Crystals of group RE:MPb2X5 ( M=K, Rb X= Cl, Br) is a new promising active media for lasers, operating on different wavelengths in the range from UV to mid-IR, including those for TV amplifiers with diode pumping. Interest to this material, which has high RE segregation coefficients and a set of attractive properties increased considerably to date, while:
    • Low energy of phonons in halogenides provides mainly radiative transitions between adjacent levels with the gap = 1500 cm-1 as a result emission bands cover the wide spectral region from UV (transitions from upper excited levels) to 9-10 µm in the mid-IR (transitions within both excited and ground RE multiplets);
    • Complex of long decay times for lower states, high values of absorption cross-sections and low rates of the nonradiative multiphonon relaxation makes these crystals promising for their application as active media for UV/VIS lasers with up-conversion pumping;
    • Broad variations of RE type and dopant concentrations are possible for RE:MPb2X5 crystals;
    • Relatively broad, structureless luminescence bands in RE:MPb2X5 crystals allow fine tuning of the stimulated emission frequency;
    • To date stimulated emission has been obtained for 1.064 µm (Nd), 1.3 and 2.4 µm (Dy) and 4.6 µm (Er);
    • It is important that intense absorption bands match the laser diodes emission for many RE ions in MPb2X5 crystals.
Protective/antireflection coatings may be performed on the aperture surfaces of the produced elements. Typical sizes of optical elements are 4 x 4 x (5-15) mm3.
     Rubidium Iodide (RbI)
     Rubidium Chloride (RbCl)
     Rubidium Bromide (RbBr)

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