| 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 |
| WMG1901 19 mm Dia. Magnesium Fluoride Round Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Magnesium Fluoride | Circular |
| WKB3005 30 mm Dia. Potassium Bromide Round Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WNA2342 23 x 41 mm Sodium Chloride Rectangular Window; t=5mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Rectangular |
| WNA2002 20mm Dia. Sodium Chloride Round Window; t=2mm Uncoated | Optics | Window | Flat Window | Knight Optical | UVFS | Circular |
| WGW100101 100 x 100 mm White Float Rectangular Window; t=1mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| WGB1106 5.8 x 10.8 mm White Float Rectangular Window; t=0.7mm Uncoated | Optics | Window | Flat Window | Knight Optical | Soda Lime | Rectangular |
| HMPQP-150C30-20 150 mm Dia. UVFS High Precision Round Optical Flat Window; t=30 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-80C15-6 80 mm Dia. UVFS High Precision Round Optical Flat Window; t=15 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-150C30-6 150 mm Dia. UVFS High Precision Round Optical Flat Window; t=30 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-40C10-12 40 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-130C25-12 130 mm Dia. UVFS High Precision Round Optical Flat Window; t=25 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-80C15-20 80 mm Dia. UVFS High Precision Round Optical Flat Window; t=15 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-150C25-40 150 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=25 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-100C17-6 100 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=17 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-150C25-12 150 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=25 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| OPFL-25.4C02-P 25.4 mm Dia. Float Glass Round Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | Soda Lime | Circular |
| OPSQ-25S03-1-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S01-10-5 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S05-10-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S05-1-5 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S02-1-5 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-20S03-20-2 20 x 20 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-120S2.3-0.1-10 120 x 120 mm UVFS Square Optical Parallel Flat Window; t=2.3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-40S03-1-5 40 x 40 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-40S06-20-2 40 x 40 mm UVFS Square Optical Parallel Flat Window; t=6 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S01-1-5 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-15S03-P 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S05-1-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S02-P 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S05-P 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| HMPQP-100C20-40 100 mm Dia. UVFS High Precision Round Optical Flat Window; t=20 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-100C20-6 100 mm Dia. UVFS High Precision Round Optical Flat Window; t=20 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-130C25-6 130 mm Dia. UVFS High Precision Round Optical Flat Window; t=25 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-30C10-20 30 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-40C10-40 40 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-50C10-20 50 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-100C20-20 100 mm Dia. UVFS High Precision Round Optical Flat Window; t=20 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| OPFL-25.4C01-P 25.4 mm Dia. Float Glass Round Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | Soda Lime | Circular |
| OPFL-15C03-P 15 mm Dia. Float Glass Round Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | Soda Lime | Circular |
| OPFL-25.4C03-P 25.4 mm Dia. Float Glass Round Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | Soda Lime | Circular |
| OPFL-30C03-P 30 mm Dia. Float Glass Round Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | Soda Lime | Circular |
| OPSQ-15S05-20-2 15 x 15 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-50S03-1-5 50 x 50 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-50S08-20-2 50 x 50 mm UVFS Square Optical Parallel Flat Window; t=8 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-50S08-1-5 50 x 50 mm UVFS Square Optical Parallel Flat Window; t=8 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-10S05-20-2 10 x 10 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S03-P 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S05-20-2 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-80S2.3-0.2-10 80 x 80 mm UVFS Square Optical Parallel Flat Window; t=2.3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S03-4-5 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S05-20-2 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-40S06-P 40 x 40 mm UVFS Square Optical Parallel Flat Window; t=6 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-20S01-1-5 20 x 20 mm UVFS Square Optical Parallel Flat Window; t=1 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S2.3-0.5-10 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=2.3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| HMPQP-40C10-6 40 mm Dia. UVFS High Precision Round Optical Flat Window; t=10 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-60C12-6 60 mm Dia. UVFS High Precision Round Optical Flat Window; t=12 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-60C12-12 60 mm Dia. UVFS High Precision Round Optical Flat Window; t=12 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPQP-150C30-12 150 mm Dia. UVFS High Precision Round Optical Flat Window; t=30 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-130C20-6 130 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=20 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-150C25-6 150 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=25 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| HMPZP-100C17-20 100 mm Dia. Low Expansion Glass (ULE) High Precision Round Optical Flat Window; t=17 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Circular |
| OPSQ-40S06-4-5 40 x 40 mm UVFS Square Optical Parallel Flat Window; t=6 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-50S02-1-5 50 x 50 mm UVFS Square Optical Parallel Flat Window; t=2 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-25S05-P 25 x 25 mm UVFS Square Optical Parallel Flat Window; t=5 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |
| OPSQ-30S03-10-5 30 x 30 mm UVFS Square Optical Parallel Flat Window; t=3 mm Uncoated | Optics | Window | Flat Window | OptoSigma | UVFS | Rectangular |