The effects of structural parameter on the temperature distribution and conversion efficiency in the temperature control scheme of ADP squared crystal with large aperture

• A temperature control scheme of ADP squared crystal is proposed.
• The factors which influence the crystal temperature distribution are analyzed.
• The model of structural parameter is set up and studied by FVM and experiment.
• The optimal parameter diameter of the heating apparatus is put forward.
• The distributions of temperature and the 2ω–4ω conversion efficiency are studied.

In order to obtain the best conversion efficiency of the laser with large diameter under the Non-Critical Phase Matching (NCPM), a temperature control scheme of ADP squared crystal with large aperture is proposed. The factors which influence the crystal temperature distribution are analyzed firstly, and the structural parameter is considered to be one of the most important factors. Then, the model of structural parameter is set up and studied by the Finite Volume Method (FVM) and experiment. Finally, the optimal parameter diameter is put forward and the temperature distribution of the ADP squared crystal is obtained, which caused the 2ω–4ω conversion efficiency is also studied by the FVM and experiment.