Embedded optical probe for gas turbine engine

A gas turbine engine comprising:

• a flow separation wall separating a first flow path from a second flow path;
• and
• an optical probe embedded within the flow separation wall, the optical probe comprising:
• a housing, the housing operatively coupled to the flow separation wall;
• a plurality of optical fibers, a portion of each of the optical fibers secured to fiber holders;
• an optical head disposed within the housing and having channels extending in a longitudinal direction of the optical head, the fiber holders disposed within the channels;
• a cap disposed within the housing and operatively coupled to the optical head, the plurality of optical fibers extending through the cap;
• an inner tube operatively coupled to the cap, the plurality of fibers extending through the inner tube;
• and
• an outer tube surrounding a portion of the inner tube to define an annulus therebetween, that allows for cooling air to be routed therethrough or to purge the interior of the housing, the outer tube operatively coupled to the housing.