Research on a wavefront aberration calculation method for a laser energy gradient attenuator

Abstract

When a laser energy gradient attenuator is working, there is an inhomogeneous temperature distribution in the whole of the glass because of the non-uniform light energy absorption. This will lead to optical performance reduction. An integrated opto-thermal–mechanical method is proposed to calculate the wavefront aberration for analysis of the thermal effect of the system. Non-sequential optical analysis is used for computing the absorbed energy distribution. The finite element analysis program solves the temperature distribution and the deformations of nodes on the surfaces. An interface routine is created to fit the surface shape and the index field, and extended Zernike polynomials are introduced to get a higher fitting precision. Finally, the parameters are imported to the CodeV optical design program automatically, and the user defined gradient index material is ray traced to obtain the wavefront aberration. The method can also be used in other optical systems for thermal effect analysis.

A Review on Zernike Coefficient-Solving Algorithms (CSAs) Used for Integrated Optomechanical Analysis (IOA)

“…Compared with the traditional algorithm, the neural network algorithm exhibits good accuracy and stability; in this case, the number of Zernike polynomial terms and grid division is no longer restricted. In addition, the working environment of some optical instruments is complex and requires multiple IOAs according to different working conditions [83][84][85]. A neural network algorithm has higher computing speeds and is more suitable for the IOAs of such optical instruments.…”

Micromirror Array with Adjustable Reflection Characteristics Based on Different Microstructures and Its Application

“…Li Z et al [13] obtained antireflective transparent surfaces consisting of silica nanocaps by the simple heat treatment of silica-coated monolayer colloidal crystal templates, which provided an effective reduction in the reflectivity of the reflected light. Inspired by the moth eye, Yue gang Fu and team [14][15][16][17] prepared microstructural reflective surfaces of cylinder, cone, and circular hole shapes by using reactive ion etching to regulate the reflectivity of such surfaces through microstructures for anti-reflection effects, or through other bionic micro-nano structures to modulate the reflected light properties.…”