1.
Opt Lett
; 44(12): 3014-3017, 2019 Jun 15.
Artigo
em Inglês
| MEDLINE
| ID: mdl-31199369
RESUMO
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.