Passive Q-ihinduranya cyangwa ibyuma byuzuza ibyara ingufu za laser pulses zidakoresheje amashanyarazi ya opt-optique, bityo bikagabanya ingano yipaki kandi bikuraho amashanyarazi menshi.Co.2+: MgAl2O4ni ibintu bishya ugereranije na pasiporo Q-ihinduranya muri lazeri isohoka kuva kuri 1,2 kugeza kuri 1,6 mm, byumwihariko, kubireba ijisho 1.54 mm Er: ikirahure cyikirahure, ariko kandi ikora kuri 1.44 mm na 1.34μm ya lazeri.Spinel nikintu gikomeye, gihamye kristu isukuye neza.