- Set laser to central wavelength, 970 nm
- Manually adjust pockels to about so beam is just bright enough on card to see
- Check beam is still passing through irises of PPC in bypass mode
- Adjust angle of prism such that beam passes through center of exit iris
- Direct beam into bottom of table periscope, through an iris on the table and the iris on the bottom of the periscope
- Adjust the angle of the mirror at the bottom of the periscope such that the beam comes out of the tube straight. (Could align bottom mirror with test laser to ensure it is in the middle of its travel range). Want to make sure the mirror is not so far off that it the beam is hitting the edge of the tube and you are looking at a dim reflection.
- Do rough alignment of all the gantry periscope mirrors so that the beam remains centered on all of them until the beam hits the first mirror of the entrance periscope.
- Add the quarter waveplates before the gantry periscope on the table, and add the entrance quarter waveplate on the vertical breadboard. Set it 45° to the fast axis to make the polarization circular going into the gantry periscope.
- Mount camera alignment system onto remote focus objective holder. Align beam to pass through two irises on remote focus alignment jig using two translation stages on beam periscope.
- Move gantry system back and forth in y and adjust top mirror on periscope gantry such that the beam remains stationary on the camera.
- Move gantry system back and forth in x and adjust first mirror inside box (high up) such that the beam remains stationary on the camera.
- For rotation need to control four degrees of freedom, so have to move camera between two locations (near) and (far), second one is where quarter waveplate goes (near camera). Have to keep beam centered on both. First keep centered on near camera using far mirror, the one that comes next after one used for x, (high up and closer to vertical breadboard). Then keep centered on far one using mirror at bottom of gantry to keep centered on far one.
Multistage periscope alignment
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