efficiency’, Appl. Phys. Lett. , 2008, 93(2): p. 021103.
  5. Maulini, R., Lyakh, A., Tsekoun, A., et al.: ‘High average power uncooled mid-wave infrared quantum cascade lasers’, Electron. Lett. , 2011, 47, pp. 395-397
  6. Bai, Y., Bandyopadhyay, N., Tsao, S. et al.: ‘Room temperature quantum cascade lasers with 27% wall plug efficiency’, Appl. Phys. Lett. , 2011, 98 , p. 181102.
  7. Wang, F., Slivken, S., Wu, D. H., et al.: ‘Room temperature quantum cascade lasers with 22% wall plug efficiency in continuous-wave operation’, Opt. Express , 2020, 28 (12), pp. 17532-17538.
  8. Meyer, J., Bewley, W. W., Canedy, C. L., et al.: ‘The interband cascade laser’, Photonics , 2020, 7 (3), p. 75
  9. Zhou, C., Vurgaftman, I., Canedy, C. L., et al.: ‘Thermal conductivity tensors of the cladding and active layers of antimonide infrared lasers and detectors’, Opt. Mater. Express , 2013,3 (10), pp1632-1640
  10. Canedy, C. L., Abell, J., Merritt, C. D., et al.: ‘Pulsed and CW performance of 7-stage interband cascade lasers’, Opt. Express , 2014, 22 (7): p. 7702-7710.
  11. Kim, M., Bewley, W. W., Canedy, C. L., et al.:’ High-power continuous-wave interband cascade lasers with 10 active stages’,Opt. Express , 2015, 23 (8), pp. 9664-9672.
  12. Li, H., Towe, T., Chyr, I., et al.: ‘Near 1 kW of continuous-wave power from a single high-efficiency diode-laser bar. IEEE Photon. Technol. Lett. , 2007, 19 (13), pp. 960-962.
  13. Shterengas, L., Belenky, G. L., Gourevitch, A., et al.: ‘High-power 2.3-μm GaSb-based linear laser array’, IEEE Photon. Technol. Lett., 2004, 16 (10), pp. 2218-2220.
  14. Vurgaftman, I., Bewley, W. W., Canedy, C. L., et al.: ‘Rebalancing of internally generated carriers for mid-infrared interband cascade lasers with very low power consumption’, Nat. Commun., 2011,2 , p. 585.