LD　pumped　erbium　glass　passively　Q-switched　1.5μm　microchip　laser　is　a　research　hotspot　in　laser　ranging　and　imaging　application.　The　high　repetition　rate　microchip　laser　has　serious　thermal　effect　problem,　so　it　is　difficult　to　work　stably　for　a　long　time.　This　paper　reports　a　passively　Q-switched　1535nm　laser　with　erbium-ytterbium　co-doped　phosphate　glass　using　double-ended　adhesive-free　bonding　technology.　The　laser　combines　YAG　crystal,　Er3+/Yb3+:　glass　and　Co2+[/sup:　MgAl2O4　by　bonding　to　improve　the　thermal　effect　of　the　laser.　At　the　same　time,　by　optimizing　the　size　of　the　pump　light　spot,　the　initial　transmittance　T0　of　the　saturable　absorber　and　the　reflectivity　R　of　the　output　mirror,　the　utilization　efficiency　of　the　pump　light　is　improved　and　the　influence　of　thermal　effect　is　further　reduced.　The　results　show　that　the　laser　output　with　the　repetition　rate　of　1kHz,　the　single　pulse　energy　of　40μJ,　pulse　width　of　8ns,　peak　power　of　5kW,　beam　quality　of　1.4,　can　output　stably　for　a　long　time.　©　2021　SPIE.