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We report divergence, astigmatism, and beam propagation factor (M2) measurements of quantum cascade lasers (QCLs) with emission wavelengths of 8.77 mum. Emission profiles from the facet showed full-width at half-maximum divergence angles of 62deg and 32degplusmn2deg for the fast and slow axes, respectively. Diffraction-limited Ge aspheric microlenses were designed and fabricated to efficiently collect,...
We report divergence, astigmatism and M2 measurements for 8.77 mum quantum cascade lasers. Measurements showed divergence of 62deg by 32deg FWHM plusmn 2deg and M2 values of 1.81 and 1.22 for the fast and slow axes respectively. Astigmatism at source was ~4 mum, less than half a wave.
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