It was a bit difficult to comprehend the result.
Is it good? or bad? Have you seen the thermal effect? or not?
- Put linear lines to show the visibility of the cavity.
- Calibrate the incident power and make another plot to show the visibility (%) vs the incident power (W).
We wanted to see thermal effects on the PMC.
What I did yesterday:
Changed the current of the NPRO from 2A to 0.8A and measured the power of the reflected/transmitted light from the PMC when locked.
I also measured the power of the reflected light when PMC is not locked (It supposed to be proportional to the output power of the laser).
At several points of the laser current, I could'nt lock the PMC very well. The power of the reflected/transmitted light depend on the offset voltage of the PZT.
When the laser power was weak(~<0.9A), the power of reflected/transmitted light changed periodically(~ several minutes).