The Solid State Raman Shifters LZ series use innovative technology Ba(NO₃)₂ and KGdWO₄ crystals. Unique crystal properties and optimal cavity design allow to obtain Raman frequency conversion with more than 50% efficiency. Unlike gas Raman Shifters using high pressure cells, the LZ221 is characterized by complete safety in operation and low operating densities of pump radiation, what leads to additional advantages and facilitates the operation.