A heated viewport provides optical access to the vacuum chamber where the window portion is heated to prevent condensation of growth material. Unlike a standard shutter the heated viewport provides long term optical access where transparency is maintained. This is ideal when combined with in situ optical monitoring tools such as AccuFlux.
Available viewport sizes are 2.75″ (on a 4.5″ flange) and 4.5″ (on a 6″ flange). Maximum internal temperatures of the viewport surface are 500 C for the 2.75″ version and 400 C for the 4.5″ version. Power is supplied via AC current modulated by a temperature controller.
SpecificationsHW275 Heated Viewport | |
| Mounting Flange: | 2.75″/4.5″ CF |
| Weight: | 5 lbs |
| Thermocouple: | Type-K |
| Controller Fuse: | 0.5 A, 120-240 VAC |
| Operation Temperature: | 250°C typical, 500 °C maximum |
| Clear Aperture: | 1.3″ diameter |
| Viewport Material: | UV fused silica, sapphire heated disc |
HW450 Heated Viewport | |
| Mounting Flange: | 4.5″/6.0″ CF |
| Weight: | 10 lbs |
| Thermocouple: | Type-K |
| Controller Fuse: | 1.5 A, 120-240 VAC |
| Operation Temperature: | 250°C typical, 400 °C maximum |
| Clear Aperture: | 2.3″ diameter |
| Viewport Material: | UV fused silica, sapphire heated disc |
Photo of the heated viewport
Temperature versus power curve for heated viewport