Heat deposition in large-aperture diode-end-pumped laser amplifier

By analysing the performance features of laser diode array end-pumped disk laser amplifier,a finite element thermal model of laser crystal Nd:YLF was established.3D and transient distributions of temperature and thermal stress of Nd:YLF pumped with 56kW,520μs and 10HzLD were respactively calculated when the transverse distribution of pump energies was uniform,Gaussian and Super-Gaussian.The result shows that the thermal effect of the crystal under Super-Gaussian transverse distribution is the weakest,the maxmum temperature is 103.3 ℃,and the maxmum Mises stress is 47.6 MPa.When the effective pump energy reaches up to 10 kW/cm~2,the fracture due to thermal stress will occur.