Abstract
We report results from a highly versatile and scalable raster-scanned continuous wave CO2 laser heater incorporating a dual wavelength photodiode-based temperature monitoring system with feedback control. The system is able to uniformly heat substrates inside a vacuum chamber, reduce the occurrence of substrate fracture and allow almost negligible heat loss to the deposition chamber and surroundings. The minimum achievable temperature difference across the substrate is, in practice, limited by the fastest achievable raster scan speed.
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