TY - JOUR T1 - The effects of TGG crystal length on output power of end-pumped unidirectional ring vanadate laser TT - اثر طول بلور TGG بر توان خروجی لیزر وانادیت یک طرفه حلقوی دمش از انتها JF - opsi JO - opsi VL - 23 IS - 0 UR - http://opsi.ir/article-1-1283-en.html Y1 - 2017 SP - 625 EP - 628 KW - terbium gallium garnet KW - faraday rotator KW - optical diode KW - thermal lensing KW - unidirectional ring laser N2 - In this article, the effects of TGG crystal length on optimization and operation of unidirectional ring vanadate laser have been considered. For this purpose, with numerical analysis of thermal lensing of TGG crystal and considering it as a thin lens in the resonator, the optimization for different lengths of TGG crystal have been done. We obtained that for Optimum Performance, the longer crystals should have shorter resonator and the obtained optimal pump power should be lower than the shorter crystals. Then, experimental results were compared with theoretical results and they were in a good agreement. Finally, for all three crystals, output power and laser efficiency were about 5.5 W and 20% respectively. M3 ER -