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Height profile of the employed mixed-order gratings, which consist of two first-order sections providing feedback and a second-order region for vertical outcoupling.
Chemical structure of F8DP and a SEM picture of a mixed-order grating with 18 periods in the second-order region.
Laser spectra for three different film thicknesses on a mixed-order grating with periods (solid lines). For comparison, the ASE spectrum is also shown (dashed curve).
Threshold energy of mixed-order grating lasers for different numbers of periods in the second-order region. Inset: Input-output characteristics of a mixed-order laser with periods. The laser threshold energy is .
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