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Schematic of the fSTIRAP device. The dotted lines after the right end of the sample indicate the complete STIRAP process.
Emission spectra under illumination of 633 nm He–Ne laser light (red, solid line), 532 nm Nd:YAG light (green, dashed line), and 476 nm argon ion light (blue, dotted line).
Multicolor fluorescence measurements, showing light transfer in the fSTIRAP device. Upper row: fluorescence images for three wavelengths and merged RGB-image. Lower row: measured intensities of input (l), center (c), and output (r) waveguides, and the incoherent sum of 633 nm, 532 nm, and 476 nm (fourth column).
Spectral response of the fSTIRAP coupler, plotted (a) as the intensity crossection at the output (horizontal axis) for different wavelengths (vertical axis), and (b) as output intensity vs wavelength. For comparison the measured dispersion of a directional coupler is shown in (c).
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