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Mid-infrared long-pass filter for high-power applications based on grating diffraction

: Gerz, D.; Schweinberger, W.; Butler, T.P.; Siefke, T.; Heusinger, M.; Amotchkina, T.; Pervak, V.; Zeitner, U.; Pupeza, I.


Optics Letters 44 (2019), Nr.12, S.3014-3017
ISSN: 0146-9592
Fraunhofer IOF ()

A gold-coated silicon grating has been developed, enabling efficient spatial separation of broadband mid-infrared (MIR) beams with wavelengths >5  μm from collinearly propagating, broadband, high-power light in the near-infrared (NIR) spectral range (centered at 2 μm). 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 downconversion of femtosecond NIR lasers. The suppression of a >20  W average-power, 2 μm driving pulse train by three orders of magnitude, while retaining high reflectivity of the broadband MIR beam, is presented.