| WBF2000 20 mm Dia. Barium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1300 13 mm Dia. Barium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF2550 25.4 mm Dia. Barium Fluoride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1001 10 mm Dia. Barium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| 220-0403M 40.0 mm Dia. N-BK7 Precision Round Window; t=10 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 220-0106M 12.5 mm Dia. N-BK7 Precision Round Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 220-0466M 40.0 mm Dia. N-BK7 Precision Round Window; t=6 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 220-0726E 76.2 mm Dia. N-BK7 Precision Round Window; t=12.7 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 520-5506 50.8 mm Dia. Magnesium Fluoride Window; t=6 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Magnesium Fluoride | Circular |
| 530-5385 38.1 mm Dia. UV grade CaF2 Window; t=5 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | CaF2 | Circular |
| 550-7252 25.4 mm Dia. Sapphire Window; t=2 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Al2O3 | Circular |
| WQK2501 25.4 mm Dia. N-BK7 Precision Round Window; t=6.35mm Uncoated | Optics | Window | Flat Window | Knight Optical | N-BK7 | Circular |
| WQK4000 40 mm Dia. N-BK7 Precision Round Window; t=6mm Uncoated | Optics | Window | Flat Window | Knight Optical | N-BK7 | Circular |
| WQK2511 25 mm Dia. N-BK7 Precision Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | N-BK7 | Circular |
| WGP1600 16 mm Dia. Schott Borofloat 33 Round Window; t=1.1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Borofloat33 | Circular |
| WGE2500 25 mm Dia. Germanium Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WGE2985 8.5 x 29.5 mm Germanium Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Rectangular |
| WHS0505 5 x 5 mm Sapphire Random Cut Rectangular Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Rectangular |
| WHS2000 20 mm Dia. Sapphire Random Cut Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WHS8615 86.25 mm Dia. Sapphire Random Cut Round Window; t=15mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WHS8511 86 mm Dia. Sapphire Random Cut Round Window; t=10mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WHS0516 16 mm Dia. Sapphire Random Cut Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WSC2503 25 mm Dia. C-Cut Sapphire Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WBF4000 40 mm Dia. Barium Fluoride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| 220-0166M 12.5 mm Dia. N-BK7 Precision Round Window; t=6 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 220-0406E 38.1 mm Dia. N-BK7 Precision Round Window; t=8 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 520-5385 38.1 mm Dia. Magnesium Fluoride Window; t=5 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Magnesium Fluoride | Circular |
| 510-5253 25.4 mm Dia. UV grade Lithium Fluoride Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | LiF | Circular |
| 510-5384 38.1 mm Dia. UV grade Lithium Fluoride Window; t=4 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | LiF | Circular |
| 550-7121 12.7 mm Dia. Sapphire Window; t=1 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Al2O3 | Circular |
| 550-7126 12.7 mm Dia. Sapphire Window; t=6 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Al2O3 | Circular |
| 550-7382 38.1 mm Dia. Sapphire Window; t=2 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Al2O3 | Circular |
| 580-6034 38.1 mm Dia. Germanium Window; t=4.0 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Germanium | Circular |
| WQK4025 25 x 40 mm N-BK7 Precision Rectangular Window; t=6mm Uncoated | Optics | Window | Flat Window | Knight Optical | N-BK7 | Rectangular |
| WQK5000 50 mm Dia. N-BK7 Precision Round Window; t=6mm Uncoated | Optics | Window | Flat Window | Knight Optical | N-BK7 | Circular |
| WQK6540 40 x 65 mm N-BK7 Precision Rectangular Window; t=8mm Uncoated | Optics | Window | Flat Window | Knight Optical | N-BK7 | Rectangular |
| WGE3005 30 mm Dia. Germanium Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WGE2425 24 mm Dia. Germanium Round Window; t=2.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WHS1001 10 mm Dia. Sapphire Random Cut Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WHS10001 100 mm Dia. Sapphire Random Cut Round Window; t=6mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| 220-0293E 25.4 mm Dia. N-BK7 Precision Round Window; t=10 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 220-0236M 25.0 mm Dia. N-BK7 Precision Round Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 220-0786E 76.2 mm Dia. N-BK7 Precision Round Window; t=8 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | N-BK7 | Circular |
| 530-6251 25.4 mm Dia. UV grade CaF2 Window; t=1 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | CaF2 | Circular |
| 530-6252 25.4 mm Dia. UV grade CaF2 Window; t=2 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | CaF2 | Circular |
| 530-6253 25.4 mm Dia. IR grade CaF2 Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | CaF2 | Circular |
| 540-7251 25.4 mm Dia. Barium Fluoride Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | BAF2 | Circular |
| 550-7254 25.4 mm Dia. Sapphire Window; t=4 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Al2O3 | Circular |
| 550-7503 50.0 mm Dia. Sapphire Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Al2O3 | Circular |
| 580-6023 25.4 mm Dia. Germanium Window; t=3.0 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Germanium | Circular |
| WQK2515 15 x 25 mm N-BK7 Precision Rectangular Window; t=6mm Uncoated | Optics | Window | Flat Window | Knight Optical | N-BK7 | Rectangular |
| WGP1000 10 mm Dia. Schott Borofloat 33 Round Window; t=1.1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Borofloat33 | Circular |
| WGP4000 40 mm Dia. Schott Borofloat 33 Round Window; t=1.1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Borofloat33 | Circular |
| WHP1600 16 mm Dia. Schott Borofloat 33 Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Borofloat33 | Circular |
| WHP5000 50 mm Dia. Schott Borofloat 33 Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Borofloat33 | Circular |
| WGP2540 25 x 40 mm Schott Borofloat 33 Rectangular Window; t=1.1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Borofloat33 | Rectangular |
| WGE1601 16 mm Dia. Germanium Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WGE2505 25 mm Dia. Germanium Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WHS1501 15 mm Dia. Sapphire Random Cut Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WHS2500 25 mm Dia. Sapphire Random Cut Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WSC2501 25 mm Dia. C-Cut Sapphire Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WBF3505 35 mm Dia. Barium Fluoride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF7503 75 mm Dia. Barium Fluoride Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF3001 30 mm Dia. Barium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WMG3200 32 mm Dia. Magnesium Fluoride Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WMG2002 20 mm Dia. Magnesium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WMG1501 15 mm Dia. Magnesium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WZN4124 23 x 41 mm Zinc Selenide Standard Rectangular Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Rectangular |
| WKR2500 25 mm Dia. Potassium Bromide Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WNA2341 23 x 41 mm Sodium Chloride Rectangular Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Rectangular |
| WGW1000 10 mm Dia. White Float Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WGW10000 100 mm Dia. White Float Round Window; t=6mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WGW2500 25 mm Dia. White Float Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WGW2515 15 x 25 mm White Float Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| WGW5000 50 mm Dia. White Float Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WBF2501 25 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF6305 63 mm Dia. Barium Fluoride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1202 12 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF2540 25.4 mm Dia. Barium Fluoride Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WZN4123 23 x 41 mm Zinc Selenide Standard Rectangular Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Rectangular |
| WZN0705 7 mm Dia. Zinc Selenide Standard Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WKR1300 13 mm Dia. Potassium Bromide Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WKB2500 25 mm Dia. Potassium Bromide Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WGW1600 16 mm Dia. White Float Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WGW4011 40 mm Dia. White Float Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WGW4025 25 x 40 mm White Float Rectangular Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| WGW3011 30 x 30 mm White Float Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| WBF1305 13 mm Dia. Barium Fluoride Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF5003 50 mm Dia. Barium Fluoride Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF2205 22 mm Dia. Barium Fluoride Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF2512 25 x 12 mm Barium Fluoride Rectangular Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Rectangular |
| WMG2502 25 mm Dia. Magnesium Fluoride Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WMG2501 25 mm Dia. Magnesium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WMG1301 13 mm Dia. Magnesium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WNA5105 50.8mm Dia. Sodium Chloride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WGW2511 25 mm Dia. White Float Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WGW4000 40 mm Dia. White Float Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WBF2203 25 mm Dia. Barium Fluoride Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WMG2503 25 mm Dia. Magnesium Fluoride Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WMG2515 25 mm Dia. Magnesium Fluoride Round Window; t=1.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |