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非临界相位匹配条件下,为保证大口径倍频晶体具有较高的温度稳定性与一致性,在全口径范围内实现最优的倍频转换效率,设计了一种采用电加热方法进行高精度温度控制的装置。在装置设计中,充分考虑倍频晶体导热系数小、形状薄而大的特点,通过热传导加热倍频晶体,并同时加热装置其他部分,形成自然对流,均衡晶体温度。通过仿真和实验得到该装置温度分布的整体规律,得到在不同加热长度下,晶体稳定温度及稳定所需时长随晶体材料导热系数变化的规律。实验和仿真均表明:该装置能加热Φ80 mm口径的倍频晶体至目标温度,并将其温度一致性控制在±0.15°C范围内。
Under the condition of non-critical phase matching, in order to ensure the high temperature stability and consistency of the large-diameter double-frequency crystal, the optimal frequency-doubling conversion efficiency is achieved in the full aperture range, and a method of electric heating is designed to achieve high precision Temperature control device. In the device design, taking full account of the frequency-doubled crystal thermal conductivity is small, the shape of thin and large features, through the heat conduction frequency doubling crystals, while heating the rest of the device to form a natural convection, the equilibrium crystal temperature. Through the simulation and experiment, the overall law of the temperature distribution of the device is obtained, and the law of the thermal stability of the crystal and the change of the length of time required by the crystal with the thermal conductivity of the crystal material under different heating lengths are obtained. Experiments and simulations show that the device can heat the frequency doubling crystal of Φ80 mm diameter to the target temperature and keep its temperature uniformity within ± 0.15 ° C.