An index-guided tapered quantum cascade laser emitting near 9.5 μm with sloped sidewalls and no anti-reflection coating is presented, and the performance for devices with taper half-angles of 1° and 2° is investigated. The 1° device delivers up to 2.5 W of peak optical power at room temperature with beam quality-factor M2 = 2.08, while the two-degree device outputs 3.8 W with M2 = 2.25 for a maximum brightness of 1.87 MW cm−2 sr−1.
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Gökden et al. (2013) studied this question.
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