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Gerz, Daniel; Schweinberger, Wolfgang; Butler, Thomas Patrick; Siefke, Thomas; Heusinger, Martin; Amotchkina, Tatiana; Pervak, Vladimir; Zeitner, Uwe; Pupeza, Ioachim (2019): Mid-infrared long-pass filter for high-power applications based on grating diffraction. In: Optics Letters, Vol. 44, No. 12: pp. 3014-3017
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A gold-coated silicon grating has been developed, enabling efficient spatial separation of broadband mid-infrared (MIR) beams with wavelengths >5 mu m from collinearly propagating, broadband, high-power light in the near-infrared (NIR) spectral range (centered at 2 mu m). The optic provides spectral filtering at high powers in a thermally robust and chromatic-dispersion-free manner such as that necessary for coherent MIR radiation sources based on parametric frequency down-conversion of femtosecond MR lasers. The suppression of a > 20 W average-power, 2 mu m driving pulse train by three orders of magnitude, while retaining high reflectivity of the broadband MIR beam, is presented. (C) 2019 Optical Society of America