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使用8条激光二极管(LD)阵列对Nd:YAG晶体进行双侧泵浦,分析晶体的温度、应力和热致折射率的变化。研究不同泵浦条件下放大器的放大系数,并在此基础上,重点讨论了热效应对晶体寄生振荡的影响。实验结果表明,在高功率泵浦的条件下,由晶体热效应引起的晶体变形及热致折射率变化可以在一定程度上抑制晶体的寄生振荡。不管振荡器输出光是直线通过放大器还是在放大器晶体表面反射一次通过晶体,均能得到2倍的单程放大系数。
Nd: YAG crystals were bilaterally pumped using eight laser diode (LD) arrays to analyze crystal temperature, stress and thermal induced refractive index changes. The amplification factor of the amplifier under different pumping conditions is studied. On the basis of this, the influence of thermal effect on the crystal parasitic oscillation is discussed. The experimental results show that under the condition of high power pumping, the crystal deformation caused by the thermal effect of the crystal and the thermal refractive index change can restrain the parasitic oscillation of the crystal to a certain extent. Regardless of whether the oscillator output light is reflected linearly through the amplifier or the crystal surface of the amplifier, one-pass amplification can be obtained.