Use the German
The Reich did more with IR than most, so a google using the German language works pretty well.
For example, do an image search of IR scheinwerfer panther, without quotes, to get some great photos.
The first functional prototype of an Ir solution was presented to members of the Heereswaffenamt in 1939, mounted on a 3,7cm PaK 36 anti-tank gun.
It was neglected, at the time, because the staff imposed the absurd requirement that the equipment should only be developed/deployed if it could offer the same hit probability as firing in broad daylight!
In Fall, 1942, an evolution on that equipment was mounted on a 7,5cm PaK 40, with better results - and a lower bar was set in terms of hit capability. It was only then that work began in earnest towards deploying these systems.
You may want to search the designations and nicknames of other IR equipment developed and deployed by the Wehrmacht, including:
Zielgerat 1128, 1221, and 1222
Fahrgerat 1250, 1252, and 1253
Beobachtunsgerat 1251
The technical term for the IR spotlights will be "Infrarot-Scheinwerfer", followed by a numerical expression of the diameter of the searchlight in question.
Informal names for the IR equipment will inlclude:
Uhu (Owl)
Sperber (sparrow-hawk)
Bildwandler (Biwa, for short)
This all stemmed from the introduction of the Braunsche Rohre - cathode ray tube - by the German firm of AEG in 1934.
All of this information is from the book Panther, by Thomas Anderson and Vincent Wai.
They point to handy sources including a lenghty article in the March 1957 issue of the magazine Der Deutsche Soldat.
Actual accounts of the IR equipment in combat use come from eyewitnesses, and are preserved in that article, the photography of Mr. Franz Schmidt, and the book Der Krieg in der Heimat, detailing IR use in combat around the town of Uelzen in the closing months of the war.