BIGFOOT (Readout)
ShalikaSingh - 18:07, Friday 10 January 2025 (3873)
Beam requirement for EOM

The aperture of EOM is 2mm diameter. So, the beam radius should be smaller than 1mm.

The power density requirement is <4W/mm2.

The current beam characteristics are shown using lens F=100 in Fig 1 and F=50, -50 mm in Fig 2. from elog 3754

If we keep input power of around 1.5mW, both of the lens system would be fine to implement.

The 100 mm lens was kept at 101.5cm.

Tbh I didn't quite understand why the 100 mm lens was removed (in elog 3563). From the beam characteristics it seems we can achieve the requirement on both power density and beam size using one lens and in less space. I feel its much better to use less lens and keep stuff in compact space, unless there is some reasonable issue that needs to be taken into account. If the space is compact we can fit both EOM in reasonable space, without consuming the entire length of the table.

In Fig 3 I have added position for both EOM and the required lens for it.(will add the plot in a shortwhile)

Images attached to this report
3873_20250110063749_completebeambeforeandafterf100mm.png 3873_20250110063753_completebeambeforeandafter2f50mm.png