Passive Q-switches lossis saturable absorbers tsim lub zog siab laser pulses yam tsis siv electro-optic Q-switches, yog li txo cov pob loj thiab tshem tawm cov khoom siv hluav taws xob siab.Co2+:MgAl2O4yog ib yam khoom tshiab rau passive Q-hloov nyob rau hauv lasers emitting ntawm 1.2 mus rau 1.6μm, tshwj xeeb tshaj yog, rau qhov muag-kev nyab xeeb 1.54μm Er: iav laser, tab sis kuj ua hauj lwm ntawm 1.44μm thiab 1.34μm laser wavelengths.Spinel yog ib qho nyuaj, ruaj khov siv lead ua uas polishes zoo.