An exemplary embodiment provides a camera probe having an elongated housing provided with an external wall made of heat-resistant material enclosing an internal space. The housing has a forward opening covered by a window of heat-resistant radiation-transparent material and a position within the internal space for mounting a camera positioned to receive radiation from the window. At least one cooling channel is provided within or adjacent to the external wall, at least over a part of the external wall exposed to elevated temperatures during use of the probe. At least one gas exit port is provided adjacent the window and is oriented to cause gas leaving the gas exit port to sweep over an external surface of the window to keep it cool and free of debris.