Fig. 1. Setup for irradiation: 1: UV lamp, 2: protective sleeve, 3: exposed flat sample, and 4: plate holder.

Fig. 2. Pictures of Ag0.95Tl0.05Br0.95I0.05: (a) before and after exposure to the UV lamp, (b) 500-fold magnified border between exposed and unexposed parts, and (c) 1000-fold magnification of the exposed area.

Fig. 3. Relative transmission variation depending on the exposure time for Ag0.98Tl0.02Br0.98I0.02.

Fig. 4. Optical losses versus UV exposure time of the AgCl-AgBr and AgBr-TlI plates at three different wavelengths.

Fig. 5. Relative change of transmission intensity in terms of optical losses as a function of the specific compositions of the AgCl-AgBr and AgBr-TlI solid solutions.