Automatically constructing an initial structure of athermal and achromatic optical systems based on particle swarm optimization

In the design process of athermal and achromatic optical systems, most designers rely on experience to select the initial structure and materials, which leads to relatively low design efficiency. This paper proposes a method for constructing an initial structure of athermal and achromatic optical systems based on particle swarm optimization (PSO). The method automatically selects lens materials and optimizes structural parameters. To validate its effectiveness, we designed an optical system with a wavelength range of 450-750 nm. The modulation transfer function (MTF) values exceed 0.42 at the Nyquist frequency of 45 lp/mm within a temperature range of -50^∘C to +70^∘C, with the MTF curves remaining nearly constant across the entire temperature range, thus meeting the application requirements.