If the laser frequency drops, it will move further away from resonance and the error signal will decrease.
2.
Due to photodiode noise, the laser frequency can be swept across the transition and the photodiode reading averaged over many sweeps.
3.
Starting with a laser frequency well below the resonant frequency, photons from any one laser pass right through the majority of atoms.
4.
This means that if the laser frequency increases ( e . g . due to thermal drift ) it will come closer to resonance with the cavity.
5.
We need to measure the phase of the reflected beam, as this will tell us whether our laser frequency is higher or lower than the the cavities.
6.
Using megawatt powered free electron or solid state lasers in combination with adaptive mirrors approximately wide and a photovoltaic array on the climber tuned to the laser frequency for efficiency.
7.
Furthermore, nonlinearity of the oscillating cloud would produce both spatial and temporal harmonics, so nuclear transitions of higher multipolarity could also be driven at multiples of the laser frequency.
8.
Thus, as the laser frequency is swept across the resonance, a small dip in the absorption feature will be observed at each atomic transition ( generally hyperfine resonances ).
9.
An ideal locking signal would be 1 when the laser frequency is too low ( and thus would drive the frequency higher until it reached resonance ) and-1 when laser frequency is too high.
10.
An ideal locking signal would be 1 when the laser frequency is too low ( and thus would drive the frequency higher until it reached resonance ) and-1 when laser frequency is too high.
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