| 520-5253 25.4 mm Dia. Magnesium Fluoride Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Magnesium Fluoride | Circular |
| 520-6253 25.4 mm Dia. Magnesium Fluoride Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Magnesium Fluoride | Circular |
| 520-6506 50.8 mm Dia. Magnesium Fluoride Window; t=6 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | Magnesium Fluoride | Circular |
| 530-5253 25.4 mm Dia. UV grade CaF2 Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | CaF2 | Circular |
| 530-6756 70 mm Dia. IR grade CaF2 Window; t=6 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | CaF2 | Circular |
| 510-5506 50.8 mm Dia. UV grade Lithium Fluoride Window; t=6 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | LiF | Circular |
| 540-7445 44.6 mm Dia. Barium Fluoride Window; t=3.5 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | BAF2 | Circular |
| 540-7503 50.8 mm Dia. Barium Fluoride Window; t=3 mm Uncoated | Optics | Window | Flat Window | EKSMA Optics | BAF2 | Circular |
| WGE2501 25 mm Dia. Germanium Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WGE1000 10 mm Dia. Germanium Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WGE2522 25.4 mm Dia. Germanium Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Germanium | Circular |
| WHS2533 25 mm Dia. Sapphire Random Cut Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WHS2700 27 mm Dia. Sapphire Random Cut Round Window; t=2.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WHS2502 25 mm Dia. Sapphire Random Cut Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WSC1001 10 mm Dia. C-Cut Sapphire Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WSC1302 12.5 mm Dia. C-Cut Sapphire Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WSC5002 50 mm Dia. C-Cut Sapphire Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Al2O3 | Circular |
| WBF1301 13 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1605 16 mm Dia. Barium Fluoride Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1616 16 x 16 mm Barium Fluoride Rectangular Window; t=1.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Rectangular |
| WMG2504 25 mm Dia. Magnesium Fluoride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WMG2001 20 mm Dia. Magnesium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WKB2505 25 mm Dia. Potassium Bromide Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WKB5005 50 mm Dia. Potassium Bromide Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WGW2525 25 x 25 mm White Float Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| WBF1500 15 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF3800 38 mm Dia. Barium Fluoride Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1601 16 mm Dia. Barium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1002 10 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF2010 20 x 10 mm Barium Fluoride Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Rectangular |
| WBF2002 20 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WMG2505 25.4 mm Dia. Magnesium Fluoride Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WZN0702 7 mm Dia. Zinc Selenide Standard Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | ZnSe | Circular |
| WKB4000 40 mm Dia. Potassium Bromide Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WKB2542 23 x 41 mm Potassium Bromide Rectangular Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Rectangular |
| WNA2505 25mm Dia. Sodium Chloride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WGW7500 75 mm Dia. White Float Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WBF2505 25.4 mm Dia. Barium Fluoride Round Window; t=0.5mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF2510 25.4 mm Dia. Barium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1603 16 mm Dia. Barium Fluoride Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF3002 30 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WBF1902 19 mm Dia. Barium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WKB2341 23 x 41 mm Potassium Bromide Rectangular Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Rectangular |
| WKB2002 20 mm Dia. Potassium Bromide Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WNA1300 13mm Dia. Sodium Chloride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WNA4000 40mm Dia. Sodium Chloride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WNA1301 13mm Dia. Sodium Chloride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WGW5050 50 x 50 mm White Float Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| WGW5051 50 x 50 mm White Float Rectangular Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| WGW6500 65 mm Dia. White Float Round Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Circular |
| WBF2504 25 mm Dia. Barium Fluoride Round Window; t=4mm Uncoated | Optics | Window | Flat Window | Knight Optical | BAF2 | Circular |
| WMG2500 25 mm Dia. Magnesium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WMG1302 13 mm Dia. Magnesium Fluoride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WKB4505 45 mm Dia. Potassium Bromide Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WNA3005 30mm Dia. Sodium Chloride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WNA5005 50mm Dia. Sodium Chloride Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WGW100100 100 x 100 mm White Float Rectangular Window; t=3mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| HMPQP-40C10-20 40 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| OPFL-15C02-P 15 mm Dia. Float Glass Round Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | Soda Lime | Circular |
| OPSQ-15S03-4-5 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-20S01-P 20 x 20 mm UVFS Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-70S2.3-0.2-10 70 x 70 mm UVFS Square Optical Parallel Flat Window; t=2.3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S01-P 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-40S06-1-5 40 x 40 mm UVFS Square Optical Parallel Flat Window; t=6 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S05-10-5 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-40S04-1-5 40 x 40 mm UVFS Square Optical Parallel Flat Window; t=4 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S05-4-5 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S02-10-5 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S03-10-5 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S02-4-5 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-40S04-P 40 x 40 mm UVFS Square Optical Parallel Flat Window; t=4 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| HMPQP-30C10-12 30 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-30C10-40 30 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-80C15-12 80 mm Dia. UVFS High Precision Round Optical Flat Window; t=15 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| OPFL-30C01-P 30 mm Dia. Float Glass Round Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | Soda Lime | Circular |
| OPSQ-25S03-10-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S03-1-5 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S05-4-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S05-P 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-50S03-P 50 x 50 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S02-P 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S03-4-5 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S05-10-5 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S01-1-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S02-P 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S02-P 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-50S05-10-5 50 x 50 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-50S05-P 50 x 50 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S05-4-5 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-20S05-1-5 20 x 20 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S2.3-1-10 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=2.3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPB-10S01-10-5 10 x 10 mm N-BK7 Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | N-BK7 | Rectangular |
| HMPQP-50C10-6 50 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-60C12-40 60 mm Dia. UVFS High Precision Round Optical Flat Window; t=12 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-150C25-20 150 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=25 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-130C20-12 130 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=20 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| OPSQ-20S05-P 20 x 20 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S02-1-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S01-4-5 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S02-20-2 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |