A component for a laser tool, the component comprising: a tubular body defining an internal channel and an aperture； and a window disposed across the aperture and bonded to the tubular body around the aperture, wherein the window is diamond, and wherein the tubular body comprises a material having a coefficient of linear thermal expansion &alpha； of 14×10&minus；6 K&minus；1 or less at 20° C. and a thermal conductivity of 60 Wm&minus；1K&minus；1 or more at 20° C.
