19 February 2018 Angled facet waveguide quantum cascade laser for external cavity system
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We describe the use of an angled facet to achieve low reflectance of one facet of a quantum cascade laser. A bent waveguide allows one facet to be angled with respect to the waveguide and still use the natural cleavage plane of the crystal. The application of such structures is external-cavity wavelength tunable quantum cascade lasers. The reflectance is studied as a function of angle with an angle of 11.2° reducing the reflectance from 28% to 3.5%. When combined with a dielectric anti-reflection coating, better external-cavity laser performance is possible.
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Yohei Matsuoka, Yohei Matsuoka, Sylvain Mathonnière, Sylvain Mathonnière, Mykhaylo P. Semtsiv, Mykhaylo P. Semtsiv, W. Ted Masselink, W. Ted Masselink, } "Angled facet waveguide quantum cascade laser for external cavity system", Proc. SPIE 10553, Novel In-Plane Semiconductor Lasers XVII, 105531L (19 February 2018); doi: 10.1117/12.2290149; https://doi.org/10.1117/12.2290149


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