[1] Faist J, Capasso F, Sivco D L, et al. Quantum cascade laser[J]. Science, 1994, 264: 553-556.

[2] Mujagic E, Schwarzer C, Yao Y, et al. Two-dimensional broadband distributed-feedback quantum cascade laser arrays[J]. Applied Physics Letters, 2011, 98(14): 141101.

[3] Miriam Serena Vitiello, Giacomo Scalari, Benjamin Williams, et al. Quantum cascade lasers: 20 years of challenges[J]. Optics Express, 2015, 23(4): 5167-5182.

[4] Bloom G, Larat C, Lallier E, et al. Passive coherent beam combining of quantum-cascade lasers with a Dammann grating[J]. Optics Letters, 2012, 36(19): 3810-3812.

[5] Chann B, Huang R K, Missaggia L J, et al. Near-diffraction-limited diode laser arrays by wavelength beam combining[J]. Optics Letters, 30(16): 2104-2106.

[6] Alfredo Bismuto, Stephane Blaser, Romain. High performance, low dissipation quantum cascade lasers across the mid-IR range[J]. Optics Express, 2015, 23(5): 5477-5484.

[7] Andrew Sijan. Development of military lasers for optical countermeasures in the Mid-IR[J]. Proc of SPIE, 2009, 7483: 748304.

[8] Arbabi Amir, Ryan M Briggs, Horie Yu, et al. Efficient dielectric metasurface collimating lenses for mid-infrared quantum cascade lasers[J]. Optics Express, 2015, 23(26): 33310-33317.

[9] YU Nan-fang, Laurent Diehl, Ertugrul Cubukcu, et al. Near-field imaging of quantum cascade laser transverse modes[J]. Optics Express, 2007, 15(20): 13227-13235.