Mu-MASS Laser Current status and updates Zak Burkley & Jesse - - PowerPoint PPT Presentation

| | Mu-MASS Laser update

Current status and updates

Zak Burkley & Jesse Zhang

12.11.19 1

Mu-MASS Laser

Laboratory for Positron and Positronium Physics

| | Mu-MASS Laser update

▪Qubig EOM with bigger aperture (5mm x 5mm instead of 3mm x 3mm) arrived on Friday ▪Still observe thermal lensing at high powers ▪Lensing effect (beam focuses after ~30 cm) power dependent ▪Need to re mode-match after changing power ▪Input to cavity (with mm lenses): ~60 % ▪Input to cavity w/o EOM (no mm lenses): 75 %

12.11.19 Laboratory for Positron and Positronium Physics 2

EOM business

| | Mu-MASS Laser update

▪ Used QIOptiq EOM: No thermal lensing at high powers, i.e. mode matching not power dependent ▪ Input to cavity (no mm lenses): 70 % ▪ Could handle 5W at 488nm, with 5 MHz modulation ▪ Current EOM has 17.86 MHz modulation ▪ New electronics (new coil for LC circuit) in planning/construction

12.11.19 Laboratory for Positron and Positronium Physics 3

EOM of Ps cavity