I want to generate second harmonic of 1600nm component from the octave-spanning supercontinuum to beat it with 800nm component and detect CEO signal. What are important specs on deciding an optimal SHG crystal.
Also, What should be the crystal acceptance bandwidth or how to estimate it.
Thanks
I would recommend using a periodically poled crystal here, e.g., PPLN or MgO:PPLN. You can probably use a standard crystal for your 1600 nm wavelength. A few nanometers conversion bandwidth are sufficient for f-2f interferometry. In the end, it only matters how many 800 nm photons you generate. A longer PPLN crystal has a narrower acceptance bandwidth but a higher conversion efficiency. In my opinion, the crystal length is therefore not so important. We always used 1 cm long crystals in our Ti:sapphire based experiments.
To convert 800 nm to 1600 nm, you need an upconversion crystal, not SHG!
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