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

Mu-MASS Laser Current status and updates Zak Burkley & Jesse Zhang Mu-MASS Laser update Laboratory for Positron and Positronium Physics | | 12.11.19 1

EOM business ▪ 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 % Mu-MASS Laser update Laboratory for Positron and Positronium Physics | | 12.11.19 2

EOM of Ps cavity ▪ 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 Mu-MASS Laser update Laboratory for Positron and Positronium Physics | | 12.11.19 3