We moved the fork for the dichroic just after the cavity, which reflect infrared in and transmit the green out, to make more space, then we align the cavity again. Now we have the output green power of 45mW. After that we measured the green beam size again, did the calculation, the beam waist and position is more or less the same with the result we had before.
Based on this result and the aperture of the optics, we design the telescope:
Origin set at the first line of holes in front of the cavity.
L1: z=7.5cm f1=100mm
L2ï¼›z=45cm f2=125mm
L3: z=132.5cm f3=1000mm
According to the optical scheme, we estimated the position of the optics and their apertures:
FI: 22.5cm 5mm
EOM:57.5cm 3mm
AOM:90cm 1.5mm
FI: 123.5 5mm
In the simulation, after we put the three lenses for the telescope, we only need to put another two tune lenses for the AOM, two 100mm, one at 82.5cm, the other at 102.5cm. Then everything will be fine.
Another thing we discovered today, it's that the telescope for infrared has been finished for very long time, but with a lens having 350mm focal length which is not available from any company, so we did the design again:
L1: z=48.5cm f1=500mm(Alreday installed)
L2: z=122.5cm f2=150mm
L3: z=154.5cm f3=175cm
We will try to look into the bench if there is enough space for the lens and order them.
Also yesterday we put everything back one by one and send the beam far away to check where exactly the astigmatism come from. Everything was find until we put the Faraday, then after the mirror we put the second lens, when we moved this lens or turned it, the beam can change from elongated in vertical to round then from round to elongated in horizontal. So finally we can be sure that the astigmatism is from this lens. Then we put it in a good position and tried to send it to the end. On the screen, we can see it on the 290m target, although it is large, but it more circular than before, we will check the size of it after we finish the telescope,if it is still large, we can move the 2inch mirror.