Long distance measurement with a femtosecond laser based frequency comb

Development and optical performance tests of the Si immersed grating demonstrator for E-ELT METIS

<br/>Immersed gratings offer several advantages over conventional gratings: more compact spectrograph designs, and by using standard semiconductor industry techniques, higher diffraction-efficiency and lower stray-light can be achieved. We present the optical tests of the silicon immersed grating demonstrator for the Mid-infrared E-ELT Imager...