[Aritomi, Eleonora P., Matteo]

 

We measured squeezing and anti-squeezing with different green power.

 

Setting

center frequency: 100kHz

RBW: 1kHz

VBW: 30Hz

Sweep time: 2s

Scan of green phase: 2Hz with 1Vpp

 

Attached figure shows measured squeezing and anti-squeezing with different green power and calculated squeezing and anti-squeezing when loss = 30 %, phase noise = 150 mrad.

 

Although measured squeezing level is not precise due to phase noise, for sure squeeze level increased with lower pump power (lower anti squeezing). 

We confirmed that the reason why we don't have squeezing with 49mW green is phase noise , not too much loss.

 

Next step:

- Check the error signal of OPO reflection with new PD

Attached figure shows measured squeezing and anti-squeezing with different green power and   

calculated squeezing and anti-squeezing when loss = 30%, phase noise = 300mrad.