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. 2018 Feb 23;7:17180. doi: 10.1038/lsa.2017.180

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Self-compression and MIR generation setup. (a) Self-compression stage, providing driving pulses for MIR generation. The pulses from the oscillator are coupled into a commercial silica-core photonic-crystal fiber by an aspherical lens with a focal length of 8 mm. The fiber is 2.3 cm long with a core diameter of 12 μm (ESM-12, NKT). The output from the fiber is collimated using a gold 90° off-axis parabolic (OAP) mirror with an effective focal length (EFL) of 25 mm. A half-wave plate (HWP) is placed in front of the coupling lens to change the polarization of the driving pulses. (b) MIR generation setup. The driving pulses are subsequently focused into the GaSe crystal by another gold 90° OAP mirror with an EFL of 20 mm. The generated MIR radiation propagates collinearly with the driving beam transmitted through the crystal. Both beams are collimated by another gold OAP mirror with an EFL of 33 mm and separated by a long-pass filter. The MIR beam is then sent to the monochromator for spectral characterization (see Methods).