Two-Color Fabry-Perot Laser Diode with THz Primary Mode Spacing
S. O'Brien, S. Osborne, K. Buckley, R. Fehse, A. Amann, E. P. O'Reilly, L. P. Barry, P. Anandarajah, J. Patchell, J. O'Gorman
Abstract
A class of multiwavelength Fabry-Perot lasers is introduced where the spectrum is tailored through a non-periodic patterning of the cavity effective index. The cavity geometry is obtained using an inverse scattering approach and can be designed such that the spacing of discrete Fabry-Perot lasing modes is limited only by the bandwidth of the inverted gain medium. A specific two-color semiconductor laser with a mode spacing in the THz regime is designed, and measurements are presented demonstrating the simultaneous oscillation of the two wavelengths. The extension of the Fabry-Perot laser concept described presents significant new possibilities in laser cavity design.
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