- On Monday with Daniele,
- we did full characterization of amplifier beam @ 10% amplification, adjusted the telescope accordingly and injected into the cavity aligned and improved on the fundamental mode.
- On Tuesday with Daniele and Kevin
- I added a low pass filter between 1 - 1.9 MHz on the reflected signal, to reject the oscillator signal (33.33 MHz)
- removed the external resistors on the signal, only the internal resistance of the oscilloscope used ( transmission : 1 M ohm , Reflection : 50 ohm )
- We connected the motors to control the CEP and adjusted on them until we reached ~ 5 -10% coupling
- Images:
- 1st : showing the size of the beam just before injecting into the cavity @ 10%
- 2nd: signal with only improved alignment (not CEP adjustment yet), no low pass filter added yet
- 3rd : zoom on the signals (reflection and error) while adjusting on the CEP
- 4th :attempting to lock the cavity , after getting the max coupling using the CEP motors
Note : the voltage ranges are not the same between the images
| Manar Amer wrote: |
|
Yesterday,
- we installed the second high power reflecting mirrors at the output of the amplifier.
- We aligned and installed a telescope that has adjustable distance between the 2 lenses of -100 mm, and + 200 mm, with approximate diameter at the injection window of ~ 4.5 mm.
- Amplifier was turned on only at the first stage only (output power ~ 300 mW) aligned and injected into the cavity.
- Measured the repetition frequency of the One Five oscillators, Frep = 33.326239 MHz
- Changed the FSR of the cavity to match it.
- Using the Piezo scan on the oscillator, we observed 00 Mode, Fundamental. the shape is the same
- We see transmission on the diode, but there was zero coupling observed (yet to be investigated experimentally )
- a reason could be the CEP of the oscillator ,
- bad matching of the beam waist position,
- noise from the amplifier (as we were operating it at very low power)
- additional alignment needed,
|
|