TY - JOUR T1 - Investigation of thermal distribution effects on the efficiency of the second harmonic generation by continuous fiber laser at 1064 nm in the crystals of MgO: PPSLT and MgO: PPLN TT - بررسی اثر توزیع حرارتی بر روی بازده تولید هارمونیک دوم توسط لیزر پیوسته فیبری ۱۰۶۴ نانومتر در کریستال های MgO:PPSLT و MgO:PPLN JF - opsi JO - opsi VL - 24 IS - 0 UR - http://opsi.ir/article-1-1546-en.html Y1 - 2018 SP - 445 EP - 448 KW - Second Harmonic Generation KW - Quasi Phase Matching KW - Gaussian Beam KW - Thermal Distribution. N2 - In this paper, effects of thermal distribution on the efficiency of the second harmonic generation by a continuous laser with a wavelength of 1064 nm inside a MgO: PPLT crystal is investigated. The results of the numerical calculations show that for the incident power of above 30W the asymmetric thermal distribution along the crystal leads to the phase mismatch and significant reduction of the second harmonic efficiency. By comparing the obtained results for the distribution of temperature on the efficiency of the second harmonic inside the crystals of MgO: PPLT and MgO: PPLN for the high incident powers, it has been found that despite higher nonlinear coefficient of MgO: PPLN crystal, the efficiency of MgO: PPLT crystal is higher. M3 ER -