The phase matching and effective nonlinear coefficients in three planes of BaGa4Se7 (BGSe) crystal are simulated, and the optimal design of phase matching planes and matching types is given. At the same time, the cavity length and pump intensity threshold of the OPO are analysed, and the partial optimization design of the OPO is given. The experimental platform of optical parametric oscillator is designed and built. The idle pulse energy of 2980 nm is 0.806 mJ, 4132 nm is 0.263 mJ, and 6118 nm is 0.084 mJ. The corresponding optical-optical conversion efficiencies are 7.8%, 2.5% and 1%, and the slope efficiencies are 9%, 2.8% and 1.4%, respectively.
In this paper, a phase-change-cooled active mirror amplifier with high thermal conductivity composites is presented to
meet the thermal management requirement and the payload limit of laser amplifiers in the space environment. And a
three-dimensional transient model of solid-liquid phase cooling is developed to predict the phase change process and the
thermal effects in the active mirror amplifier, in terms of temperature, thermal stress, thermal deformation and thermal-induced
wavefront distortion. The measured transient temperature distributions agree well with the results of the
transient model, which verify the accuracy of the model. We expect that this investigation will assist in the design and
optimization of the high energy, high average power lasers.
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