An optical filter, comprising: a first mirror (552-1, 742-1, 762-1, 782-1), and a second mirror (552-2, 742-2, 762-2, 782-2), each of the first mirror and the second mirror including three or more quarterwave stacks, a first quarterwave stack, of the three or more quarterwave stacks, including a set of alternating paired layers (558-1, 558-2, 748-1, 748-2, 766-1, 766-2, 786-1, 786-2, 786-3, 786-4) of a first material and a second material, the first material having a higher refractive index than the second material, a second quarterwave stack, of the three or more quarterwave stacks, including a set of alternating paired layers (556-1, 556-2, 556-3, 556-4, 746-1, 746-2, 746-3, 746-4, 768-1, 768-2, 768-3, 768-4, 788-1, 788-2, 788-3, 788-4) of a third material and a fourth material, the third material having a higher refractive index than the fourth material, the first material, the second material, the third material, and the fourth material comprising three or more different materials; a spacer (554, 744, 764, 784) disposed between the first mirror and the second mirror; and the first and second mirrors including an unpaired lower refractive index layer (550-1, 550-2, 750-1, 750-2, 770-1, 770-2, 790-1, 790-2), wherein the unpaired lower refractive index layer is not paired with a higher refractive index layer, and wherein each and every quarterwave stack is disposed between the unpaired lower refractive index layers. a first mirror (552-1, 742-1, 762-1, 782-1), and a second mirror (552-2, 742-2, 762-2, 782-2), each of the first mirror and the second mirror including three or more quarterwave stacks, a first quarterwave stack, of the three or more quarterwave stacks, including a set of alternating paired layers (558-1, 558-2, 748-1, 748-2, 766-1, 766-2, 786-1, 786-2, 786-3, 786-4) of a first material and a second material, the first material having a higher refractive index than the second material, a second quarterwave stack, of the three or more quarterwave stacks, including a set of alternating paired layers (556-1, 556-2, 556-3, 556-4, 746-1, 746-2, 746-3, 746-4, 768-1, 768-2, 768-3, 768-4, 788-1, 788-2, 788-3, 788-4) of a third material and a fourth material, the third material having a higher refractive index than the fourth material, the first material, the second material, the third material, and the fourth material comprising three or more different materials; each of the first mirror and the second mirror including three or more quarterwave stacks, a first quarterwave stack, of the three or more quarterwave stacks, including a set of alternating paired layers (558-1, 558-2, 748-1, 748-2, 766-1, 766-2, 786-1, 786-2, 786-3, 786-4) of a first material and a second material, the first material having a higher refractive index than the second material, a second quarterwave stack, of the three or more quarterwave stacks, including a set of alternating paired layers (556-1, 556-2, 556-3, 556-4, 746-1, 746-2, 746-3, 746-4, 768-1, 768-2, 768-3, 768-4, 788-1, 788-2, 788-3, 788-4) of a third material and a fourth material, the third material having a higher refractive index than the fourth material, the first material, the second material, the third material, and the fourth material comprising three or more different materials; a spacer (554, 744, 764, 784) disposed between the first mirror and the second mirror; and the first and second mirrors including an unpaired lower refractive index layer (550-1, 550-2, 750-1, 750-2, 770-1, 770-2, 790-1, 790-2), wherein the unpaired lower refractive index layer is not paired with a higher refractive index layer, and wherein each and every quarterwave stack is disposed between the unpaired lower refractive index layers.