The resistance of optical windows and mirrors that are made of polycrystalline CVD diamonds (with a 25-mm diameter and 1.3-mm thickness) with a heat conductivity of 1970 W/mK is studied upon the radiation of the CW ytterbium laser (λ = 1.07 μm and the power is 10 kW). It is determined that the window withstands a power density of 11.7 MW/cm2, and a 25-layer interference mirror on a diamond plate was destroyed (without cooling) at 8.2 MW/cm2. The simulation of the water-cooled window showed that its maximum heating will not exceed 100°C at an incident power of 35 kW. It is shown that unique properties of the CVD diamond allow one to consider this material promising for applications in high-power lasers.
Russian Microelectronics – Springer Journals
Published: Nov 17, 2012
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