Hoʻopuka nā Passive Q-switch a i ʻole saturable absorbers i nā pulse laser mana kiʻekiʻe me ka ʻole o ka hoʻohana ʻana i nā Q-switch electro-optic, a laila e hōʻemi ana i ka nui o ka pūʻolo a hoʻopau i kahi lako mana uila kiʻekiʻe.ʻO Co2+:MgAl2O4he mea hou no ka passive Q-hoololi i lasers emitting mai 1.2 a hiki i 1.6μm, i ka mea, no ka maka-palekana 1.54μm Er: aniani laser, akā, hana no hoi ma 1.44μm a me 1.34μm laser hawewe.ʻO Spinel kahi aniani paʻa paʻa e poni maikaʻi.