In this paper, a vertical pin-modulator is described, which replaces the standard backside mirror of the external cavity in a Littman-type laser system. By controlling the reflectivity of the pin-modulator the power of the output beam can be modulated. A pin-modulator with a reflectance contrast of about 4dB leads to a contrast of more than 22dB of the output power in the laser system. By using an array of vertical pin-modulators in the dispersive external arm of the resonator, whose pixels are matched to the individual wavelength, fast wavelength tuning and multi color operation will be possible.
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