If your Siglent does not have enough second harmonic energy, the idea presented to just hang a 1N914 across the output is a good idea except most of the harmonic energy generated will be on the odd harmonics. So if you need a stronger signal just tune your Siglent to 1/3 of 50 mHz which is 16.6666 etc mHz. The third (and 5th, 7th, etc ) harmonics should be plenty strong. You may need to crank your Siglent up a bit to get the desired diode action. In theory this idea should work.
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