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

Daniel Gerz, Wolfgang Schweinberger, Thomas Patrick Butler, Thomas Siefke, Martin Heusinger, Tatiana Amotchkina, Vladimir Pervak, Uwe Zeitner, and Ioachim Pupeza

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Abstract

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.

© 2019 Optical Society of America

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