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We investigate near-field lateral mode patterns of quantum cascade wide-ridge lasers using a spatially-resolving spectrometer. The results support box-model theory and, show that lateral mode pattern can be made either degenerate or non-degenerate in frequency.
The fine structure of broad-area laser diode optical spectrum is investigated with ~30 MHz resolution using spatially-resolved self-heterodyning. Demonstrated method is capable of measuring the individual lateral mode intensity and spacing.
We minimize scattering losses and maximize coupling to a given free-space mode from sub-wavelength metal aperture surrounded by periodic corrugations via optimum choice of parameters of the structure.
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