A Question about the EOM used for PDH locking

Malamala
Messages
342
Reaction score
28
Hello! I am locking a ~30 kHz linewidth laser to a ~100 kHz linewidth ultrastable (ULE) cavity, aiming to reduce the laser linewidth to ~ 1 kHz using PHD locking. The feedback signal is sent to the laser current (it is an external cavity diode laser). For PDH the modulation of the EOM used to create the sidebands is usually 10-20 MHz, which can be achieved either with a fiber EOM or with a resonant free space EOM (my power is very small - few mW around 700 nm). Is there any advantage to using a fiber vs a free space EOM? Power losses during fiber coupling are not an issue, my question is mainly focused on whether one of these options allows a better lock and hence a lower linewidth.
 
Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...

Similar threads

Replies
2
Views
3K
Replies
6
Views
2K
Replies
2
Views
3K
Replies
9
Views
4K
Replies
6
Views
2K
Back
Top