Neat work! Question from someone who's familiar with RF atomic clocks but not optical -- how do you steer a laser in frequency? For RF, it all comes down to VCOs: if you want a different tune range or different frequency, you just pick a different VCO.
But for lasers, I thought the frequency was driven by the energy difference between electron states for a given species? How do you synthesize an arbitrary frequency for a laser without something crazy like a FEL?
But for lasers, I thought the frequency was driven by the energy difference between electron states for a given species? How do you synthesize an arbitrary frequency for a laser without something crazy like a FEL?