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Entry   Laser FP operation, posted by Daniele Nutarelli at Optical room about lasers and optics IMG_20230922_105006_resized_20230922_111612040.jpg
This morning FP Laser was operating well locked at 30 KWatts in stable vay.

There are some fluctuations due tu pointing instabilities probably dues to temperature fluctuations in de bunker.

In the attacced picture are reported the lock parameters and signals.
    Reply   lock oscillateur 33MHz - synthé 500MHz, posted by Ronic Chiche at Optical room about detectors and electronics 
This morning with Daniele, we changed the laser/RF locking scheme :

1) we use the laser 33MHz internal photodiode to do some beating with the 33MHz RF generator (A Rigol generator locked on the 500MHz Ring oscillator).
this beating is only for monitoring purpose, in order to manually adjust the laser frequency at the beginning of a run.
Entry   Characterizing Focus Tunable Lens, posted by Fatematuj Johora at Optical room about lasers and optics Updates_of_Focus_Tunable_lenses.pdf
Yesterday Ronic and I worked on the high laser power measurements with the Vertical set-up of the Focus Tunable Lens. We went upto 38W@4 dpt at the begining
and then also changed the focal power at 38W.

Observation:
Entry   elliptic mode shape, posted by Ronic Chiche at Optical room about lasers and optics Image__2026-07-15__15-28-39.jpeg
the mode shape @ 5-15kW is very elliptic (50% of ellipticity : large size = 2x small size).

we only changed M1 and did not move M2,M3,M4.

what are the possible reasons for the ellipticity:
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