The advent of effective solid-state pulse lasers operating in the 3-pm range [1, 2] that became available during the last ten years sets forth the problem of designing methods of registration and visualization of laser radiation within this range. Today, a researcher may choose from a good number of IR radiation visualization techniques resting upon the effect of a change of properties in various materials under the influence of heat . In terms of such indicators as sensitivity, dynamic range, resolution, as well as a number of operational characteristics, the "thermal sensitization" technique applied to silver-halide photoemulsions  is far superior to any other available technique for visualization of IR radiation pulsed laser fields. This technique has been originally applied to photoregistration of pulsed gas laser radiation in the range of 5 and 10 pm. This paper presents the results of the experimental study of the potential of the method for registration of a YAG:Er3+ laser radiation at λ = 2.94 μm. The following parameters were determined: sensitivity, 2 mJ/cm2; dynamic range, 100; resolution with the generation pulse duration of 200 μs, not worse than 50 lines/mm.