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Photoluminescence from GaAs(100). The solid curve is the spectrum obtained with a single Gaussian shaped pulse. The blue squares and red circles show the spectra obtained with a train of three pulses spaced by and , respectively. The two intense peaks correspond to a spin-orbit split pair of transitions of neutral Ga, namely at 403.3 nm and at 417.2 nm. The inset shows the signal at a wavelength of 450.8 nm as a function of the spacing between the pulses (reproduced from Ref. 10).
Transmitted signal vs. polarizer angle. The panels correspond to different emission wavelengths, as indicated. The points labeled “peak” (black squares), “dip” (red circles), and “single” (blue triangles) refer to laser pulses with spacing of , half-integer ( in panel (a) and in panels (b)–(e)), and a single Gaussian pulse, respectively. The laser is p-polarized in panels (a)–(d) and polarized at p+ in panel (e). Error bars are twice the standard error for 15 measurements per point.
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