Journal
OPTICS LETTERS
Volume 43, Issue 19, Pages 4723-4726Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.004723
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Funding
- Horizon 2020 Framework Programme (H2020) under the Marie Sklodowska-Curie grant agreement (MidTECH project) [642661]
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We demonstrate a broadband multilayer anti-reflection (AR) coating applied to a quantum cascade laser (QCL) facet. The bandwidth of the AR coating was optimized for the range of 8.0 to 12.0 mu m to cover the entire emission spectrum of a broad-gain QCL. The laser facets are high-reflectance and AR-coated for use in an external cavity QCL The AR coating is composed of layers of yttrium fluoride, zinc sulfide, and germanium, all deposited using electron-beam evaporation, and the modal reflectance of the laser facet across the wavelength range was reduced to 0.75%. The external cavity laser performance in a Littrow-type configuration is also described. (C) 2018 Optical Society of America
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