Hello, I'm working on a design idea and have run into a problem. Despite multiple google searches from different angles, I can't seem to find what I'm looking for. Question 1: What is the highest frequency of alternating current ever produced here on earth? (if you know the voltage, that's cool too) Question 2: How was this produced? I'm sure it was solid state, but the highest frequency multiplier I could find available had an input frequency of 40 GHz, and could multiply 3X/ (120 GHz output). Question 3: Is there a theoretical limit to this frequency? Maybe the highest a fiber optic cable can hold? Is there a better material? Thank you... I have more related questions, but I'd probably better start with these.