fig6 there is shown the laminate device of fig5 after being exposed to gamma rays f centers such as 30 31 32 33 and so on are present essentially fig6 shows f centers located at all areas that were exposed to radiation also shown in fig6 are light beams such as 40 41 42 and 43 these light beams for example are light of the absorption wavelength of the lower ionic crystal if the light beams 40 41 and 43 are at absorption wavelengths of those of the lower ionic crystal then the lower ionic crystal based on the f centers in that layer will emit light as shown by reference numeral 50 thus light 40 which emanates and strikes layer 21 causes layer 21 to lase and emit light 50 at the emission wavelength of layer 21 due to the f center it is seen that light 41 which is of the same frequency as light 40 does not cause layer 24 to lase because of the different absorption frequency fig7 depicts a same device a s shown in fig6 except that the light 60 60 m and 60 r depicted in fig7 is of the absorption wavelength of the top crystal layer 24 also shown in fig7 only the top crystal layer emits light as for example rays 61 and 62 when light 60 impinges thereon light rays such as 60 r and 60 l which is the same frequency as.