| WZN2525 25 x 25 mm Zinc Selenide Standard Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Rectangular |
| WZN2010 10 x 20 mm Zinc Selenide Standard Rectangular Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Rectangular |
| WZN5003 50 mm Dia. Zinc Selenide Standard Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN4203 42 mm Dia. Zinc Selenide Standard Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN3520 35 mm Dia. Zinc Selenide Standard Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN3040 30 mm Dia. Zinc Selenide Standard Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN2505 25 mm Dia. Zinc Selenide Standard Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN2544 25 mm Dia. Zinc Sulphide FLIR Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnS | Circular |
| WZN2522 25 mm Dia. Zinc Sulphide FLIR Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnS | Circular |
| WZN2503 25 mm Dia. Zinc Sulphide Multispectral (clear) Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnS | Circular |
| WZN2502 25 mm Dia. Zinc Sulphide Multispectral (clear) Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnS | Circular |
| WZN2201 22 mm Dia. Zinc Selenide Standard Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN1911 19 mm Dia. Zinc Sulphide Multispectral (clear) Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnS | Circular |
| WZN1503 15 mm Dia. Zinc Selenide Standard Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN1512 15 mm Dia. Zinc Sulphide Multispectral (clear) Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnS | Circular |
| WZN1004 10 mm Dia. Zinc Selenide Standard Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN1002 10 mm Dia. Zinc Selenide Standard Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN1001 10 mm Dia. Zinc Selenide Standard Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN1005 10 mm Dia. Zinc Selenide Standard Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WZN9502 9.5 mm Dia. Zinc Sulphide FLIR Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnS | Circular |
| WHQ1500 15 mm Dia. Quartz Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WHQ2500 25 mm Dia. Quartz Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WHQ4000 40 mm Dia. Quartz Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WHF2500 25 mm Dia. UVFS Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WHF2511 25 mm Dia. UVFS Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WHF4000 40 mm Dia. UVFS Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WHF5000 50 mm Dia. UVFS Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WHF5051 50 x 50 mm UVFS Rectangular Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Rectangular |
| WQF3500 35 mm Dia. Quartz Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQF2500 25 mm Dia. Quartz Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WSI2500 25.4 mm Dia. Silicon Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WSI3203 32 mm Dia. Silicon Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WSI1501 15 mm Dia. Silicon Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WSI2505 25.4 mm Dia. Silicon Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WSI1201 12 mm Dia. Silicon Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WSI2504 25.4 mm Dia. Silicon Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WSI1301 13 mm Dia. Silicon Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WSI3012 30 mm Dia. Silicon Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Silicon | Circular |
| WQZ1002 10 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ1302 13 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ2001 20 mm Dia. Z-Cut Quartz Right Handed Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ2002 20 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ2501 25 mm Dia. Z-Cut Quartz Right Handed Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ2502 25 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ2526 25 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2.6mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ2601 26 mm Dia. Z-Cut Quartz Right Handed Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ3515 35 mm Dia. Z-Cut Quartz Right Handed Round Window; t=1.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ35002 35 mm Dia. Z-Cut Quartz Left Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ3502 35 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ40002 40 mm Dia. Z-Cut Quartz Left Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ4202 42 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ50002 50 mm Dia. Z-Cut Quartz Left Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ50005 50 mm Dia. Z-Cut Quartz Left Handed Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ6002 60 mm Dia. Z-Cut Quartz Right Handed Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| WQZ8003 80 mm Dia. Z-Cut Quartz Right Handed Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Quartz | Circular |
| 45-635 5 mm Dia. B270 Glass Protective Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 32-947 10 mm Dia. B270 Glass Protective Flat Window; t=1 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 45-638 15 mm Dia. B270 Glass Protective Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 32-949 15 mm Dia. B270 Glass Protective Flat Window; t=2 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 32-951 25 mm Dia. B270 Glass Protective Flat Window; t=2 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 45-641 30 mm Dia. B270 Glass Protective Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 45-255 35 mm Dia. B270 Glass Protective Flat Window; t=2 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 45-643 40 mm Dia. B270 Glass Protective Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 45-572 50 mm Dia. B270 Glass Protective Flat Window; t=3 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 48-419 75 mm Dia. B270 Glass Protective Flat Window; t=3 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Circular |
| 64-088 5.0 x 5.0 mm B270 Glass Protective Flat Window; t=1 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Rectangular |
| 64-089 10.0 x 10.0 mm B270 Glass Protective Flat Window; t=1 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Rectangular |
| 64-090 15.0 x 15.0 mm B270 Glass Protective Flat Window; t=2 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Rectangular |
| 64-091 20.0 x 20.0 mm B270 Glass Protective Flat Window; t=2 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Rectangular |
| 48-413 50.0 x 50.0 mm B270 Glass Protective Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | Edmund Optics | B270 | Rectangular |
| 48-418 50.0 x 50.0 mm B270 Glass Protective Flat Window; t=3 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Rectangular |
| 48-420 75.0 x 75.0 mm B270 Glass Protective Flat Window; t=3 mm MgF2 400-700nm | Optics | Window | Flat Window | Edmund Optics | B270 | Rectangular |
| 68-812 13 mm Dia. Sodium Chloride Protective Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | Edmund Optics | UVFS | Circular |
| WGT1000-AI2 10 mm Dia. B270 Glass Round Window; t=1mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Circular |
| WGT1003-AI2 10 mm Dia. B270 Glass Round Window; t=3mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Circular |
| WGT2500-AI2 25 mm Dia. B270 Glass Round Window; t=1mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Circular |
| WGT2504-AI2 25 mm Dia. B270 Glass Round Window; t=4mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Circular |
| WGT2523-AI2 25 x 25 mm B270 Glass Rectangular Window; t=3mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Rectangular |
| WGT2524-AI2 25 x 25 mm B270 Glass Rectangular Window; t=4mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Rectangular |
| WGT5050-AI2 50 x 50 mm B270 Glass Rectangular Window; t=1mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Rectangular |
| WGT5053-AI2 50 x 50 mm B270 Glass Rectangular Window; t=3mm AR 1050-1700nm | Optics | Window | Flat Window | Knight Optical | B270 | Rectangular |
| WGE10011 100 mm Dia. Germanium Round Window; t=10mm AR-DLC 7-14µm | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WG70530-D 0.5in Dia. AR Coated; ZnSe Broadband Precision Window; t=3 mm 1650-3000nm | Optics | Window | Flat Window | Thorlabs | ZnSe | Circular |
| WG70530-E4 0.5in Dia. AR Coated; ZnSe Broadband Precision Window; t=3 mm 2-13µm | Optics | Window | Flat Window | Thorlabs | ZnSe | Circular |
| WG71050-E4 1in Dia. AR Coated; ZnSe Broadband Precision Window; t=5 mm 2-13µm | Optics | Window | Flat Window | Thorlabs | ZnSe | Circular |
| WG70530-E2 0.5in Dia. AR Coated; ZnSe Broadband Precision Window; t=3 mm 4.5-7.5µm | Optics | Window | Flat Window | Thorlabs | ZnSe | Circular |
| WG71050-G 1in Dia. AR Coated; ZnSe Broadband Precision Window; t=5 mm 7-12µm | Optics | Window | Flat Window | Thorlabs | ZnSe | Circular |
| WG80530 0.5in Dia. Silicon Broadband Precision Window; t=3 mm Uncoated | Optics | Window | Flat Window | Thorlabs | Silicon | Circular |
| WG81050 1in Dia. Silicon Broadband Precision Window; t=5 mm Uncoated | Optics | Window | Flat Window | Thorlabs | Silicon | Circular |
| WG90530 0.5in Dia. Germanium Broadband Precision Window; t=3 mm Uncoated | Optics | Window | Flat Window | Thorlabs | Germanium | Circular |
| WG90530-G 0.5in Dia. AR Coated; Germanium Broadband Precision Window; t=3 mm 7-12µm | Optics | Window | Flat Window | Thorlabs | Germanium | Circular |
| WG91050-G 1in Dia. AR Coated; Germanium Broadband Precision Window; t=5 mm 7-12µm | Optics | Window | Flat Window | Thorlabs | Germanium | Circular |
| W-BKP008 50 mm Dia. N-BK7 Precision Flat Window; t=4mm Uncoated | Optics | Window | Flat Window | Ross Optical | N-BK7 | Circular |
| W-BKS004 12.5 mm Dia. N-BK7 Standard Flat Window; t=3mm Uncoated | Optics | Window | Flat Window | Ross Optical | N-BK7 | Circular |
| W-SIS020 25 mm Dia. Silicon Infrared Flat Window; t=1mm Uncoated | Optics | Window | Flat Window | Ross Optical | Silicon | Circular |
| W-BKS003 10 mm Dia. N-BK7 Standard Flat Window; t=1mm Uncoated | Optics | Window | Flat Window | Ross Optical | N-BK7 | Circular |
| W-FSP004 25 mm Dia. UVFS Precision Flat Window; t=6mm Uncoated | Optics | Window | Flat Window | Ross Optical | UVFS | Circular |
| W-FSP006 50 mm Dia. UVFS Precision Flat Window; t=10mm Uncoated | Optics | Window | Flat Window | Ross Optical | UVFS | Circular |
| W-SAP014 20 mm Dia. Sapphire Flat Window; t=2mm Uncoated | Optics | Window | Flat Window | Ross Optical | Al2O3 | Circular |
| W-CFS010 10 mm Dia. CaF2 Infrared Flat Window; t=1mm Uncoated | Optics | Window | Flat Window | Ross Optical | CaF2 | Circular |