Optical facet coatings for high-performance LWIR quantum cascade lasers at λ ～ 8.5 μm
We report on the performance improvement of long-wave infrared quantum cascade lasers(LWIR QCLs)by studying and optimizing the anti-reflection(AR)optical facet coating.Compared to the Al2O3 AR coat-ing,the Y2O3 AR coating exhibits higher catastrophic optical mirror damage(COMD)level,and the optical facet coatings of both material systems have no beam steering effect.A 3-mm-long,9.5-μm-wide buried-heterostruc-ture(BH)LWIR QCL of λ～8.5 μm with Y2O3 metallic high-reflection(HR)and AR of～0.2%reflectivity coating demonstrates a maximum pulsed peak power of 2.19 W at 298 K,which is 149%higher than that of the uncoated device.For continuous-wave(CW)operation,by optimizing the reflectivity of the Y2O3 AR coating,the maximum output power reaches 0.73 W,which is 91%higher than that of the uncoated device.
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