I have generated an octave-spanning supercontinuum (750-1700nm) using 140fs pulses. I want to frequency double longer wavelength (1600nm) using PPLN crystal. Since, I don't know what's the pulse duration/shape, peak power, or energy in that specific bandwidth (around 1600nm), how should I choose SHG crystal (PPLN) for SHG. Specifically, how to determine crystal length and acceptance bandwidth for optimal SHG at 800nm.
Thanks in advance.