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In order to achieve high-homogeneity pumping source of semiconductor laser, the influence of microlens changes in the imaging beam integrator on the homogeneity of pumping light is researched. The relation between microlens numerical aperture and the divergence angle of the incident beam is discussed in detail. The far field distribution model of the Gaussian beam passing through the imaging beam integrator is established, in order to analyze the impact of the diffraction of microlens edge on the spot homogeneity. The upper and lower limits of clear aperture of microlens are confirmed to provide a range value for the optical design of the imaging beam integrator. Finally, the software simulation results with ZEMAX and experimental result are compared, showing that the spot of inhomogeneity 8.11% is achieved by the optimized imaging beam integrator.

By analyzing how aberrations affect the performance of a fly’s eye integrator, an efficient method to optimize the performance is put forward. A fly’s eye integrator to be used to homogenize the beam of laser diode stack is designed as an example. The optimization method achieves optimized homogeneous illumination by minimizing the aberrations that degrade the homogeneity and transmission efficiency. By this means, it is possible to substitute two spherical lenses for the Fourier lens, which is usually used in a conventional fly’s eye integrator. This helps to reduce the cost without degrading its performance.

The design scheme and structure of a high accuracy temperature-controlling thermal radiation source for thermographic inspection are presented, the performance parameters of temperature-controlling thermal radiation source is given.

For fine beam shaping, sampling method for simulated annealing is researched. It proves that it will induce energy leaking when sampling region is narrower than the Shannon period, and data redundancy when broader than the Shannon period. Suitable sampling region and interval for simulated annealing are suggested under that condition.