1. Measurements from Viktor Mechanics from Richard Model from Fabian
4 mirror cavity tests
Measurements from Viktor
Mechanics from Richard
Model from Fabian
S shape mode in strong focused regime

2. 1’’ mirror setup

4. Geometry for calculationsP2 S1 P1 S2 70
500
8,05°
9,6°
12,5°
11,9°
15,2°
Angle entre le plan S1, S2, P1  et le plan horizontal = °

5. Waist in cavity : 65µm ; 72µm Orientation of ellipse intensity
Beam radii
300mm 2’’ lens
Cavity mirror
~good qualitative description of data
(cavity not locked …)

6. CCD aperture too small…
Same but for more focused geometry
CCD aperture too small…
Paraxial limitation ?
Waist in cavity :
50µm ; 65µm

7. 2’’ mirror setup
Now, we use a metrology YAG cw laser beam
Does the S shape of the modes comes from mirror edges diffraction ?
Answer : no (No picture because Viktor is ill since 5 days …)
Effect of the ATF beam pipe 5mm slit
Non paraxial model is a challenge  investigation with E. Cormier

8. Tests of the effects of the 5mm beam pipe slit
 To do next